Brookline Bancorp, Inc. 401(k) Plan: Login, Facts & Contact Information

Brookline Bancorp, Inc. 401(k) Plan Facts

Plan name
BROOKLINE BANCORP 401(K) PLAN
Plan type
401(k) with employer contributions and profit sharing
Plan sponsor
BROOKLINE BANCORP, INC.
Participants
1,298 (998 active employees)
Former employees with a balance
341
Plan assets
$168,735,553 at Dec 31, 2024
Average account balance
$127,252 across 1,326 accounts
Employer contributions
$4,852,967 in plan year 2024 (27% of all contributions)
Recordkeeper
Fidelity Investments Institutional
Plan year
Jan 1, 2024 – Dec 31, 2024
Plan established
May 1, 1996
✓ Employer contributions— Automatic enrollment✓ Default investment for undecided participants✓ Participants choose their own investments✓ Self-directed brokerage window✓ Profit sharing— Company stock (ESOP)

Source: Form 5500 for plan year 2024 (Jan 1, 2024 – Dec 31, 2024), filed Oct 15, 2025. Public filing with the U.S. Department of Labor.

Money in and out in plan year 2024

  • $17.9 million went into the plan in contributions, $4.85 million of it from the employer (27%).
  • $19.2 million was paid out to participants.
  • Investment and other income added $24.1 million.
  • Administrative expenses were $138,164, about $104 per account.

How the Brookline Bancorp, Inc. 401(k) changed, 2019–2024

Plan yearParticipantsPlan assetsEmployer contributionsBenefits paid
20191,034$95.4 million$3.17 million$7.48 million
20201,061$112.1 million$3.32 million$8.10 million
20211,084$129.1 million$3.43 million$10.5 million
20221,103$111.2 million$3.76 million$5.80 million
20231,147$146.1 million$4.63 million$8.18 million
20241,298$168.7 million$4.85 million$19.2 million

Brookline Bancorp, Inc. 401(k) Contact Information

Phone
617-927-4848
Mailing address
PO BOX 179179, BOSTON MA 021179179
Plan sponsor
BROOKLINE BANCORP, INC.
Employer identification number (EIN)
04-3402944
Plan number
004

Questions about the Brookline Bancorp, Inc. 401(k)

Does Brookline Bancorp, Inc contribute to the 401(k)?

Yes. The plan reports an employer contribution arrangement. In plan year 2024 the employer contributed $4.85 million, 27% of all contributions.

Does the Brookline Bancorp, Inc 401(k) have automatic enrollment?

No. The plan does not report automatic enrollment; employees enroll themselves.

How many people are in the Brookline Bancorp, Inc 401(k) plan?

1,298 participants at the start of plan year 2024, 998 of them active employees, and 341 former employees who still had money in the plan.

What is the average 401(k) balance at Brookline Bancorp, Inc?

About $127,252 per account: $168.7 million in plan assets across 1,326 accounts with a balance at the end of plan year 2024.

Who manages the Brookline Bancorp, Inc 401(k) accounts?

Fidelity NetBenefits (listed on the filing as FIDELITY INVESTMENTS INSTITUTIONAL) is the plan's recordkeeper, which is where participants log in to see their balance.

I no longer work at Brookline Bancorp, Inc. How do I access my 401(k)?

Your account stays with Fidelity NetBenefits after you leave, so you can log in with the same credentials. If your balance was small, the plan may have rolled it into an IRA in your name. If you can't find it, Beagle can locate it for you.

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