Type
Boarding and Day
School
Middlesex School
Siviq Rank#13Concord, MA • Boarding and Day
Boarding and Day24 AP Courses
Enrollment
427
Student-Teacher Ratio
4:1
Admit Rate
-
Reach
Global
Narrative
Profile Notes
Summary
Middlesex School is a nonsectarian, coeducational boarding/day preparatory school in Concord, Massachusetts, founded in 1901 and serving grades 9-12. The 2025-2026 profile reports 427 students, 67 teaching faculty, an average section size of 12, and a Class of 2025 matriculation list led by Northeastern University and the University of Chicago.
College Counseling
College counseling staff listed in the profile include a dean, a director, and an associate director.
Advanced Coursework
Highest-level coursework includes AP/AP-Level and advanced courses by department; courses marked with an asterisk are equivalent to a first- or second-year college course. Course levels include 400 AP/AP-Level and 500 College in High School/High Honors.
Matriculation Notes
The profile provides a Class of 2025 matriculation list; the largest reported destinations are Northeastern University and the University of Chicago with 6 students each.
Siviq Layer
Siviq Scores
Siviq Scores
Precomputed percentiles relative to similar schools. These scores are descriptive rather than judgmental.
Academic Program
81st percentile
Higher reported academic program than 81% of similar schools.
Combines advanced-course offerings, testing, and reported honors or IB signals.
Average Class Size
78th percentile
Lower reported average class size than 78% of similar schools.
Smaller reported average classes score higher within each peer cohort.
Institutional Resources
92nd percentile
Higher reported institutional resources than 92% of similar schools.
Uses linked nonprofit financial capacity when a reviewed EIN match is available.
Outcomes
60th percentile
Higher reported outcomes than 60% of similar schools.
Based on reported college destinations in the current school profile.
Reach & Access
17th percentile
Higher reported reach & access than 17% of similar schools.
Combines geographic reach and reported access signals from the current school data.
Student Experience
100th percentile
Lower reported student experience than 100% of similar schools.
Lower student-teacher ratios score higher within each peer cohort.
Standardized Data
Profile
Profile
Overview
- Grades Served
- 9-12
Profile
Academics
- AP Courses
- 24
- Honors Program
- Yes
- Average ACT
- 32
Profile
Student Body
- States Represented
- 23
- Countries Represented
- 21
Profile
Policies
- Class Rank Policy
- Neither a rank in class nor a cumulative average is computed.
- Weighted Grades
- No
- Weighted Grades Policy
- Full-credit courses are given equal weight in computing averages.
- Disciplinary Reporting
- Middlesex School values honesty; both the student and the college counselor will report suspensions to all colleges that ask.
Linked Nonprofit Data
Nonprofit Financials
Net Assets
$415,513,975
Tax year 2024
Net Income
$4,329,220
Latest revenue minus expenses from the school's nonprofit filing.
Total Expenses
$54,692,137
Tax year 2024
Expenses Per Student
$128,085
Calculated from total expenses divided by the current school-profile enrollment.
Location Context
Nearest
Institutional Details
People & Credentials
Institutional
Leadership
Head of School
Elizabeth C. Speers
Institutional
Contacts
Dean of College Counseling and Student Enrichment
Matthew J. DeGreeff
Director of College Counseling
Samuel F. Bigelow
Associate Director of College Counseling
Natalie Soule Martinez
Institutional
Accreditations
Accredited
New England Association of Colleges and Secondary Schools
Institutional
School Codes
CEEB Code
220650
External References
Links
College Outcomes
Top Colleges
Search & Answers
Middlesex School Frequently Asked Questions
What is the student-teacher ratio at Middlesex School?
The current school profile does not publish a normalized student-teacher ratio for Middlesex School.
How many students are enrolled at Middlesex School?
The current school profile reports about 427 students enrolled at Middlesex School.
What grades does Middlesex School offer?
Middlesex School currently reports serving grades 9-12.
Where is Middlesex School located?
