Quanex: Teleios reports 8.78% ownership stake

All transactions in Quanex shares reported for the preceding 60 days were open-market transactions.

Rhea-AI Filing Summary

Quanex Building Products Corporation (NX) is the subject of an amended report in which Teleios Capital Partners GmbH, the investment manager, Teleios Global Opportunities Master Fund, Ltd., and Igor Kuzniar, Teleios’s Managing Member, each may be deemed beneficial owners of the same 4,022,113 common shares, or 8.78% of the class. They reported shared voting and dispositive power over those shares. The percentage is based on 45,826,208 shares outstanding as of the date of the statement.

The shares were received in exchange for Tyman shares in connection with Quanex’s acquisition of Tyman; the reported net investment cost was approximately $87,249,509. The reporting persons have discussed capital allocation, strategy, and governance with Quanex’s management and board and may continue those discussions. Their Board Observer Agreement terminated, and they no longer have board observer rights.

Key Figures

Beneficial ownership: 4,022,113 shares Ownership percentage: 8.78% Shares outstanding: 45,826,208 shares +1 more

4 metrics

Beneficial ownership 4,022,113 shares The same shares were reported by Teleios Capital Partners GmbH, Teleios Global Opportunities Master Fund, Ltd., and Igor Kuzniar, with shared voting and dispositive power.

Ownership percentage 8.78% Percentage of Quanex common shares beneficially owned, based on 45,826,208 shares outstanding as of the date of the statement.

Shares outstanding 45,826,208 shares As of the date of the statement.

Net investment cost Approximately $87,249,509 Reported for the shares, including commissions, if any.

Key Terms

beneficial owner, shared voting power, shared dispositive power, Board Observer Agreement, +1 more

5 terms

beneficial owner regulatory

"may be deemed to be the beneficial owner of 4,022,113 Shares"

A beneficial owner is the person who ultimately owns or controls a financial asset or property, even if their name isn't directly on official documents. Think of it like someone who secretly holds the keys to a safe deposit box—others may appear to have access, but the true owner is the one who benefits from what's inside. Identifying beneficial owners helps ensure transparency and prevent illegal activities like money laundering or fraud.

shared voting power regulatory

"Shared Voting Power 4,022,113.00"

Shared voting power occurs when two or more parties jointly have the right to vote or decide how a block of company shares is cast, like co-owners who must agree before moving a piece of furniture. Investors care because who controls voting rights affects board elections, major corporate decisions and takeover outcomes, and shared control can alter regulatory disclosures and the practical influence any holder has over a company’s direction and value.

shared dispositive power regulatory

"Shared Dispositive Power 4,022,113.00"

Board Observer Agreement regulatory

"the Board Observer Agreement terminated"

open-market transactions financial

"were open-market transactions"

Open-market transactions are purchases or sales of a company’s securities that take place on public exchanges rather than through private agreements. They matter to investors because these trades change the number of shares available, can move the stock price, and often signal management’s view of the company’s value—like a store restocking or clearing shelves, altering supply and the price shoppers see.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

How many NX shares do Teleios and Igor Kuzniar report owning?

Teleios Capital Partners GmbH, Teleios Global Opportunities Master Fund, Ltd., and Igor Kuzniar each reported beneficial ownership of 4,022,113 shares, equal to 8.78% of Quanex’s common stock. The reports describe the same shares, with shared voting and dispositive power.

How did Teleios acquire Quanex shares?

The reporting persons received Quanex voting securities in exchange for Tyman shares in connection with Quanex’s acquisition of Tyman.

Were recent NX share transactions open-market transactions?

Yes. All transactions in Quanex shares reported by the reporting persons during the past 60 days were open-market transactions.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 10/26/2026 - 08:51 PM EDT Accepted by SEC EDGAR 10/26/2026 - 08:51 PM EDT Learn about SEC filing dates

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13D

Under the Securities Exchange Act of 1934

(Amendment No. 2)

Quanex Building Products Corporation

(Name of Issuer)

Common Stock, par value $0.01 per share (the "Shares")

(Title of Class of Securities)

747619104

(CUSIP Number)

Teleios Capital Partners GmbH
BAARERSTRASSE 12,
ZUG, V8, 6300
41 41 506 56 59

(Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications)

10/22/2026

(Date of Event Which Requires Filing of This Statement)

If the filing person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because of §§ 240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the following box.

