MGB Pooled Holdings LLC logo

MGB Pooled Holdings LLC

Public charity · Grantmaker Somerville, MA EIN: 82-1715859 Website

Investing pooling entity

Key facts about MGB Pooled Holdings LLC

In short: MGB Pooled Holdings LLC gave $484.0M across 1 grant in 2025 (avg $484.0M), mostly in Massachusetts. Source: 2025 IRS Form 990.

EIN
82-1715859
Latest 990 filing
Form 990, 2025
Annual giving (2025)
$483,991,393
Grants made (2025)
1
Average grant
$483,991,393
Median grant
$483,991,393
Total assets
$18,204,721,570
Primary geography
Massachusetts (100% of itemized 2025 grant dollars)

Data from IRS Form 990, 2025; updated September 2026.

Financial Overview

From 2025 IRS Form 990 · View filing

Total Assets

$18.2B

+12.1% YoY

Annual Giving

$484.0M

+116.0% YoY

Grant Count

1

+0.0% YoY

Avg Grant Size

$484.0M

+116.0% YoY

How MGB Pooled Holdings LLC gives

  • Giving fell 71% from 2022 to 2025. Method

From the foundation's IRS Form 990 filings. Methodology.

About MGB Pooled Holdings LLC

Based on IRS filings

MGB Pooled Holdings LLC is a public charity focused on Health, based in Somerville, MA. IRS filing data is available from 2019 through 2025. As of 2025, the organization holds $18.2B in total assets. In 2025, it awarded 1 grant totaling $484.0M. Net investment income was $1.4B.

Focus Areas

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Geographic Focus

Where this funder awards grants

Grant Distribution by State

1state

Share of all 1 itemized 2025 grant dollars.

Cities

Boston

Giving Over Time

Total grant dollars and number of grants per year

$0$500M$1B$1.5B$2B0 grants20190 grants20200 grants20211 grants20221 grants20231 grants20241 grants2025

From 2022 to 2025, annual grant giving ranged from $224.1M (2024) to $1.6B (2022). In 2025 it made 1 grant totaling $484.0M.

Grant Insights

How this funder distributes its grants

Top Recipients

Top 1 recipients in 2025

Mass General Brigham Incorporated & Affiliates: $484.0MMass General BrighamIncorporated & Affiliates$484.0M

The largest 2025 recipient was Mass General Brigham Incorporated & Affiliates ($484.0M).

Grant Size Distribution

4 grants across all recorded years

<$50K$50–100K$100–250K$250–500K$500K–1M$1–5M4$5M+

The most common grant size was $5M or more: 4 grants of 4 (100%).

Giving History

Grant recipients and amounts by year

RecipientPurposeAmount
Mass General Brigham Incorporated & Affiliates Boston, MACommunity Benefit Program$483,991,393

Financial History

Multi-year comparison from IRS filings

Revenue
Expenses
Net Investment Income
$0$1B$2B$3B$4B2019202020212022202320242025
Metric202520242023
Total Assets$18,204,721,570$16,237,955,473$13,908,771,312
Revenue$1,412,842,009$892,056,130$272,820,546
Expenses$483,991,393$224,054,030$508,485,929
Net Investment Income$1,412,842,009$892,056,130$272,820,546

Data update history

When this profile's IRS filing data changed on Grantable

  1. Added Form 990 for fiscal year 2019 (received by the IRS August 14, 2020)
  2. Updated Form 990 for fiscal year 2022 (received by the IRS August 14, 2023)
  3. Updated Form 990 for fiscal year 2023 (received by the IRS August 13, 2024)
  4. Updated Form 990 for fiscal year 2024 (received by the IRS August 14, 2025)
  5. Added Form 990 for fiscal year 2025 (received by the IRS August 13, 2026)

Leadership & Key People

Officers and directors from IRS filings

MGB Pooled Holdings LLC is led by Emma Somers-Roy, President since 2024 (on filings since 2023); none of the 3 officers listed in 2025 report compensation.

Officers on the 2025 filing

  • Emma Somers-Roy

    President

    President Since → President, 2024

    On filings since 2023

    1 hr/week

    No compensation reported

  • Debra Sloan

    Secretary

    Manager → Secretary, 2023

    On filings since 2019

    1 hr/week

    No compensation reported

  • Niyum Gandhi

    Treasurer

    Treasurer, Secretary & Manager Since → Treasurer, 2023

    On filings since 2022

    1 hr/week

    No compensation reported

Former officers (2)
  • Former: John R. Barker (2019–2024) — Former O - Mgbph
  • Former: Peter K. Markell (2019–2024) — Former O - Mgbph

Data from IRS Form 990 filings, 2019–2025. "On filings since" is the earliest filing we hold that lists the person; hours are average hours per week as reported.

Frequently asked questions about MGB Pooled Holdings LLC

How much does MGB Pooled Holdings LLC give each year?

MGB Pooled Holdings LLC gave $484.0M across 1 grant in 2025, according to its 2025 IRS Form 990. In 2024 it gave $224.1M across 1 grant.

How large is MGB Pooled Holdings LLC?

MGB Pooled Holdings LLC reported $18.2B in total assets on its 2025 IRS Form 990. Its revenue that year was $1.4B.

What is MGB Pooled Holdings LLC?

MGB Pooled Holdings LLC is a public charity focused on Health, based in Somerville, MA. It holds $18.2B in total assets as of 2025.

Where does MGB Pooled Holdings LLC operate?

MGB Pooled Holdings LLC has awarded grants in Massachusetts.

What is MGB Pooled Holdings LLC's EIN?

MGB Pooled Holdings LLC's EIN (Employer Identification Number) is 82-1715859. IRS Form 990 filing data is available on this page for 2019–2025.

Data last updated September 2026. Sourced from IRS Form 990 filings.

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