Type
Day
School
St. Sebastian's School
Siviq Rank#71Los Angeles, CA • Day
Day20 AP Courses
Enrollment
380
Student-Teacher Ratio
7:1
Admit Rate
-
Reach
Local / Regional
Narrative
Profile Notes
Summary
St. Sebastian's School is a Catholic independent day school for young men in grades 7-12 in Needham, Massachusetts. Using the school's 2024-2025 official profile as the cited source for 2025-2026 normalization, the profile reports 380 students, 65 teaching faculty, a 7:1 student-faculty ratio, average class size of 10, 20 AP courses, and 30% of students receiving financial aid.
Advanced Coursework
Most students do not take AP English until senior year; most students do not take AP science until senior year; starred courses are the equivalent of a first or second year college course.
Matriculation Notes
100% of the senior class attend a 4-year college
Siviq Layer
Siviq Scores
Siviq Scores
Precomputed percentiles relative to similar schools. These scores are descriptive rather than judgmental.
Academic Program
44th percentile
Higher reported academic program than 44% of similar schools.
Combines advanced-course offerings, testing, and reported honors or IB signals.
Average Class Size
93rd percentile
Lower reported average class size than 93% of similar schools.
Smaller reported average classes score higher within each peer cohort.
Outcomes
33rd percentile
Higher reported outcomes than 33% of similar schools.
Based on reported college destinations in the current school profile.
Reach & Access
79th percentile
Higher reported reach & access than 79% of similar schools.
Combines geographic reach and reported access signals from the current school data.
Student Experience
50th percentile
Lower reported student experience than 50% of similar schools.
Lower student-teacher ratios score higher within each peer cohort.
Standardized Data
Profile
Profile
Overview
- Grades Served
- 7-12
Profile
Academics
- AP Courses
- 20
Profile
Student Body
- Receiving Financial Aid
- 30%
Location Context
Nearest
Institutional Details
People & Credentials
Institutional
Leadership
Head of School
Brendan W. Sullivan
Institutional
Contacts
Director of College Counseling
Ellen B. Hinman
Assistant Director of College Counseling
Dean B. Adams
Assistant Director of College Counseling
Woody B. Redpath
Assistant to the Director of College Counseling
Patricia M. White
Institutional
School Codes
CEEB Code Number
221545
External References
Links
College Outcomes
Top Colleges
Search & Answers
St. Sebastian's School Frequently Asked Questions
What is the student-teacher ratio at St. Sebastian's School?
The current school profile reports a student-teacher ratio of 7:1 at St. Sebastian's School.
How many students are enrolled at St. Sebastian's School?
The current school profile reports about 380 students enrolled at St. Sebastian's School.
What grades does St. Sebastian's School offer?
St. Sebastian's School currently reports serving grades 7-12.
Is St. Sebastian's School a day school or a boarding school?
St. Sebastian's School is a private school.
Does St. Sebastian's School offer advanced placement (AP) courses?
Yes. The current school profile reports 20 AP courses at St. Sebastian's School.
How many students receive financial aid at St. Sebastian's School?
The current school profile says about 30.0% of students at St. Sebastian's School receive financial aid.
Which colleges show up most often for St. Sebastian's School?
The current school profile highlights Boston College as one of the top reported college destinations for St. Sebastian's School.
What do the starred courses mean at St. Sebastian's?
Starred courses are described as the equivalent of a first- or second-year college course. The profile also notes that most students do not take AP English or AP science until senior year.
How does financial aid work for families with demonstrated need?
St. Sebastian's says 100% of families with demonstrated need will receive financial aid. The profile also says 30% of students receive aid, with $4.7 million awarded.
What kinds of activities are available outside the classroom?
Students can choose from over 25 clubs and activities. The school also reports 6 student publications and 13 interscholastic sports.
Which colleges have recently enrolled the most St. Sebastian's graduates?
From the classes of 2020-2024, Boston College, Colby, College of the Holy Cross, Georgetown, Harvard, Providence, Notre Dame, and Villanova each enrolled ten or more graduates.
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 02, 2026 | AP Courses • Academic Rigor Category • Access Category • Advanced Course Notes • Average Class Size • Boarding Model • More normalized profile fields |
| 2025-2026 school profile PDF resources.finalsite.net/images/v1632152275/stsebs/fyeklvn7jqetzhvoejwl/SchoolProfile.pdf | Official Linked File | May 11, 2026 | Average Class Size • Faculty Count • Founded Year |
Sources & Data QualityMirrored artifacts, website inventory, and normalization review notes for this school profile.