Middlesex School is located in Concord, MA.
Is Middlesex School a day school or a boarding school?
Middlesex School is a private school.
Does Middlesex School offer advanced placement (AP) courses?
Yes. The current school profile reports 24 AP courses at Middlesex School.
Which colleges show up most often for Middlesex School?
The current school profile highlights Northeastern University as one of the top reported college destinations for Middlesex School.
Does Middlesex rank students or calculate a cumulative average?
No. The profile says Middlesex does not compute class rank or a cumulative average, and full-credit courses are weighted equally.
How often do students have classes at Middlesex?
Classes are held six days a week.
Can students or parents read the counselor recommendation letter?
No. Middlesex says neither students nor parents see counselor letters, to help keep them objective.
Which colleges drew the most Middlesex students from the Class of 2025?
The biggest reported destinations were Northeastern University and the University of Chicago, with 6 students each.
By Geography
Nearby Schools
By Similarity
Similar Schools
Provenance
Sources
| Source | Type | Checked | Metrics |
|---|---|---|---|
| 2025-2026 School Profile (PDF) Used for normalized profile metrics, school facts, FAQ answers, and school SEO metadata. | School Profile PDF | Apr 01, 2026 | AP Courses • Academic Rigor Category • Access Category • Accreditations • Advanced Course Notes • Average ACT • More normalized profile fields |
| 2025-2026 school profile PDF resources.finalsite.net/images/v1755195371/mxschooledu/llmyy5n3pqt5b2833l3h/MiddlesexSchoolProfile2025-26.pdf | Official Linked File | May 11, 2026 | Faculty Count |
| About - Middlesex School www.mxschool.edu/about | Official Website Page | May 11, 2026 | Grades Served |
| Mission & History - Middlesex School www.mxschool.edu/about/mission-history | Official Website Page | Apr 05, 2026 | Founded Year |
| Middlesex School | Independent 9-12 School in MA www.mxschool.edu | Official Website Page | Apr 05, 2026 | AP Courses • Average Class Size • Countries Represented • Enrollment • Student-Teacher Ratio |
Sources & Data QualityMirrored artifacts, website inventory, and normalization review notes for this school profile.
Source Links
Known Website Addresses
| Role | URL | Method |
|---|---|---|
| official_website | www.mxschool.edu/about/at-a-glance | supplemental_backfill |
| official_website | www.mxschool.edu/about/facts | supplemental_backfill |
| official_website | www.mxschool.edu/about/fast-facts | supplemental_backfill |
| official_website | www.mxschool.edu/about/quick-facts | supplemental_backfill |
| Academics - Middlesex School | www.mxschool.edu/academics | supplemental_backfill |
| official_website | www.mxschool.edu/academics/college-counseling | supplemental_backfill |
| official_website | www.mxschool.edu/admission | supplemental_backfill |
| Admissions - Middlesex School | www.mxschool.edu/admissions | supplemental_backfill |
| official_website | www.mxschool.edu/student-life | supplemental_backfill |
| official_website | www.mxschool.edu/tuition-and-financial-aid | supplemental_backfill |
| School Profile - Middlesex School | www.mxschool.edu/academics/college-office/school-profile | site_scan |
| 2025-2026 school profile PDF | resources.finalsite.net/images/v1755195371/mxschooledu/llmyy5n3pqt5b2833l3h/MiddlesexSchoolProfile2025-26.pdf | page_scan |
| About - Middlesex School | www.mxschool.edu/about | supplemental_backfill |
| Advising Program - Middlesex School | www.mxschool.edu/about/advising-program | supplemental_backfill |
| Careers - Middlesex School | www.mxschool.edu/about/careers | supplemental_backfill |
| Directory - Middlesex School | www.mxschool.edu/about/directory | supplemental_backfill |
| Middlesex School | Independent 9-12 School in MA | www.mxschool.edu | existing |
| Leadership - Middlesex School | www.mxschool.edu/about/leadership | supplemental_backfill |
