[Form 4] MACOM Technology Solutions Holdings, Inc. Insider Trading Activity

Rhea-AI Filing Summary

Insider sale executed under a 10b5-1 plan. Senior Vice President Robert Dennehy of MACOM Technology Solutions Holdings (ticker MTSI) reported sales on 10/02/2025 that disposed of 4,081 and 919 shares of common stock at weighted-average prices of $127.15 and $127.61, respectively. The filing states the sales were made pursuant to a sales plan adopted on 02/28/2025 intended to comply with Rule 10b5-1. Following the reported transactions the beneficial ownership amounts are listed as 11,599 and 10,680 shares (direct holdings as reported). The report is signed by an attorney-in-fact on 10/06/2025.

Positive

• Transactions executed under a Rule 10b5-1 plan, indicating pre-arranged compliance with insider trading rules
• Weighted-average prices disclosed ($127.15 and $127.61), giving transparency on sale pricing

Negative

• Insider sold a total of 5,000 shares on 10/02/2025, reducing reported direct holdings
• Filing does not disclose the plan's full terms or remaining schedule, limiting assessment of future insider activity

Insights

Corporate Governance Analyst

Sale under an established 10b5-1 plan reduces direct holdings but follows a pre-arranged program.

The filings show two disposals totaling 5,000 shares executed on 10/02/2025 at weighted-average prices of $127.15 and $127.61. The reporting person identifies the transactions as made under a plan adopted on 02/28/2025, which typically provides an affirmative defense under Rule 10b5-1 when properly documented.

Key dependencies include the plan's terms and any blackout or trading-window constraints; these are not disclosed here. Investors may note the reduction in direct holdings to 11,599 and 10,680 shares as listed; the near-term materiality is limited unless combined with additional undisclosed transactions.

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
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Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

X

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Dennehy Robert

(Last) (First) (Middle)

C/O MACOM TECHNOLOGY SOLUTIONS HOLDINGS

100 CHELMSFORD STREET

(Street)

LOWELL MA 01851

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
MACOM Technology Solutions Holdings, Inc. [ MTSI ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	SVP, Operations

3. Date of Earliest Transaction (Month/Day/Year)
10/02/2025

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	10/02/2025		S(1)		4,081	D	$127.15(2)	11,599	D
Common Stock	10/02/2025		S(1)		919	D	$127.61(3)	10,680	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. The shares were sold pursuant to a sales plan adopted by the Reporting Person on February 28, 2025 and intended to comply with Rule 10b5-1 under The Securities Exchange Act of 1934.

2. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $126.50 to $127.49. The Reporting Person undertakes to provide to the Issuer, any shareholder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

3. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $127.53 to $127.63. The Reporting Person undertakes to provide to the Issuer, any shareholder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

	/s/ Ambra R. Roth, Attorney-in-Fact	10/06/2025
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

FAQ

What did MTSI insider Robert Dennehy report on Form 4?

He reported sales on 10/02/2025 disposing of 4,081 and 919 shares under a 10b5-1 plan at weighted-average prices of $127.15 and $127.61.

Were the sales made under a Rule 10b5-1 trading plan for MTSI?

Yes. The filing states the shares were sold pursuant to a sales plan adopted on 02/28/2025 intended to comply with Rule 10b5-1.

How many shares does the filing show as beneficially owned after the transactions?

The filing lists beneficial ownership amounts of 11,599 and 10,680 shares (direct holdings) following the reported transactions.

What prices were the shares sold at in the Form 4?

The report gives weighted-average sale prices of $127.15 (range $126.50–$127.49) and $127.61 (range $127.53–$127.63), with detailed per-price breakdowns available upon request as stated.

Who signed the Form 4 for the reporting person?

The filing is signed by Ambra R. Roth, Attorney-in-Fact on 10/06/2025.