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American Century entities and Stowers Institute reported beneficial ownership stakes in Haymaker Acquisition Corp. Class A common stock. The filing lists 2,707,667 shares (11.6%) for American Century Investment Management, American Century Companies and Stowers Institute, and 1,824,300 shares (7.8%) for American Century Capital Portfolios.
The filing uses a joint Schedule 13G format and is signed April 7, 2026.
Insights
Large institutional holdings disclosed; multiple related entities report double-digit stake.
The filing shows 2,707,667 shares representing 11.6% held by ACIM/ACC and Stowers Institute and 1,824,300 shares (7.8%) held by ACCP. These counts are presented as sole voting and dispositive power in the cover rows.
Ownership is reported jointly under Schedule 13G with signatures dated 04/07/2026. The filing notes ACIM serves as adviser to various accounts, and certain clients may hold interests; specific client-level holdings are not listed here.
Document follows passive-investor disclosure conventions for Schedule 13G; grouping and adviser relationships are disclosed.
The submission identifies adviser-client relationships and notes that no single ACIM-advised client exceeds 5% individually. The filing also lists the issuer's address and the CUSIP G4375F108, providing traceable identifiers for compliance review.
Because the disclosure is informational and non-transactional, further filings could be required if ownership or intent changes; timing or future actions are not provided in the excerpt.
Key Figures
ACIM/ACC shares:2,707,667 sharesACCP shares:1,824,300 sharesCUSIP:G4375F108+1 more
4 metrics
ACIM/ACC shares2,707,667 sharesreported sole dispositive power; <date>11.6%</date>
ACCP shares1,824,300 sharesreported sole voting and dispositive power; <date>7.8%</date>
Schedule 13G, Sole Dispositive Power, Beneficially owned
3 terms
Schedule 13Gregulatory
"Notice heading and signature rows showing joint filing on Schedule 13G"
A Schedule 13G is a formal document that investors file with the government when they acquire a large ownership stake in a company, usually for investment purposes rather than control. It helps keep the public informed about who owns significant parts of a company's shares, which can influence how the company is managed and how investors make decisions. Filing this schedule is important for transparency and understanding the ownership landscape of publicly traded companies.
Sole Dispositive Powerfinancial
"Cover rows listing 'Sole Dispositive Power 2,707,667.00'"
Sole dispositive power is the exclusive legal authority to decide what happens to a security — for example, whether to sell, transfer, or retain shares — without needing anyone else’s permission. Investors care because it signals who truly controls the economic outcome of an investment: like holding the only key to a safe, the holder can realize gains or losses and may trigger regulatory reporting, insider rules, or influence over corporate ownership.
Beneficially ownedregulatory
"Item 4 references 'Amount beneficially owned: See the response(s) to Item 9'"
Beneficially owned describes securities or assets where a person has the economic rights and control—such as the right to receive dividends and to direct voting—even if legal title is held in another name. Think of it like having the keys and using a car that’s registered to someone else: you get the benefits and make decisions. Investors care because beneficial ownership reveals who truly controls value and voting power, affecting corporate decisions and takeover dynamics.
FAQ
AI-generated questions and answers. How Rhea-AI works. Not financial advice.
What stake did American Century report in Haymaker Acquisition Corp. (HYAC)?
American Century Investment Management and related entities reported 2,707,667 shares (11.6%). The joint Schedule 13G shows ACIM/ACC and Stowers Institute each reporting 2,707,667 shares (11.6%) as sole dispositive holdings.
How many shares did American Century Capital Portfolios disclose in the HYAC filing?
American Century Capital Portfolios reported 1,824,300 shares (7.8%) of Class A common stock. The entry lists sole voting and sole dispositive power for that share count on the attached cover row.
When was the Schedule 13G for HYAC signed and who signed it?
The Schedule 13G was signed on 04/07/2026. Signatures include John Pak for American Century entities and Joselyn Verschelden for Stowers Institute as authorized signer.
What identifier and class were disclosed for Haymaker Acquisition Corp. in this filing?
The filing discloses Class A Common Stock with CUSIP G4375F108. The issuer's principal executive office is listed at 501 Madison Avenue, Floor 5, New York, NY 10022.
