Liabilities / Assets
39th percentile
Higher debt load relative to assets than 39% of similar nonprofits.
EIN 04-2103821 • 501(c)3 • Concord, MA
Linked School Profile
Profile
Middlesex school is an independent, non-denominational, residential, college-preparatory school that, for over one hundred years, has been committed to excellence in the intellectual, ethical, creative, and physical development of young people. (see schedule o)
Refreshing map…
Precomputed percentiles relative to similar nonprofits. These scores are descriptive rather than judgmental.
Liabilities / Assets
39th percentile
Higher debt load relative to assets than 39% of similar nonprofits.
Liabilities / Revenue
84th percentile
Higher debt load relative to revenue than 84% of similar nonprofits.
Net Margin
22nd percentile
Higher net margin than 22% of similar nonprofits.
Top Officer Pay
27th percentile
Higher top officer pay than 27% of similar nonprofits.
Top officer pay equals 1.0% of source-year revenue.
Asset Growth
32nd percentile
Faster asset growth than 32% of similar nonprofits.
Revenue Growth
66th percentile
Faster revenue growth than 66% of similar nonprofits.
Assets
Up$444,959,376
Up $10,671,220 (+2.5%) from 2023
Liabilities
Up$85,605,009
Up $4,999,560 (+6.2%) from 2023
Net Assets
Up$359,354,367
Up $5,671,660 (+1.6%) from 2023
Revenue
Up$48,448,306
Up $6,087,804 (+14%) from 2023
Expenses
Up$50,025,587
Up $2,997,023 (+6.4%) from 2023
Net Income
Up-$1,577,281
Up $3,090,781 (+66%) from 2023
Most recent year
2024 • Form 990Facts available. Structured filing facts are available, but richer extracted sections are limited.
Middlesex school helps students find their promise through rigorous intellectual, physical, creative, and ethical education. We value integrity, kindness, inclusivity, excellence, and engagement in service or our community and the wider world.
Middlesex school is a college-preparatory school for grades 9 through 12.
| Line | Beginning | End | Change |
|---|---|---|---|
| Assets | |||
| Investments Other Securities | $194,370,530 | $197,563,949 | ▲ $3,193,419 |
| Land, Buildings, and Equipment, Net | $101,030,852 | $99,727,267 | ▼ $1,303,585 |
| Pledges and Grants Receivable | $44,408,235 | $47,944,166 | ▲ $3,535,931 |
| Accounts Receivable | $12,141,171 | $15,857,999 | ▲ $3,716,828 |
| Investments in Publicly Traded Securities | $13,886,064 | $15,429,132 | ▲ $1,543,068 |
| Savings and Temporary Cash Investments | $9,497,232 | $4,304,191 | ▼ $5,193,041 |
| Prepaid Expenses and Deferred Charges | $2,978,844 | $3,071,846 | ▲ $93,002 |
| Cash and Non-Interest-Bearing Accounts | $1,696,395 | $1,785,042 | ▲ $88,647 |
| Inventories for Sale or Use | $38,266 | $45,569 | ▲ $7,303 |
| Total Assets | $434,288,156 | $444,959,376 | ▲ $10,671,220 |
| Other Assets Total | $54,240,567 | $59,230,215 | ▲ $4,989,648 |
| Liabilities | |||
| Other Liabilities | $38,721,490 | $41,589,503 | ▲ $2,868,013 |
| Deferred Revenue | $20,229,833 | $22,354,086 | ▲ $2,124,253 |
| Tax Exempt Bond Liabilities | $17,347,108 | $17,354,612 | ▲ $7,504 |
| Accounts Payable and Accrued Expenses | $4,307,018 | $4,306,808 | ▼ $210 |
| Total Liabilities | $80,605,449 | $85,605,009 | ▲ $4,999,560 |
| Net Assets / Fund Balance | |||
| Net Assets With Donor Restrictions | $245,568,217 | $251,227,960 | ▲ $5,659,743 |
| Net Assets Without Donor Restrictions | $108,114,490 | $108,126,407 | ▲ $11,917 |
| Total Net Assets Fund Balance | $353,682,707 | $359,354,367 | ▲ $5,671,660 |
| Total Liabilities and Net Assets / Fund Balance | $434,288,156 | $444,959,376 | ▲ $10,671,220 |
| Asset | Book Value | Depreciation | Basis |
|---|---|---|---|
| Buildings | $92,157,634 | $88,017,862 | $180,175,496 |
| Equipment | $893,433 | $9,002,559 | $9,895,992 |
