ZASLOFF MICHAEL A

Insider

First SEC filing: June 24, 2014 · Latest: June 24, 2014

On this page

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.
Initial holdings The stakes this person held when they first started reporting.

Insider at

AMPH selling Aug. 15, 2023

Insider transactions

0 buys (P) 0 sells (S) Net: $0 + 50 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

50 other filings hidden

Date	Ticker	Code	Shares	Price	Value	Owned after	Δ own	A/D	vs now
June 1, 2026	AMPH	A	17,365	—	—	17,365 Direct	—	Acquired	(price as of 2026-08-20)
June 1, 2026	AMPH	A	8,143	—	—	37,667 Direct	+27.58%	Acquired	(price as of 2026-08-20)
Aug. 15, 2023	AMPH	S	12,759	$57.22	$730,070	33,826 Direct	-27.39%	Disposed	-62.6% (price as of 2026-08-20)
June 5, 2023	AMPH	A	7,016	—	—	7,016 Direct	—	Acquired	(price as of 2026-08-20)
June 5, 2023	AMPH	A	2,716	—	—	46,585 Direct	+6.19%	Acquired	(price as of 2026-08-20)
May 15, 2023	AMPH	S	7,500	$42.18	$316,350	43,869 Direct	-14.60%	Disposed	-49.3% (price as of 2026-08-20)
June 10, 2022	AMPH	A	10,984	—	—	10,984 Direct	—	Acquired	(price as of 2026-08-20)
June 10, 2022	AMPH	A	4,163	—	—	51,369 Direct	+8.82%	Acquired	(price as of 2026-08-20)
May 16, 2022	AMPH	M	10,291	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-20)
May 16, 2022	AMPH	S	10,291	$35.61	$366,463	47,206 Direct	-17.90%	Disposed	-40.0% (price as of 2026-08-20)
May 16, 2022	AMPH	M	10,291	$17.11	$176,079	57,497 Direct	+21.80%	Acquired	25.0% (price as of 2026-08-20)
March 16, 2022	AMPH	M	10,000	—	—	10,291 Direct	-49.28%	Disposed	(price as of 2026-08-20)
March 16, 2022	AMPH	S	10,000	$33.71	$337,100	47,206 Direct	-17.48%	Disposed	-36.6% (price as of 2026-08-20)
March 16, 2022	AMPH	M	10,000	$17.11	$171,100	57,206 Direct	+21.18%	Acquired	25.0% (price as of 2026-08-20)
June 7, 2021	AMPH	A	17,182	—	—	17,182 Direct	—	Acquired	(price as of 2026-08-20)
June 7, 2021	AMPH	A	6,019	—	—	47,206 Direct	+14.61%	Acquired	(price as of 2026-08-20)
May 13, 2021	AMPH	M	25,827	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-20)
May 13, 2021	AMPH	S	25,827	$19.34	$499,494	41,187 Direct	-38.54%	Disposed	10.5% (price as of 2026-08-20)
May 13, 2021	AMPH	M	25,827	$16.43	$424,338	67,014 Direct	+62.71%	Acquired	30.1% (price as of 2026-08-20)
June 8, 2020	AMPH	A	16,004	—	—	16,004 Direct	—	Acquired	(price as of 2026-08-20)
June 8, 2020	AMPH	A	5,851	—	—	41,187 Direct	+16.56%	Acquired	(price as of 2026-08-20)
May 15, 2020	AMPH	M	22,950	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-20)
May 15, 2020	AMPH	S	22,950	$18.03	$413,788	35,336 Direct	-39.37%	Disposed	18.6% (price as of 2026-08-20)
May 15, 2020	AMPH	M	22,950	$15.11	$346,774	58,286 Direct	+64.95%	Acquired	41.5% (price as of 2026-08-20)
May 14, 2020	AMPH	M	14,832	—	—	22,950 Direct	-39.26%	Disposed	(price as of 2026-08-20)
May 14, 2020	AMPH	S	14,832	$18.00	$266,976	35,336 Direct	-29.56%	Disposed	18.8% (price as of 2026-08-20)
May 14, 2020	AMPH	M	14,832	$15.11	$224,112	50,168 Direct	+41.97%	Acquired	41.5% (price as of 2026-08-20)
May 12, 2020	AMPH	M	10,000	—	—	37,782 Direct	-20.93%	Disposed	(price as of 2026-08-20)
May 12, 2020	AMPH	S	10,000	$19.00	$190,000	35,336 Direct	-22.06%	Disposed	12.5% (price as of 2026-08-20)
May 12, 2020	AMPH	M	10,000	$15.11	$151,100	45,336 Direct	+28.30%	Acquired	41.5% (price as of 2026-08-20)
June 12, 2019	AMPH	A	13,915	—	—	13,915 Direct	—	Acquired	(price as of 2026-08-20)