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
SCHEDULE 13G
UNDER THE SECURITIES EXCHANGE ACT OF 1934
Haymaker Acquisition Corp. 4
(Name of Issuer)
Class A Common Stock
(Title of Class of Securities)
G4375F108
(CUSIP Number)
03/31/2026
(Date of Event Which Requires Filing of this Statement)
Check the appropriate box to designate the rule pursuant to which this Schedule is filed:
Rule 13d-1(b)
Rule 13d-1(c)
Rule 13d-1(d)
schemaVersion:
SCHEDULE 13G
CUSIP Number(s):
G4375F108
1
Names of Reporting Persons
American Century Capital Portfolios, Inc.
2
Check the appropriate box if a member of a Group (see instructions)
(a)
(b)
3
Sec Use Only
4
Citizenship or Place of Organization
MARYLAND
Number of Shares Beneficially Owned by Each Reporting Person With:
5
Sole Voting Power
1,824,300.00
6
Shared Voting Power
0.00
7
Sole Dispositive Power
1,824,300.00
8
Shared Dispositive Power
0.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
1,824,300.00
10
Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)
11
Percent of class represented by amount in row (9)
7.8 %
12
Type of Reporting Person (See Instructions)
IV
SCHEDULE 13G
CUSIP Number(s):
G4375F108
1
Names of Reporting Persons
American Century Investment Management, Inc.
2
Check the appropriate box if a member of a Group (see instructions)
(a)
(b)
3
Sec Use Only
4
Citizenship or Place of Organization
DELAWARE
Number of Shares Beneficially Owned by Each Reporting Person With:
5
Sole Voting Power
2,602,961.00
6
Shared Voting Power
0.00
7
Sole Dispositive Power
2,707,667.00
8
Shared Dispositive Power
0.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
2,707,667.00
10
Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)
11
Percent of class represented by amount in row (9)
11.6 %
12
Type of Reporting Person (See Instructions)
IA
SCHEDULE 13G
CUSIP Number(s):
G4375F108
1
Names of Reporting Persons
American Century Companies, Inc.
2
Check the appropriate box if a member of a Group (see instructions)
(a)
(b)
3
Sec Use Only
4
Citizenship or Place of Organization
DELAWARE
Number of Shares Beneficially Owned by Each Reporting Person With:
5
Sole Voting Power
2,602,961.00
6
Shared Voting Power
0.00
7
Sole Dispositive Power
2,707,667.00
8
Shared Dispositive Power
0.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
2,707,667.00
10
Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)
11
Percent of class represented by amount in row (9)
11.6 %
12
Type of Reporting Person (See Instructions)
HC
SCHEDULE 13G
CUSIP Number(s):
G4375F108
1
Names of Reporting Persons
Stowers Institute for Medical Research
2
Check the appropriate box if a member of a Group (see instructions)
(a)
(b)
3
Sec Use Only
4
Citizenship or Place of Organization
DELAWARE
Number of Shares Beneficially Owned by Each Reporting Person With:
5
Sole Voting Power
2,602,961.00
6
Shared Voting Power
0.00
7
Sole Dispositive Power
2,707,667.00
8
Shared Dispositive Power
0.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
2,707,667.00
10
Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)
11
Percent of class represented by amount in row (9)
11.6 %
12
Type of Reporting Person (See Instructions)
HC
SCHEDULE 13G
Item 1.
(a)
Name of issuer:
Haymaker Acquisition Corp. 4
(b)
Address of issuer's principal executive offices:
501 Madison Avenue, Floor 5, New York, New York, 10022
Item 2.
(a)
Name of person filing:
American Century Capital Portfolios, Inc.
American Century Investment Management, Inc.
American Century Companies, Inc.
Stowers Institute for Medical Research
(b)
Address or principal business office or, if none, residence:
4500 Main Street
9th Floor
Kansas City, Missouri 64111
(c)
Citizenship:
Maryland
Delaware
(d)
Title of class of securities:
Class A Common Stock
(e)
CUSIP Number(s):
G4375F108
Item 3.
If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:
(a)
Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);
(b)
Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);
(c)
Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);
(d)
Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);
(e)
An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);
(f)
An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);
(g)
A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);
(h)
A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
(i)
A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
(j)
A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J),
please specify the type of institution:
(k)
Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).
Item 4.
Ownership
(a)
Amount beneficially owned:
See the response(s) to Item 9 on the attached cover page(s).
(b)
Percent of class:
See the response(s) to Item 11 on the attached cover page(s).
