401(k) · DOL Form 5500 · 2023

Amylyx Pharmaceuticals Inc. 401(k) Plan

Data updated 2026-08-25

$19M
Total assets Small plan by assets: 221
Participants Below avg headcount: 71st
Percentile by assets National rank: $83,722
Avg per participant Below avg balance/head

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Official DOL plan name: Amylyx Pharmaceuticals Retirement Plan · Sponsored by Amylyx Pharmaceuticals Inc. · Massachusetts · Manufacturing

$19M in assets, 221 participants

Amylyx Pharmaceuticals Inc.'s Amylyx Pharmaceuticals Retirement Plan reported $19M in total assets and 221 participants in its 2023 DOL Form 5500 filing, ranking in the 71st 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.

#11,353 in Manufacturing (18,722 peers)

Coverage in Massachusetts

Amylyx Pharmaceuticals Retirement Plan covers 221 participants in Massachusetts, about 34% of the average Massachusetts filer (state average ~659 per filing). Assets: $19M.

#11,353
in Manufacturing (18,722 peers): +135.9%
assets growth YoY

Amylyx Pharmaceuticals Retirement Plan's outsized position by total assets

Amylyx Pharmaceuticals Retirement Plan vs every filed plan by assets

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

$18,502,622 Top 29% higher than 71% 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

Amylyx Pharmaceuticals Retirement 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. Amylyx Pharmaceuticals Retirement Plan sits mid-pack in the medium band (221 participants).

Micro (1-10) 35,718 filings (27%) Small (11-100) 27,089 filings (21%) Medium (101-1,000) 55,445 filings (43%) Large (1,001-10,000) 10,273 filings (8%) Mega (10,000+) 1,374 filings (1%)

Plan-year Form 5500 strip

Filing strip 464600503 · Amylyx Pharmaceuticals Inc. PY 2023 · 401(k)

Amylyx Pharmaceuticals Retirement Plan · $19M · 221 · 71st

PCT $19M
PCT 221
PCT 71st
PCT 401(k)
PCT near Naval Systems, Inc 401(k) Plan
PCT ind #11353

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 Manufacturing retirement plans → · Plans in Massachusetts →

End-of-year total assets ($M) among Amylyx Pharmaceuticals Retirement Plan and nearest nationwide 401(k) peers. Source: DOL Form 5500 plan year 2023.

Massachusetts filing particulars

Total Assets (Beginning of Year)	$8M
Net Assets (End of Year)	$19M
Net Income	$11M
Employer EIN	464600503
Plan Effective Date	2021-03-01
Filing Status	FILING RECEIVED

Sponsor Plan History (Amylyx Pharmaceuticals Inc.)

Latest sponsor-wide plan assets: $19M 1.390916379310997% vs 2023; 2024 filing year

Year	Plans	Participants	Total Assets
2023	1	221	$19M
2024	1	328	$19M

Nearby 401(k) Plans in Massachusetts

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

Amylyx Pharmaceuticals Retirement 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 Amylyx Pharmaceuticals Retirement Plan side-by-side with 3 peers →

Amylyx Pharmaceuticals Retirement Plan's out-of-state 401(k) peers by assets and headcount

Outside Massachusetts, the nearest 401(k) by assets is Naval Systems, Inc 401(k) Plan in MD ($19M); by covered participants it is Skin Cancer and Cosmetic Dermatology 401(k) Plan a in GA (221 participants). Same-state nearby plans are listed separately above.

Closest by plan assets

Nearest other-state filings by tot_assets_eoy ($19M here).

Naval Systems, Inc 401(k) Plan (MD) $19M · 336
Auburn Gear, LLC 401(k) Plan (IN) $19M · 156
California Supply, Inc. 401(k) Profit Sharing Plan (CA) $19M · 89
H&h Automotive Profit Sharing Plan (NE) $19M · 474

Similar participant headcount

Nearest other-state filings by covered participants (221 participants); asset peers above are excluded.

Skin Cancer and Cosmetic Dermatology 401(k) Plan a (GA) 221 · 0 off
Paulas Choice Retirement Savings Plan (WA) 221 · 0 off
Manasquan Bank 401(k) Plan (NJ) 221 · 0 off
Summit on-Site Solutions 401(k) Plan (TX) 221 · 0 off

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 Amylyx Pharmaceuticals Retirement Plan assets move in 2023? ▼

Amylyx Pharmaceuticals Retirement Plan surged - up 135.9% during 2023, from $8M to $19M. Reported net income was $11M.

How have Amylyx Pharmaceuticals Inc. plan assets changed over time? ▼

Across 2 plan years on file (2023-2024), Amylyx Pharmaceuticals Inc.'s sponsor-wide assets grew 1.4%, from $19M to $19M.

Which 401(k) plans are similar in size to Amylyx Pharmaceuticals Retirement Plan? ▼

Among 401(k) plans in other states, the closest by assets is Naval Systems, Inc 401(k) Plan in MD ($19M, 336 participants).

Which 401(k) plans cover a similar participant headcount to Amylyx Pharmaceuticals Retirement Plan? ▼

Among 401(k) plans in other states, the closest by covered participants is Skin Cancer and Cosmetic Dermatology 401(k) Plan a in GA (221 participants, $3M 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 464600503.