Source Links
Known Website Addresses
| Role | URL | Method |
|---|---|---|
| official_website | saintsebastianschool.com/about/at-a-glance | supplemental_backfill |
| official_website | saintsebastianschool.com/about/facts | supplemental_backfill |
| official_website | saintsebastianschool.com/about/fast-facts | supplemental_backfill |
| official_website | saintsebastianschool.com/about/quick-facts | supplemental_backfill |
| official_website | saintsebastianschool.com/academics | supplemental_backfill |
| official_website | saintsebastianschool.com/academics/college-counseling | supplemental_backfill |
| official_website | saintsebastianschool.com/student-life | supplemental_backfill |
| official_website | saintsebastianschool.com/tuition-and-financial-aid | supplemental_backfill |
| Admissions, Apply & Financial Aid | St. Sebastian School | saintsebastianschool.com/admissions-apply-financial-aid | site_scan |
| 2025-2026 school profile PDF | resources.finalsite.net/images/v1632152275/stsebs/fyeklvn7jqetzhvoejwl/SchoolProfile.pdf | web_search |
| Private Coed Catholic School WLA FAQs | St. Sebastian School | saintsebastianschool.com/about | supplemental_backfill |
| Events Calendar, Volunteer & Support | St. Sebastian School | saintsebastianschool.com/community-news-calendar | supplemental_backfill |
| Events Calendar, Volunteer & Support | St. Sebastian School | saintsebastianschool.com/community-news-calendar/#" | supplemental_backfill |
| supplemental_file | saintsebastianschool.com/wp-content/uploads/2024/02/february-2024-lunch-menu.pdf | supplemental_backfill |
| Catholic School PreK - 8th West Los Angeles | St. Sebastian | saintsebastianschool.com | search |
All Canonical Metrics
| Metric | Value | Evidence |
|---|---|---|
| Grades Served | 7-12 | St. Sebastian’s is a Catholic independent day school for young men in grades seven through twelve. |
| Lowest Grade | 7 | 7-12 |
| Highest Grade | 12 | 7-12 |
| Postgraduate Offered | - | 7-12 |
| Boarding Status | Day | St. Sebastian’s is a Catholic independent day school for young men |
| Boarding Status Code | day | Day |
| School Type | Private | St. Sebastian’s is a Catholic independent day school for young men in grades seven through twelve. |
| School Type Code | private | Private |
| Enrollment | 380 | 380 students enrolled |
| Residential Enrollment | - | - |
| Day Enrollment | - | - |
| Student-Teacher Ratio | 7 | 7:1 student-faculty ratio |
| Founded Year | 1941 | Founded in 1941 |
| School Leadership | - | Brendan W. Sullivan — Head of School — [email protected] — 781-247-0111 |
| Key Contacts | - | Ellen B. Hinman — Director of College Counseling — [email protected] — 781-247-0119 |
| Accreditations | - | - |
| School Codes | - | CEEB Code Number: 221545 |
| AP Courses | 20 | 20 AP courses |
| Average Class Size | 10 | Average Class Size: 10 |
| IB Program | - | - |
| Honors Program | - | - |
| Advanced Course Notes | Most students do not take AP English until senior year; most students do not take AP science until senior year; starred courses are the equivalent of a first or second year college course. | (Most students do not take AP English until senior year.) ... (Most students do not take AP science until senior year.) ... *Course is the equivalent of a first or second year college course. |
| Faculty Count | 65 | AT A GLANCE • ... • 65 teaching faculty members • 7:1 student-faculty ratio |
| College Counseling Summary | - | - |
| Testing Policy | - | - |
| Testing Policy Code | - | - |
| Average SAT | - | - |
| Average ACT | - | - |
| Matriculation Summary | 100% of the senior class attend a 4-year college | 100% of the senior class attend a 4-year college |
| Top Colleges | - | Boston College ten or more graduates; Colby College ten or more graduates; College of the Holy Cross ten or more graduates; Georgetown University ten or more graduates; Harvard College ten or more graduates; Providence College ten or more graduates; University of Notre Dame ten or more graduates; Villanova University ten or more graduates; Clemson University five or more graduates; Fairfield University five or more graduates; Fordham University five or more graduates; Middlebury College five or more graduates; Northeastern University five or more graduates; Trinity College five or more graduates; Tufts University five or more graduates; University of Michigan five or more graduates; University of Wisconsin five or more graduates; Wake Forest University five or more graduates; American International College at least one graduate; Amherst College at least one graduate; Anna Maria College at least one graduate; Assumption University at least one graduate; Babson College at least one graduate; Bates College at least one graduate; Bentley University at least one graduate; Birmingham City University at least one graduate; Boston University at least one graduate; Bowdoin