Chang Stephen Chunping 4

4 · ALPHA & OMEGA SEMICONDUCTOR Ltd · Filed Apr 20, 2026

AI-generated summary of this filing

Updated Apr 20, 2026

AOSL CEO Stephen Chang Sells 14,884 Shares

What Happened

Stephen (Chunping) Chang, CEO of Alpha & Omega Semiconductor (AOSL), sold a total of 14,884 shares in open-market transactions on April 17, 2026. The sales were in three tranches: 1,492 shares at $32.90 ($49,087), 3,481 shares at $33.90 ($118,006), and 9,911 shares at $34.90 ($345,894), for aggregate proceeds of $512,987. These were disposals (sales), often routine for insiders, and were executed under a prearranged Rule 10b5-1 trading plan.

Key Details

Transaction dates and prices:
- 2026-04-17: 1,492 shares @ $32.90 = $49,087
- 2026-04-17: 3,481 shares @ $33.90 = $118,006
- 2026-04-17: 9,911 shares @ $34.90 = $345,894
Total shares sold: 14,884; total proceeds: $512,987 (~$513K).
Sales were effected pursuant to a Rule 10b5-1 trading plan adopted Sept 8, 2025 (footnote F1).
Footnote on prices: reported prices are exact sale prices (F2).
Ownership notes disclosed in the filing (unvested awards included):
- 22,500 unvested Market-Based PSUs (granted July 1, 2018) (F3)
- 79,375 unvested PSUs (granted Mar 15, 2024 & Mar 17, 2025) (F4)
- 161,250 RSU shares (granted Mar 15, 2023; Mar 15, 2024; Mar 17, 2025; Mar 16, 2026) and 67,500 unvested PSUs from Mar 16, 2026 excluded from that RSU count (F5)
Filing timeliness: Report covers trades on Apr 17, 2026 and was filed Apr 20, 2026 — within the standard Form 4 reporting window (not indicated as late).

Context

These sales were made under a 10b5-1 plan, meaning they were prearranged and scheduled in advance of the trades; such plans often indicate routine disposition rather than real-time trading based on nonpublic information. For retail investors, purchases generally signal stronger insider conviction than sales; sales can be for many personal or diversification reasons and are not by themselves a directional signal.

Form 4

Period: 2026-04-17

DirectorChief Executive Officer

Transactions

Sale
Common Share
[F1][F2][F3][F4][F5]
2026-04-17$32.90/sh−1,492$49,087→ 649,293 total
Sale
Common Share
[F1][F2][F3][F4][F5]
2026-04-17$33.90/sh−3,481$118,006→ 645,812 total
Sale
Common Share
[F1][F2][F3][F4][F5]
2026-04-17$34.90/sh−9,911$345,894→ 635,901 total

Footnotes (5)

[F1]The sales were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on September 8, 2025.
[F2]The price reported in Column 4 is the exact price at which all shares were sold.
[F3]Includes 22,500 unvested shares subject to the Market-Based Performance Share Unit (MSU) granted on July 1, 2018 which are subject to vesting upon satisfaction of service-based vesting conditions by the Reporting Person.
[F4]Includes 79,375 unvested shares subject to the Performance Share Unit (PSU) granted on March 15, 2024 and March 17, 2025 which are subject to vesting upon satisfaction of service-based vesting conditions by the Reporting Person.
[F5]Includes an aggregate of 161,250 shares subject to Restricted Share Unit awards (RSU) granted on March 15, 2023, March 15, 2024, March 17, 2025, and March 16, 2026 which will be issued as such units vest in accordance with their terms, and excludes 67,500 unvested common shares subject to the PSU granted on March 16, 2026, which may become vested upon achievement of certain corporate performance goals in the future.

Signature

/s/ Yanbing Hong, attorney-in-fact for Stephen Chang|2026-04-20

1 file