| Mission & History - Middlesex School | www.mxschool.edu/about/mission-history | supplemental_backfill |
All Canonical Metrics
| Metric | Value | Evidence |
|---|---|---|
| Grades Served | 9-12 | grades 9-12 |
| Lowest Grade | 9 | 9-12 |
| Highest Grade | 12 | 9-12 |
| Postgraduate Offered | - | 9-12 |
| Boarding Status | Boarding and Day | Boarding students, who comprise approximately 70% of the student body, represent 23 states and 21 foreign countries. |
| Boarding Status Code | boarding_and_day | Boarding and Day |
| School Type | Nonsectarian, coeducational preparatory school | Middlesex School is a nonsectarian, coeducational preparatory school founded in 1901. |
| School Type Code | nonsectarian_coeducational_preparatory_school | Nonsectarian, coeducational preparatory school |
| Enrollment | 427 | The present enrollment is 427 with 206 females and 221 males in grades nine through twelve |
| Residential Enrollment | - | - |
| Day Enrollment | - | - |
| Student-Teacher Ratio | 4 | Our 4:1 student-faculty ratio ensures every Middlesex feels truly known and supported. |
| Founded Year | 1901 | founded in 1901 |
| School Leadership | - | Elizabeth C. Speers Head of School [email protected] (978) 291-6388 |
| Key Contacts | - | Matthew J. DeGreeff Dean of College Counseling and Student Enrichment [email protected] (978) 371-6533 |
| Accreditations | - | Accredited by the New England Association of Colleges and Secondary Schools. |
| School Codes | - | CEEB Code: 220650 |
| AP Courses | 24 | HIGHEST LEVEL COURSES BY DEPARTMENT ... Art: AP Art History, AP Music Theory, AP Studio Art; Classics: AP Latin (Vergil); Computer Science: ... AP Computer Science Principles ... AP Computer Science A; English: AP English Literature; Mathematics: ... AP Statistics ... AP Calculus AB ... AP Calculus BC; Modern Languages: AP Chinese Language, AP French Language, ... AP Spanish Language, AP Spanish Literature; Sciences: AP Biology, AP Chemistry, AP Environmental Science, AP Physics 1: Algebra-Based, AP Physics 2, AP Physics C; Social Sciences: ... AP American Government and Politics, AP Economics (micro and macro), AP European History, AP U.S. History |
| Average Class Size | 12 | 12 Students per class, on average. |
| IB Program | - | - |
| Honors Program | Yes | COURSE LEVELS 300 Honors/Advanced ... 500 College in High School/High Honors |
| Advanced Course Notes | Highest-level coursework includes AP/AP-Level and advanced courses by department; courses marked with an asterisk are equivalent to a first- or second-year college course. Course levels include 400 AP/AP-Level and 500 College in High School/High Honors. | HIGHEST LEVEL COURSES BY DEPARTMENT ... *Courses that are the equivalent of a first or second-year college course ... COURSE LEVELS ... 400 AP/AP-Level ... 500 College in High School/High Honors |
| Faculty Count | 67 | There are 67 teaching faculty, 81% of whom have graduate degrees. |
| College Counseling Summary | College counseling staff listed in the profile include a dean, a director, and an associate director. | Matthew J. DeGreeff Dean of College Counseling and Student Enrichment ... Samuel F. Bigelow Director of College Counseling ... Natalie Soule Martinez Associate Director of College Counseling |
| Testing Policy | - | - |
| Testing Policy Code | - | - |
| Average SAT | - | - |
| Average ACT | 32 | STANDARDIZED TESTING ... The standardized testing for the Class of 2025 for students who submitted test scores to the colleges. ... ACT (34 students) 32 33 29 - 34 |
| Matriculation Summary | The profile provides a Class of 2025 matriculation list; the largest reported destinations are Northeastern University and the University of Chicago with 6 students each. | THE CLASS OF 2025 WILL ATTEND THESE COLLEGES: Northeastern University (6) University of Chicago (6) ... |
