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

MACOM (NASDAQ: MTSI) SVP sells 2,595 shares, retains 32,376

Filing Impact
(Very High)
Filing Sentiment
(Negative)
Form Type
4

Rhea-AI Filing Summary

MACOM Technology Solutions Holdings, Inc. senior vice president of global sales Donghyun Thomas Hwang reported a series of open-market sales of common stock. On May 18, 2026, he sold a total of 2,595 shares at weighted average prices in the mid-$350s to high-$370s per share under a pre-arranged Rule 10b5-1 trading plan adopted on August 11, 2025. Following these transactions, he directly owns 32,376 shares of MACOM common stock. On May 15, 2026, he also acquired 85 shares at $138.13 per share through the company’s Employee Stock Purchase Plan.

Positive

  • None.

Negative

  • None.
Insider Hwang Donghyun Thomas
Role SVP, Global Sales
Sold 2,595 shs ($936K)
Type Security Shares Price Value
Sale Common Stock 300 $353.32 $106K
Sale Common Stock 300 $355.06 $107K
Sale Common Stock 500 $356.68 $178K
Sale Common Stock 300 $358.84 $108K
Sale Common Stock 500 $360.38 $180K
Sale Common Stock 100 $362.89 $36K
Sale Common Stock 100 $364.93 $36K
Sale Common Stock 200 $367.50 $74K
Sale Common Stock 100 $369.06 $37K
Sale Common Stock 100 $377.70 $38K
Sale Common Stock 95 $381.23 $36K
Grant/Award Common Stock 85 $138.13 $12K
Holdings After Transaction: Common Stock — 34,671 shares (Direct, null)
Footnotes (1)
  1. The shares were purchased under the Issuer's Employee Stock Purchase Plan. The shares were sold pursuant to a sales plan adopted by the Reporting Person on August 11, 2025 and intended to comply with Rule 10b5-1 under the Securities Exchange Act of 1934. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $352.78 to $353.68. 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. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $354.73 to $355.71. 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. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $356.39 to $357.34. 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. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $358.51 to $359.05. 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. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $359.95 to $360.85. 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. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $367.22 to $367.78. 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.
Shares sold 2,595 shares Total open-market sales on May 18, 2026
Shares acquired via ESPP 85 shares at $138.13/share Employee Stock Purchase Plan acquisition on May 15, 2026
Holdings after transactions 32,376 shares Direct MACOM common stock ownership after Form 4 trades
Sample sale prices $381.23, $377.70, $360.38/share Individual reported transaction prices on May 18, 2026
Price ranges from footnotes $352.78–$360.85/share; $367.22–$367.78/share Weighted-average sale price ranges disclosed in footnotes
Rule 10b5-1 regulatory
"intended to comply with Rule 10b5-1 under the Securities Exchange Act of 1934"
Rule 10b5-1 is a regulation that allows company insiders to buy or sell their shares at predetermined times, even if they have access to non-public information. It acts like setting a schedule in advance for transactions, helping prevent accusations of unfair trading. This rule provides a way for insiders to plan trades transparently, giving investors confidence that these transactions are not based on hidden information.
Employee Stock Purchase Plan financial
"The shares were purchased under the Issuer's Employee Stock Purchase Plan"
An employee stock purchase plan is a company program that lets workers buy shares through small payroll deductions, often at a discount to the market price and after a set offering period. Think of it like a workplace savings plan that turns into ownership: it encourages employees to share in the company’s success and can create predictable buying or selling of stock that investors watch because it affects supply, demand and employee incentives.
weighted average price financial
"The price reported in Column 4 is a weighted average price"
Weighted average price is the average price of a security where each trade or component is counted according to its size, so bigger trades pull the average more than smaller ones. Think of it like calculating the average cost of a grocery haul where items you bought more of have greater influence on the final per-item cost. Investors use it to understand the true average price paid or received, judge execution quality, and compare trading performance against market movement.
open-market sale financial
"transaction_action": "open-market sale""
An open-market sale is when a shareholder sells existing shares directly on a public exchange to any willing buyer, rather than through a private deal. Think of it like putting goods on a busy market stall where price is set by supply and demand; for investors it matters because such sales increase available supply, can put short-term downward pressure on the stock price, and signal changes in liquidity or investor confidence.
Form 4 Insider Transactions: What Each Field Means →
SEC Form 4
FORM 4UNITED 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).
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*
Hwang Donghyun Thomas
(Last)(First)(Middle)
C/O MACOM TECHNOLOGY SOLUTIONS HOLDINGS
100 CHELMSFORD STREET
(Street)
LOWELL MASSACHUSETTS 01851
(City)(State)(Zip)
UNITED STATES
(Country)		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)
Director10% Owner
XOfficer (give title below)Other (specify below)
SVP, Global Sales
2a. Foreign Trading Symbol
3. Date of Earliest Transaction (Month/Day/Year)
05/18/2026		6. Individual or Joint/Group Filing (Check Applicable Line)
XForm filed by One Reporting Person
Form filed by More than One Reporting Person
4. If Amendment, Date of Original Filed (Month/Day/Year)

