Semtech CEO Hong Q. Hou Reports 10b5-1 Share Sale and RSU Vesting

Executive Summary

On October 5, 2026, Semtech Corp ($SMTC) filed a Form 4 disclosing insider activity by President and Chief Executive Officer Hong Q. Hou. The filing reflects an RSU vesting, associated statutory tax withholding, and a modest planned open-market sale under Rule 10b5-1.

Transaction Breakdown

• RSU Settlement (October 1, 2026): Dr. Hou acquired 6,483 shares of common stock at $0.00 upon the quarterly vesting of a restricted stock unit grant.
• Tax Withholding (October 1, 2026): Semtech withheld 3,299 shares at $178.35 per share ($588,376.65 total) to satisfy mandatory tax obligations associated with the RSU release.
• Open Market Sale (October 2, 2026): Dr. Hou sold 2,000 shares at a price of $191.21 per share, realizing gross proceeds of $382,420.00. This sale was conducted pursuant to a pre-established Rule 10b5-1 trading plan adopted on December 17, 2025.

Holdings Context

Following these transactions, Dr. Hou continues to hold 65,976 shares of Semtech common stock directly, along with 19,450 remaining unvested restricted stock units. The 2,000 shares sold represent less than 3% of his equity holdings prior to the sale.

Market Significance

This activity is assessed as Low trading significance. The sale was executed under a Rule 10b5-1 plan established roughly ten months prior, and the majority of shares moved were directly tied to routine RSU vesting and required tax withholdings.