401(k) · DOL Form 5500 · 2023

Brookline Bancorp, Inc. 401(k) Plan

Data updated 2026-08-25

$146M
Total assets Near avg plan size
841
Participants Near avg headcount
93rd
Percentile by assets National rank
$173,691
Avg per participant Above avg balance/head
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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.

  • #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.

#7,953
in Finance & Insurance (8,869 peers)
+31.4%
assets growth YoY
1.5×
vs typical plan assets (national mean)

Brookline Bancorp 401(k) Plan's outsized position 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

This plan $0 $2,050,000,000 every filed plan with reported assets, bucketed by value

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 among mid-size filed plans by headcount

Plan-year 2023 Form 5500 filings with a reported participant count, partitioned by headcount band, not by assets. Brookline Bancorp 401(k) Plan sits mid-pack in the medium band (841 participants).

What changed between DOL Form 5500 filings

plan year 2022 → 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 →

Plan-year Form 5500 strip

Filing strip 043402944 · Brookline Bancorp, Inc. PY 2023 · 401(k)

Brookline Bancorp 401(k) Plan · $146M · 841 · 93rd

  • TYPE $146M
  • NET 841
  • BOOK 93rd
  • VS-ST 401(k)
  • BOY near Blue Diamond Growers Retirement Savings Plan
  • SCH ind #7953

Stamps derive from this plan's Form 5500 line items (assets, participants, type, EIN, cohort placement) - not a quality rating of the sponsor. Read with Finance & Insurance retirement plans → · Plans in Massachusetts →

Brookline Bancorp 401(k) Plan in the asset neighbourhood

Tricorbraun 401(k) Plan$146MSailpoint Technologies Inc. 401(k) Profit Sharing Plan and TrustSailpoint Technologies Inc. …$146MBrookline Bancorp 401(k) Plan$146MBlue Diamond Growers Retirement Savings PlanBlue Diamond Growers Retirem…$146MKawasaki Motors Corp., U.S.a. 401(k) Profit Sharing PlanKawasaki Motors Corp., U.S.a…$146M
End-of-year total assets ($M) among Brookline Bancorp 401(k) Plan and nearest nationwide 401(k) peers. Source: DOL Form 5500 plan year 2023.

Scale-class filing particulars (2023)

Total Assets (Beginning of Year)$111M
Net Assets (End of Year)$146M
Net Income$35M
Employer EIN043402944
Plan Effective Date1996-05-01
Filing StatusFILING RECEIVED

Sponsor Plan History (Brookline Bancorp, Inc.)

Sponsor-wide plan assets over time

All Brookline Bancorp, Inc. plans reported in each filing year

Latest sponsor-wide plan assets
$176M 45.957666231472146% vs 2022
2024 filing year
$100M$120M$140M$160M$180M$200M 202220232024 $121M $176M ▲ +46.0%
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 Scatter plot of 6 data points. -20000020000400006000080000 -10010203040 Total assets ($B) Participants Brookline Bancorp 401(k) Plan, Total assets ($B): 0.14607417 · Participants: 841Brookline Bancorp 401(k) PlanFidelity Retirement Savings Plan, Total assets ($B): 28.649852331 · Participants: 62289Fidelity Retirement Savings PlanLiberty Mutual 401(k) Plan, Total assets ($B): 10.556596852 · Participants: 37052Liberty Mutual 401(k) PlanMassachusetts Institute of Technology Supplemental 401(k) Plan, Total assets ($B): 6.829912863 · Participants: 14094Massachusetts Institute of Technology Supplemental 401(k) PlanBoston Scientific Corporation 401(k) Retirement Savings Plan, Total assets ($B): 5.786107181 · Participants: 19881Boston Scientific Corporation 401(k) Retirement Savings PlanPhilips North America 401(k) Plan, Total assets ($B): 5.779286156 · Participants: 19120Philips North America 401(k) Plan
Brookline Bancorp 401(k) Plan vs. nearby 401(k) plans in Massachusetts, assets vs. participants
Compare Brookline Bancorp 401(k) Plan side-by-side with 3 peers →

Brookline Bancorp 401(k) Plan's out-of-state 401(k) peers by assets and headcount

Outside Massachusetts, the nearest 401(k) by assets is Blue Diamond Growers Retirement Savings Plan in CA ($146M); by covered participants it is Colony Tire Corporation 401(k) Plan in NC (841 participants). Same-state nearby plans are listed separately above.

Similar participant headcount

Nearest other-state filings by covered participants (841 participants); asset peers above are excluded.

DOL Form 5500 plan year 2023. Asset totals can differ widely at the same headcount; neither axis is a quality rating.

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).
Which 401(k) plans cover a similar participant headcount to Brookline Bancorp 401(k) Plan? ▼
Among 401(k) plans in other states, the closest by covered participants is Colony Tire Corporation 401(k) Plan in NC (841 participants, $34M in assets).

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.

Read our methodology - how this data is sourced, computed, and verified.

Data sourced from U.S. Department of Labor Form 5500 filings (EBSA). See our methodology for details.