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)
CodeVAmount(A) or (D)Price
Common Stock05/15/2026A(1)V85A$138.1334,971D
Common Stock05/18/2026S(2)300D$353.32(3)34,671D
Common Stock05/18/2026S(2)300D$355.06(4)34,371D
Common Stock05/18/2026S(2)500D$356.68(5)33,871D
Common Stock05/18/2026S(2)300D$358.84(6)33,571D
Common Stock05/18/2026S(2)500D$360.38(7)33,071D
Common Stock05/18/2026S(2)100D$362.8932,971D
Common Stock05/18/2026S(2)100D$364.9332,871D
Common Stock05/18/2026S(2)200D$367.5(8)32,671D
Common Stock05/18/2026S(2)100D$369.0632,571D
Common Stock05/18/2026S(2)100D$377.732,471D
Common Stock05/18/2026S(2)95D$381.2332,376D
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)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount or Number of Shares
Explanation of Responses:
1. The shares were purchased under the Issuer's Employee Stock Purchase Plan.
2. The shares were sold pursuant to a sales plan adopted by the Reporting Person on August 11, 2025 and intended to comply with Rule 10b5-1 under the Securities Exchange Act of 1934.
3. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $352.78 to $353.68. 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.
4. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $354.73 to $355.71. 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.
5. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $356.39 to $357.34. 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.
6. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $358.51 to $359.05. 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.
7. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $359.95 to $360.85. 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.
8. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $367.22 to $367.78. 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-Fact05/20/2026
** Signature of Reporting PersonDate
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.
* Form 4: SEC 1474 (03-26)

Source: View Original Filing on SEC EDGAR

FAQ

What did MACOM (MTSI) executive Donghyun Thomas Hwang report in this Form 4?

He reported multiple open-market sales totaling 2,595 shares of MACOM common stock on May 18, 2026, plus an acquisition of 85 shares on May 15, 2026. These transactions adjust his direct equity stake in the company.

How many MACOM (MTSI) shares does Donghyun Thomas Hwang hold after the reported trades?

After the reported transactions, he directly holds 32,376 shares of MACOM common stock. This figure comes from the post-transaction holdings shown in the Form 4 and reflects his remaining direct ownership position.

At what prices did the MACOM (MTSI) shares sell in Hwang’s May 18, 2026 trades?

The Form 4 lists weighted average sale prices, including specific executions like $381.23, $377.70 and several in the mid-$350s per share. Footnotes note price ranges for grouped trades, such as $352.78 to $360.85 and $367.22 to $367.78.

Was the MACOM (MTSI) insider sale made under a Rule 10b5-1 trading plan?

Yes. A footnote states the shares were sold under a sales plan adopted on August 11, 2025 and intended to comply with Rule 10b5-1. Such plans pre-schedule trades, making their timing more routine and less discretionary.

What is the 85-share acquisition reported by MACOM (MTSI) executive Hwang?

On May 15, 2026, he acquired 85 shares of MACOM common stock at $138.13 per share. A footnote explains these shares were purchased under the company’s Employee Stock Purchase Plan, a program allowing employees to buy stock on set terms.

What is the net share impact of this MACOM (MTSI) Form 4 for Hwang?

The transaction summary shows 2,595 shares sold and 85 shares acquired, resulting in a net share reduction of 2,595 for open-market activity. After these moves, his direct holdings stand at 32,376 shares of common stock.