Diane G. Gerst

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 July 18, 2022

Insider transactions

0 buys (P) 0 sells (S) Net: $0 + 54 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

54 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	—	—	31,899 Direct	+34.28%	Acquired	(price as of 2026-08-20)
June 3, 2024	AMPH	A	3,076	—	—	18,634 Direct	+19.77%	Acquired	(price as of 2026-08-20)
June 3, 2024	AMPH	A	6,864	—	—	6,864 Direct	—	Acquired	(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	—	—	15,558 Direct	+21.15%	Acquired	(price as of 2026-08-20)
July 18, 2022	AMPH	M	1,520	—	—	1,336 Direct	-53.22%	Disposed	(price as of 2026-08-20)
July 18, 2022	AMPH	S 10b5-1	1,520	$37.23	$56,590	12,842 Direct	-10.58%	Disposed	-42.6% (price as of 2026-08-20)
July 18, 2022	AMPH	M	1,520	$20.08	$30,522	14,362 Direct	+11.84%	Acquired	6.5% (price as of 2026-08-20)
July 11, 2022	AMPH	M	1,521	—	—	2,856 Direct	-34.75%	Disposed	(price as of 2026-08-20)
July 11, 2022	AMPH	S 10b5-1	1,521	$36.26	$55,151	12,842 Direct	-10.59%	Disposed	-41.0% (price as of 2026-08-20)
July 11, 2022	AMPH	M	1,521	$20.08	$30,542	14,363 Direct	+11.84%	Acquired	6.5% (price as of 2026-08-20)
July 5, 2022	AMPH	M	1,813	—	—	4,377 Direct	-29.29%	Disposed	(price as of 2026-08-20)
July 5, 2022	AMPH	S 10b5-1	1,813	$35.00	$63,455	12,842 Direct	-12.37%	Disposed	-38.9% (price as of 2026-08-20)
July 5, 2022	AMPH	M	1,813	$20.08	$36,405	14,655 Direct	+14.12%	Acquired	6.5% (price as of 2026-08-20)
June 30, 2022	AMPH	M	1,813	—	—	6,190 Direct	-22.65%	Disposed	(price as of 2026-08-20)
June 30, 2022	AMPH	M	3,333	—	—	3,626 Direct	-47.89%	Disposed	(price as of 2026-08-20)
June 30, 2022	AMPH	S 10b5-1	5,146	$35.00	$180,110	12,842 Direct	-28.61%	Disposed	-38.9% (price as of 2026-08-20)
June 30, 2022	AMPH	M	1,813	$20.08	$36,405	17,988 Direct	+11.21%	Acquired	6.5% (price as of 2026-08-20)
June 30, 2022	AMPH	M	3,333	$20.03	$66,760	16,175 Direct	+25.95%	Acquired	6.7% (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	—	—	12,842 Direct	+47.97%	Acquired	(price as of 2026-08-20)
June 7, 2021	AMPH	A	3,009	—	—	8,679 Direct	+53.07%	Acquired	(price as of 2026-08-20)
June 7, 2021	AMPH	A	8,592	—	—	8,592 Direct	—	Acquired	(price as of 2026-08-20)
June 8, 2020	AMPH	A	8,003	—	—	8,003 Direct	—	Acquired	(price as of 2026-08-20)
June 8, 2020	AMPH	A	2,925	—	—	5,670 Direct	+106.56%	Acquired	(price as of 2026-08-20)
June 12, 2019	AMPH	A	6,959	—	—	6,959 Direct	—	Acquired	(price as of 2026-08-20)
June 12, 2019	AMPH	A	2,745	—	—	2,745 Direct	—	Acquired	(price as of 2026-08-20)
Dec. 19, 2017	AMPH	S 10b5-1	523	$19.48	$10,188	30,164 Direct	-1.70%	Disposed	9.8% (price as of 2026-08-20)
Dec. 12, 2017	AMPH	S 10b5-1	523	$18.96	$9,916	30,687 Direct	-1.68%	Disposed	12.8% (price as of 2026-08-20)
Nov. 28, 2017	AMPH	S 10b5-1	523	$18.15	$9,492	31,210 Direct	-1.65%	Disposed	17.8% (price as of 2026-08-20)
Nov. 21, 2017	AMPH	S 10b5-1	523	$18.81	$9,838	31,733 Direct	-1.62%	Disposed	13.7% (price as of 2026-08-20)
Nov. 15, 2017	AMPH	S 10b5-1	523	$17.77	$9,294	32,256 Direct	-1.60%	Disposed	20.3% (price as of 2026-08-20)
Nov. 7, 2017	AMPH	S 10b5-1	523	$17.93	$9,377	32,779 Direct	-1.57%	Disposed	19.2% (price as of 2026-08-20)