| Other Land Buildings | $5,369,727 | - | $5,369,727 |
| Land | $1,306,473 | - | $1,306,473 |
| Other Assets Org | $369,714 | - | - |
| Other Securities | $5,850,081 | - | - |
| Period | Beginning | Contrib. | Gain/Loss | Other Uses | End |
|---|---|---|---|---|---|
| 2023 | $209,931,778 | $676,344 | ▲ $11,960,343 | $12,025,016 | $210,543,449 |
| 2022 | $220,472,785 | $3,654,559 | ▼ $2,784,866 | $11,410,700 | $209,931,778 |
| 2021 | $252,327,972 | $2,297,127 | ▼ $22,738,981 | $11,413,333 | $220,472,785 |
| 2020 | $179,678,110 | $1,605,192 | ▲ $80,114,546 | $9,069,876 | $252,327,972 |
| 2019 | $171,760,741 | $3,409,065 | ▲ $12,901,215 | $8,392,911 | $179,678,110 |
| Name | Title | Full / Part Time | Base | Other | Total |
|---|---|---|---|---|---|
| Karlyn Mcnall | Associate Head of School | FT | $350,483 | $150,510 | $500,993 |
| Elizabeth Speers | Head of School | FT | $294,645 | $100,215 | $394,860 |
| George Noble | Chief Advancement Officer | FT | $195,492 | $188,411 | $383,903 |
| Therese Cunningham | Chief Financial Officer | FT | $245,248 | $116,459 | $361,707 |
| Heather Parker | Chief Advancement Officer | FT | $202,529 | $63,385 | $265,914 |
| Michael Schaeberle | Director of Studies | FT | $114,234 | $137,769 | $252,003 |
| Matthew Degreeff Dean of | College Couns. & Student Enrichment | FT | $131,018 | $111,118 | $242,136 |
| Douglas Price | Dean of Admissions & Financial Aid | FT | $154,691 | $73,892 | $228,583 |
| Charles Mcdonald | Academic Tech. Spc. (until 6/30/23) | - | $42,676 | $183,382 | $226,058 |
| David Beare | Former Head of School | - | $198,919 | $198,919 | $198,919 |
| Kerry Magee | Director of Faculty Development | FT | $93,664 | $78,405 | $172,069 |
| Matthew Crozier | Former Chief Operating Officer | - | $96,817 | $44,735 | $141,552 |
| Name | Title |
|---|---|
| Jason Robart | President |
| Allen J Model | Vice President |
| Anne T Bass | Vice President |
| Robert M Bass | Vice President |
| Abigail Marr Doft | Trustee |
| Alexander C Banker | Trustee |
| Alexandra Hanken Russell | Trustee |
| Bret Stephens | Trustee |
| Caroline Counselman | Trustee |
| Cass Sunstein | Trustee |
| Charles Maddock | Trustee |
| Dr Courtney Portlock | Trustee |
| Edward F Mehm | Trustee |
| Freddie Pantoja | Trustee |
| J Benjamin Nye | Trustee |
| James F Curtis Iii | Trustee |
| Jasmine Richards | Trustee |
| Jennifer Burnes Fulton | Trustee |
| Johanna Boynton | Trustee |
| Joy Connolly | Trustee |
| Julia French Veghte | Trustee |
| Madeline Demoulas | Trustee |
| Mary Lou Boutwell | Trustee |
| Mary Pryshlak | Trustee |
| Patricia a Melton | Trustee |
| Robert C Trumbull | Trustee |
| Robert W Iuliano | Trustee |
| Samantha Du | Trustee |
| Stanoy S Tassev | Trustee |
| William J Ho | Trustee |
| Sarah C Leary | Secretary |
| Andrew Pitts | Treasurer |
| Contractor | Services | Location | Compensation |
|---|---|---|---|
| Flik | Food Service Contractor | PO BOX 417632, Boston, MA 02241 | $2,514,660 |
| Cbtchilds Bertman Tseckares INC | Architects And Construction Consulting | ONE CONSTITUTION RD STE 200, Boston, MA 02129 | $1,368,878 |
| Infranet Solutions INC | It Services | 2 BATTERYMARCH PARK, Quincy, MA 02169 | $549,374 |
| Wind River Environmental LLC | Waste Water Management | 245 PLYMOUTH STREET, Carver, MA 02330 | $522,403 |
| Weston & Sampson Services INC | Waste Water Plant Maintenance | 55 WALKERS BROOK DR STE 100, Reading, MA 01867 | $354,071 |
| Contribution Type | Contribution Count | Reported Amount | Valuation Method |
|---|---|---|---|
| Securities Publicly Traded | 31 | $285,810 | Fair Market Value (FMV) |
| Books and Publications | - | $300 | Fair Market Value (FMV) |
| Total Noncash Contributions | 31 | $286,110 | - |
| Line Item | Amount |
|---|---|
