401(k) · DOL Form 5500 · 2023

Ironwood Pharmaceuticals, Inc. 401(k) Plan

Data updated 2026-08-25

$79M
Total assets Below avg plan size
219
Participants Below avg headcount
90th
Percentile by assets National rank
$358,617
Avg per participant High balance/head
PlainRetire home → About this data RSS: change history

Official DOL plan name: Ironwood Pharmaceuticals, Inc. 401(k) Savings Plan · Sponsored by Ironwood Pharmaceuticals, Inc. · Massachusetts · Professional & Technical Services

$79M in assets, 219 participants

Ironwood Pharmaceuticals, Inc.'s Ironwood Pharmaceuticals, Inc. 401(k) Savings Plan reported $79M in total assets and 219 participants in its 2023 DOL Form 5500 filing, ranking in the 90th 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.

  • #18,453 in Professional & Technical Services (20,321 peers)

Coverage in Massachusetts

Ironwood Pharmaceuticals, Inc. 401(k) Savings Plan covers 219 participants in Massachusetts, about 33% of the average Massachusetts filer (state average ~659 per filing). Assets: $79M.

#18,453
in Professional & Technical Services (20,321 peers)
+13.0%
assets growth YoY
0.8×
vs typical plan assets (national mean)

Ironwood Pharmaceuticals, Inc. 401(k) Savings Plan's outsized position by total assets

Ironwood Pharmaceuticals, Inc. 401(k) Savings Plan vs every filed plan by assets

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

$78,537,223 Top 10% higher than 90% 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

Ironwood Pharmaceuticals, Inc. 401(k) Savings 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. Ironwood Pharmaceuticals, Inc. 401(k) Savings Plan sits mid-pack in the medium band (219 participants).

What changed between DOL Form 5500 filings

plan year 2022 → plan year 2023

  • Ironwood Pharmaceuticals, Inc. 401(k) Savings Plan reported net income rose from -$16M in the plan year 2022 filing to $9M in the plan year 2023 filing.
  • Ironwood Pharmaceuticals, Inc. 401(k) Savings Plan end-of-year assets rose from $69M in the plan year 2022 filing to $79M in the plan year 2023 filing.

See the national 2022→2023 release diff →

EBSA filing schedule strip

Filing strip 043404176 · Ironwood Pharmaceuticals, Inc. PY 2023 · 401(k)

Ironwood Pharmaceuticals, Inc. 401(k) Savings Plan · $79M · 219 · 90th

  • BOY $79M
  • SCH 219
  • EBSA 90th
  • PART 401(k)
  • TYPE near William a. Hazel, Inc. 401(k) Incentive and Savings Plan
  • NET ind #18453

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 →

Ironwood Pharmaceuticals, Inc. 401(k) Savings Plan in the asset neighbourhood

Bryant & Stratton 401(k) Savings PlanBryant & Stratton 401(k) Sav…$79MHog Slat, Inc. Retirement Savings PlanHog Slat, Inc. Retirement Sa…$79MWilliam a. Hazel, Inc. 401(k) Incentive and Savings PlanWilliam a. Hazel, Inc. 401(k…$79MIronwood Pharmaceuticals, Inc. 401(k) Savings PlanIronwood Pharmaceuticals, In…$79MHometrust Bank Ksop Plan$78M
End-of-year total assets ($M) among Ironwood Pharmaceuticals, Inc. 401(k) Savings Plan and nearest nationwide 401(k) peers. Source: DOL Form 5500 plan year 2023.

Massachusetts filing particulars

Total Assets (Beginning of Year)$69M
Net Assets (End of Year)$79M
Net Income$9M
Employer EIN043404176
Plan Effective Date1999-01-01
Filing StatusFILING RECEIVED

Sponsor Plan History (Ironwood Pharmaceuticals, Inc.)

Sponsor-wide plan assets over time

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

Latest sponsor-wide plan assets
$88M 26.37423498791993% vs 2022
2024 filing year
$60M$70M$80M$90M 202220232024 $69.5M $87.8M ▲ +26.4%
Year Plans Participants Total Assets
2022 1 220 $69M
2023 1 219 $79M
2024 1 216 $88M

Nearby 401(k) Plans in Massachusetts

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

Ironwood Pharmaceuticals, Inc. 401(k) Savings Plan vs. nearby 401(k) plans in Massachusetts, assets vs. participants Scatter plot of 6 data points. -20000020000400006000080000 -10010203040 Total assets ($B) Participants Ironwood Pharmaceuticals, Inc. 401(k) Savings Plan, Total assets ($B): 0.078537223 · Participants: 219Ironwood Pharmaceuticals, Inc. 401(k) Savings 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
Ironwood Pharmaceuticals, Inc. 401(k) Savings Plan vs. nearby 401(k) plans in Massachusetts, assets vs. participants
Compare Ironwood Pharmaceuticals, Inc. 401(k) Savings Plan side-by-side with 3 peers →

Ironwood Pharmaceuticals, Inc. 401(k) Savings Plan's out-of-state 401(k) peers by assets and headcount

Outside Massachusetts, the nearest 401(k) by assets is William a. Hazel, Inc. 401(k) Incentive and Savings Plan in VA ($79M); by covered participants it is Raven Industries, Inc. 401(k) Plan in SD (219 participants). Same-state nearby plans are listed separately above.

Closest by plan assets

Nearest other-state filings by tot_assets_eoy ($79M here).

Similar participant headcount

Nearest other-state filings by covered participants (219 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 Ironwood Pharmaceuticals, Inc. 401(k) Savings Plan assets move in 2023? ▼
Ironwood Pharmaceuticals, Inc. 401(k) Savings Plan grew at a solid clip - up 13.0% during 2023, from $69M to $79M. Reported net income was $9M.
How have Ironwood Pharmaceuticals, Inc. plan assets changed over time? ▼
Across 3 plan years on file (2022-2024), Ironwood Pharmaceuticals, Inc.'s sponsor-wide assets grew 26.4%, from $69M to $88M.
Where does Ironwood Pharmaceuticals, Inc. 401(k) Savings Plan rank by assets among Form 5500 filers? ▼
Ironwood Pharmaceuticals, Inc. 401(k) Savings Plan ranks in the 90th 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 Ironwood Pharmaceuticals, Inc. 401(k) Savings Plan? ▼
Among 401(k) plans in other states, the closest by assets is William a. Hazel, Inc. 401(k) Incentive and Savings Plan in VA ($79M, 622 participants).
Which 401(k) plans cover a similar participant headcount to Ironwood Pharmaceuticals, Inc. 401(k) Savings Plan? ▼
Among 401(k) plans in other states, the closest by covered participants is Raven Industries, Inc. 401(k) Plan in SD (219 participants, N/A 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 043404176.

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.