Understand Stock

$AMPH

$17.90 -$0.55 (2.98%)

Deep Research with AI Research

Overview

$AMPH Overview Financials SEC Filings Executives News

Specialized Tools

Valuations P Insider Transactions P Congressional Trades P

Insider Transactions

Insider Transaction Summary

Physics & Chemistry Laboratories, Inc. Applied

7,461,594 shares

Net: 0 B/S: -

Physics Chemistry Laboratories, Inc. Applied

7,327,679 shares

Net: 0 B/S: -

Jack Y. Zhang

6,827,679 shares

Net: 0 B/S: -

Mary Z. Luo

2,990,052 shares

Net: +342,393 B/S: ∞

Richard Koo

259,289 shares

Net: 0 B/S: -

Jason B. Shandell

179,276 shares

Net: 0 B/S: -

WILLIAM J PETERS

175,063 shares

Net: +49,533 B/S: ∞

Rong Zhou

171,554 shares

Net: +33,511 B/S: 5.03

Howard Lee

151,976 shares

Net: 0 B/S: -

Yakob Liawatidewi

121,892 shares

Net: +30,438 B/S: ∞

Floyd F. Petersen

71,368 shares

Net: -6,663 B/S: 0.71

RICHARD K PRINS

35,183 shares

Net: 0 B/S: 1.0

Stephen B. Shohet

30,706 shares

Net: 0 B/S: -

MICHAEL A ZASLOFF

29,524 shares

Net: 0 B/S: -

Diane G. Gerst

23,756 shares

Net: 0 B/S: -

David Maris

19,170 shares

Net: 0 B/S: -

Gayle Deflin

10,914 shares

Net: 0 B/S: -

David Russell Gaugh

6,304 shares

Net: +6,304 B/S: ∞

Insider Name	Current Shares	Net Change (1yr)	Buy/Sell Ratio
Physics & Chemistry Laboratories, Inc. Applied	7,461,594	0	-
Physics Chemistry Laboratories, Inc. Applied	7,327,679	0	-
Jack Y. Zhang	6,827,679	0	-
Mary Z. Luo	2,990,052	+342,393	∞
Richard Koo	259,289	0	-
Jason B. Shandell	179,276	0	-
WILLIAM J PETERS	175,063	+49,533	∞
Rong Zhou	171,554	+33,511	5.03
Howard Lee	151,976	0	-
Yakob Liawatidewi	121,892	+30,438	∞
Floyd F. Petersen	71,368	-6,663	0.71
RICHARD K PRINS	35,183	0	1.0
Stephen B. Shohet	30,706	0	-
MICHAEL A ZASLOFF	29,524	0	-
Diane G. Gerst	23,756	0	-
David Maris	19,170	0	-
Gayle Deflin	10,914	0	-
David Russell Gaugh	6,304	+6,304	∞

Individual Transactions

March 15, 2026

Yakob Liawatidewi

Tax Payment

Change: -1,033

Price: $18.18

Shares: 121,892

Value: -$18,779

Rong Zhou

Tax Payment

Change: -1,225

Price: $18.18

Shares: 171,554

Value: -$22,270

Mary Z. Luo

Tax Payment

Change: -9,784

Price: $18.18

Shares: 2,990,052

Value: -$177,873

WILLIAM J PETERS

Tax Payment

Change: -1,973

Price: $18.18

Shares: 175,063

Value: -$35,869

Insider	Filing Date	Transaction	Shares	Change	Price	Value
Yakob Liawatidewi	Mar 17	Tax Payment (F) Tax Payment	121,892	-1,033	$18.18	-$18,779
Rong Zhou	Mar 17	Tax Payment (F) Tax Payment	171,554	-1,225	$18.18	-$22,270
Mary Z. Luo	Mar 17	Tax Payment (F) Tax Payment	2,990,052	-9,784	$18.18	-$177,873
WILLIAM J PETERS	Mar 17	Tax Payment (F) Tax Payment	175,063	-1,973	$18.18	-$35,869