| Other Expenses | $22,256,789 |
| Salaries, Compensation, and Employee Benefits | $20,227,449 |
| Grants and Similar Amounts Paid | $7,541,349 |
| Total Fundraising Expense | $2,657,455 |
| Professional Fundraising Fees | $0 |
| Line Item | Program | Management | Fundraising | Total |
|---|---|---|---|---|
| Other Salaries and Wages | $8,435,237 | $3,409,989 | $974,285 | $12,819,511 |
| Grants to Domestic Individuals | $7,533,357 | - | - | $7,533,357 |
| Depreciation Depletion | $5,453,849 | $273,768 | $70,340 | $5,797,957 |
| Occupancy | $3,162,280 | $178,539 | $40,286 | $3,381,105 |
| Other Employee Benefits | $2,133,655 | $862,541 | $246,440 | $3,242,636 |
| Fees for Service Investment Mgmnt Fees | - | $2,526,206 | - | $2,526,206 |
| Current Officers, Directors, Trustees, and Key Employees | $1,360,246 | $549,887 | $157,110 | $2,067,243 |
| Fees for Services Other | $1,086,620 | $408,052 | $79,933 | $1,574,605 |
| Information Technology | $492,922 | $662,036 | $108,958 | $1,263,916 |
| Travel | $968,411 | $115,933 | $139,523 | $1,223,867 |
| Pension Plan Contributions | $736,416 | $297,700 | $85,057 | $1,119,173 |
| Payroll Taxes | $644,028 | $260,118 | $74,740 | $978,886 |
| All Other Expenses | $653,381 | $127,481 | $170,463 | $951,325 |
| Office Expenses | $302,419 | $185,609 | $64,849 | $552,877 |
| Interest | $463,835 | $23,283 | $5,982 | $493,100 |
| Insurance | $184,960 | $245,645 | $2,356 | $432,961 |
| Fees for Services Legal | $5,355 | $151,062 | $36,103 | $192,520 |
| Conferences and Meetings | $101,112 | $20,112 | $4,895 | $126,119 |
| Fees for Services Accounting | - | $114,043 | - | $114,043 |
| Other Expenses | $16,636 | $78,324 | $9,039 | $103,999 |
| Advertising | - | $84,753 | - | $84,753 |
| Grants to Domestic Orgs | $7,992 | - | - | $7,992 |
| Royalties | $2,468 | - | - | $2,468 |
| Fees for Services Lobbying | - | $2,156 | - | $2,156 |
| Total Functional Expenses | $36,581,344 | $10,786,788 | $2,657,455 | $50,025,587 |
| Line Item | Amount |
|---|---|
| Total Expenses per Form 990 | $50,025,587 |
| Total Expenses per Audited Statements | $40,385,966 |
| Expenses per Audited Statements | $40,170,008 |
| Expenses Not Reported on Financial Statements | $9,855,579 |
| Other Expense Adjustments | $7,338,255 |
| Expenses Not Reported on Form 990 | $215,958 |
| Region | Activity | Services | Offices | Employees | Spending |
|---|---|---|---|---|---|
| Central America and the Caribbean | Investments | - | - | - | $55,588,414 |
| East Asia and the Pacific | Investments | - | - | - | $6,951,961 |
| East Asia and the Pacific | School Sponsored Trip | - | 0 | 0 | $92,791 |
| Central America and the Caribbean | School Sponsored Trip | - | 0 | 0 | $60,817 |
| East Asia and the Pacific | Fundraising | - | 0 | 0 | $20,620 |
| Europe (including Iceland & Greenland) | School Sponsored Trip | - | 0 | 0 | $12,625 |
| Line Item | Amount |
|---|---|
| Fundraising Direct Expenses | $25,320 |
| Fundraising Gross Income | $17,250 |
| Professional Fundraising Fees | $0 |
| Event | Gross Receipts | Gross Revenue | Direct Expenses | Net Income |
|---|---|---|---|---|
| Kingman Cup | $25,275 | $17,250 | $573 | $16,677 |
| Total Events | $25,275 | $17,250 | $25,320 | $-8,070 |
| Liability | Amount |
|---|---|
| Liability on Charitable Remainder Trusts | $41,237,239 |
| Operating Lease Liability | $352,264 |
| Bond | Issuer | Issued | Issue Price | Purpose |
|---|---|---|---|---|
| A | Massachusetts Development Finance Agency | 2020-04-01 | $17,500,000 | Refinance outstanding series 2013 bonds and finance capital constructions |
| Bond | Total Proceeds | Spent | Retired | Issuance Costs |
|---|---|---|---|---|
| A | $17,500,000 | $17,500,000 | - | - |
“Robert m. Bass and anne t. Bass have a family relationship.”
