Ownership Submission
FORM 3
 UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940
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(Print or Type Responses)
1. Name and Address of Reporting Person *
  Hegarty Conor Noel
 2. Date of Event Requiring Statement (Month/Day/Year)
04/10/2019		 3. Issuer Name and Ticker or Trading Symbol
MACOM Technology Solutions Holdings, Inc. [MTSI]
(Last)
(First)
(Middle)
C/O MACOM TECHNOLOGY SOLUTIONS HOLDINGS, 100 CHELMSFORD STREET		 4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director _____ 10% Owner
__X__ Officer (give title below) _____ Other (specify below)
PFO and PAO
 5. If Amendment, Date Original Filed(Month/Day/Year)
(Street)

LOWELL, MA 01851		 6. Individual or Joint/Group Filing(Check Applicable Line)
_X_ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person
(City)
(State)
(Zip)
Table I - Non-Derivative Securities Beneficially Owned
1.Title of Security
(Instr. 4)		 2. Amount of Securities Beneficially Owned
(Instr. 4)		 3. Ownership Form: Direct (D) or Indirect (I)
(Instr. 5)		 4. Nature of Indirect Beneficial Ownership
(Instr. 5)
Common Stock 13,658 (1)
D
 

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly. SEC 1473 (7-02)
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Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 4)		 2. Date Exercisable and Expiration Date
(Month/Day/Year)		 3. Title and Amount of Securities Underlying Derivative Security
(Instr. 4)		 4. Conversion or Exercise Price of Derivative Security 5. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 5)		 6. Nature of Indirect Beneficial Ownership
(Instr. 5)
Date Exercisable Expiration Date Title Amount or Number of Shares

Reporting Owners

Reporting Owner Name / Address Relationships
Director 10% Owner Officer Other
Hegarty Conor Noel
C/O MACOM TECHNOLOGY SOLUTIONS HOLDINGS
100 CHELMSFORD STREET
LOWELL, MA 01851		       PFO and PAO  

Signatures

/s/ Ambra R. Roth, Attorney-in-Fact 04/12/2019
**Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 5(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).
(1) Includes (i) 6,264 restricted stock units ("RSUs") granted on March 15, 2019, which vest as follows: 1,566 RSUs vest on February 15, 2020, 1,566 RSUs vest on February 15, 2021, 1,566 RSUs vest on February 15, 2022 and 1,566 RSUs vest on February 15, 2023; (ii) 1,998 RSUs granted on March 15, 2018, which vest as follows: 665 RSUs vest on February 15, 2020, 665 RSUs vest on February 15, 2021, and 668 RSUs vest on February 15, 2022; (iii) 1,197 RSUs granted on March 14, 2017, which vest as follows: 598 RSUs vest on February 15, 2020 and 599 RSUs vest on February 15, 2021; and (iv) 624 RSUs granted on March 17, 2016, which vest on February 15, 2020, provided with respect to each vesting event described herein that the Reporting Person remains in continuous service with the Issuer through such vesting date. All RSUs were granted to the Reporting Person under the Issuer's 2012 Omnibus Incentive Plan and each RSU represents the contingent right to receive one share of Common Stock.
 
Remarks:
Exhibit List:  Exhibit 24 - Power of Attorney

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