June 12, 2019	AMPH	A	5,491	—	—	35,336 Direct	+18.40%	Acquired	(price as of 2026-08-20)
Nov. 14, 2018	AMPH	M	29,278	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-20)
Nov. 14, 2018	AMPH	S	29,278	$20.39	$596,978	29,845 Direct	-49.52%	Disposed	4.9% (price as of 2026-08-20)
Nov. 14, 2018	AMPH	M	29,278	$14.66	$429,215	59,123 Direct	+98.10%	Acquired	45.8% (price as of 2026-08-20)
June 12, 2018	AMPH	S	15,000	$16.52	$247,800	29,845 Direct	-33.45%	Disposed	29.4% (price as of 2026-08-20)
June 7, 2018	AMPH	A	16,679	—	—	16,679 Direct	—	Acquired	(price as of 2026-08-20)
June 7, 2018	AMPH	A	6,590	—	—	44,845 Direct	+17.23%	Acquired	(price as of 2026-08-20)
Oct. 2, 2017	AMPH	M	63,624	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-20)
Oct. 2, 2017	AMPH	S 10b5-1	63,624	$18.18	$1,156,684	38,255 Direct	-62.45%	Disposed	17.6% (price as of 2026-08-20)
Oct. 2, 2017	AMPH	M	63,624	$10.77	$685,230	101,879 Direct	+166.32%	Acquired	98.5% (price as of 2026-08-20)
June 8, 2017	AMPH	A	20,291	—	—	20,291 Direct	—	Acquired	(price as of 2026-08-20)
June 8, 2017	AMPH	A	5,844	—	—	38,255 Direct	+18.03%	Acquired	(price as of 2026-08-20)
June 1, 2017	AMPH	M	15,000	—	—	63,624 Direct	-19.08%	Disposed	(price as of 2026-08-20)
June 1, 2017	AMPH	S	15,000	$17.01	$255,150	32,411 Direct	-31.64%	Disposed	25.7% (price as of 2026-08-20)
June 1, 2017	AMPH	M	15,000	$10.77	$161,550	47,411 Direct	+46.28%	Acquired	98.5% (price as of 2026-08-20)
Aug. 15, 2016	AMPH	M	17,400	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-20)
Aug. 15, 2016	AMPH	S	17,400	$18.22	$317,028	32,411 Direct	-34.93%	Disposed	17.3% (price as of 2026-08-20)
Aug. 15, 2016	AMPH	M	17,400	$14.23	$247,602	49,811 Direct	+53.69%	Acquired	50.2% (price as of 2026-08-20)
Aug. 12, 2016	AMPH	M	20,594	—	—	17,400 Direct	-54.20%	Disposed	(price as of 2026-08-20)
Aug. 12, 2016	AMPH	M	10,381	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-20)
Aug. 12, 2016	AMPH	S	30,975	$18.12	$561,267	32,411 Direct	-48.87%	Disposed	18.0% (price as of 2026-08-20)
Aug. 12, 2016	AMPH	M	20,594	$14.23	$293,053	63,386 Direct	+48.13%	Acquired	50.2% (price as of 2026-08-20)
Aug. 12, 2016	AMPH	M	10,381	$15.23	$158,103	42,792 Direct	+32.03%	Acquired	40.4% (price as of 2026-08-20)
June 9, 2016	AMPH	A	25,827	—	—	25,827 Direct	—	Acquired	(price as of 2026-08-20)
June 9, 2016	AMPH	A	6,086	—	—	32,411 Direct	+23.12%	Acquired	(price as of 2026-08-20)
Dec. 17, 2015	AMPH	M	14,232	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-20)
Dec. 17, 2015	AMPH	S 10b5-1	14,232	$14.20	$202,094	26,325 Direct	-35.09%	Disposed	50.6% (price as of 2026-08-20)
Dec. 17, 2015	AMPH	M	14,232	$11.68	$166,230	40,557 Direct	+54.06%	Acquired	83.0% (price as of 2026-08-20)
Dec. 16, 2015	AMPH	M	16,538	—	—	14,232 Direct	-53.75%	Disposed	(price as of 2026-08-20)
Dec. 16, 2015	AMPH	S 10b5-1	16,538	$14.19	$234,674	26,325 Direct	-38.58%	Disposed	50.7% (price as of 2026-08-20)
Dec. 16, 2015	AMPH	M	16,538	$11.68	$193,164	42,863 Direct	+62.82%	Acquired	83.0% (price as of 2026-08-20)
July 17, 2015	AMPH	M	7,692	—	—	30,770 Direct	-20.00%	Disposed	(price as of 2026-08-20)
July 17, 2015	AMPH	S 10b5-1	7,692	$17.41	$133,918	26,325 Direct	-22.61%	Disposed	22.8% (price as of 2026-08-20)
July 17, 2015	AMPH	M	7,692	$11.68	$89,843	34,017 Direct	+29.22%	Acquired	83.0% (price as of 2026-08-20)
May 27, 2015	AMPH	A	8,686	—	—	26,325 Direct	+49.24%	Acquired	(price as of 2026-08-20)
May 27, 2015	AMPH	A	47,782	—	—	47,782 Direct	—	Acquired	(price as of 2026-08-20)
