MGB Pooled Holdings LLC
Investing pooling entity
MGB Pooled Holdings LLC at a glance
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.
- Annual giving (2025)
- $483,991,393
- +116.0% vs 2024
- Grants made (2025)
- 1
- +0.0% vs 2024
- Average grant
- $483,991,393
- +116.0% vs 2024
- Median grant
- $483,991,393
- Total assets
- $18,204,721,570
- +12.1% vs 2024
- Primary geography
- Massachusetts (100% of itemized 2025 grant dollars)
- Latest 990 filing
- Form 990, 2025 View filing
Data from IRS Form 990, 2025; updated September 2026.
Who MGB Pooled Holdings LLC funds
How this funder distributes its grants
Top Recipients
Top recipient in 2025
The largest 2025 recipient was Mass General Brigham Incorporated & Affiliates ($484.0M).
Grant Size Distribution
4 grants across all recorded years
The most common grant size was $5M or more: 4 grants of 4 (100%).
Geographic Focus
Where this funder awards grants
Grant Distribution by State
Share of the 2025 grant dollars on its one itemized grant.
States
Cities
How MGB Pooled Holdings LLC gives
- Giving fell 71% from 2022 to 2025. Method
From the foundation's IRS Form 990 filings. Methodology.
Giving History
Giving Over Time
Total grant dollars and number of grants per year
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.
Grants by year
Grant recipients and amounts by year
| Recipient | Purpose | Amount |
|---|---|---|
| Mass General Brigham Incorporated & Affiliates Boston, MA | Community Benefit Program | $483,991,393 |
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Financial History
Multi-year comparison from IRS filings
| Filing year | Total Assets | Revenue | Expenses | Grants paid | Grants | Net Investment Income |
|---|---|---|---|---|---|---|
| 2025 | $18,204,721,570 | $1,412,842,009 | $483,991,393 | $483,991,393 | 1 | $1,412,842,009 |
| 2024 | $16,237,955,473 | $892,056,130 | $224,054,030 | $224,054,030 | 1 | $892,056,130 |
| 2023 | $13,908,771,312 | $272,820,546 | $508,485,929 | $508,485,929 | 1 | $272,820,546 |
| 2022 | $13,155,018,220 | $499,107,384 | $1,645,523,450 | $1,645,523,450 | 1 | $499,107,384 |
| 2021 | $17,158,336,920 | $817,459,178 | — | — | — | $668,883,500 |
| 2020 | $13,962,698,228 | $2,865,212,883 | — | — | — | $515,185,890 |
| 2019 | $10,686,197,340 | $1,440,703,778 | — | — | — | $594,632,644 |
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
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.
Data update history
(5)
When this profile's IRS filing data changed on Grantable
- Updated Form 990 for fiscal year 2022 (received by the IRS August 14, 2023)
- Updated Form 990 for fiscal year 2023 (received by the IRS August 13, 2024)
- Updated Form 990 for fiscal year 2024 (received by the IRS August 14, 2025)
- Added Form 990 for fiscal year 2025 (received by the IRS August 13, 2026)
- Added Form 990 for fiscal year 2019 (received by the IRS August 14, 2020)
Live grants for the work MGB Pooled Holdings LLC funds
Health Open opportunities, soonest deadline first.
Explore Open Grants
Browse active grant opportunities in MGB Pooled Holdings LLC's focus areas in our free grants database
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