Type
Day
School
Portledge School
Siviq Rank#69Day
Day13 AP CoursesIB Program
Enrollment
526
Student-Teacher Ratio
6:1
Admit Rate
-
Reach
Global
Narrative
Profile Notes
Summary
Source PDF is Portledge School's College Profile Class of 2019, with most institutional metrics explicitly described for the 2018-2019 academic year; the PDF does not provide 2025-2026 data. Extracted values below are limited to what this PDF supports.
College Counseling
Typically, 100% of the senior class attends 4-year colleges.
Advanced Coursework
Portledge offers Advanced Placement and International Baccalaureate Diploma Programme courses; students may also earn Music, STEAM, and/or Arts Scholar distinctions at graduation.
Matriculation Notes
Students from the Classes of 2014-2018 are attending the listed colleges and universities.
Siviq Layer
Siviq Scores
Siviq Scores
Precomputed percentiles relative to similar schools. These scores are descriptive rather than judgmental.
Academic Program
19th percentile
Higher reported academic program than 19% of similar schools.
Combines advanced-course offerings, testing, and reported honors or IB signals.
Institutional Resources
22nd percentile
Higher reported institutional resources than 22% of similar schools.
Uses linked nonprofit financial capacity when a reviewed EIN match is available.
Outcomes
39th percentile
Higher reported outcomes than 39% of similar schools.
Based on reported college destinations in the current school profile.
Reach & Access
89th percentile
Higher reported reach & access than 89% of similar schools.
Combines geographic reach and reported access signals from the current school data.
Student Experience
67th percentile
Lower reported student experience than 67% of similar schools.
Lower student-teacher ratios score higher within each peer cohort.
Standardized Data
Profile
Profile
Overview
- Grades Served
- pre-nursery through twelfth grade
- Day Enrollment
- 526
Profile
Admissions
- Applicants
- 12
Profile
Academics
- AP Courses
- 13
- IB Program
- Yes
- Average SAT
- 1,358
- Average ACT
- 28
Profile
Student Body
- Receiving Financial Aid
- 25%
Profile
Policies
- Class Rank Policy
- Portledge does not compute rank in class.
- Weighted Grades
- No
- Weighted Grades Policy
- Portledge calculates an unweighted GPA on a 4.0 scale based on end-of-year marks at Portledge in 9th, 10th, and 11th grades; grades from previous schools, online courses, or summer make-up work are not factored into GPA.
Linked Nonprofit Data
Nonprofit Financials
Net Assets
$22,767,444
Tax year 2024
Net Income
$345,344
Latest revenue minus expenses from the school's nonprofit filing.
Total Expenses
$27,307,068
Tax year 2024
Expenses Per Student
$51,915
Calculated from total expenses divided by the current school-profile enrollment.
Location Context
Nearest
Institutional Details
People & Credentials
Institutional
Leadership
Head of School
Simon Owen-Williams
Director of Upper School
Harry Grzelewski
Institutional
Contacts
Director of College Counseling
Karen M. Crowley
Assistant Director of College Counseling
Daniel Naftalis
Assistant Director of College Counseling
Shoshana Krieger-Joven
College Counseling Support
Jane Zisa
General school contact
School Contact
355 Duck Pond Road, Locust Valley, NY 11560; fax (516) 750-3103; website www.portledge.org
Institutional
Accreditations
chartered and registered
New York State Board of Regents
accredited
New York State Association of Independent Schools
NYSAIS
Institutional
School Codes
School Code
332883
Printed as 332 883
External References
Links
College Outcomes
Top Colleges
Search & Answers
Portledge School Frequently Asked Questions
What is the student-teacher ratio at Portledge School?
The current school profile reports a student-teacher ratio of 6:1 at Portledge School.
How many students are enrolled at Portledge School?
The current school profile reports about 526 students enrolled at Portledge School.
What grades does Portledge School offer?