“Once the draft form 990 is prepared, it is first reviewed by middlesex management, including the controller, chief financial officer, and the head of school. It is then distributed to the audit committee for their review. An audit committee meeting is then scheduled to discuss the return, any changes in the current year, or difficulties encountered, etc. After the audit committee reviews and discusses the draft and proposes changes, if needed, they will approve the form 990 as they discussed. After approval by the audit committee, and prior to filing, a copy of the form 990 without schedule b will be distributed to all board members electronically (or, where email is not available, a hard copy of the form is provided via mail) prior to the actual filing of the return.”
“Conflict of interest/governance questionnaires are distributed annually to all current voting board members, all trustee emeriti (non-voting), all former trustees that were voting board members within the last five years, all key-employees, and all former key-employees that left employment with the school at some point within the last 5 years. If forms are not completed, a second request is sent out. All forms are reviewed by the chair of our trustee and governance committee and a summary is reported to the audit committee. If conflicts exist, the conflicted member abstains from voting on any decisions made by their respective committees or the board. It is documented in the meeting minutes where the vote is concerned.”
“An independent committee of the board of trustees is charged with annually evaluating the job performance of the principal salaried officer (head of school). The president of the board appoints three to four individuals to serve on the compensation committee. The practice has been to appoint the president, treasurer, and chair/vice-chair of the trustees and governance committee. The committee is advised by outside counsel who attends the meetings, takes minutes, and advises the committee members of any legal issues or questions that arise in the process. The president of the board asks all trustees to complete evaluation forms at the spring board meeting. The president of the board also solicits oral comments from the trustees during an executive session at the spring board meeting as well as conducts, with other members of the compensation committee, 360 degree interviews with senior administrators. In preparation for the interview with the head of school in june, the completed trustee evaluation forms are summarized for the members of the compensation committee. The head of school also prepares a summary of accomplishment of the prior school year and statement of goals met from the previous review and established for the coming school year. After the interview with the head, the head is excused, and the committee (not including any member who may have a conflict of interest with respect to the compensation arrangement being reviewed) deliberates in executive session to discuss the performance review and to review a compilation of compensation and benefit data assembled on a blind basis by the association of business officers of preparatory schools in order to establish a basis for adjusting the head's compensation and benefits for the coming school year. After reaching a conclusion on adjustments for the compensation and benefit arrangements for the coming year that would represent compensation based on the committee's review of the comparability data, the head is invited to hear the results. The decisions are recorded in the minutes of the committee, and the changes in compensation (if any) are memorialized in a letter and where necessary in amendments to the employment contract. The results are reported to the full board in executive session (without the head present) at the fall board meeting. The new head of school had her first compensation committee review take place during the summer of 2024. Form 990, part vi, section b, line 15b: the compensation committee reviews the compensation for the cfo, coo, and chief advancement officers. The annual compensation process involves attention to and avoidance of conflicts of interest, use of comparability data gathered and presented by an outside compensation expert and contemporaneous documentation of the meetings, deliberations and decisions. All other individuals' rates are approved by the head of school. These processes were most recently undertaken in 2023.”
“Middlesex school provides governing documents, conflict of interest policy, financial statements, and form 990 without schedule b upon request for the same period of disclosure as set forth in section 6104(d).”
“Change in value of charitable remainder trusts 5,809,942.”
“We honor the ideal, articulated by our founding headmaster, of "finding the promise" in every student, and we work together in an atmosphere of mutual trust and shared responsibility to help students bring their talents to fruition as knowledgeable, capable, responsible and moral citizens of the world. As a community, we respect the individual interests, strengths, and needs of each student. We also value the rich diversity of belief and experience each of us brings to the school. We expect that each student will bring his or her best efforts to the shared endeavor of learning and that the school, through its faculty, will engage and encourage each student's growth, happiness, and well-being. We aspire for all middlesex students to develop personal integrity, intellectual vitality and discipline, and respect for themselves and for others. We expect each student to engage energetically and cooperatively in the life of the school, and we seek to inspire in all students the desire to seek understanding of themselves and the larger world, both now and in their futures. Operating principles - accomplishing this mission is the shared responsibility of the whole middlesex community. For that reason the school expects, of all its students, dedication to academic excellence, willingness to work energetically and cooperatively toward common goals in all activities, respect both for themselves and for the individual differences of others, and determination to reach beyond merely comfortable limits of knowledge and experience. In the same spirit the school provides students with small classes and a strong, rich, varied curriculum; with a talented, dedicated, and accessible faculty, most of whom teach, coach, and live on campus with the students; with outstanding facilities for academics, athletics, and the arts; and with a social community whose members represent different backgrounds and interests. Taken together, these elements - supplemented by advising, counseling, school assemblies and special programs, weekly chapel gatherings, informal courses and peer support groups: make up a secondary school experience remarkable for its breadth and depth.”
