Connecticut 401(k) plans

Name: Connecticut 401(k) plans: assets, participants and plan-paid fees
Creator: 401(k) Monitor
License: https://401kmonitor.com/licence/

828

Large 401(k) plans headquartered in Connecticut are in 401(k) Monitor’s published set, holding $191.6B in total, led on headcount by RTX Savings Plan with 123,327 active participants. Computed from DOL Form 5500 filings, plan years 2021–2025.

State means the sponsor’s address on the filing, not where employees work. Our published set covers 57,824 of the 57,824 large plans in the form-year-2024 DOL EFAST2 bulk data, so this is the largest-plan end of Connecticut, not a census of it.

40 of the biggest 401(k) plans headquartered in Connecticut

The plans this site submits to search engines come first, then the rest; each group is ranked by active participants, the people still building up a balance. plan years 2021–2025, DOL EFAST2 bulk data. Assets in USD. Every plan links to its full fact page.
#	Plan	City	Active participants	Assets
1	RTX Savings Plan	Farmington	123,327	$58.6B
2	Citi Retirement Savings Plan	Stamford	74,487	$23.2B
3	Hartford Healthcare 401(k) Retirement Plan	Farmington	29,076	$2.9B
4	International Union Of Journeymen And Allied Trades 401(k) Retirement Plan	Danbury	25,248	$139.5M
5	United Rentals 401(k) Investment Plan	Stamford	23,378	$2.3B
6	Yale-New Haven Hospital And Tax-Exempt Affliliates Retirement Savings Plan	New Haven	22,243	$1.1B
7	GXO Logistics 401(k) Plan	Greenwich	21,896	$438.3M
8	The Hartford Investment And Savings Plan	Hartford	18,645	$7.2B
9	Stanley Black & Decker Retirement Account Plan	New Britain	16,084	$2.5B
10	Assa Abloy Inc. Retirement Savings Plan	New Haven	14,342	$1.3B
11	Emcor Group, Inc. 401(k) Savings Plan	Norwalk	12,965	$1.7B
12	Frontier Communications 401(k) Savings Plan	Norwalk	12,015	$2.9B
13	Linde Retirement Savings Plan	Danbury	11,323	$2.9B
14	SS&C Technologies, Inc. 401(k) Retirement Savings Plan	Windsor	11,166	$1.8B
15	Gartner Inc. Savings And Investment Plan	Stamford	10,956	$2.7B
16	Synchrony Financial My Savings Plan	Stamford	10,687	$1.6B
17	Eversource 401(k) Plan	Hartford	10,538	$4.0B
18	Tetra Tech, Inc. And Subsidiaries Retirement Plan	New Milford	10,454	$2.2B
19	Nuvance Health 401(k) Retirement Savings Plan	Danbury	10,383	$1.2B
20	Hei Hotels And Resorts 401(k) Plan	Norwalk	10,066	$198.2M
21	Petvet Care Centers Management, LLC Retirement Savings Plan	Westport	9,731	$153.9M
22	Boehringer Ingelheim USA Corporation & Its Affiliates Retirement Savings Plan	Ridgefield	8,966	$3.1B
23	Xerox Corporation Savings Plan	Norwalk	8,279	$4.0B
24	Avangrid 401(k) Plan	Orange	8,263	$2.6B
25	Protos Security 401(k) Plan	Norwalk	8,167	$38.7M
26	Hubbell Incorporated Employee Savings & Investment Plan	Shelton	7,630	$1.2B
27	Bluetriton Brands, Inc. 401(k) Savings Plan	Stamford	7,096	$469.7M
28	Amphenol Corporation Employee Savings/401(k) Plan	Wallingford	6,984	$779.2M
29	Henkel 401(k) And Defined Contribution Plan	Stamford	6,972	$2.4B
30	Trc 401(k) Retirement And Savings Plan	Windsor	6,812	$776.1M
31	Laz Karp Associates, LLC 401(k) Plan	Hartford	6,802	$90.7M
32	Bob's Discount Furniture 401(k) Profit Sharing Plan	Manchester	6,781	$227.8M
33	Indeed, Inc. 401(k) Profit-Sharing Plan Trust	Stamford	6,555	$1.1B
34	W.R. Berkley Corporation Profit Sharing Plan	Greenwich	6,382	$2.3B
35	The Mohegan Retirement And 401(k) Plan	Uncasville	6,314	$500.1M
36	Pitney Bowes Inc. 401(k) Plan	Stamford	5,862	$1.7B
37	Terex Corporation And Affiliates 401(k) Retirement Savings Plan	Norwalk	5,794	$687.4M
38	Propark America, Inc. 401(k) Plan	Hartford	5,338	$13.3M
39	The Chef's Warehouse 401(k) Profit Sharing Plan & Trust	Ridgefield	5,198	$118.1M
40	Curaleaf, Inc. 401(k) Plan	Stamford	4,739	$17.8M

Every Connecticut plan, by size

The table above is the top of the list. These 6 pages hold all 828 plans on file from Connecticut, split by how many people are in them, each ranked by active participants.

100 to 499 participants · 561 plans
Pages1 2 3
500 to 999 participants · 115 plans
1,000 to 4,999 participants · 102 plans
5,000 or more participants · 50 plans

401(k) fees in Connecticut vs the national median

Plan-paid administrative cost per participant, plan years 2021–2025 Form 5500 filings. Medians over our published set, not the full universe.
Connecticut medianAcross the 789 Connecticut plans in our set with usable fee data.	$116.34 per participant
National medianAcross 54,783 published plans with usable fee data.	$122.17 per participant
Difference	$5.83 below the national median

Plan-paid means fees the plan itself reports on Schedule H; many employers pay providers directly, which a filing reports as $0. How to judge your own plan: are your 401(k) fees high?

Connecticut employers with a match dossier

These Connecticut-headquartered plans also file an SEC Form 11-K, so the employer’s match formula, vesting and eligibility are extracted on a company page.

Linde plc 401(k) match
Linde Retirement Savings Plan
The Hartford Insurance Group, Inc. 401(k) match
The Hartford Investment And Savings Plan

Useful links

All states
Plan counts, fees and largest plans, state by state.
The largest 401(k) plans in the US
The national ranking these state tables are drawn from.
Average 401(k) fees by plan size
Fees depend on plan size more than on state.

Cite: 401(k) Monitor, “Connecticut 401(k) plans: largest plans and fees”, computed from DOL EFAST2 Form 5500 bulk data, plan years 2021–2025, published set of 57,824 plans, data as of July 28, 2026.