MACOM Technology Solutions CFO John Kober Executes Planned Stock Sale Under Rule 10b5-1

Executive Summary

On October 27, 2026, John Kober, Senior Vice President and Chief Financial Officer of MACOM Technology Solutions Holdings, Inc. (NASDAQ: MTSI), filed Form 4 reporting two dispositions of common stock:

1. Tax Withholding (Code F): On October 23, 2026, 428 shares were withheld by the issuer at $236.24 per share ($101,110.72) to cover tax obligations from RSU vesting.
2. Open Market Sale (Code S): On October 26, 2026, 1,027 shares were sold at $236.60 per share for gross proceeds of $242,988.20.

Following these transactions, Mr. Kober retains direct beneficial ownership of 34,405 shares of common stock.

Key Transaction Details

• 10b5-1 Trading Plan: The open-market sale of 1,027 shares was carried out under a pre-established Rule 10b5-1 trading plan adopted on August 14, 2025.
• Holding Impact: The 1,027-share sale represents approximately 2.9% of his post-vesting holdings.
• Direct Ownership Post-Transaction: 34,405 shares.

Market & Trading Significance

This transaction carries Low informational significance for investors. The sale was executed pursuant to a pre-arranged Rule 10b5-1 plan established over a year earlier, and the primary transaction was accompanied by standard automatic withholding for equity compensation tax liabilities. The transaction size is small relative to the insider's total equity holdings.