Data Analysis
The Eight Schools Association and Ten Schools Admission Organization: Billion-Dollar Endowments and the Pipeline to Elite College
By Data Team | Published October 9, 2026
The independent boarding school sector in the United States is historically anchored by two prominent academic consortiums: the Eight Schools Association (ESA) and the Ten Schools Admission Organization (TSAO). These eleven distinct institutions operate as primary feeder pipelines to the nation's most selective research universities and liberal arts colleges.
Our latest analysis of matriculation data shows membership in the "Group of Seven" correlates with sustained Top 25 and Ivy+ admissions outcomes. This review will quantify the specific collegiate destination tiers within these historic networks.
Summary
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The Ivy+ Feeders: Supported by substantial institutional resources, schools within the "Group of Seven" generate strong Ivy+ matriculation. Phillips Academy Andover and Phillips Exeter Academy lead absolute volume, both schools log 31% yield, closely followed by Hotchkiss (25%) and Lawrenceville (25%).
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25 of 25: Looking beyond the Ivies, schools spanning both the ESA and TSAO demonstrate significant higher Top 25 (T25) National placements. Andover sees 50% of its cohort attend T25 universities, while all Schools but Northfield Mount Hermon secured a 25%+ yield to the T25 tier.
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Financial Accessibility: Combined, these eleven independent schools maintain over $7 billion in endowments. Institutions like Andover ($1.47B) and Exeter ($1.65B) utilize this wealth to institute zero-tuition thresholds and need-blind admissions, altering the socioeconomic diversity of their applicants.
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The Liberal Arts Pipeline: While Ivy+ metrics often dominate the discourse, Top 15 Liberal Arts Colleges (LACs) remain a critical off-ramp for these consortiums. Mid-Atlantic prep schools particularly excel here, with The Lawrenceville School (13%) and The Hill School (10%) leading the T15 LAC matriculation rates, demonstrating a distinct regional counseling preference compared to their New England peers.
Understanding the Consortiums
Eight Schools Association (ESA)
Formally established in 1973 (tracing collaborative roots back decades earlier), the ESA functions as an athletic, academic, and administrative alliance. Heads of school, deans, and college counselors meet regularly to discuss pedagogical shifts, administrative challenges, and overarching collegiate counseling strategies.
Members: Andover, Exeter, Choate, Deerfield, Hotchkiss, Lawrenceville, St. Paul's, and Northfield Mount Hermon. The inclusion of NMH rounds out the group by integrating a unique experiential education component (Workjob) into the traditional New England lineup.
Ten Schools Admission Organization
Founded earlier in 1966, the TSAO is a consortium dedicated explicitly to joint admissions outreach. By coordinating national and international admissions events, these highly selective schools cast a wider applicant net, sharing data and best practices to attract the most academically capable students globally.
Members: The "Group of Seven" core, supplemented by The Taft School, The Loomis Chaffee School, and The Hill School, bridging the geographic gap from Connecticut down to Pennsylvania.
Data Insight: The 3 TSAO-only schools demonstrate remarkably consistent matriculation, all capturing between 26% and 31% for T25 placements, outperforming the ESA-only member.
The "Group of Seven" Core
The overlap between these two groups represents the foundational elements of the American boarding school tradition. Often referenced colloquially as the "Group of Seven," this cohort includes Choate Rosemary Hall, Deerfield Academy, The Hotchkiss School, The Lawrenceville School, Phillips Academy Andover, Phillips Exeter Academy, and St. Paul's School. Operating with significant institutional resources, they effectively function as collegiate incubators.
The "Big Two" Scale Advantage
Within the broader consortiums, Phillips Academy Andover and Phillips Exeter Academy operate on an entirely different scale. As the only two schools with enrollments exceeding 1,000 students and endowments surpassing $1.4 billion, they leverage massive alumni networks and unparalleled faculty resources. This macro-scale translates directly into outcome volume: they are the only institutions in the group to break the 30% threshold for Ivy+ placements (both at 31%) and functionally capture a 50% yield into the Top 25 National tier.