“From time to time, middlesex school may have several volunteers who participate in school-related committees and class events, such as prom, the middlesex parents association or alumni association. These volunteers include 37 board members and 68 parents committee members. Mpa: approximately 31 parents attend meetings and volunteer during the year. Alumni association: approximately 38 active alumni association volunteers.”
“The school meets annually with the trustees of reservations who administer the easements and tour the site.”
“Conservation easements on the middlesex campus are related to the protection/preservation of wetlands and the protection of resident wildlife on a portion of the middlesex property. Middlesex uses an environmental consulting firm annually to test the water quality of the wetlands on the middlesex campus where amphipods (salamanders) reside. The land is recorded as an asset on the balance sheet and the expenses related to the environmental consulting services are charged to facilities and operations.”
“The school maintains and preserves the following items that were donated to the school for display at the school's library: -flag of the 55th massachusetts volunteers of the civil war -sword of n.p. Hallowell, colonel of the 55th massachusetts volunteers of the civil war -works of art -rare collection of books”
“The school has adopted investment and spending policies for endowment assets that attempt to provide a predictable stream of funding to programs supported by its endowment while seeking to maintain the purchasing power of the endowment assets. Endowment assets include those assets of donor-restricted funds that the school must hold in perpetuity or for donor-specified purposes as well as board designated funds. The school expects its endowment funds, over time, to provide an average rate of return that will allow the purchasing power of the endowment to be maintained. Actual returns in any given year may vary from this amount. To satisfy its long-term rate-of-return objectives, the school relies on a total return strategy in which investment returns are achieved through both capital appreciation (realized and unrealized) and current yield (interest and dividends). The school targets a diversified asset allocation that places a greater emphasis on equity-based investments to achieve its long-term return objectives within prudent risk constraints. Under this policy, as approved by the board of trustees, the endowment assets are invested in a manner that is intended to produce results that exceed a policy index.”
“The school is qualified under section 501(c)(3) of the internal revenue code and is exempt from federal and state income taxes. The school is subject to federal and state income taxes on unrelated business income. The school follows fasb asc 740, income taxes, which clarifies the accounting for uncertainty in income taxes by prescribing the recognition threshold a tax position is required to meet before being recognized in the financial statements. The school recognizes a tax benefit from an uncertain tax position only if it is more likely than not that the tax position will be sustained on examination by taxing authorities. Management evaluated the school's tax positions and concluded that the school has no material uncertainties in income taxes. The school is generally exempt from income tax examinations by the u.s. Federal, state or local tax authorities for three years from the filing date.”
“Investment management fees netted with revenue on audited fs -2,517,324. Change in value of charitable remainder trusts 5,809,942. Financial aid netted with revenue on audited financial statements -7,338,255.”
“Costs of goods sold reported on form 990, part viii line 10b -128,245. Rental expenses reported on form 990, part viii, line 6b -62,393. Fundraising expenses reported on form 990, part viii, line 8b -25,320.”
“Costs of goods sold reported on form 990, line 10b 128,245. Rental expenses reported on form 990, part viii, line 6b 62,393. Fundraising expenses reported on form 990, part viii, line 8b 25,320.”
“Financial aid netted with revenue on audited financial statements 7,338,255.”
