As of November 6, 2026, Quanex Building Products Corporation is a publicly traded company (NYSE: NX). The largest holder reporting an active stake on Schedule 13D is Teleios Capital Partners GmbH, at 8.78%. No bankruptcy or receivership appears in its SEC Form 8-K filings. Passive holders reporting on Schedule 13G include Ameriprise (5.4%), Vanguard (5.12%) (Schedule 13D/A, October 26, 2026).
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Is Quanex Building Products Corporation a real, registered company?
- Quanex Building Products Corporation files with the SEC under CIK 1423221 (its SEC filings).
- Its shares are listed under the ticker NX on NYSE (SEC company record).
- Incorporated in Delaware; business address in Houston, Texas, 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 Quanex Building Products Corporation in our court records and SEC 8-K records (as of 2026-11-06).
- Ownership: 5%+ holders are reported on Schedule 13D or 13G; the latest names Teleios Capital Partners GmbH (filed 2026-10-26).
Who are Quanex Building Products Corporation's owners and officers?
Quanex Building Products Corporation: incorporated in Delaware; business address in Houston, Texas; industry Rolling Drawing & Extruding of Nonferrous Metals (Schedule 13D/A, 2026-10-26).
| Report | Holder | Share |
|---|---|---|
| Schedule 13D/A, 2026-10-26 | Teleios Capital Partners Gmbh | 8.78% |
| Schedule 13G/A, 2026-10-07 | Allspring Global Investments Holdings, LLC | 4.5% |
| Schedule 13G, 2026-04-30 | Vanguard Capital Management | 5.12% |
| Schedule 13G/A, 2026-04-14 | Allspring Global Investments Holdings, LLC | 5.9% |
| Schedule 13G/A, 2026-03-27 | The Vanguard Group | 0% |
| Schedule 13G, 2026-02-17 | Ameriprise Financial, Inc. | 5.4% |
| Schedule 13G/A, 2026-01-30 | The Vanguard Group | 8.98% |
Questions about who owns Quanex Building Products Corporation
Who owns Quanex Building Products Corporation?
On this page, 3 holders' latest ownership filings report 5% or more of Quanex Building Products Corporation: Teleios Capital Partners Gmbh (8.78%, Schedule 13D/A, filed 2026-10-26), Ameriprise Financial, Inc. (5.4%, Schedule 13G, filed 2026-02-17) and Vanguard Capital Management (5.12%, Schedule 13G, filed 2026-04-30).
Who are the largest shareholders of Quanex Building Products Corporation?
By the share each holder's latest filing reports, the largest holders of Quanex Building Products Corporation on this page are Teleios Capital Partners Gmbh (8.78%), Ameriprise Financial, Inc. (5.4%) and Vanguard Capital Management (5.12%).
When did Teleios Capital Partners Gmbh buy into Quanex Building Products Corporation?
The filings give report dates, not purchase dates. The earliest filing from Teleios Capital Partners Gmbh on this page is the Schedule 13D/A, filed 2026-10-26, reporting 8.78%. 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%); 7 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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The Short Answer
Which Company This Is
What They Do, And How The Money Works
Who Runs It, And How To Reach Them
The Money: Funding, Valuation, Runway
Who Pays Them, And Who They Are Up Against
Warning Bells
Sources
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Which insiders own Quanex Building Products Corporation 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.
- , a 10% owner: 4,421,879 shares (9.6% of shares outstanding), held indirectly (the form names the holder only in its footnotes), on a joint filing (Form 4, 2025-12-18).
- Teleios Global Opportunities Master Fund, Ltd., a 10% owner: 4,421,879 shares (9.6% of shares outstanding), held indirectly (the form names the holder only in its footnotes), on a joint filing (Form 4, 2025-12-18).
- Teleios Capital Partners GmbH, a 10% owner: 4,421,879 shares (9.6% of shares outstanding), held indirectly (the form names the holder only in its footnotes), on a joint filing (Form 4, 2025-12-18).
- , the chief executive and president: 347,294.44 shares (0.76% of shares outstanding) (Form 4, 2025-12-08).
- , the chief financial officer and senior vice president: 88,827 shares (0.19% of shares outstanding) (Form 4, 2025-12-08).
Shares outstanding: 45,826,208 as of 2026-08-28, from the company's latest SEC cover page.
How much has Quanex Building Products Corporation raised?
No fundraising or offering filing from Quanex Building Products Corporation is on file with us.
Keep reading
More on Quanex Building Products Corporation and the records around it.
Quanex Building Products Corporation elsewhere on the record
- 5%+ stake filings Oct 2026
Companies that share a holder
- Allspring Global Investments Holdings, LLC also filed stake reports on 49 other companies: abrdn Emerging Markets ex Chin (Oct 2026), AMC Global Media Inc (Oct 2026), EverQuote Inc (Oct 2026)
- Ameriprise Financial, Inc. also filed stake reports on 65 other companies: Universal Electronics Inc. (Sep 2026), America's Car-Mart, Inc. (Aug 2026), Ampco-Pittsburgh Corporation (Aug 2026)
- Vanguard Capital Management also filed stake reports on 1495 other companies: A10 Networks Inc (Oct 2026), Altisource Portfolio Solutions SA (Oct 2026), Alto Neuroscience Inc (Oct 2026)
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