The School Data Matrix
The table below aggregates institutional baselines, endowment scale, and collegiate placement metrics for all eleven member schools across the ESA and TSAO. A correlation emerges at the very top between endowment size and tier-one placement: institutions exceeding $1 billion in endowment (Andover, Exeter) secure T25 placement rates near 50%. However, financial scale is not the absolute determiner of success; TSAO members with endowments under $400 million, such as Loomis Chaffee ($350M) and The Taft School (~$283M), still capture formidable T25 placement rates of 31%, outperforming $920.0M-Deerfield Academy's 28%. Note: Endowment figures and tuition reflect the most recently available 2024/2026 data cycles.
Consortium Overview
Compiled placement models across the Mid-Atlantic and New England regional ECPI databases.
Placement Density Visualization
The visualization below translates the raw placement density metrics into individual dot-matrix sub-charts for each collegiate category. This illustrates the proportion of the cohort entering specific tiers. Each dot represents approximately 10 enrolled students relative to total enrollment.
Geographic Map: The Consortium Footprint
The interactive map below plots all 11 institutions belonging to either the Eight Schools Association, the Ten Schools Admission Organization, or both. Their geographic concentration across New England and the Mid-Atlantic underscores the historical density of American boarding schools along the Northeast corridor.
Consortium Membership
Frequently Asked Questions
Based on our ongoing tracking of these highly selective independent schools, here are answers to common analytical questions regarding the Eight Schools Association and Ten Schools Admission Organization.
Founded in 1973, the Eight Schools Association (ESA) is an athletic, academic, and administrative consortium of eight highly selective university-preparatory schools in the Northeast, including Choate, Andover, Exeter, Deerfield, Hotchkiss, Lawrenceville, NMH, and St. Paul's.
The Ten Schools Admission Organization (TSAO) is a consortium formed in 1966. It facilitates joint admissions outreach and shares data best practices among 10 historically elite American preparatory schools. It includes the "Group of Seven" plus Taft, Loomis Chaffee, and The Hill School.
According to current data modeling across available cohorts, Phillips Academy Andover and Phillips Exeter Academy lead absolute volume, both around 50% estimated yield into Top 25 national universities.
The "Group of Seven" refers to the seven elite preparatory schools that hold membership in both the Eight Schools Association and the Ten Schools Admission Organization: Andover, Exeter, Choate, Deerfield, Hotchkiss, Lawrenceville, and St. Paul's. Historically, these schools represent the core archetype of the American boarding school.
No. While Phillips Exeter ($1.65B) and Phillips Academy Andover ($1.47B) maintain endowments exceeding a billion dollars (and Deerfield approaches $1B), the remaining schools operate robust endowments generally ranging from $160 million (The Hill School) to roughly $760 million (St. Paul's).
Substantial endowments allow several of these institutions to implement need-blind admissions and meet 100% of demonstrated financial need. This enables schools like Andover and Exeter to broaden their applicant pools and admit highly qualified students regardless of socioeconomic background, which in turn sustains high collegiate placement rates.
Top 25 National Universities refer to major research institutions (R1) encompassing the Ivy League, Stanford, MIT, and leading public flagships. Top 15 Liberal Arts Colleges (LACs) represent highly selective, smaller institutions like Williams, Amherst, and Swarthmore that focus exclusively on undergraduate teaching. Boarding school students frequently apply to both tiers.
Northfield Mount Hermon (NMH) differentiates itself within the Eight Schools Association through its distinctive experiential education model. It requires students to participate in a "Workjob" program, contributing to campus operations, which balances the deeply traditional academic rigor expected from New England boarding schools.
While top public magnet schools often match or occasionally exceed these boarding schools in raw numbers of Ivy+ acceptances, the ESA and TSAO schools generally maintain higher placement percentages relative to their total graduating class size. Boarding schools also benefit from robust institutional relationships with college admissions offices developed over generations.