This appendix keeps the raw XML leaves available for debugging and edge-case review. The human report above is the primary experience.
| Path | # | Value |
|---|---|---|
| IRS990/AccountantCompileOrReviewInd | 0 | 0 |
| IRS990/AccountsPayableAccrExpnssGrp/BOYAmt | 0 | 4307018 |
| IRS990/AccountsPayableAccrExpnssGrp/EOYAmt | 0 | 4306808 |
| IRS990/AccountsReceivableGrp/BOYAmt | 0 | 12141171 |
| IRS990/AccountsReceivableGrp/EOYAmt | 0 | 15857999 |
| IRS990/ActivitiesConductedPrtshpInd | 0 | 0 |
| IRS990/ActivityOrMissionDesc | 0 | MIDDLESEX SCHOOL IS A COLLEGE-PREPARATORY SCHOOL FOR GRADES 9 THROUGH 12. |
| IRS990/AdvertisingGrp/ManagementAndGeneralAmt | 0 | 84753 |
| IRS990/AdvertisingGrp/TotalAmt | 0 | 84753 |
| IRS990/AllOtherContributionsAmt | 0 | 5454827 |
| IRS990/AllOtherExpensesGrp/FundraisingAmt | 0 | 170463 |
| IRS990/AllOtherExpensesGrp/ManagementAndGeneralAmt | 0 | 127481 |
| IRS990/AllOtherExpensesGrp/ProgramServicesAmt | 0 | 653381 |
| IRS990/AllOtherExpensesGrp/TotalAmt | 0 | 951325 |
| IRS990/AnnualDisclosureCoveredPrsnInd | 0 | 1 |
| IRS990/AuditCommitteeInd | 0 | 1 |
| IRS990/BackupWthldComplianceInd | 0 | 1 |
| IRS990/BooksInCareOfDetail/BusinessName/BusinessNameLine1Txt | 0 | THERESE A CUNNINGHAM CFO |
| IRS990/BooksInCareOfDetail/PhoneNum | 0 | 9783692550 |
| IRS990/BooksInCareOfDetail/USAddress/AddressLine1Txt | 0 | 1400 LOWELL ROAD |
| IRS990/BooksInCareOfDetail/USAddress/CityNm | 0 | CONCORD |
| IRS990/BooksInCareOfDetail/USAddress/StateAbbreviationCd | 0 | MA |
| IRS990/BooksInCareOfDetail/USAddress/ZIPCd | 0 | 01742 |
| IRS990/BusinessRlnWith35CtrlEntInd | 0 | 0 |
| IRS990/BusinessRlnWithFamMemInd | 0 | 0 |
| IRS990/BusinessRlnWithOrgMemInd | 0 | 0 |
| IRS990/CashNonInterestBearingGrp/BOYAmt | 0 | 1696395 |
| IRS990/CashNonInterestBearingGrp/EOYAmt | 0 | 1785042 |
| IRS990/ChangeToOrgDocumentsInd | 0 | 0 |
| IRS990/CntrctRcvdGreaterThan100KCnt | 0 | 18 |
| IRS990/CollectionsOfArtInd | 0 | 1 |
| IRS990/CompCurrentOfcrDirectorsGrp/FundraisingAmt | 0 | 157110 |
| IRS990/CompCurrentOfcrDirectorsGrp/ManagementAndGeneralAmt | 0 | 549887 |
| IRS990/CompCurrentOfcrDirectorsGrp/ProgramServicesAmt | 0 | 1360246 |
| IRS990/CompCurrentOfcrDirectorsGrp/TotalAmt | 0 | 2067243 |
| IRS990/CompensationFromOtherSrcsInd | 0 | 0 |
| IRS990/CompensationProcessCEOInd | 0 | 1 |
| IRS990/CompensationProcessOtherInd | 0 | 1 |
| IRS990/ConferencesMeetingsGrp/FundraisingAmt | 0 | 4895 |
| IRS990/ConferencesMeetingsGrp/ManagementAndGeneralAmt | 0 | 20112 |
| IRS990/ConferencesMeetingsGrp/ProgramServicesAmt | 0 | 101112 |
| IRS990/ConferencesMeetingsGrp/TotalAmt | 0 | 126119 |
| IRS990/ConflictOfInterestPolicyInd | 0 | 1 |
| IRS990/ConservationEasementsInd | 0 | 1 |
| IRS990/ConsolidatedAuditFinclStmtInd | 0 | 0 |
| IRS990/ContractorCompensationGrp/CompensationAmt | 0 | 2514660 |
| IRS990/ContractorCompensationGrp/CompensationAmt | 1 | 1368878 |
| IRS990/ContractorCompensationGrp/CompensationAmt | 2 | 549374 |
| IRS990/ContractorCompensationGrp/CompensationAmt | 3 | 522403 |
| IRS990/ContractorCompensationGrp/CompensationAmt | 4 | 354071 |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/AddressLine1Txt | 0 | PO BOX 417632 |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/AddressLine1Txt | 1 | ONE CONSTITUTION RD STE 200 |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/AddressLine1Txt | 2 | 2 BATTERYMARCH PARK |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/AddressLine1Txt | 3 | 245 PLYMOUTH STREET |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/AddressLine1Txt | 4 | 55 WALKERS BROOK DR STE 100 |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/CityNm | 0 | BOSTON |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/CityNm | 1 | BOSTON |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/CityNm | 2 | QUINCY |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/CityNm | 3 | CARVER |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/CityNm | 4 | READING |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/StateAbbreviationCd | 0 | MA |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/StateAbbreviationCd | 1 | MA |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/StateAbbreviationCd | 2 | MA |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/StateAbbreviationCd | 3 | MA |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/StateAbbreviationCd | 4 | MA |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/ZIPCd | 0 | 02241 |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/ZIPCd | 1 | 02129 |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/ZIPCd | 2 | 02169 |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/ZIPCd | 3 | 02330 |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/ZIPCd | 4 | 01867 |
| IRS990/ContractorCompensationGrp/ContractorName/BusinessName/BusinessNameLine1Txt | 0 | FLIK |
| IRS990/ContractorCompensationGrp/ContractorName/BusinessName/BusinessNameLine1Txt | 1 | CBTCHILDS BERTMAN TSECKARES INC |
| IRS990/ContractorCompensationGrp/ContractorName/BusinessName/BusinessNameLine1Txt | 2 | INFRANET SOLUTIONS INC |
| IRS990/ContractorCompensationGrp/ContractorName/BusinessName/BusinessNameLine1Txt | 3 | WIND RIVER ENVIRONMENTAL LLC |
| IRS990/ContractorCompensationGrp/ContractorName/BusinessName/BusinessNameLine1Txt | 4 | WESTON & SAMPSON SERVICES INC |
| IRS990/ContractorCompensationGrp/ServicesDesc | 0 | FOOD SERVICE CONTRACTOR |
| IRS990/ContractorCompensationGrp/ServicesDesc | 1 | ARCHITECTS AND CONSTRUCTION CONSULTING |
| IRS990/ContractorCompensationGrp/ServicesDesc | 2 | IT SERVICES |
| IRS990/ContractorCompensationGrp/ServicesDesc | 3 | WASTE WATER MANAGEMENT |
| IRS990/ContractorCompensationGrp/ServicesDesc | 4 | WASTE WATER PLANT MAINTENANCE |
| IRS990/ContriRptFundraisingEventAmt | 0 | 8025 |
| IRS990/CostOfGoodsSoldAmt | 0 | 128245 |