March 10, 2026

Yakob Liawatidewi

Tax Payment

Change: -1,870

Price: $18.91

Shares: 122,925

Value: -$35,361

Rong Zhou

Tax Payment

Change: -2,215

Price: $18.91

Shares: 172,779

Value: -$41,885

Mary Z. Luo

Tax Payment

Change: -14,785

Price: $18.91

Shares: 2,999,836

Value: -$279,584

WILLIAM J PETERS

Tax Payment

Change: -3,297

Price: $18.91

Shares: 177,036

Value: -$62,346

Insider	Filing Date	Transaction	Shares	Change	Price	Value
Yakob Liawatidewi	Mar 11	Tax Payment (F) Tax Payment	122,925	-1,870	$18.91	-$35,361
Rong Zhou	Mar 11	Tax Payment (F) Tax Payment	172,779	-2,215	$18.91	-$41,885
Mary Z. Luo	Mar 11	Tax Payment (F) Tax Payment	2,999,836	-14,785	$18.91	-$279,584
WILLIAM J PETERS	Mar 11	Tax Payment (F) Tax Payment	177,036	-3,297	$18.91	-$62,346

March 09, 2026

Yakob Liawatidewi

Grant/Award Acquisition

Change: +35,450

Price: $0.00

Shares: 124,795

Value: +$0

Rong Zhou

Grant/Award Acquisition

Change: +39,432

Price: $0.00

Shares: 174,994

Value: +$0

Mary Z. Luo

Grant/Award Acquisition

Change: +180,504

Price: $0.00

Shares: 3,014,621

Value: +$0

WILLIAM J PETERS

Grant/Award Acquisition

Change: +58,693

Price: $0.00

Shares: 180,333

Value: +$0

Insider	Filing Date	Transaction	Shares	Change	Price	Value
Yakob Liawatidewi	Mar 11	Grant/Award Acquisition (A) Compensation/Award	124,795	+35,450	$0.00	+$0
Rong Zhou	Mar 11	Grant/Award Acquisition (A) Compensation/Award	174,994	+39,432	$0.00	+$0
Mary Z. Luo	Mar 11	Grant/Award Acquisition (A) Compensation/Award	3,014,621	+180,504	$0.00	+$0
WILLIAM J PETERS	Mar 11	Grant/Award Acquisition (A) Compensation/Award	180,333	+58,693	$0.00	+$0

March 06, 2026

Yakob Liawatidewi

Tax Payment

Change: -1,144

Price: $19.34

Shares: 89,345

Value: -$22,124

Rong Zhou

Tax Payment

Change: -1,357

Price: $19.34

Shares: 135,562

Value: -$26,244

Mary Z. Luo

Tax Payment

Change: -7,773

Price: $19.34

Shares: 2,834,117

Value: -$150,329

WILLIAM J PETERS

Tax Payment

Change: -2,146

Price: $19.34

Shares: 121,640

Value: -$41,503

Insider	Filing Date	Transaction	Shares	Change	Price	Value
Yakob Liawatidewi	Mar 10	Tax Payment (F) Tax Payment	89,345	-1,144	$19.34	-$22,124
Rong Zhou	Mar 10	Tax Payment (F) Tax Payment	135,562	-1,357	$19.34	-$26,244
Mary Z. Luo	Mar 10	Tax Payment (F) Tax Payment	2,834,117	-7,773	$19.34	-$150,329
WILLIAM J PETERS	Mar 10	Tax Payment (F) Tax Payment	121,640	-2,146	$19.34	-$41,503

March 04, 2026

Yakob Liawatidewi

Tax Payment

Change: -965

Price: $19.96

Shares: 90,489

Value: -$19,261

Rong Zhou

Tax Payment

Change: -1,124

Price: $19.96

Shares: 136,919

Value: -$22,435

Mary Z. Luo

Tax Payment

Change: -5,769

Price: $19.96

Shares: 2,841,890

Value: -$115,149

WILLIAM J PETERS

Tax Payment

Change: -1,744

Price: $19.96

Shares: 123,786

Value: -$34,810

Insider	Filing Date	Transaction	Shares	Change	Price	Value
Yakob Liawatidewi	Mar 06	Tax Payment (F) Tax Payment	90,489	-965	$19.96	-$19,261
Rong Zhou	Mar 06	Tax Payment (F) Tax Payment	136,919	-1,124	$19.96	-$22,435
Mary Z. Luo	Mar 06	Tax Payment (F) Tax Payment	2,841,890	-5,769	$19.96	-$115,149
WILLIAM J PETERS	Mar 06	Tax Payment (F) Tax Payment	123,786	-1,744	$19.96	-$34,810