Chang Mike F 4

What Happened
Mike Chang, a reported 10% owner of Alpha & Omega Semiconductor Ltd (AOSL), made an open-market/private purchase of 33,727 common shares on March 9, 2026 at $19.00 per share, for a total purchase value of $640,813. This was a direct purchase (transaction code P), which is a buy rather than a sale and thus represents an acquisition of stock by an insider.

Key Details

• Transaction date and price: 2026-03-09 — 33,727 shares at $19.00 each (total $640,813). Footnote F1 notes the reported price is exact for all shares.
• Transaction type: Open market or private purchase (code P).
• Shares owned after transaction: Not specified in this Form 4 filing.
• Notable footnotes:
  • F2: Includes 41,670 unvested shares subject to Performance Share Units (PSUs) from 2022 and 2024, vesting based on service.
  • F3: Includes 45,000 unvested shares subject to MSU with service-based vesting.
  • F4: Includes 86,875 shares subject to Restricted Share Units (RSUs) granted across 2022–2025 (vesting schedule applies) and excludes 22,500 unvested PSU shares from March 17, 2025 that vest on future performance.
• Filing date: Form 4 filed 2026-03-10 (one day after the reported transaction); the filing does not indicate a late filing.

Context
As a 10% owner, Chang is a significant shareholder — purchases by large shareholders can be of interest to investors but are not the same as routine executive compensation transactions. The filing shows this was a straight purchase; there is no indication of option exercise, sale, gift, or tax-withholding in this transaction. The listed footnotes show various unvested awards that remain subject to vesting and performance conditions and are separate from the shares acquired on March 9.