401(k) · DOL Form 5500 · 2022

Alexion Pharmaceuticals, Inc. 401(k) Plan

Data updated 2026-08-25

$462M
Total assets Above avg plan size
2,372
Participants Above avg headcount
98th
Percentile by assets National rank
$194,934
Avg per participant Above avg balance/head
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Official DOL plan name: Alexion 401(k) Plan · Sponsored by Alexion Pharmaceuticals, Inc. · Massachusetts · Professional & Technical Services

$462M in assets, 2,372 participants

Alexion Pharmaceuticals, Inc.'s Alexion 401(k) Plan reported $462M in total assets and 2,372 participants in its 2022 DOL Form 5500 filing, ranking in the 98th 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.

  • #21,236 in Professional & Technical Services (21,562 peers)

Coverage in Massachusetts

Alexion 401(k) Plan covers 2,372 participants in Massachusetts, 3.6x the typical Massachusetts plan (state average ~659 per filing). Assets: $462M.

#21,236
in Professional & Technical Services (21,562 peers)
-9.8%
assets change YoY
4.6×
vs typical plan assets (national mean)

The plan reported a net loss of $50M for the year, a single-year figure driven by markets and benefit payments, not a measure of plan health.

Alexion 401(k) Plan's outsized position by total assets

Alexion 401(k) Plan vs every filed plan by assets

End-of-year total assets · plan year 2022 · DOL Form 5500

$462,383,208 Top 2% higher than 98% of 139,123 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 2022

Alexion 401(k) Plan's large-plan peer group by participant headcount

Plan-year 2022 Form 5500 filings with a reported participant count, partitioned by headcount band, not by assets. Alexion 401(k) Plan lands in the large band (2,372 participants).

Form 5500 schedule snapshot

Filing strip 854136092 · Alexion Pharmaceuticals, Inc. PY 2022 · 401(k)

Alexion 401(k) Plan · $462M · 2,372 · 98th

  • TYPE $462M
  • TYPE 2,372
  • TYPE 98th
  • TYPE 401(k)
  • TYPE near Mccarthy Employee Retirement Savings Plan
  • TYPE ind #21236

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 Professional & Technical Services retirement plans → · Plans in Massachusetts →

Alexion 401(k) Plan in the asset neighbourhood

South State Bank 401(k) Retirement Savings PlanSouth State Bank 401(k) Reti…$463MEpic Games, Inc. 401(k) Plan and TrustEpic Games, Inc. 401(k) Plan…$463MPlexus Corp. 401(k) Retirement PlanPlexus Corp. 401(k) Retireme…$463MAlexion 401(k) Plan$462MMccarthy Employee Retirement Savings PlanMccarthy Employee Retirement…$462M
End-of-year total assets ($M) among Alexion 401(k) Plan and nearest nationwide 401(k) peers. Source: DOL Form 5500 plan year 2022.

Massachusetts filing particulars

Total Assets (Beginning of Year)$513M
Net Assets (End of Year)$462M
Net Income-$50M
Employer EIN854136092
Plan Effective Date1993-08-01
Filing StatusFILING RECEIVED

Sponsor Plan History (Alexion Pharmaceuticals, Inc.)

Sponsor-wide plan assets over time

All Alexion Pharmaceuticals, Inc. plans reported in each filing year

Latest sponsor-wide plan assets
N/A
2023 filing year
$0M$200M$400M$600M 20222023 $462M $0M ▼ -100.0%
Year Plans Participants Total Assets
2022 1 2,372 $462M
2023 1 2,509 N/A

Nearby 401(k) Plans in Massachusetts

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

Alexion 401(k) Plan vs. nearby 401(k) plans in Massachusetts, assets vs. participants Scatter plot of 6 data points. -200000200004000060000 -50510152025 Total assets ($B) Participants Alexion 401(k) Plan, Total assets ($B): 0.462383208 · Participants: 2372Alexion 401(k) PlanFidelity Retirement Savings Plan, Total assets ($B): 22.953563448 · Participants: 52036Fidelity Retirement Savings PlanLiberty Mutual 401(k) Plan, Total assets ($B): 8.79802945 · Participants: 32843Liberty Mutual 401(k) PlanMassachusetts Institute of Technology Supplemental 401(k) Plan, Total assets ($B): 5.810585521 · Participants: 13690Massachusetts Institute of Technology Supplemental 401(k) PlanPhilips North America 401(k) Plan, Total assets ($B): 5.180251859 · Participants: 19750Philips North America 401(k) PlanBoston Scientific Corporation 401(k) Retirement Savings Plan, Total assets ($B): 4.853752256 · Participants: 18359Boston Scientific Corporation 401(k) Retirement Savings Plan
Alexion 401(k) Plan vs. nearby 401(k) plans in Massachusetts, assets vs. participants
Compare Alexion 401(k) Plan side-by-side with 3 peers →

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

Outside Massachusetts, the nearest 401(k) by assets is Mccarthy Employee Retirement Savings Plan in MO ($462M); by covered participants it is Wb Frozen US, LLC 401(k) Plan in IN (2,372 participants). Same-state nearby plans are listed separately above.

Closest by plan assets

Nearest other-state filings by tot_assets_eoy ($462M here).

Similar participant headcount

Nearest other-state filings by covered participants (2,372 participants); asset peers above are excluded.

DOL Form 5500 plan year 2022. Asset totals can differ widely at the same headcount; neither axis is a quality rating.

Frequently Asked Questions

How did Alexion 401(k) Plan assets move in 2022? ▼
Alexion 401(k) Plan pulled back noticeably - down 9.8% during 2022, from $513M to $462M. Reported net income was -$50M.
Where does Alexion 401(k) Plan rank by assets among Form 5500 filers? ▼
Alexion 401(k) Plan ranks in the 98th percentile by end-of-year assets among 139,126 plans that reported assets for plan year 2022 (in the top 5% of all filed plans by assets).
Which 401(k) plans are similar in size to Alexion 401(k) Plan? ▼
Among 401(k) plans in other states, the closest by assets is Mccarthy Employee Retirement Savings Plan in MO ($462M, 4,297 participants).
Which 401(k) plans cover a similar participant headcount to Alexion 401(k) Plan? ▼
Among 401(k) plans in other states, the closest by covered participants is Wb Frozen US, LLC 401(k) Plan in IN (2,372 participants, $59M in assets).

Source: U.S. Department of Labor, Employee Benefits Security Administration (EBSA), Form 5500 public disclosure dataset. Plan year 2022.

Source: DOL EFAST2 filing system (efast.dol.gov) - original filing retrieval by EIN 854136092.

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.