The information required on the remainder of this cover page shall not be deemed to be "filed" for the purpose of Section 18 of the Securities Exchange Act of 1934 ("Act") or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

schemaVersion:

SCHEDULE 13D

CUSIP Number(s): 747619104

1

Name of reporting person

Teleios Capital Partners GmbH

2

Check the appropriate box if a member of a Group (See Instructions)

(a)
(b)

3

SEC use only

4

Source of funds (See Instructions)

AF

5

Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)

6

Citizenship or place of organization

SWITZERLAND

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 0.00
8	Shared Voting Power 4,022,113.00
9	Sole Dispositive Power 0.00
10	Shared Dispositive Power 4,022,113.00

11

Aggregate amount beneficially owned by each reporting person

4,022,113.00

12

Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)

13

Percent of class represented by amount in Row (11)

8.78 %

14

Type of Reporting Person (See Instructions)

IA, OO

SCHEDULE 13D

CUSIP Number(s): 747619104

1

Name of reporting person

Teleios Global Opportunities Master Fund, Ltd.

2

Check the appropriate box if a member of a Group (See Instructions)

(a)
(b)

3

SEC use only

4

Source of funds (See Instructions)

AF

5

Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)

6

Citizenship or place of organization

CAYMAN ISLANDS

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 0.00
8	Shared Voting Power 4,022,113.00
9	Sole Dispositive Power 0.00
10	Shared Dispositive Power 4,022,113.00

11

Aggregate amount beneficially owned by each reporting person

4,022,113.00

12

Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)

13

Percent of class represented by amount in Row (11)

8.78 %

14

Type of Reporting Person (See Instructions)

CO

SCHEDULE 13D

CUSIP Number(s): 747619104

1

Name of reporting person

Igor Kuzniar

2

Check the appropriate box if a member of a Group (See Instructions)

(a)
(b)

3

SEC use only

4

Source of funds (See Instructions)

AF

5

Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)

6

Citizenship or place of organization

SWITZERLAND

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 0.00
8	Shared Voting Power 4,022,113.00
9	Sole Dispositive Power 0.00
10	Shared Dispositive Power 4,022,113.00

11

Aggregate amount beneficially owned by each reporting person

4,022,113.00

12

Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)

13

Percent of class represented by amount in Row (11)

8.78 %

14

Type of Reporting Person (See Instructions)

