401(k) · DOL Form 5500 · 2023

Brookline Bancorp, Inc. 401(k) Plan

Data updated 2026-08-11

$146M
Total assets: 841
Participants: 93rd
Percentile by assets: $173,691
Avg per participant

Official DOL plan name: Brookline Bancorp 401(k) Plan · Sponsored by Brookline Bancorp, Inc. · Massachusetts · Finance & Insurance

$146M in assets, 841 participants

Brookline Bancorp, Inc.'s Brookline Bancorp 401(k) Plan reported $146M in total assets and 841 participants in its 2023 DOL Form 5500 filing, ranking in the 93rd percentile by assets among filed plans. Figures are as reported by the plan sponsor to the Department of Labor, not audited or endorsed by PlainRetire.

93rd percentile by assets (of 127,072 plans)
#7,953 in Finance & Insurance (8,869 peers)

Where Brookline Bancorp 401(k) Plan sits by assets

Brookline Bancorp 401(k) Plan sits in the top 10% of all filed plans by assets, $146M for 841 participants (~$173,691/participant), up 31.4% in 2023.

$146M
total plan assets (2023 EOY): 841
covered participants: 93rd
percentile by assets (of 127,072 plans): $173,691
avg assets per participant

Where Brookline Bancorp 401(k) Plan sits by total assets

Brookline Bancorp 401(k) Plan vs every filed plan by assets

End-of-year total assets · plan year 2023 · DOL Form 5500

$146,074,170 Top 7% higher than 93% of 127,068 filed plans

Dashed line + filled bar = this entry, among filed plans.

Source U.S. Department of Labor Form 5500 filings (EBSA) · plan year 2023

Brookline Bancorp 401(k) Plan reported net income rose from -$18M in the plan year 2022 filing to $35M in the plan year 2023 filing.
Brookline Bancorp 401(k) Plan end-of-year assets rose from $111M in the plan year 2022 filing to $146M in the plan year 2023 filing.
Brookline Bancorp 401(k) Plan reported participants rose from 806 in the plan year 2022 filing to 841 in the plan year 2023 filing.

See the national 2022→2023 release diff →

State

Massachusetts

Industry

Finance & Insurance

Brookline Bancorp 401(k) Plan vs the 2023 asset distribution

By assets, Brookline Bancorp 401(k) Plan outranks 93% of the 127,072 plans that filed a Form 5500 for the 2023 plan year, and holds roughly 1.5x the national average plan size of $100M (721 average participants).

Scale-class filing particulars (2023)

Total Assets (Beginning of Year)	$111M
Net Assets (End of Year)	$146M
Net Income	$35M
Employer EIN	043402944
Plan Effective Date	1996-05-01
Filing Status	FILING RECEIVED

Sponsor Plan History (Brookline Bancorp, Inc.)

Total plan assets by year, all Brookline Bancorp, Inc. plans on file

Year	Plans	Participants	Total Assets
2022	2	1,499	$121M
2023	2	1,555	$153M
2024	2	1,040	$176M

Nearby 401(k) Plans in Massachusetts

Peer 401(k) plans, same state, same plan type, ranked by total assets.

Brookline Bancorp 401(k) Plan vs. nearby 401(k) plans in Massachusetts, assets vs. participants

Fidelity Retirement Savings Plan $28.6B · 62,289
Liberty Mutual 401(k) Plan $10.6B · 37,052
Massachusetts Institute of Technology Supplemental 401(k) Plan $6.8B · 14,094
Boston Scientific Corporation 401(k) Retirement Savings Plan $5.8B · 19,881
Philips North America 401(k) Plan $5.8B · 19,120

Compare Brookline Bancorp 401(k) Plan side-by-side with 3 peers →

Similar-Sized 401(k) Plans Nationally

401(k) plans in other states closest to Brookline Bancorp 401(k) Plan by total assets, not by location.

Blue Diamond Growers Retirement Savings Plan (CA) $146M · 1,638
Kawasaki Motors Corp., U.S.a. 401(k) Profit Sharing Plan (CA) $146M · 661
Sailpoint Technologies Inc. 401(k) Profit Sharing Plan and Trust (TX) $146M · 1,486
Tricorbraun 401(k) Plan (MO) $146M · 1,008

Frequently Asked Questions

How did Brookline Bancorp 401(k) Plan assets move in 2023? ▼

Brookline Bancorp 401(k) Plan surged - up 31.4% during 2023, from $111M to $146M. Reported net income was $35M.

How have Brookline Bancorp, Inc. plan assets changed over time? ▼

Across 3 plan years on file (2022-2024), Brookline Bancorp, Inc.'s sponsor-wide assets grew 46.0%, from $121M to $176M.

Where does Brookline Bancorp 401(k) Plan rank by assets among Form 5500 filers? ▼

Brookline Bancorp 401(k) Plan ranks in the 93rd percentile by end-of-year assets among 127,072 plans that reported assets for plan year 2023 (in the top 10% of all filed plans by assets).

Which 401(k) plans are similar in size to Brookline Bancorp 401(k) Plan? ▼

Among 401(k) plans in other states, the closest by assets is Blue Diamond Growers Retirement Savings Plan in CA ($146M, 1,638 participants).

Next read for Brookline Bancorp 401(k) Plan

Scale reading

Ways to act on Brookline Bancorp 401(k) Plan's numbers.

By total assets, Brookline Bancorp 401(k) Plan ranks in the top 10% of all filed plans by assets. See the largest plans
Compare it side-by-side against 3 similar 401(k) plans in Massachusetts. Compare plans
Brookline Bancorp, Inc.'s sponsor-wide assets have grown 46.0% since 2022 across 3 plan years on file. More Finance & Insurance plans

Source: U.S. Department of Labor, Employee Benefits Security Administration (EBSA), Form 5500 public disclosure dataset. Plan year 2023.

Source: DOL EFAST2 filing system (efast.dol.gov) - original filing retrieval by EIN 043402944.