Portledge School currently reports serving grades pre-nursery through twelfth grade.
Is Portledge School a day school or a boarding school?
Portledge School is a private school.
Does Portledge School offer advanced placement (AP) courses?
Yes. The current school profile reports 13 AP courses at Portledge School.
How many students receive financial aid at Portledge School?
The current school profile says about 25.0% of students at Portledge School receive financial aid.
Which colleges show up most often for Portledge School?
The current school profile highlights New York University as one of the top reported college destinations for Portledge School.
Does Portledge offer the full IB Diploma Programme?
Yes. Portledge is an IB World School and offers the International Baccalaureate Diploma Programme. In the Class of 2019, eight students were pursuing the full IB Diploma.
Can Portledge students earn special graduation distinctions?
Yes. Students with a special emphasis in music, STEAM, performing arts, or visual arts may earn Music, STEAM, and/or Arts Scholar distinctions at graduation.
Does Portledge rank students?
No. Portledge does not compute class rank. It calculates an unweighted GPA on a 4.0 scale using end-of-year Portledge marks from 9th, 10th, and 11th grades.
How common is financial aid at Portledge?
Financial aid is awarded to approximately 25% of Portledge students, according to the supplied school profile.
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. Official source: bbk12e1-cdn.myschoolcdn.com/ftpimages/894/misc/misc_167618.pdf | School Profile PDF | May 11, 2026 | AP Courses • Academic Rigor Category • Access Category • Accreditations • Advanced Course Notes • Applicants • More normalized profile fields |
| Admissions At Portledge School | Locust Valley, NY www.portledge.org/admissions | Official Website Page | May 12, 2026 | Applicants • Grades Served • IB Program |
| Inquire | Portledge School | Locust Valley, NY www.portledge.org/admissions/inquire | Official Website Page | May 12, 2026 | IB Program |
| International Admissions At Portledge School www.portledge.org/admissions/international-students | Official Website Page | May 12, 2026 | IB Program |
| Tuition, Financial Aid & Scholarships www.portledge.org/admissions/tuition-and-financial-assistance | Official Website Page | May 12, 2026 | Grades Served • IB Program |
| Visit Portledge www.portledge.org/admissions/visit-portledge | Official Website Page | May 12, 2026 | IB Program |
| College Counseling | Locust Valley, NY www.portledge.org/academics/college-counseling | Official Profile Page | Apr 06, 2026 | IB Program |
| Portledge School | Pre-Nursery - Grade 12 | Locust Valley, NY www.portledge.org | Official Website Page | Apr 06, 2026 | Founded Year • IB Program |
Sources & Data QualityMirrored artifacts, website inventory, and normalization review notes for this school profile.
Source Links
Known Website Addresses
| Role | URL | Method |
|---|---|---|
| Portledge School | Pre-nursery - Grade 12 | Locust Valley, NY | mainsitearchived-portledge.onmessagestaging.com | supplemental_backfill |
| official_website | www.portledge.org/about/at-a-glance | supplemental_backfill |
| official_website | www.portledge.org/about/facts | supplemental_backfill |
| official_website | www.portledge.org/about/fast-facts | supplemental_backfill |
| official_website | www.portledge.org/about/quick-facts | supplemental_backfill |
| Portledge Educational Preparation Programs | www.portledge.org/academics | supplemental_backfill |
| official_website | www.portledge.org/admission | supplemental_backfill |
| official_website | www.portledge.org/tuition-and-financial-aid | supplemental_backfill |
| School profile page | www.portledge.org/academics/college-counseling | existing |
| 2025-2026 school profile PDF | bbk12e1-cdn.myschoolcdn.com/ftpimages/894/misc/misc_167618.pdf | web_search |
| Admissions At Portledge School | Locust Valley, NY | www.portledge.org/admissions | supplemental_backfill |
| Inquire | Portledge School | Locust Valley, NY | www.portledge.org/admissions/inquire | supplemental_backfill |