IN, HC

SCHEDULE 13D

Item 1.	Security and Issuer
(a)	Title of Class of Securities: Common Stock, par value $0.01 per share (the "Shares")
(b)	Name of Issuer: Quanex Building Products Corporation
(c)	Address of Issuer's Principal Executive Offices: 945 BUNKER HILL RD, SUITE 900, HOUSTON, TEXAS , 77024.
Item 2.	Identity and Background
(a)	The persons filing this statement are Teleios Capital Partners GmbH, a Swiss limited liability company ("Teleios"), Teleios Global Opportunities Master Fund, Ltd., a Cayman Islands exempted company (the "Master Fund"), Igor Kuzniar, a Swiss citizen ("Mr. Kuzniar" and collectively with Teleios and the Master Fund, the "Reporting Persons").
(b)	The principal business address of Teleios and Mr. Kuzniar is Baarerstrasse 12, 6300 Zug, Switzerland. The principal business address of the Master Fund is c/o BNP Paribas Bank & Trust Cayman Limited, 3rd Floor, Buckingham Square, 720 West Bay Road, PO Box 2003, George Town, Grand Cayman KY1-1104, Cayman Islands.
(c)	Teleios serves as the investment manager of certain private investment funds and managed accounts, including the Master Fund. The principal business of the Master Fund is purchasing, holding and selling securities for investment purposes. Mr. Kuzniar is the Managing Member of Teleios.
(d)	None of the Reporting Persons have, during the last five years, been convicted in a criminal proceeding (excluding traffic violations or similar misdemeanors).
(e)	None of the Reporting Persons have, during the last five years, been a party to a civil proceeding of a judicial or administrative body of competent jurisdiction and as a result of such proceeding was or is subject to a judgment, decree or final order enjoining future violations of, or prohibiting or mandating activities subject to, federal or state securities laws or finding any violation with respect to such laws.
Item 3.	Source and Amount of Funds or Other Consideration
	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. The net investment costs (including commissions, if any) of the Shares beneficially owned by the Master Fund 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 indirectly beneficially owned by Mr. Kuzniar 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 indirectly beneficially owned by Mr. Kuzniar 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.
Item 4.	Purpose of Transaction
	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 5.	Interest in Securities of the Issuer
(a)	The Reporting Persons acquired the Shares in connection with an acquisition by the Issuer of Tyman plc ("Tyman"), a company incorporated in England and Wales (the "Acquisition"). The Acquisition is further described in the Issuer's 8-K filed on August 1, 2024. As a result of the Acquisition, the Reporting Persons received voting securities of the Issuer in exchange for the Tyman shares it held. As a result of the "backside" acquisition, the Issuer filed a completed Notification and Report Form for Certain Mergers and Acquisitions with the U.S. antitrust authorities on May 10, 2024, per the requirements of the Hart-Scott-Rodino Antitrust Improvements Act of 1976. As of the date hereof, Teleios may be deemed to be the beneficial owner of 4,022,113 Shares, constituting 8.78% of the Shares, based upon 45,826,208 Shares outstanding as of the date hereof. Teleios has the sole power to vote or direct the vote of 0 Shares and the shared power to vote or direct the vote of 4,022,113 Shares. Teleios has the sole power to dispose or direct the disposition of 0 Shares and the shared power to dispose or direct the disposition of 4,022,113 Shares. As of the date hereof, the Master Fund may be deemed to be the beneficial owner of 4,022,113 Shares, constituting 8.78% of the Shares, based upon 45,826,208 Shares outstanding as of the date hereof. The Master Fund has the sole power to vote or direct the vote of 0 Shares and the shared power to vote or direct the vote of 4,022,113 Shares. The Master Fund has the sole power to dispose or direct the disposition of 0 Shares and the shared power to dispose or direct the disposition of 4,022,113 Shares. As of the date hereof, Mr. Kuzniar may be deemed to be the beneficial owner of 4,022,113 Shares, constituting 8.78% of the Shares, based upon 45,826,208 Shares outstanding as of the date hereof. Mr. Kuzniar has the sole power to vote or direct the vote of 0 Shares and the shared power to vote or direct the vote of 4,022,113 Shares. Mr. Kuzniar has the sole power to dispose or direct the disposition of 0 Shares and the shared power to dispose or direct the disposition of 4,022,113 Shares. The transactions in the Shares by the Reporting Persons during the past sixty days are set forth on Exhibit B. All of the reported transactions set forth on Exhibit B were open-market transactions.
Item 6.	Contracts, Arrangements, Understandings or Relationships With Respect to Securities of the Issuer
	Item 4 of the Schedule 13D is incorporated herein by reference.
Item 7.	Material to be Filed as Exhibits.
	Exhibit A: Joint Filing Agreement Exhibit B: Schedule of Transactions in the Shares

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

Teleios Capital Partners GmbH

Signature:	/s/ Igor Kuzniar
Name/Title:	Igor Kuzniar, Managing Officer
Date:	10/26/2026

Teleios Global Opportunities Master Fund, Ltd.

Signature:	/s/ Carl Speck
Name/Title:	Carl Speck, Director
Date:	10/26/2026

Igor Kuzniar

Signature:	/s/ Igor Kuzniar
Name/Title:	Igor Kuzniar
Date:	10/26/2026

Comments accompanying signature:

Each Reporting Person listed above disclaims beneficial ownership of the reported securities except to the extent of its pecuniary interests therein, and this report shall not be deemed an admission that such person is the beneficial owner of these securities for purposes of Section 16 of the U.S. Securities Exchange Act of 1934, as amended, or for any other purpose. Attention: Intentional misstatements or omissions of fact constitute Federal criminal violations (see 18 U.S.C. 1001).