How big is Third Rock Ventures, LLC's plan?

Third Rock Ventures, LLC's plan covered 70 participants for 2024.

Original filing (PDF)20250926100508NAL0009987328001

Third Rock Ventures, LLC

Name: Third Rock Ventures, LLC — Third Rock 401(k) Plan, Form 5500 (2024)
Creator: Third Rock Ventures, LLC
License: https://www.usa.gov/government-works

Form 5500

FILING_RECEIVED

Third Rock 401(k) Plan

401(k) retirement plan · Third Rock Ventures, LLC's Third Rock 401(k) Plan covered 70 participants in 2024.

Active participants

Accounts w/ balance

102

Plan assets (EOY)

—

Net assets (EOY)

—

People on this filing

Alison Connors signed Third Rock Ventures, LLC's 2024 Form 5500 as plan administrator.

Alison Connors — Plan Administrator — Form 5500 signer

Get verified email & phone for these signers

Signer names are public record from the Form 5500 e-signature.

Plan identifiers

Third Rock Ventures, LLC's EIN is 20-8667706.

EIN 20-8667706

Plan number 001

Plan year 2024

ACK ID 20250926100508NAL0009987328001

Official Form 5500 document

Download the official 2024 Form 5500 (PDF) for Third Rock Ventures, LLC from the U.S. Department of Labor's EFAST2 system.

Download the official 2024 Form 5500 (PDF)

Plan features

Third Rock Ventures, LLC's plan includes a 401(k) feature, profit-sharing, ERISA 404(c) participant direction, a default investment (QDIA).

Decision-maker contacts

One unlock reveals every key decision-maker — plan signer, CFO, HR & Benefits — with verified email + LinkedIn for THIRD ROCK VENTURES, LLC.

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How this plan invests

This plan

1 collective trust

Schedule D

Individual securities

on each trust's filing

This plan doesn't hold securities directly — it invests through trusts. Click a trust below to drill into its securities.

Plan health score

Top-tier plan health

Directional indicator from public Form 5500 data — compliance & integrity, total plan cost, participant health and vendor stack, benchmarked against same-size peers. Not a fiduciary tool. Based on 70% of scoring inputs for this filing.

Compliance & integrity

100

Total plan cost

n/a

Plan health

Vendor & structure

100

Helping the score

Cost not scored — no comparable Schedule H expense data for this cohort.
High account-holder ratio — balance-holders per active participant in the top 15% of peers (89th percentile).

Plan sponsor

Name

THIRD ROCK VENTURES, LLC

EIN

all filings

Address

201 BROOKLINE AVENUE · SUITE 1401 · BOSTON, MA · 02215

Phone

(617) 585-2000

Industry

Finance & Insurance

Plan administrator

Same as plan sponsor.

Plan characteristics

Plan number

001

Plan year

2024

Plan year begin

2024-01-01

Tax period

2024-12-31

Filed

2025-09-26

Pension benefit codes

2G · Total participant-directed accounts

2J · 401(k) feature

2K · 401(m) arrangement

3B · Covers self-employed individuals

3F · Sponsor used leased employees

2E · Profit-sharing

2F · ERISA section 404(c)

2T · Default investment account (QDIA)

Service providers (Schedule C)

No Schedule C providers reported

Investments

1 pooled fund· $76K

Rows tagged as a trust or pooled fund hold many underlying securities. Click one to drill into its own Schedule of Assets — where the individual funds, shares, and CUSIPs live.