MarineMax, Inc. filing: Amend. No. 8 to a Schedule 13G/A reports institutional holdings by American Century entities and Stowers Institute. The filing lists 1,095,000 shares (5.0%) held by American Century Capital Portfolios, Inc.; and 2,120,402 shares (9.6%) reported for American Century Investment Management, Inc., American Century Companies, Inc., and Stowers Institute. Signatures show the schedule was executed on 05/01/2026.
Positive
None.
Negative
None.
Insights
Large passive positions by American Century affiliates and the Stowers Institute are documented.
The schedule lists 2,120,402 shares (reported 9.6%) for ACIM/ACC/Stowers and 1,095,000 shares (5.0%) for ACCP as of the reporting period.
These entries record beneficial ownership and voting/dispositive powers; timing and any trading activity are not disclosed in the excerpt. Subsequent filings will show transactions if required.
Key Figures
Reporting period:03/31/2026ACCP shares:1,095,000 sharesACIM/ACC/Stowers shares:2,120,402 shares+2 more
5 metrics
Reporting period03/31/2026Cover page reporting date
ACCP shares1,095,000 sharesAmerican Century Capital Portfolios, Inc.
ACIM/ACC/Stowers shares2,120,402 sharesAmerican Century Investment Management, American Century Companies, Stowers Institute
ACCP percent of class5.0%Percent of class for ACCP
ACIM/ACC/Stowers percent of class9.6%Percent of class for ACIM/ACC/Stowers
Key Terms
Schedule 13G/A, Beneficially owned, Sole Dispositive Power
3 terms
Schedule 13G/Aregulatory
"Amendment No. 8 MarineMax, Inc. Common Stock 567908108"
A Schedule 13G/A is an amended public filing with the U.S. securities regulator that updates a previous Schedule 13G, disclosing when an individual or group holds a substantial (typically over 5%) stake in a company and is claiming a passive, non‑controlling intent. Investors monitor these updates because rising or falling holdings can signal changing confidence, potential future moves, or shifts in voting power — like watching a public ledger where large shareholders quietly adjust their positions.
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.
Sole Dispositive Powerregulatory
"7 | Sole Dispositive Power 1,095,000.00"
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.
What stake does American Century Investment Management report in MarineMax (HZO)?
It reports beneficial ownership of 2,120,402 shares, representing 9.6%. The filing shows sole voting power of 2,053,376 shares and sole dispositive power of 2,120,402 shares as disclosed on the cover entries.
How many shares does American Century Capital Portfolios hold in MarineMax (HZO)?
American Century Capital Portfolios reports beneficial ownership of 1,095,000 shares, representing 5.0% of the class. The cover data shows sole voting and sole dispositive power for that share amount.
Does the filing show control by the Stowers Institute over MarineMax shares?
Stowers Institute is listed as reporting 2,120,402 shares ( 9.6%) and is described as the control entity of ACC. The schedule records its beneficial ownership and associated dispositive power.
What date and signatures appear on this Schedule 13G/A amendment for HZO?
The schedule is signed by representatives of the reporting entities and dated 05/01/2026. The cover page shows the reporting period date 03/31/2026 alongside the CUSIP information.
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
SCHEDULE 13G
UNDER THE SECURITIES EXCHANGE ACT OF 1934
(Amendment No. 8)
MarineMax, Inc.
(Name of Issuer)
Common Stock
(Title of Class of Securities)
567908108
(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):
567908108
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
1,095,000.00
6
Shared Voting Power
0.00
7
Sole Dispositive Power
1,095,000.00
8
Shared Dispositive Power
0.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
1,095,000.00
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)
5.0 %
12
Type of Reporting Person (See Instructions)
IV
SCHEDULE 13G
CUSIP Number(s):
567908108
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
2,053,376.00
6
Shared Voting Power
0.00
7
Sole Dispositive Power
2,120,402.00
8
Shared Dispositive Power
0.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
2,120,402.00
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)
9.6 %
12
Type of Reporting Person (See Instructions)
IA
SCHEDULE 13G
CUSIP Number(s):
567908108
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
2,053,376.00
6
Shared Voting Power
0.00
7
Sole Dispositive Power
2,120,402.00
8
Shared Dispositive Power
0.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
2,120,402.00
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)
9.6 %
12
Type of Reporting Person (See Instructions)
HC
SCHEDULE 13G
CUSIP Number(s):
567908108
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
2,053,376.00
6
Shared Voting Power
0.00
7
Sole Dispositive Power
2,120,402.00
8
Shared Dispositive Power
0.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
2,120,402.00
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)
9.6 %
12
Type of Reporting Person (See Instructions)
HC
SCHEDULE 13G
Item 1.
(a)
Name of issuer:
MarineMax, Inc.
(b)
Address of issuer's principal executive offices:
2600 McCormick Drive, Suite 200, Clearwater, Florida, 33759
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:
Common Stock
(e)
CUSIP No.:
567908108
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)(J), so indicate under Item 3(j) 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:
05/01/2026
American Century Investment Management, Inc.
Signature:
American Century Investment Management, Inc.
Name/Title:
/s/ John Pak / Senior Vice President
Date:
05/01/2026
American Century Companies, Inc.
Signature:
American Century Companies, Inc.
Name/Title:
/s/ John Pak / Senior Vice President
Date:
05/01/2026
Stowers Institute for Medical Research
Signature:
Stowers Institute for Medical Research
Name/Title:
/s/ Joselyn Verschelden / Authorized Signer
Date:
05/01/2026
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 1st day of May, 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