| Top Colleges | - | Northeastern University 6; University of Chicago 6; Boston College 4; Brown University 4; Bucknell University 4; Colby College 4; University of St Andrews 4; Williams College 4; Harvard University 3; Wake Forest University 3; Wesleyan University 3; Babson College 2; Dartmouth College 2; Georgetown University 2; Haverford College 2; Middlebury College 2; Providence College 2; Purdue University 2; The New School 2; University of Michigan 2; University of Virginia 2; Bates College 1; Bentley University 1; Bowling Green State University 1; Case Western Reserve University 1; Colgate University 1; Connecticut College 1; Cornell University 1; Dickinson College 1; Fairfield University 1; Hamilton College 1; Hobart and William Smith Colleges 1; Johnson & Wales University 1; Lehigh University 1; Marymount Manhattan College 1; Northwestern University 1; Princeton University 1; Rice University 1; Rutgers University 1; Skidmore College 1; Syracuse University 1; The University of Tampa 1; Trinity College 1; Tufts University 1; Tulane University of Louisiana 1; Union College 1; Universidad de Navarra 1; University of Amsterdam 1; University of Massachusetts (Amherst) 1; University of Pennsylvania 1; University of Pittsburgh 1; University of Rochester 1; University of Southern California 1; Villanova University 1; Washington and Lee University 1; Washington University in St. Louis 1 |
| States Represented | 23 | Boarding students, who comprise approximately 70% of the student body, represent 23 states and 21 foreign countries. |
| Countries Represented | 21 | Boarding students, who comprise approximately 70% of the student body, represent 23 states and 21 foreign countries. |
| Students of Color | - | - |
| International Students | - | - |
| Receiving Financial Aid | - | - |
| Tuition-Free Share | - | - |
| Applicants | - | - |
| Admitted | - | - |
| Matriculated | - | - |
| Admit Rate | - | - |
| Yield Rate | - | - |
| Class Rank Policy | Neither a rank in class nor a cumulative average is computed. | Neither a rank in class nor a cumulative average is computed. |
| Class Rank Policy Code | - | Neither a rank in class nor a cumulative average is computed. |
| Weighted Grades | No | Full-credit courses are given equal weight in computing averages. |
| Weighted Grades Policy | Full-credit courses are given equal weight in computing averages. | Full-credit courses are given equal weight in computing averages. |
| Disciplinary Reporting | Middlesex School values honesty; both the student and the college counselor will report suspensions to all colleges that ask. | DISCIPLINARY REPORTING POLICY Middlesex School values honesty; both the student and the college counselor will report suspensions to all colleges that ask. |
| Boarding Model | boarding_and_day | boarding_and_day |
| Selectivity Category | selective | selective |
| Academic Rigor Category | very_high | very_high |
| Testing Policy Category | test_optional | test_optional |
| College Counseling Category | extensive | extensive |
| Student Body Reach Category | global | global |
| Access Category | limited_evidence | limited_evidence |
| Outcome Category | strong_outcomes | strong_outcomes |
| Signals | - | Boarding students comprise approximately 70% of the student body, indicating a boarding-and-day model.; Boarding students represent 23 states and 21 foreign countries.; Curriculum includes 24 AP courses plus 400 AP/AP-Level and 500 College in High School/High Honors levels; some courses are marked as equivalent to first- or second-year college work.; In 2025, 265 candidates sat for 714 AP exams; reported AP score distribution was 42% 5s and 34% 4s.; Reported testing for submitters was strong: SAT EBRW mean 720, SAT Math mean 710, and ACT mean 32 (median 33).; 27 of 102 students in the Class of 2025 did not submit any scores as part of their application process.; College counseling staffing includes a dean, director, and associate director.; School is a founding member of ACCIS and also a member of BISCCA, NACAC, NEACAC, and the College Board.; Profile provides a detailed Class of 2025 matriculation list including multiple enrollments at University of Chicago, Brown, Williams, Harvard, Dartmouth, and other highly selective colleges. |