| International Admissions At Portledge School | www.portledge.org/admissions/international-students | supplemental_backfill |
| Tuition, Financial Aid & Scholarships | www.portledge.org/admissions/tuition-and-financial-assistance | supplemental_backfill |
| Visit Portledge | www.portledge.org/admissions/visit-portledge | supplemental_backfill |
| Official website | www.portledge.org | existing |
| 2025-2026 school profile PDF | media.d3.nhle.com/image/private/t_document/prd/dgddneyuzh41rb9vq9a0.pdf | web_search |
All Canonical Metrics
| Metric | Value | Evidence |
|---|---|---|
| Grades Served | pre-nursery through twelfth grade | Portledge School is an independent, pre-nursery through twelfth grade preparatory day school. |
| Lowest Grade | - | pre-nursery through twelfth grade |
| Highest Grade | - | pre-nursery through twelfth grade |
| Postgraduate Offered | - | pre-nursery through twelfth grade |
| Boarding Status | Day | Portledge School is an independent, pre-nursery through twelfth grade preparatory day school. |
| Boarding Status Code | day | Day |
| School Type | Private | Portledge School is an independent, pre-nursery through twelfth grade preparatory day school. |
| School Type Code | private | Private |
| Enrollment | 526 | For the 2018-2019 academic year: Portledge enters its third year as an IB World School, enrolling 526 students, including 249 in the Upper School. |
| Residential Enrollment | - | - |
| Day Enrollment | 526 | Portledge School is an independent, pre-nursery through twelfth grade preparatory day school. For the 2018-2019 academic year: ... enrolling 526 students. |
| Student-Teacher Ratio | 6 | 41 Upper School faculty members, 77% of whom have advanced degrees, the student to faculty ratio is 6:1. |
| Founded Year | 1965 | founded 1965 |
| School Leadership | - | Simon Owen-Williams, Head of School. |
| Key Contacts | - | College Counseling Department: Karen M. Crowley, Director of College Counseling, [email protected]. |
| Accreditations | - | Portledge School is chartered and registered by the New York State Board of Regents. |
| School Codes | - | School Code: 332 883. |
| AP Courses | 13 | Courses Offered During the 2018-2019 Academic Year list AP Literature; AP Biology; AP Chemistry; AP Physics C; AP United States History; AP US Govt & Politics; AP Psychology; AP Statistics; AP Calculus AB; AP Calculus BC; AP French; AP Spanish; Mandarin ... AP. |
| Average Class Size | - | - |
| IB Program | Yes | As the only independent school on Long Island to offer the International Baccalaureate Diploma Programme, Portledge awarded its first IB diplomas in July 2018. |
| Honors Program | - | - |
| Advanced Course Notes | Portledge offers Advanced Placement and International Baccalaureate Diploma Programme courses; students may also earn Music, STEAM, and/or Arts Scholar distinctions at graduation. | The school’s coordinated sequential programs... through to Advanced Placement and International Baccalaureate Diploma Programme... Students who pursue a curriculum with a special emphasis on music, STEAM, performing or visual arts, may earn Music, STEAM, and/or Arts Scholar distinctions at graduation. |
| Faculty Count | - | - |
| College Counseling Summary | Typically, 100% of the senior class attends 4-year colleges. | Typically, 100% of the senior class attends 4-year colleges. |
| Testing Policy | - | - |
| Testing Policy Code | - | - |
| Average SAT | 1358 | The average combined SAT score (taken by 9 juniors as of June 2018) is 1358. |
| Average ACT | 28 | The average ACT composite test score (taken by 42 juniors as of June 2018) is 28. |
| Matriculation Summary | Students from the Classes of 2014-2018 are attending the listed colleges and universities. | College Matriculation: Students from the Classes of 2014 -2018 are attending the following colleges and universities. |
