Michael L Pfeiffer

Insider

First SEC filing: Nov. 12, 2025 · Latest: Nov. 12, 2025

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Insider at Companies where this person is a reporting insider.
Insider transactions Every share this person bought or sold, from Form 4 filings.
Derivatives Options and other derivative holdings reported by this person.

Insider at

AOSL selling Jan. 19, 2024

Insider transactions

0 buys (P) 0 sells (S) Net: $0 + 18 non-open-market transactions below last 12 months, based on the transactions shown below

Price change vs current quote, split-adjusted for corporate actions since the filing — not benchmarked, not annualized, not size-weighted

18 other filings hidden

Date	Ticker	Code	Shares	Price	Value	Owned after	Δ own	A/D	vs now
Nov. 11, 2025	AOSL	A	5,681	—	—	71,294 Direct	+8.66%	Acquired	(price as of 2026-08-20)
Nov. 7, 2024	AOSL	A	4,456	—	—	65,613 Direct	+7.29%	Acquired	(price as of 2026-08-20)
Jan. 19, 2024	AOSL	M	4,500	$7.21	$32,445	63,830 Direct	+7.58%	Acquired	271.7% (price as of 2026-08-20)
Jan. 19, 2024	AOSL	S 10b5-1	2,673	$27.34	$73,080	61,157 Direct	-4.19%	Disposed	-2.0% (price as of 2026-08-20)
Jan. 19, 2024	AOSL	M	4,500	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-20)
Jan. 18, 2024	AOSL	M	2,375	$7.21	$17,124	59,994 Direct	+4.12%	Acquired	271.7% (price as of 2026-08-20)
Jan. 18, 2024	AOSL	S 10b5-1	664	$26.68	$17,716	59,330 Direct	-1.11%	Disposed	0.4% (price as of 2026-08-20)
Jan. 18, 2024	AOSL	M	2,375	—	—	4,500 Direct	-34.55%	Disposed	(price as of 2026-08-20)
Nov. 9, 2023	AOSL	A	5,593	—	—	57,619 Direct	+10.75%	Acquired	(price as of 2026-08-20)
Nov. 29, 2022	AOSL	A	4,061	—	—	52,026 Direct	+8.47%	Acquired	(price as of 2026-08-20)
Nov. 11, 2021	AOSL	A	4,009	—	—	47,965 Direct	+9.12%	Acquired	(price as of 2026-08-20)
Nov. 12, 2020	AOSL	A	6,458	—	—	43,956 Direct	+17.22%	Acquired	(price as of 2026-08-20)
Nov. 7, 2019	AOSL	A	7,618	—	—	37,498 Direct	+25.50%	Acquired	(price as of 2026-08-20)
Nov. 9, 2018	AOSL	A	7,974	—	—	29,880 Direct	+36.40%	Acquired	(price as of 2026-08-20)
Nov. 8, 2017	AOSL	A	5,771	—	—	21,906 Direct	+35.77%	Acquired	(price as of 2026-08-20)
Nov. 9, 2016	AOSL	A	4,513	—	—	16,135 Direct	+38.83%	Acquired	(price as of 2026-08-20)
Nov. 9, 2015	AOSL	A	5,134	—	—	11,622 Direct	+79.13%	Acquired	(price as of 2026-08-20)
Nov. 10, 2014	AOSL	A	4,488	—	—	6,488 Direct	+224.40%	Acquired	(price as of 2026-08-20)
March 24, 2014	AOSL	A	2,000	—	—	2,000 Direct	—	Acquired	(price as of 2026-08-20)
Jan. 29, 2014	AOSL	A	6,875	—	—	6,875 Direct	—	Acquired	(price as of 2026-08-20)

P = Open-market purchase · S = Sale · A = Grant/award · M = Option exercise · G = Gift · F = Tax withholding

Insider transactions are not a recommendation; sales are often driven by liquidity or tax reasons.

Derivative holdings (Form 4 Table II)

Options, RSUs and convertible securities reported on Form 4 Table II.

Date	Ticker	Security	Underlying	Exercise price	Expiration	Shares	A/D
Jan. 19, 2024	AOSL	Share Option (Right to Buy)	Common Share (4,500)	$7.21	Jan. 28, 2024	4,500	Disposed
Jan. 18, 2024	AOSL	Share Option (Right to Buy)	Common Share (2,375)	$7.21	Jan. 28, 2024	2,375	Disposed
Jan. 29, 2014	AOSL	Share Option (right to buy)	Common Share (6,875)	$7.21	Jan. 28, 2024	6,875	Acquired

Exercise/conversion price is blank when not applicable (e.g. RSUs).