Oct. 24, 2017	AMPH	S 10b5-1	523	$18.29	$9,566	33,302 Direct	-1.55%	Disposed	16.9% (price as of 2026-08-20)
Oct. 17, 2017	AMPH	S 10b5-1	523	$18.48	$9,665	33,825 Direct	-1.52%	Disposed	15.7% (price as of 2026-08-20)
Oct. 5, 2017	AMPH	M	8,444	—	—	25,330 Direct	-25.00%	Disposed	(price as of 2026-08-20)
Oct. 5, 2017	AMPH	S 10b5-1	8,444	$18.87	$159,338	34,348 Direct	-19.73%	Disposed	13.3% (price as of 2026-08-20)
Oct. 5, 2017	AMPH	M	8,444	$11.33	$95,671	42,792 Direct	+24.58%	Acquired	88.7% (price as of 2026-08-20)
June 15, 2017	AMPH	F	146	$16.18	$2,362	34,348 Direct	-0.42%	Disposed	32.1% (price as of 2026-08-20)
April 14, 2017	AMPH	F	754	$14.80	$11,159	34,494 Direct	-2.14%	Disposed	44.5% (price as of 2026-08-20)
March 26, 2017	AMPH	F	614	$13.76	$8,449	35,248 Direct	-1.71%	Disposed	55.4% (price as of 2026-08-20)
March 17, 2017	AMPH	F	1,194	$13.75	$16,418	35,862 Direct	-3.22%	Disposed	55.5% (price as of 2026-08-20)
March 16, 2017	AMPH	A	27,088	—	—	27,088 Direct	—	Acquired	(price as of 2026-08-20)
March 16, 2017	AMPH	A	10,861	—	—	37,056 Direct	+41.46%	Acquired	(price as of 2026-08-20)
Dec. 15, 2016	AMPH	S	2,940	$20.51	$60,299	26,195 Direct	-10.09%	Disposed	4.2% (price as of 2026-08-20)
Aug. 19, 2016	AMPH	M	14,000	—	—	14,000 Direct	-50.00%	Disposed	(price as of 2026-08-20)
Aug. 19, 2016	AMPH	M	10,046	—	—	4,954 Direct	-66.97%	Disposed	(price as of 2026-08-20)
Aug. 19, 2016	AMPH	S 10b5-1	24,046	$19.28	$463,607	28,985 Direct	-45.34%	Disposed	10.9% (price as of 2026-08-20)
Aug. 19, 2016	AMPH	M	14,000	$10.93	$153,020	53,031 Direct	+35.87%	Acquired	95.6% (price as of 2026-08-20)
Aug. 19, 2016	AMPH	M	10,046	$14.23	$142,955	39,031 Direct	+34.66%	Acquired	50.2% (price as of 2026-08-20)
June 15, 2016	AMPH	F	146	$15.76	$2,301	28,985 Direct	-0.50%	Disposed	35.7% (price as of 2026-08-20)
May 18, 2016	AMPH	S	1,427	$13.97	$19,935	28,649 Direct	-4.74%	Disposed	53.0% (price as of 2026-08-20)
April 19, 2016	AMPH	M	5,607	—	—	6,183 Direct	-47.56%	Disposed	(price as of 2026-08-20)
April 19, 2016	AMPH	S 10b5-1	5,607	$13.04	$73,115	30,076 Direct	-15.71%	Disposed	64.0% (price as of 2026-08-20)
April 19, 2016	AMPH	M	5,607	$10.48	$58,761	35,683 Direct	+18.64%	Acquired	104.0% (price as of 2026-08-20)
April 18, 2016	AMPH	M	8,210	—	—	11,790 Direct	-41.05%	Disposed	(price as of 2026-08-20)
April 18, 2016	AMPH	M	6,000	—	—	9,000 Direct	-40.00%	Disposed	(price as of 2026-08-20)
April 18, 2016	AMPH	S 10b5-1	15,637	$12.83	$200,623	30,076 Direct	-34.21%	Disposed	66.6% (price as of 2026-08-20)
April 18, 2016	AMPH	M	6,000	$11.41	$68,460	45,713 Direct	+15.11%	Acquired	87.4% (price as of 2026-08-20)
April 18, 2016	AMPH	M	8,210	$10.48	$86,041	39,713 Direct	+26.06%	Acquired	104.0% (price as of 2026-08-20)
April 14, 2016	AMPH	F	741	$12.66	$9,381	31,503 Direct	-2.30%	Disposed	68.9% (price as of 2026-08-20)
March 26, 2016	AMPH	F	614	$11.96	$7,343	32,244 Direct	-1.87%	Disposed	78.8% (price as of 2026-08-20)
March 17, 2016	AMPH	A	33,774	—	—	33,774 Direct	—	Acquired	(price as of 2026-08-20)
March 17, 2016	AMPH	A	11,253	—	—	32,858 Direct	+52.09%	Acquired	(price as of 2026-08-20)
June 15, 2015	AMPH	A	4,685	—	—	4,685 Direct	—	Acquired	(price as of 2026-08-20)
