Director for MACOM (NASDAQ: MTSI) receives 776 RSUs for Summit Partners

Rhea-AI Filing Summary

CHUNG PETER Y reported acquisition or exercise transactions in this Form 4 filing.

MACOM Technology Solutions director Peter Y. Chung reported an award of 776 restricted stock units of Common Stock. The units were granted as part of the director compensation program at no cash cost and will vest on March 6, 2027, if he remains in continuous service.

After this grant, 50,049 shares and restricted stock units are held in Mr. Chung’s name for the benefit of Summit Partners, L.P. Voting and investment decisions over these securities are made by Summit Partners, L.P. through a two-person investment committee, and beneficial ownership is disclaimed except for any pecuniary interest.

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

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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).

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^*

CHUNG PETER Y

(Last) (First) (Middle)

C/O SUMMIT PARTNERS

222 BERKELEY STREET, 18TH FLOOR

(Street)

BOSTON MA 02116

(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)

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

3. Date of Earliest Transaction (Month/Day/Year)
03/06/2026

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	03/06/2026		A		776(1)	A	$0	50,049(2)	I	See Remarks(3)

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. Represents restricted stock units granted to Mr. Chung as part of the director compensation program. The restricted stock units will vest on March 6, 2027, and will settle solely by delivery of an equal number of shares of Common Stock provided that Mr. Chung remains in continuous service with the Issuer through the vesting date.

2. The 50,049 shares and restricted stock units are held in the name of Mr. Chung, which are held for the benefit of Summit Partners, L.P.

3. Mr. Chung holds any Common Stock and restricted stock units for the benefit of Summit Partners, L.P. which he has empowered to determine when the underlying shares will be sold and which is entitled to the proceeds of any such sales. Summit Partners, L.P., through a two-person Investment Committee, responsible for voting and investment decisions with respect to the Issuer, currently composed of Scott C. Collins and Peter Y. Chung, has voting and dispositive authority over the shares and restricted stock units reported herein and therefore may be deemed to beneficially own such shares. Summit Partners, L.P., Mr. Collins and Mr. Chung disclaims beneficial ownership of the shares of common stock and the restricted stock units, except to the extent of their pecuniary interest therein.

	Adam H. Hennessey, POA for Peter Y. Chung	03/09/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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FAQ

What insider transaction did MACOM (MTSI) report for Peter Y. Chung?

The filing reports that director Peter Y. Chung acquired 776 restricted stock units of MACOM Common Stock. The award was made as part of the director compensation program and carried a $0.00 grant price, meaning no cash was paid for the units.

When do Peter Y. Chung’s new MACOM (MTSI) restricted stock units vest?

The 776 restricted stock units granted to Peter Y. Chung are scheduled to vest on March 6, 2027. Vesting is conditioned on Mr. Chung remaining in continuous service with MACOM Technology Solutions Holdings, Inc. through that vesting date.

How will Peter Y. Chung’s MACOM (MTSI) restricted stock units be settled?

Upon vesting, the restricted stock units will settle solely in shares of Common Stock of MACOM. Each restricted stock unit converts into one share of Common Stock, delivered after vesting if Mr. Chung meets the service condition.

Who ultimately benefits from the MACOM (MTSI) shares and RSUs held by Peter Y. Chung?

The 50,049 shares and restricted stock units held in Peter Y. Chung’s name are for the benefit of Summit Partners, L.P.. Summit Partners, L.P. is entitled to sale proceeds and may be deemed to beneficially own the securities, subject to pecuniary interest.

Who has voting and investment authority over the MACOM (MTSI) securities linked to Peter Y. Chung?

Summit Partners, L.P., through a two-person investment committee including Scott C. Collins and Peter Y. Chung, holds voting and dispositive authority. They may be deemed to beneficially own these shares and restricted stock units, while also disclaiming ownership beyond pecuniary interest.

Is Peter Y. Chung’s MACOM (MTSI) transaction a purchase or an award?

The transaction is an award of restricted stock units, not an open-market purchase. It is coded as a grant or other acquisition, issued as part of the company’s director compensation program with no cash paid per share.