As of November 7, 2026, Calumet Inc./DE is a publicly traded company (Nasdaq: CLMT). The largest holder reporting an active stake on Schedule 13D is The Heritage Group, at 16.56%. No bankruptcy or receivership appears in its SEC Form 8-K filings. Passive holders reporting on Schedule 13G include Two Seas Capital LP (7.5%), BlackRock (5.4%) (Schedule 13D/A, June 5, 2026).
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Is Calumet Inc./DE a real, registered company?
- Calumet Inc. files with the SEC under CIK 2013745 (its SEC filings).
- Its shares are listed under the ticker CLMT on Nasdaq (SEC company record).
- business address in Indianapolis, Indiana, as its SEC filings state.
- Court and bankruptcy records: see Before you sign or pay below.
Before you sign or pay
- Court and bankruptcy: No federal court case or bankruptcy filing found under Calumet Inc./DE in our court records and SEC 8-K records (as of 2026-11-07).
- Ownership: 5%+ holders are reported on Schedule 13D or 13G; the latest names Two Seas Capital LP (filed 2026-08-14).
Who are Calumet Inc./DE's owners and officers?
Calumet Inc./DE: business address in Indianapolis, Indiana; industry Petroleum Refining (Schedule 13G/A, 2026-08-14).
| Report | Holder | Share |
|---|---|---|
| Schedule 13G/A, 2026-08-14 | Wasserstein Management L.P. | 4.6% |
| Schedule 13G/A, 2026-08-14 | Two Seas Capital LP | 7.5% |
| Schedule 13D/A, 2026-06-05 | The Heritage Group | 16.56% |
| Schedule 13G/A, 2026-04-02 | Adams Asset Advisors, LLC | 4.7% |
| Schedule 13G/A, 2026-03-26 | The Vanguard Group | 0% |
| Schedule 13G/A, 2026-02-17 | Two Seas Capital LP | 9.3% |
| Schedule 13G/A, 2025-11-14 | Two Seas Capital LP | 7.8% |
| Schedule 13G, 2025-08-13 | Two Seas Capital LP | 5.2% |
| Schedule 13G, 2025-07-29 | The Vanguard Group | 5.38% |
| Schedule 13G, 2025-07-17 | Blackrock, Inc. | 5.4% |
Questions about who owns Calumet Inc./DE
Who owns Calumet Inc./DE?
On this page, 3 holders' latest ownership filings report 5% or more of Calumet Inc./DE: The Heritage Group (16.56%, Schedule 13D/A, filed 2026-06-05), Two Seas Capital LP (7.5%, Schedule 13G/A, filed 2026-08-14) and Blackrock, Inc. (5.4%, Schedule 13G, filed 2025-07-17).
Who are the largest shareholders of Calumet Inc./DE?
By the share each holder's latest filing reports, the largest holders of Calumet Inc./DE on this page are The Heritage Group (16.56%), Two Seas Capital LP (7.5%) and Blackrock, Inc. (5.4%).
When did The Heritage Group buy into Calumet Inc./DE?
The filings give report dates, not purchase dates. The earliest filing from The Heritage Group on this page is the Schedule 13D/A, filed 2026-06-05, reporting 16.56%. That earliest filing is itself an amendment, which updates an earlier report.
Is this an audit or a full list?
Neither. The ownership list on this page covers only Schedule 13D and 13G filings, which holders make once they own 5% or more of a class of shares (an amendment can report a stake that has since fallen below 5%); 10 such filings are shown here. It is not an audit and not a full cap table: holders who never reached 5% are not listed, and a stake can change after its latest filing.
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Who Pays Them, And Who They Are Up Against
Warning Bells
Sources
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Which insiders own Calumet Inc./DE shares?
Directors, officers and holders of 10% or more report their shares on Forms 3, 4 and 5. Each line is the latest such report, largest holding first.
- Heritage Group, a 10% owner: 13,323,185 shares (15.1% of shares outstanding), 12,440,211 held directly and 882,974 indirectly (Form 4, 2026-06-05).
- , a director: 943,438 shares (1.1% of shares outstanding) (Form 4, 2025-12-05).
- , the executive vice president - montana renewables: 615,201 shares (0.70% of shares outstanding) (Form 4, 2026-09-28).
- , a director: 394,632 shares (0.45% of shares outstanding) (Form 4, 2025-01-21).
- , a director: 348,410 shares (0.40% of shares outstanding) (Form 4, 2026-09-28).
Shares outstanding: 88,092,440 as of 2026-11-06, from the company's latest SEC cover page.
How much has Calumet Inc./DE raised?
No fundraising or offering filing from Calumet Inc./DE is on file with us.
Keep reading
More on Calumet Inc./DE and the records around it.
Calumet Inc./DE elsewhere on the record
- 5%+ stake filings Aug 2026
Companies that share a holder
- Two Seas Capital LP also filed stake reports on 14 other companies: NEKTAR THERAPEUTICS (Sep 2026), Quantum Corporation (Aug 2026), Sable Offshore Corp. (Aug 2026)
- BlackRock, Inc. also filed stake reports on 1596 other companies: AvePoint, Inc. (Nov 2026), BIOMARIN PHARMACEUTICAL INC (Nov 2026), MSG RANGERS CORP (Nov 2026)
- The Vanguard Group also filed stake reports on 2384 other companies: BellRing Brands, Inc. (Sep 2026), CAL-MAINE FOODS INC (Sep 2026), FTAI Aviation Ltd. (Sep 2026)
Related pages
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