| Top Colleges | - | New York University 10; Syracuse University 10; Trinity College 7; Bentley University 6; The George Washington University 6; Hobart and William Smith Colleges 5; Hofstra University 5; Rochester Institute of Technology 5; Barnard College 4; Cornell University 4; Emory University 4; Fairfield University 4; Fordham University 4; High Point University 4; University of Miami 4; University of Michigan 4; Tulane University 4; Wesleyan University 4; Boston University 3; College of Charleston 3; Lehigh University 3; Lynn University 3; Northwestern University 3; Providence College 3; Quinnipiac University 3; Tufts University 3; University of Tampa 3; University of Virginia 3; Wake Forest University 3 |
| States Represented | - | - |
| Countries Represented | - | - |
| Students of Color | - | - |
| International Students | - | - |
| Receiving Financial Aid | 25 | Financial aid is awarded to approximately 25% of the students. |
| Tuition-Free Share | - | - |
| Applicants | 12 | 12 Applicants |
| Admitted | - | - |
| Matriculated | - | - |
| Admit Rate | - | - |
| Yield Rate | - | - |
| Class Rank Policy | Portledge does not compute rank in class. | Portledge does not compute rank in class, but does calculate an unweighted GPA on a 4.0 scale based on end-of-year marks at Portledge in 9th, 10th, and 11th grades. |
| Class Rank Policy Code | - | Portledge does not compute rank in class. |
| Weighted Grades | No | Portledge does not compute rank in class, but does calculate an unweighted GPA on a 4.0 scale based on end-of-year marks at Portledge in 9th, 10th, and 11th grades. |
| Weighted Grades Policy | Portledge calculates an unweighted GPA on a 4.0 scale based on end-of-year marks at Portledge in 9th, 10th, and 11th grades; grades from previous schools, online courses, or summer make-up work are not factored into GPA. | Portledge does not compute rank in class, but does calculate an unweighted GPA on a 4.0 scale based on end-of-year marks at Portledge in 9th, 10th, and 11th grades. Grades from previous schools, online courses, or from summer make-up work are not factored into the GPA. |
| 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 | extensive | extensive |
| Student Body Reach Category | global | global |
| Access Category | meaningful_access | meaningful_access |
| Outcome Category | strong_outcomes | strong_outcomes |
| Signals | - | Profile evidence is from Portledge School College Profile Class of 2019 / 2018-2019 metrics; supplied evidence does not provide 2025-2026 figures.; Boarding status is explicitly reported as an independent preparatory day school.; No applicant, admit, matriculated, admit-rate, or yield data are reported; selectivity cannot be reliably inferred from admission pressure.; Academic program includes 13 AP-designated courses and the International Baccalaureate Diploma Programme.; AP/IB participation reported: 74 Upper School students took 173 AP exams in 17 subjects; 18 students took 50 IB exams in 11 subject classifications; 8 Class of 2019 students pursued the full IB Diploma.; Score context is solid but mixed: average ACT 28 from 42 juniors, average SAT 1358 from 9 juniors, AP scores 50% 3+, and IB Class of 2018 mean score 32 with 4 of 5 diploma candidates earning diplomas.; Small academic environment reported: Upper School average class size 12, no core academic class larger than 16, 6:1 student-faculty ratio, and 77% of Upper School faculty with advanced degrees.; Testing policy for college admission is not reported in the supplied evidence.; College counseling has a dedicated department with a Director of College Counseling, two Assistant Directors of College Counseling, and college counseling support.; Student-body reach includes 19 international students in the Upper School, with about half living with host families; states/countries represented are not otherwise quantified.; Financial aid is awarded to approximately 25% of students.; College outcomes evidence includes typical 100% four-year college attendance and a five-year matriculation list for Classes of 2014-2018, including NYU, Syracuse, Trinity, Barnard, Cornell, Emory, University of Michigan, Wesleyan, Northwestern, Tufts, University of Virginia, and Wake Forest. |