Michael L. Pfeiffer

Michael L. Pfeiffer: Director at Alpha & Omega Semiconductor. What Michael L. Pfeiffer holds in an AI or semiconductor company tracked on Silicon Floor, from their SEC filings, broken down: the shares held and how, then any restricted shares, options or other rights declared.

Alpha & Omega Semiconductor (AOSL)

Michael L. Pfeiffer holds 71,294 Alpha & Omega Semiconductor shares (0.24% of the company), worth about $1.9M at the last price, according to the Form 4 of Nov 11, 2025.

• Shares held: 71,294 (0.24%), $1.9M — Held in their own name.

Declarations

• Alpha & Omega Semiconductor (AOSL) — Form 4 of Nov 11, 2025: grant or award of 5,681; 71,294 shares after 0001387467-25-000073
• Alpha & Omega Semiconductor (AOSL) — Form 4 of Nov 7, 2024: grant or award of 4,456; 65,613 shares after 0001387467-24-000104

Sources: SEC Schedules 13D and 13G (stakes above 5%, which count everything a person votes or can acquire within 60 days) and Forms 3, 4 and 5 (the shares a director, officer or 10% owner holds, filed within two business days of each trade). Values at the last price.

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