June 15, 2015	AMPH	A	1,544	—	—	20,178 Direct	+8.29%	Acquired	(price as of 2026-08-20)
April 14, 2015	AMPH	F	862	$15.22	$13,120	18,634 Direct	-4.42%	Disposed	40.5% (price as of 2026-08-20)
April 9, 2015	AMPH	A	10,000	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-20)
April 8, 2015	AMPH	S 10b5-1	10,000	$15.79	$157,900	19,496 Direct	-33.90%	Disposed	35.4% (price as of 2026-08-20)
April 8, 2015	AMPH	M	10,000	$14.80	$148,000	29,496 Direct	+51.29%	Acquired	44.5% (price as of 2026-08-20)
March 26, 2015	AMPH	A	20,028	—	—	20,028 Direct	-50.00%	Disposed	(price as of 2026-08-20)
March 26, 2015	AMPH	A	6,688	—	—	19,496 Direct	+52.22%	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
June 1, 2026	AMPH	Stock Option (right to buy)	Common Stock (17,365)	$18.42	June 1, 2036	17,365	Acquired
June 3, 2024	AMPH	Stock Option (right to buy)	Common Stock (6,864)	$42.25	June 3, 2034	6,864	Acquired
June 5, 2023	AMPH	Stock Option (right to buy)	Common Stock (7,016)	$46.01	June 5, 2031	7,016	Acquired
July 18, 2022	AMPH	Stock Option (right to buy)	Common Stock (1,520)	$20.08	June 8, 2028	1,520	Disposed
July 11, 2022	AMPH	Stock Option (right to buy)	Common Stock (1,521)	$20.08	June 8, 2028	1,521	Disposed
July 5, 2022	AMPH	Stock Option (right to buy)	Common Stock (1,813)	$20.08	June 8, 2028	1,813	Disposed
June 30, 2022	AMPH	Stock Option (right to buy)	Common Stock (1,813)	$20.08	June 8, 2028	1,813	Disposed
June 30, 2022	AMPH	Stock Option (right to buy)	Common Stock (3,333)	$20.03	June 12, 2027	3,333	Disposed
June 10, 2022	AMPH	Stock Option (right to buy)	Common Stock (10,984)	$30.02	June 10, 2030	10,984	Acquired
June 7, 2021	AMPH	Stock Option (right to buy)	Common Stock (8,592)	$19.52	June 7, 2029	8,592	Acquired
June 8, 2020	AMPH	Stock Option (right to buy)	Common Stock (8,003)	$20.08	June 8, 2028	8,003	Acquired
June 12, 2019	AMPH	Stock Option (right to buy)	Common Stock (6,959)	$20.03	June 12, 2027	6,959	Acquired
Oct. 5, 2017	AMPH	Employee Stock Option (right to buy)	Common Stock (8,444)	$11.33	March 17, 2026	8,444	Disposed
March 16, 2017	AMPH	Employee Stock Option (right to buy)	Common Stock (27,088)	$13.35	March 16, 2027	27,088	Acquired
Aug. 19, 2016	AMPH	Employee Stock Option (right to buy)	Common Stock (14,000)	$10.93	July 30, 2023	14,000	Disposed
Aug. 19, 2016	AMPH	Employee Stock Option (right to buy)	Common Stock (10,046)	$14.23	Dec. 22, 2021	10,046	Disposed
April 19, 2016	AMPH	Employee Stock Option (right to buy)	Common Stock (5,607)	$10.48	Nov. 7, 2022	5,607	Disposed
April 18, 2016	AMPH	Employee Stock Option (right to buy)	Common Stock (8,210)	$10.48	Nov. 7, 2022	8,210	Disposed
April 18, 2016	AMPH	Employee Stock Option (right to buy)	Common Stock (6,000)	$11.41	March 8, 2021	6,000	Disposed
March 17, 2016	AMPH	Employee Stock Option (right to buy)	Common Stock (33,774)	$11.33	March 17, 2026	33,774	Acquired
June 15, 2015	AMPH	Employee Stock Option (right to buy)	Common Stock (4,685)	$16.19	June 15, 2025	4,685	Acquired
April 9, 2015	AMPH	Employee Stock Option (right to buy)	Common Stock (10,000)	$14.80	May 15, 2025	10,000	Disposed
March 26, 2015	AMPH	Employee Stock Option (right to buy)	Common Stock (20,028)	$14.95	March 26, 2025	20,028	Disposed