(c)
Number of shares as to which the person has:
(i) Sole power to vote or to direct the vote:
See the response(s) to Item 5 on the attached cover page(s).
(ii) Shared power to vote or to direct the vote:
See the response(s) to Item 6 on the attached cover page(s).
(iii) Sole power to dispose or to direct the disposition of:
See the response(s) to Item 7 on the attached cover page(s).
(iv) Shared power to dispose or to direct the disposition of:
See the response(s) to Item 8 on the attached cover page(s).
Item 5.
Ownership of 5 Percent or Less of a Class.
Not Applicable
Item 6.
Ownership of more than 5 Percent on Behalf of Another Person.
If any other person is known to have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, such securities, a statement to that effect should be included in response to this item and, if such interest relates to more than 5 percent of the class, such person should be identified. A listing of the shareholders of an investment company registered under the Investment Company Act of 1940 or the beneficiaries of employee benefit plan, pension fund or endowment fund is not required.
Various persons, including the investment companies and separate institutional investor accounts that American Century Investment Management, Inc. ("ACIM") serves as investment adviser, have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, the securities that are the subject of this schedule. Except as may be otherwise indicated if this is a joint filing, not more than 5% of the class of securities that is the subject of this schedule is owned by any one client advised by ACIM.
Item 7.
Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
If a parent holding company has filed this schedule, pursuant to Rule 13d-1(b)(ii)(G), so indicate under Item 3(g) and attach an exhibit stating the identity and the Item 3 classification of the relevant subsidiary. If a parent holding company has filed this schedule pursuant to Rule 13d-1(c) or Rule 13d-1(d), attach an exhibit stating the identification of the relevant subsidiary.
This Item identifies each subsidiary of American Century Companies, Inc. ("ACC"), which is controlled by the Stowers Institute for Medical Research, that is a beneficial owner of securities that are subject of this schedule (the "Subject Securities"). American Century Investment Management, Inc. ("ACIM") is a wholly-owned subsidiary of ACC and an investment adviser registered under Section 203 of the Investment Advisers Act of 1940.
Item 8.
Identification and Classification of Members of the Group.
If a group has filed this schedule pursuant to §240.13d-1(b)(1)(ii)(K), so indicate under Item 3(k) and attach an exhibit stating the identity and Item 3 classification of each member of the group. If a group has filed this schedule pursuant to §240.13d-1(c) or §240.13d-1(d), attach an exhibit stating the identity of each member of the group.
Not applicable
Item 9.
Notice of Dissolution of Group.
Notice of dissolution of a group may be furnished as an exhibit stating the date of the dissolution and that all further filings with respect to transactions in the security reported on will be filed, if required, by members of the group, in their individual capacity. See Item 5.
Not applicable
Item 10.
Certifications:
By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under ?? 240.14a-11.
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.
American Century Capital Portfolios, Inc.
Signature:
American Century Capital Portfolios, Inc.
Name/Title:
/s/ John Pak / Senior Vice President
Date:
04/07/2026
American Century Investment Management, Inc.
Signature:
American Century Investment Management, Inc.
Name/Title:
/s/ John Pak / Senior Vice President
Date:
04/07/2026
American Century Companies, Inc.
Signature:
American Century Companies, Inc.
Name/Title:
/s/ John Pak / Senior Vice President
Date:
04/07/2026
Stowers Institute for Medical Research
Signature:
Stowers Institute for Medical Research
Name/Title:
/s/ Joselyn Verschelden / Authorized Signer
Date:
04/07/2026
Exhibit Information
EXHIBIT
Each of the undersigned hereby agrees and consents to the execution and joint filing on its behalf by American Century Investment Management, Inc. of this Schedule 13G respecting the beneficial ownership of the securities which are the subject of this schedule.
Dated this 7th day of April, 2026.
AMERICAN CENTURY CAPITAL PORTFOLIOS, INC. ("ACCP")
AMERICAN CENTURY INVESTMENT MANAGEMENT, INC. ("ACIM")
AMERICAN CENTURY COMPANIES, INC. ("ACC")
By: __/s/ John Pak_______________________
John Pak
Senior Vice President, ACCP, ACIM and ACC
STOWERS INSTITUTE FOR MEDICAL RESEARCH, solely in its capacity as control entity of ACC
By: __/s/ Joselyn Verschelden_______________
Joselyn Verschelden
Authorized Signer