Data Sources & Methodology
The admissions data and metrics referenced throughout this report are derived directly from institutional disclosures and our aggregated historical tracking.
- Eight Schools Association (ESA) Home
- Wikipedia - Eight Schools Association (ESA) Details and History
- Ten Schools Admission Organization (TSAO) Home
- Wikipedia - Ten Schools Admission Organization (TSAO) Details
- ProPublica Nonprofit Explorer (For Form 990 Endowment and Asset Data verification)
- Chicardgo School - New York City Private ECPI Data
- Chicardgo School - Boston Private ECPI Data
- Chicardgo School - Philadelphia Private ECPI Data
- Chicardgo School - Choate Rosemary Hall Placement Report
- Chicardgo School - Deerfield Academy Placement Report
- Chicardgo School - The Hotchkiss School Placement Report
- Chicardgo School - The Lawrenceville School Placement Report
- Chicardgo School - Phillips Academy Andover Placement Report
- Chicardgo School - Phillips Exeter Academy Placement Report
- Chicardgo School - St. Paul's School Placement Report
- Chicardgo School - The Hill School Placement Report
- Chicardgo School - Loomis Chaffee School Placement Report
- Chicardgo School - The Taft School Placement Report
- Chicardgo School - Northfield Mount Hermon School Placement Report
Further Reading
How does Choate Rosemary Hall's Elite Placements Compare to New York City Private schools
Objective analysis of Choate Rosemary Hall's college placement data, examining its ECPI ranking, Ivy+ pipelines, and regional matriculation footprint across five graduating classes (2021-2025).
How does Deerfield Academy Compare to Boston-Area Private Schools
Analysis of Deerfield Academy's college placement data, examining its Ivy+ pipelines, T25 matriculation footprint, and performance against Boston-area independent schools.
How does The Hotchkiss School's Elite Placements Compare to New York City Private schools
Objective analysis of The Hotchkiss School's college placement data, comparing its Ivy+ pipelines and T25 matriculation to New York City private day schools.
The Lawrenceville School Outperforms Philadelphia Private Competitors
Analysis of The Lawrenceville School's college placement data, examining its Ivy+ pipelines, T15 LAC footprint, and its #1 performance ranking in the Greater Philadelphia ecosystem.
Institutional Might, Historic Endowments, and Global Scale - Phillips Academy Andover Secures #2 in Boston Private High School Elite College Placement Index
An in-depth analysis of Phillips Academy Andover's college placement, examining its Ivy League matriculation, need-blind admissions, $1.47B endowment, and its #2 standing in the Boston Private High School Elite College Placement Index.
How does Phillips Exeter Academy Compare to Boston-Area Private Schools
Analysis of Phillips Exeter Academy's college placement data, examining its Ivy+ pipelines, T25 matriculation footprint, and its performance against elite New England boarding peers.
How does St. Paul's School (New Hampshire) Compare to Boston-Area Private Schools
Analysis of St. Paul's School's college placement data, examining its Ivy+ pipelines, T25 matriculation footprint, and its performance against elite New England boarding peers.
How does The Hill School Compare to Philadelphia-Area Private Schools
Analysis of The Hill School's college placement data, examining its T25 pipelines, T15 LAC footprint, and its performance against highly selective Philadelphia and New Jersey boarding peers.
How does Loomis Chaffee School's Elite Placements Compare to New York City Private schools
Objective analysis of Loomis Chaffee School's college placement data, examining its ECPI ranking, Ivy+ pipelines, and regional matriculation footprint across five graduating classes.
How does The Taft School's Elite Placements Compare to New York City Private schools
Objective analysis of The Taft School's college placement data, examining its ECPI ranking, Ivy+ pipelines, and regional matriculation footprint across five graduating classes (2020-2024).
How does Northfield Mount Hermon School Compare to Boston-Area Private Schools
Analysis of Northfield Mount Hermon School's college placement data, examining its Ivy+ pipelines, T25 matriculation footprint, and its performance against elite New England boarding peers.