College at least one graduate; Brown University at least one graduate; Bucknell University at least one graduate; Catholic University of America at least one graduate; Clarkson University at least one graduate; Coastal Carolina University at least one graduate; Colgate University at least one graduate; Colorado College at least one graduate; Columbia College at least one graduate; Connecticut College at least one graduate; Cornell University at least one graduate; Dartmouth College at least one graduate; Dickinson College at least one graduate; Duke University at least one graduate; Emerson College at least one graduate; Emory University at least one graduate; Furman University at least one graduate; George Washington University at least one graduate; Gordon State College at least one graduate; Howard University at least one graduate; IE University at least one graduate; Indiana University at least one graduate; James Madison University at least one graduate; Johns Hopkins University at least one graduate; Lake Forest College at least one graduate; Lehigh University at least one graduate; Massachusetts College of Pharmacy and Health Sciences at least one graduate; Merrimack College at least one graduate; New York University at least one graduate; Northwestern University at least one graduate; Pitzer College at least one graduate; Princeton University at least one graduate; Rensselaer Polytechnic Institute at least one graduate; Saint Anselm College at least one graduate; Santa Clara University at least one graduate; Seton Hall University at least one graduate; Siena College at least one graduate; Skidmore College at least one graduate; Southern Methodist University at least one graduate; St. Lawrence University at least one graduate; Suffolk University at least one graduate; Syracuse University at least one graduate; Texas Christian University at least one graduate; The Ohio State University at least one graduate; Tulane University at least one graduate; Union College at least one graduate; United States Military Academy at least one graduate; University of California (Irvine) at least one graduate; University of California (Los Angeles) at least one graduate; University of Connecticut at least one graduate; University of Denver at least one graduate; University of Georgia at least one graduate; University of Hartford at least one graduate; University of Louisville at least one graduate; University of Maryland at least one graduate; University of Massachusetts (Amherst) at least one graduate; University of Massachusetts (Boston) at least one graduate; University of Miami at least one graduate; University of Pennsylvania at least one graduate; University of Richmond at least one graduate; University of Southern California at least one graduate; University of Vermont at least one graduate; University of Virginia at least one graduate; Vanderbilt University at least one graduate; Vassar College at least one graduate; Washington and Lee University at least one graduate; Washington University at least one graduate; Western Connecticut State University at least one graduate; Worcester Polytechnic Institute at least one graduate; Yale University at least one graduate |
| States Represented | - | - |
| Countries Represented | - | - |
| Students of Color | - | - |
| International Students | - | - |
| Receiving Financial Aid | 30 | 30% of students receive financial aid |
| Tuition-Free Share | - | - |
| Applicants | - | - |
| Admitted | - | - |
| Matriculated | - | - |
| Admit Rate | - | - |
| Yield Rate | - | - |
| Class Rank Policy | - | - |
| Class Rank Policy Code | - | - |
| Weighted Grades | - | - |
| Weighted Grades Policy | - | - |
| Disciplinary Reporting | - | - |
| Boarding Model | day_only | day_only |
| Selectivity Category | limited_evidence | limited_evidence |
| Academic Rigor Category | high | high |
| Testing Policy Category | not_reported | not_reported |
| College Counseling Category | established | established |
| Student Body Reach Category | regional | regional |
| Access Category | meaningful_access | meaningful_access |
| Outcome Category | strong_outcomes | strong_outcomes |
| Signals | - | Reported as a Catholic independent day school for young men in grades 7-12; 20 AP courses offered; Starred courses described as equivalent to a first- or second-year college course; Most common total AP courses taken is 5; 68 towns represented by the student body; 30% of students receive financial aid; School states 100% of families with demonstrated need will receive financial aid; $4.7M of aid awarded; College counseling office includes a director, two assistant directors, and an assistant to the director; 100% of the senior class attend a 4-year college; Five-year matriculation list includes multiple highly selective colleges, with several institutions enrolling ten or more graduates |