Aug. 19, 2014	AMPH	P	3,500	$10.00	$35,000	17,639 Direct	+24.75%	Acquired	113.8% (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
June 1, 2026	AMPH	Common Stock	Common Stock (17,365)	$18.42	June 1, 2036	17,365	Acquired
June 5, 2023	AMPH	Stock Option (right to buy)	Common Stock (7,016)	$46.01	June 5, 2031	7,016	Acquired
June 10, 2022	AMPH	Stock Option (right to buy)	Common Stock (10,984)	$30.02	June 10, 2030	10,984	Acquired
May 16, 2022	AMPH	Stock Option (right to buy)	Common Stock (10,291)	$17.11	June 8, 2022	10,291	Disposed
March 16, 2022	AMPH	Stock Option (right to buy)	Common Stock (10,000)	$17.11	June 8, 2022	10,000	Disposed
June 7, 2021	AMPH	Stock Option (right to buy)	Common Stock (17,182)	$19.52	June 7, 2029	17,182	Acquired
May 13, 2021	AMPH	Stock Option (right to buy)	Common Stock (25,827)	$16.43	June 9, 2021	25,827	Disposed
June 8, 2020	AMPH	Stock Option (right to buy)	Common Stock (16,004)	$20.08	June 8, 2028	16,004	Acquired
May 15, 2020	AMPH	Stock Option (right to buy)	Common Stock (22,950)	$15.11	May 27, 2020	22,950	Disposed
May 14, 2020	AMPH	Stock Option (right to buy)	Common Stock (14,832)	$15.11	May 27, 2020	14,832	Disposed
May 12, 2020	AMPH	Stock Option (right to buy)	Common Stock (10,000)	$15.11	May 27, 2020	10,000	Disposed
June 12, 2019	AMPH	Stock Option (right to buy)	Common Stock (13,915)	$20.03	June 12, 2027	13,915	Acquired
Nov. 14, 2018	AMPH	Stock Option (right to buy)	Common Stock (29,278)	$14.66	Dec. 20, 2018	29,278	Disposed
June 7, 2018	AMPH	Stock Option (right to buy)	Common Stock (16,679)	$16.69	June 7, 2026	16,679	Acquired
Oct. 2, 2017	AMPH	Stock Option (right to buy)	Common Stock (63,624)	$10.77	Dec. 15, 2017	63,624	Disposed
June 8, 2017	AMPH	Stock Option (right to buy)	Common Stock (20,291)	$17.11	June 8, 2022	20,291	Acquired
June 1, 2017	AMPH	Stock Option (right to buy)	Common Stock (15,000)	$10.77	Dec. 15, 2017	15,000	Disposed
Aug. 15, 2016	AMPH	Stock Option (right to buy)	Common Stock (17,400)	$14.23	Dec. 10, 2016	17,400	Disposed
Aug. 12, 2016	AMPH	Stock Option (right to buy)	Common Stock (20,594)	$14.23	Dec. 10, 2016	20,594	Disposed
Aug. 12, 2016	AMPH	Stock Option (right to buy)	Common Stock (10,381)	$15.23	Oct. 3, 2016	10,381	Disposed
June 9, 2016	AMPH	Stock Option (right to buy)	Common Stock (25,827)	$16.43	June 9, 2021	25,827	Acquired
Dec. 17, 2015	AMPH	Stock Option (right to buy)	Common Stock (14,232)	$11.68	Dec. 18, 2015	14,232	Disposed
Dec. 16, 2015	AMPH	Stock Option (right to buy)	Common Stock (16,538)	$11.68	Dec. 18, 2015	16,538	Disposed
July 17, 2015	AMPH	Stock Option (right to buy)	Common Stock (7,692)	$11.68	Dec. 18, 2015	7,692	Disposed
May 27, 2015	AMPH	Stock Option (right to buy)	Common Stock (47,782)	$15.11	May 27, 2020	47,782	Acquired

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

Initial ownership (Form 3) 7 holdings

Securities held when first becoming an insider, per SEC Form 3.

Date	Ticker	Security	Shares	Ownership
June 24, 2014	AMPH	Common Stock	8,682	Direct
June 24, 2014	AMPH	Common Stock	—	Direct
June 24, 2014	AMPH	Stock Option (Right to Buy)→ Common Stock (38,462)	38,462	Direct
June 24, 2014	AMPH	Stock Option (Right to Buy)→ Common Stock (10,381)	10,381	Direct
June 24, 2014	AMPH	Stock Option (Right to Buy)→ Common Stock (37,994)	37,994	Direct
June 24, 2014	AMPH	Stock Option (Right to Buy)→ Common Stock (78,624)	78,624	Direct
June 24, 2014	AMPH	Stock Option (Right to Buy)→ Common Stock (29,278)	29,278	Direct