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| IRS990/CYOtherRevenueAmt | 0 | 1015318 |
| IRS990/CYProgramServiceRevenueAmt | 0 | 28396115 |
| IRS990/CYRevenuesLessExpensesAmt | 0 | -1577281 |
| IRS990/CYSalariesCompEmpBnftPaidAmt | 0 | 20227449 |
| IRS990/CYTotalExpensesAmt | 0 | 50025587 |
| IRS990/CYTotalFundraisingExpenseAmt | 0 | 2657455 |
| IRS990/CYTotalProfFndrsngExpnsAmt | 0 | 0 |
| IRS990/CYTotalRevenueAmt | 0 | 48448306 |
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| IRS990/DeferredRevenueGrp/BOYAmt | 0 | 20229833 |
| IRS990/DeferredRevenueGrp/EOYAmt | 0 | 22354086 |
| IRS990/DelegationOfMgmtDutiesInd | 0 | 0 |
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| IRS990/DepreciationDepletionGrp/ManagementAndGeneralAmt | 0 | 273768 |
| IRS990/DepreciationDepletionGrp/ProgramServicesAmt | 0 | 5453849 |
| IRS990/DepreciationDepletionGrp/TotalAmt | 0 | 5797957 |
| IRS990/Desc | 0 | MIDDLESEX SCHOOL IS A NON-SECTARIAN COLLEGE PREPARATORY BOARDING AND DAY SCHOOL FOR BOYS AND GIRLS IN GRADES 9-12. MIDDLESEX HAS ALWAYS PRIDED ITSELF IN ATTRACTING A DIVERSE, HIGHLY MOTIVATED GROUP OF STUDENTS FROM ACROSS THE COUNTRY AND MORE RECENTLY THE WORLD. CURRENT ENROLLMENT IS ABOUT 400 STUDENTS FROM MANY STATES AND COUNTRIES. FOUNDED IN 1901, THE SCHOOL HAS A LONG TRADITION OF PLACING STUDENTS IN THE MOST SELECTIVE COLLEGES. MIDDLESEX OFFERS A CHALLENGING ACADEMIC PROGRAM. IN ADDITION TO ITS SCHOOL YEAR PROGRAM, MIDDLESEX MAKES USE OF ITS CAMPUS FACILITIES FOR SUMMER AUXILIARY PROGRAMS CONSISTENT WITH ITS PRIMARY MISSION. |
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| IRS990/DocumentRetentionPolicyInd | 0 | 1 |
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| IRS990/DonorRestrictionNetAssetsGrp/EOYAmt | 0 | 251227960 |
| IRS990/DonorRstrOrQuasiEndowmentsInd | 0 | 1 |
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| IRS990/EmploymentTaxReturnsFiledInd | 0 | 1 |
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| IRS990/EscrowAccountInd | 0 | 0 |
| IRS990/ExpenseAmt | 0 | 36581344 |
| IRS990/FamilyOrBusinessRlnInd | 0 | 1 |
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| IRS990/FeesForServicesLegalGrp/ManagementAndGeneralAmt | 0 | 151062 |
| IRS990/FeesForServicesLegalGrp/ProgramServicesAmt | 0 | 5355 |
| IRS990/FeesForServicesLegalGrp/TotalAmt | 0 | 192520 |
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| IRS990/FeesForSrvcInvstMgmntFeesGrp/TotalAmt | 0 | 2526206 |
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| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 40 | 60.00 |
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| IRS990/Form990PartVIISectionAGrp/HighestCompensatedEmployeeInd | 4 | X |
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| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 3 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 4 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 5 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 6 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 7 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 8 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 9 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 10 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 11 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 12 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 13 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 14 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 15 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 16 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 17 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 18 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 19 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 20 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 21 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 22 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 23 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 24 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 25 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 26 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 27 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 28 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 29 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 30 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 31 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 32 | X |
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| IRS990/Form990PartVIISectionAGrp/OfficerInd | 2 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 3 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 4 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 5 | X |
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| IRS990/Form990PartVIISectionAGrp/OfficerInd | 8 | X |
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| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 14 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 15 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 16 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 17 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 18 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 19 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 20 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 21 | 0 |
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| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 23 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 24 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 25 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 26 | 0 |
