T. Rowe Price (MTSI) files 13G/A showing 4.49M shares, 6.0% stake

Rhea-AI Filing Summary

MACOM Technology Solutions Holdings Inc: T. Rowe Price Investment Management, Inc. filed an amendment to its Schedule 13G reporting beneficial ownership of 4,486,082 shares of Common Stock, representing 6.0% of the class. The filing lists 4,472,294 shares as sole voting power and 4,486,082 as sole dispositive power. The submission is signed by Ellen York on 05/15/2026. The filer also expressly states that this filing should not be construed as an admission of beneficial ownership.

Insights

Institutional Ownership Analyst

T. Rowe Price reports a 6.0% stake in MTSI with full voting and dispositive control shown.

T. Rowe Price's amendment lists 4,486,082 shares and indicates sole voting power over 4,472,294 shares. This identifies the firm as a significant reported holder under ownership disclosure rules.

While the filing quantifies position and voting/dispositive powers, it also includes an explicit denial of beneficial ownership; further filings or fund disclosures may clarify economic exposure.

Securities Compliance Counsel

The amendment is a routine SEC ownership disclosure with a formal reservation of non-beneficial-status language.

The Schedule 13G/A format and the signature dated 05/15/2026 align with reporting obligations for large passive or qualifying holders. The filing documents exact voting and dispositive counts as required.

Because the filer includes a statement denying beneficial ownership, users should reference the filer’s internal disclosures or subsequent amendments for definitive attribution.

Key Figures

Beneficial ownership: 4,486,082 shares Percent of class: 6.0% Sole voting power: 4,472,294 shares +2 more

5 metrics

Beneficial ownership 4,486,082 shares Amount beneficially owned reported on the amendment

Percent of class 6.0% Percent of common stock represented by the reported shares

Sole voting power 4,472,294 shares Shares with sole power to vote listed in Item 4(c)(i)

Sole dispositive power 4,486,082 shares Shares with sole power to dispose listed in Item 4(c)(iii)

CUSIP 55405Y100 Security identifier for MACOM common stock

Key Terms

Schedule 13G/A, Sole dispositive power, Beneficially owned

3 terms

Schedule 13G/A regulatory

"Amendment No. 1 to Schedule 13G reporting ownership"

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.

Sole dispositive power regulatory

"Sole power to dispose or to direct the disposition of: 4,486,082"

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 owned regulatory

"Amount beneficially owned: 4486082"

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.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 1)

MACOM TECHNOLOGY SOLUTIONS HOLDINGS INC

(Name of Issuer)

COMMON STOCK

(Title of Class of Securities)

55405Y100

(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): 55405Y100

1

Names of Reporting Persons

T. Rowe Price 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

MARYLAND

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 4,472,294.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 4,486,082.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

4,486,082.00

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)

6.0 %

12

Type of Reporting Person (See Instructions)

IA

SCHEDULE 13G

Item 1.
(a)	Name of issuer: MACOM TECHNOLOGY SOLUTIONS HOLDINGS INC
(b)	Address of issuer's principal executive offices: 100 CHELMSFORD STREET, LOWELL, MA, 01851
Item 2.
(a)	Name of person filing: T. Rowe Price Investment Management, Inc.
(b)	Address or principal business office or, if none, residence: 1307 Point Street, Baltimore, MD 21231
(c)	Citizenship: Maryland
(d)	Title of class of securities: COMMON STOCK
(e)	CUSIP No.: 55405Y100
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: 4486082
(b)	Percent of class: 6.0 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 4472294
	(ii) Shared power to vote or to direct the vote: 0
	(iii) Sole power to dispose or to direct the disposition of: 4486082
	(iv) Shared power to dispose or to direct the disposition of: 0
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.
	Not Applicable
Item 7.	Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
	Not Applicable
Item 8.	Identification and Classification of Members of the Group.
	Not Applicable
Item 9.	Notice of Dissolution of Group.
	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. T. Rowe Price Investment Management, Inc. hereby declares and affirms that the filing of Schedule 13G shall not be construed as an admission that Price Investment Management is the beneficial owner of the securities referred to, which beneficial ownership is expressly denied.

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.

T. Rowe Price Investment Management, Inc.

Signature:	Ellen York
Name/Title:	Vice President
Date:	05/15/2026

FAQ

What stake does T. Rowe Price report in MTSI?

T. Rowe Price reports beneficial ownership of 4,486,082 shares, equal to 6.0% of MACOM Technology Solutions Holdings Inc. The filing lists specific voting and dispositive powers tied to that share count.

How many votes does T. Rowe Price control in MTSI?

The amendment shows T. Rowe Price has sole voting power over 4,472,294 shares. The filing separately lists sole dispositive power over 4,486,082 shares, indicating control over voting and disposition in the reported amounts.

When was the Schedule 13G/A signed for this filing?

The Schedule 13G/A amendment is signed by Ellen York, Vice President, on 05/15/2026. That signature date appears on the submitted amendment and validates the filing transmission.

Does the filing confirm T. Rowe Price is the beneficial owner?

The filing expressly states that it "shall not be construed as an admission" that T. Rowe Price is the beneficial owner and denies such beneficial ownership in the text. The statement accompanies the reported share counts.