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

Initial ownership (Form 3) 22 holdings

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

Date	Ticker	Security	Shares	Ownership
June 24, 2014	AMPH	Common Stock	4,728	Direct
June 24, 2014	AMPH	Common Stock	—	Direct
June 24, 2014	AMPH	Stock Option (Right to Buy)→ Common Stock (10,000)	10,000	Direct
June 24, 2014	AMPH	Stock Option (Right to Buy)→ Common Stock (9,782)	9,782	Direct
June 24, 2014	AMPH	Stock Option (Right to Buy)→ Common Stock (218)	218	Direct
June 24, 2014	AMPH	Stock Option (Right to Buy)→ Common Stock (4,000)	4,000	Direct
June 24, 2014	AMPH	Stock Option (Right to Buy)→ Common Stock (1,000)	1,000	Direct
June 24, 2014	AMPH	Stock Option (Right to Buy)→ Common Stock (8,767)	8,767	Direct
June 24, 2014	AMPH	Stock Option (Right to Buy)→ Common Stock (5,233)	5,233	Direct
June 24, 2014	AMPH	Stock Option (Right to Buy)→ Common Stock (2,522)	2,522	Direct
June 24, 2014	AMPH	Stock Option (Right to Buy)→ Common Stock (8,478)	8,478	Direct
June 24, 2014	AMPH	Stock Option (Right to Buy)→ Common Stock (3,500)	3,500	Direct
June 24, 2014	AMPH	Stock Option (Right to Buy)→ Common Stock (8,500)	8,500	Direct
June 24, 2014	AMPH	Stock Option (Right to Buy)→ Common Stock (9,000)	9,000	Direct
June 24, 2014	AMPH	Stock Option (Right to Buy)→ Common Stock (6,000)	6,000	Direct
June 24, 2014	AMPH	Stock Option (Right to Buy)→ Common Stock (4,954)	4,954	Direct
June 24, 2014	AMPH	Stock Option (Right to Buy)→ Common Stock (10,046)	10,046	Direct
June 24, 2014	AMPH	Stock Option (Right to Buy)→ Common Stock (6,183)	6,183	Direct
June 24, 2014	AMPH	Stock Option (Right to Buy)→ Common Stock (13,817)	13,817	Direct
June 24, 2014	AMPH	Stock Option (Right to Buy)→ Common Stock (8,223)	8,223	Direct
June 24, 2014	AMPH	Stock Option (Right to Buy)→ Common Stock (19,777)	19,777	Direct
June 24, 2014	AMPH	Stock Option (Right to Buy)→ Common Stock (11,775)	11,775	Direct