401(k) · DOL Form 5500 · 2022

Diamond Offshore Management Company 401(k) Plan

Data updated 2026-08-25

$319M
Total assets Above avg plan size
1,043
Participants Near avg headcount
97th
Percentile by assets National rank
$306,223
Avg per participant High balance/head
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Official DOL plan name: Diamond Offshore 401(k) Plan · Sponsored by Diamond Offshore Management Company · Texas · Mining & Oil Extraction

$319M in assets, 1,043 participants

Diamond Offshore Management Company's Diamond Offshore 401(k) Plan reported $319M in total assets and 1,043 participants in its 2022 DOL Form 5500 filing, ranking in the 97th 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.

  • #841 in Mining & Oil Extraction (892 peers)

Where Diamond Offshore 401(k) Plan sits by assets

Diamond Offshore 401(k) Plan sits in the top 5% of all filed plans by assets, $319M for 1,043 participants (~$306,223/participant), down 24.1% in 2022.

#841
in Mining & Oil Extraction (892 peers)
-24.1%
assets change YoY
3.2×
vs typical plan assets (national mean)

The plan reported a net loss of $101M for the year, a single-year figure driven by markets and benefit payments, not a measure of plan health.

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

Diamond Offshore 401(k) Plan vs every filed plan by assets

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

$319,390,915 Top 3% higher than 97% 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

Diamond Offshore 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. Diamond Offshore 401(k) Plan lands in the large band (1,043 participants).

Published 5500 schedule card

Filing strip 133560049 · Diamond Offshore Management Company PY 2022 · 401(k)

Diamond Offshore 401(k) Plan · $319M · 1,043 · 97th

  • EBSA $319M
  • PART 1,043
  • TYPE 97th
  • NET 401(k)
  • BOOK near Macallister Profit Sharing & Savings Plan
  • VS-ST ind #841

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 Mining & Oil Extraction retirement plans → · Plans in Texas →

Diamond Offshore 401(k) Plan in the asset neighbourhood

Gordon Rees Scully Mansukhani, LLP 401(k) Retirement PlanGordon Rees Scully Mansukhan…$320MMacallister Profit Sharing & Savings PlanMacallister Profit Sharing &…$319MDiamond Offshore 401(k) Plan$319MNapa Management Services Corp. Clinical Ees P/S Pl Profit Sharing Plan & TrustNapa Management Services Cor…$319MSutter Home Winery, Inc. 401(k) and Profit Sharing PlanSutter Home Winery, Inc. 401…$319M
End-of-year total assets ($M) among Diamond Offshore 401(k) Plan and nearest nationwide 401(k) peers. Source: DOL Form 5500 plan year 2022.

Scale-class filing particulars (2022)

Total Assets (Beginning of Year)$421M
Net Assets (End of Year)$319M
Net Income-$101M
Employer EIN133560049
Plan Effective Date1989-07-01
Filing StatusFILING RECEIVED

Sponsor Plan History (Diamond Offshore Management Company)

Sponsor-wide plan assets over time

All Diamond Offshore Management Company plans reported in each filing year

Latest sponsor-wide plan assets
$377M 18.17211394381709% vs 2022
2024 filing year
$300M$320M$340M$360M$380M$400M 202220232024 $319M $377M ▲ +18.2%
Year Plans Participants Total Assets
2022 1 1,043 $319M
2023 1 1,183 $356M
2024 1 1,272 $377M

Nearby 401(k) Plans in Texas

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

Diamond Offshore 401(k) Plan vs. nearby 401(k) plans in Texas, assets vs. participants Scatter plot of 6 data points. -50000050000100000150000200000 -10010203040 Total assets ($B) Participants Diamond Offshore 401(k) Plan, Total assets ($B): 0.319390915 · Participants: 1043Diamond Offshore 401(k) PlanAT&T Retirement Savings Plan, Total assets ($B): 37.578871 · Participants: 144503AT&T Retirement Savings PlanExxonmobil Savings Plan, Total assets ($B): 21.266 · Participants: 23619Exxonmobil Savings PlanCaterpillar 401(k) Savings Plan, Total assets ($B): 13.794958016 · Participants: 38538Caterpillar 401(k) Savings PlanAmerican Airlines, Inc. 401(k) Plan, Total assets ($B): 12.806443202 · Participants: 85577American Airlines, Inc. 401(k) PlanDell Inc. 401(k) Plan, Total assets ($B): 11.969059 · Participants: 47532Dell Inc. 401(k) Plan
Diamond Offshore 401(k) Plan vs. nearby 401(k) plans in Texas, assets vs. participants
Compare Diamond Offshore 401(k) Plan side-by-side with 3 peers →

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

Outside Texas, the nearest 401(k) by assets is Macallister Profit Sharing & Savings Plan in IN ($319M); by covered participants it is Drive Devilbiss Healthcare 401(k) Plan in NY (1,043 participants). Same-state nearby plans are listed separately above.

Similar participant headcount

Nearest other-state filings by covered participants (1,043 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 Diamond Offshore 401(k) Plan assets move in 2022? ▼
Diamond Offshore 401(k) Plan declined sharply - down 24.1% during 2022, from $421M to $319M. Reported net income was -$101M.
How have Diamond Offshore Management Company plan assets changed over time? ▼
Across 3 plan years on file (2022-2024), Diamond Offshore Management Company's sponsor-wide assets grew 18.2%, from $319M to $377M.
Where does Diamond Offshore 401(k) Plan rank by assets among Form 5500 filers? ▼
Diamond Offshore 401(k) Plan ranks in the 97th 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 Diamond Offshore 401(k) Plan? ▼
Among 401(k) plans in other states, the closest by assets is Macallister Profit Sharing & Savings Plan in IN ($319M, 1,830 participants).
Which 401(k) plans cover a similar participant headcount to Diamond Offshore 401(k) Plan? ▼
Among 401(k) plans in other states, the closest by covered participants is Drive Devilbiss Healthcare 401(k) Plan in NY (1,043 participants, $58M 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 133560049.

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.