MACOM (MTSI) director Geoffrey Ribar receives grant of 776 RSUs

Rhea-AI Filing Summary

RIBAR GEOFFREY G reported acquisition or exercise transactions in this Form 4 filing.

MACOM Technology Solutions director Geoffrey G. Ribar received an equity award of 776 restricted stock units (RSUs) of Common Stock. The award was granted under the company’s 2021 Omnibus Incentive Plan at no cash cost to him.

Each RSU represents the right to receive one share of Common Stock, vesting in full on March 6, 2027, if he remains in continuous service with the company through that date. Following this grant, he directly holds 14,186 shares of Common Stock.

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
Estimated average burden
hours per response:			0.5

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^*

RIBAR GEOFFREY G

(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)

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	14,186	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. Represents restricted stock units ("RSUs") granted to the Reporting Person under the Issuer's 2021 Omnibus Incentive Plan. Each RSU represents the contingent right to receive one share of Common Stock. The RSUs vest in full on March 6, 2027, provided that the Reporting Person remains in continuous service with the Issuer through the vesting date.

	/s/ Ambra R. Roth, Attorney-in-Fact	03/10/2026
	** 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 insider transaction did MACOM (MTSI) report for Geoffrey G. Ribar?

MACOM reported that director Geoffrey G. Ribar received a grant of 776 restricted stock units of Common Stock. The award was made under the 2021 Omnibus Incentive Plan and is a compensation-related equity grant, not an open-market stock purchase or sale.

How many MACOM (MTSI) shares does Geoffrey G. Ribar hold after this Form 4?

After the reported grant, Geoffrey G. Ribar directly holds 14,186 shares of MACOM Common Stock. This total includes the newly awarded 776 restricted stock units, which each represent the right to receive one share of Common Stock at future vesting.

What are the vesting terms of Geoffrey G. Ribar’s MACOM (MTSI) RSU grant?

The 776 restricted stock units granted to Geoffrey G. Ribar vest in full on March 6, 2027. Vesting requires that he remain in continuous service with MACOM Technology Solutions through that date for the shares to be delivered.

Was cash paid for Geoffrey G. Ribar’s MACOM (MTSI) RSU award?

No cash was paid for this award. The Form 4 shows 776 restricted stock units granted at a price per share of $0.0000, indicating a stock-based compensation grant under MACOM’s 2021 Omnibus Incentive Plan rather than a market purchase.

What plan governs Geoffrey G. Ribar’s new MACOM (MTSI) RSUs?

The 776 restricted stock units were granted under MACOM Technology Solutions’ 2021 Omnibus Incentive Plan. This plan allows the company to issue equity-based awards such as RSUs to directors and other service providers as part of their compensation.