As of November 6, 2026, 3 holders' latest Schedule 13D or 13G filings report owning 5% or more of Quanex Building Products Corporation. The largest reported stake is Teleios Capital Partners GmbH's, at 8.78%. 7 filings are on record since January 30, 2026 (Schedule 13D/A, October 26, 2026).
Who owns Quanex Building Products Corporation?
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Key facts
- · Reporting person: Teleios Capital Partners GmbH · Sole voting: 0 · Shared voting: 4,022,113 · Sole dispositive: 0 · Shared dispositive: 4,022,113 · SCHEDULE 13D/A, 2026-10-26
- · Reporting person: Allspring Global Investments Holdings, LLC · Sole voting: 2,064,453 · Shared voting: 0 · Sole dispositive: 2,065,713 · Shared dispositive: 0 · SCHEDULE 13G/A, 2026-10-07
- · Holder: Vanguard Capital Management · Percent: 5.12% · SCHEDULE 13G
- · Holder: Allspring Global Investments Holdings, LLC · Percent: 5.9% · SCHEDULE 13G/A
- · Holder: The Vanguard Group · Percent: 0% · SCHEDULE 13G/A
Quanex Building Products Corporation has 7 Schedule 13D or 13G filings on record since 2026-01-30. 3 holders' latest filing reports 5% or more of common stock, par value $0.01 per share (the "shares"). Each figure below is the holder's own, as filed, with the filing linked.
Holders
| Holder | Percent | Shares | Latest | Event date |
|---|---|---|---|---|
| Teleios Capital Partners GmbH | 8.78% | 4,022,113 | SCHEDULE 13D/A, 2026-10-26 | 2026-10-22 |
| Ameriprise Financial, Inc. | 5.4% | 2,453,837 | SCHEDULE 13G, 2026-02-17 | 2025-12-31 |
| Vanguard Capital Management | 5.12% | 2,351,909 | SCHEDULE 13G, 2026-04-30 | 2026-03-31 |
| Allspring Global Investments Holdings, LLC | 4.5% | 2,065,713 | SCHEDULE 13G/A, 2026-10-07 | 2026-09-30 |
| The Vanguard Group | 0% | 0 | SCHEDULE 13G/A, 2026-03-27 | 2026-03-13 |
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More on Quanex Building Products Corporation and the records around it.
Quanex Building Products Corporation elsewhere on the record
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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Voting and dispositive power, as filed
| Reporting person | Sole voting | Shared voting | Sole dispositive | Shared dispositive | Filing |
|---|---|---|---|---|---|
| Teleios Capital Partners GmbH | 0 | 4,022,113 | 0 | 4,022,113 | SCHEDULE 13D/A, 2026-10-26 |
| Teleios Global Opportunities Master Fund, Ltd. | 0 | 4,022,113 | 0 | 4,022,113 | SCHEDULE 13D/A, 2026-10-26 |
| Igor Kuzniar | 0 | 4,022,113 | 0 | 4,022,113 | SCHEDULE 13D/A, 2026-10-26 |
| Allspring Global Investments Holdings, LLC | 2,064,453 | 0 | 2,065,713 | 0 | SCHEDULE 13G/A, 2026-10-07 |
The latest filing identifies Quanex Building Products Corporation by CUSIP 747619104 and gives its principal executive office as 945 BUNKER HILL RD, SUITE 900, HOUSTON, TX 77024 (SCHEDULE 13D/A, 2026-10-26).
Source of funds (Item 3)
The funds for the purchase of the 4,022,113 Shares beneficially owned by Teleios came from the working capital of the Master Fund, of which Teleios serves as investment manager. The net investment costs (including commissions, if any) of the Shares beneficially owned by Teleios is approximately $87,249,509. No borrowed funds were used to purchase the Shares, other than any borrowed funds used for working capital purposes in the ordinary course of business. The funds for the purchase of the 4,022,113 Shares beneficially owned by the Master Fund came from the working capital of the Master Fund.Teleios Capital Partners GmbH, SCHEDULE 13D/A, 2026-10-26
Purpose of Transaction (Item 4)
Teleios Capital Partners GmbH
The Reporting Persons have engaged in dialogue with the Issuer's management and board of directors and may from time to time continue such discussions regarding, amongst other matters, capital allocation, strategy, and governance, with a view to enhancing shareholder value. The Reporting Persons previously held a board observer seat on the board of the Issuer pursuant to a Board Observer Agreement; however, the Board Observer Agreement terminated, and the Reporting Persons no longer have any board observer rights with respect to the Issuer. Except as otherwise set forth herein, the Reporting Persons do not have any present plans or proposals which would relate to, or result in, the matters set forth in subparagraphs (a) - (j) of Item 4 of Schedule 13D. The Reporting Persons reserve the right, at a later date, to effect one or more of such changes or transactions in the number of Shares they may be deemed to beneficially own.Item 4 of the SCHEDULE 13D/A filed 2026-10-26
Timeline
| Filed | Holder | Percent | Filing |
|---|---|---|---|
| 2026-01-30 | The Vanguard Group | 8.98% | SCHEDULE 13G/A |
| 2026-02-17 | Ameriprise Financial, Inc. | 5.4% | SCHEDULE 13G |
| 2026-03-27 | The Vanguard Group | 0% | SCHEDULE 13G/A |
| 2026-04-14 | Allspring Global Investments Holdings, LLC | 5.9% | SCHEDULE 13G/A |
| 2026-04-30 | Vanguard Capital Management | 5.12% | SCHEDULE 13G |
| 2026-10-07 | Allspring Global Investments Holdings, LLC | 4.5% | SCHEDULE 13G/A |
| 2026-10-26 | Teleios Capital Partners GmbH | 8.78% | SCHEDULE 13D/A |
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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Where this comes from
Anyone who comes to own more than 5% of a class of a listed company's voting shares has to tell the SEC. A holder who may seek to change or influence the company files Schedule 13D, and has to say in Item 4, "Purpose of Transaction", what it intends to do. A holder with no such intent, such as many index and passive funds, may file the shorter Schedule 13G. Both are amended when the stake changes, including when it falls below 5%.
Every row here is one of those filings, linked to the filing itself. Percentages and share counts are exactly as the holder filed them, for the holder the filing names; an amendment showing a lower figure is shown as filed. Item 4 text is quoted word for word. Where a 13D's Item 4 contains a sentence stating a definite intent to influence the company, that sentence is marked and quoted; the page does not describe the holder or its motives beyond the words it filed. Nothing here is investment advice.