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| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 34 | 91390 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 35 | 148342 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 36 | 23256 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 37 | 53694 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 38 | 80989 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 39 | 23382 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 40 | 107700 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 41 | 28360 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 42 | 33967 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 43 | 0 |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 0 | ELIZABETH SPEERS |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 1 | ALEXANDER C BANKER |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 2 | MARY LOU BOUTWELL |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 3 | JOHANNA BOYNTON |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 4 | JOY CONNOLLY |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 5 | CAROLINE COUNSELMAN |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 6 | JAMES F CURTIS III |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 7 | MADELINE DEMOULAS |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 8 | ABIGAIL MARR DOFT |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 9 | SAMANTHA DU |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 10 | JENNIFER BURNES FULTON |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 11 | WILLIAM J HO |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 12 | ROBERT W IULIANO |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 13 | CHARLES MADDOCK |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 14 | EDWARD F MEHM |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 15 | PATRICIA A MELTON |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 16 | J BENJAMIN NYE |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 17 | FREDDIE PANTOJA |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 18 | DR COURTNEY PORTLOCK |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 19 | MARY PRYSHLAK |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 20 | JASMINE RICHARDS |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 21 | ALEXANDRA HANKEN RUSSELL |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 22 | BRET STEPHENS |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 23 | CASS SUNSTEIN |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 24 | STANOY S TASSEV |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 25 | ROBERT C TRUMBULL |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 26 | JULIA FRENCH VEGHTE |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 27 | JASON ROBART |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 28 | ANNE T BASS |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 29 | ROBERT M BASS |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 30 | ALLEN J MODEL |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 31 | SARAH C LEARY |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 32 | ANDREW PITTS |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 33 | KARLYN MCNALL |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 34 | THERESE CUNNINGHAM |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 35 | GEORGE NOBLE |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 36 | HEATHER PARKER |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 37 | DOUGLAS PRICE |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 38 | MATTHEW DEGREEFF DEAN OF |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 39 | CHARLES MCDONALD |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 40 | MICHAEL SCHAEBERLE |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 41 | KERRY MAGEE |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 42 | MATTHEW CROZIER |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 43 | DAVID BEARE |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 0 | 336172 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 1 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 2 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 3 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 4 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 5 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 6 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 7 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 8 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 9 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 10 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 11 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 12 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 13 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 14 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 15 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 16 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 17 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 18 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 19 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 20 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 21 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 22 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 23 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 24 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 25 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 26 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 27 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 28 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 29 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 30 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 31 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 32 | 0 |
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