United States Pharmaceuticals

Amphastar Pharmaceuticals Inc (AMPH)

Track

Amphastar Pharmaceuticals recently witnessed two proposed sales by insiders totaling approximately $345,818. These transactions occurred shortly after the company's August 2026 earnings report, which featured a positive surprise. The stock has experienced a 10.9% price increase over the past quarter, reflecting ongoing market activity following these executive divestments.
Ticker: AMPH Exchange: NSM
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• Purchase • Sale • Planned purchase • Planned sale Net purchase Net sale Buy signal Sell signal Earnings
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Proposed sale 11 Aug 2026
Value US$2,396,510.38 | Price 356.11 | Shares 32,738
Abbreviations B: Buy, S: Sell, PP: Planned purchase, PlS: Planned sale, PrS: Proposed sale, O: Option / Other
Notification date Transaction date B/S Transaction type Insider and/or position Nb. shares
Price
Value 		Number of shares Price Value Details
2026-08-11 2026-08-11 PrS Proposed sale
3.0
Richard Prins

Director

Non-Executive Director
32,738
356.11
US$2,396,510 		32,738 356.11 US$2,396,510
2026-08-11 2026-08-07 PlS Planned sale
2.2
PETERS WILLIAM J

CFO, EVP & TREASURER

Executive Director
57,859 -44.8%
215.60
US$638,592 		57,859 -44.8% 215.60 US$638,592
2026-08-07 2026-08-07 PrS Proposed sale
2.2
PETERS WILLIAM J

Officer

Officer
28,205
476.54
US$2,750,091 		28,205 476.54 US$2,750,091
2025-12-18 2025-12-17 S Sale
3.5
Zhou Rong

SENIOR EVP, PRODUCTION CENTER

Officer
9,787 -6.6%
26.20
US$256,379 		9,787 -6.6% 26.20 US$256,379
2025-12-15 2025-12-12 S Sale
2.8
Petersen Floyd F.
Non-Executive Director
2,426 -3.3%
25.92
US$62,888 		2,426 -3.3% 25.92 US$62,888
2025-12-15 2025-12-11 S Sale
2.8
Petersen Floyd F.
Non-Executive Director
1,737 -2.3%
25.69
US$44,620 		1,737 -2.3% 25.69 US$44,620
2025-12-11 2025-12-11 PrS Proposed sale
2.8
Floyd Petersen

Director

Non-Executive Director
4,163
80.00
US$333,040 		4,163 80.00 US$333,040
2025-12-10 2025-12-10 PrS Proposed sale
2.8
Floyd Petersen

Director

Non-Executive Director
1,737
25.00
US$43,425 		1,737 25.00 US$43,425
2025-11-28 2025-11-28 PrS Proposed sale
3.5
Rong Zhou

Officer

Officer
20,000
25.00
US$500,000 		20,000 25.00 US$500,000
2025-11-25 2025-11-25 PrS Proposed sale
3.0
Richard Prins

Director

Non-Executive Director
4,179
25.00
US$104,475 		4,179 25.00 US$104,475
2025-11-25 2025-11-25 S Sale
3.0
PRINS RICHARD K
Non-Executive Director
4,179 -10.6%
27.10
US$113,253 		4,179 -10.6% 27.10 US$113,253
2025-11-17 2025-11-13 S Sale
2.8
Petersen Floyd F.
Non-Executive Director
16,679 -18.1%
26.49
US$441,837 		16,679 -18.1% 26.49 US$441,837
2025-11-13 2025-11-13 PrS Proposed sale
2.8
Floyd Petersen

Director

Non-Executive Director
16,679
26.49
US$441,837 		16,679 26.49 US$441,837
2025-11-05 2025-11-03 PlS Planned sale
2.8
Petersen Floyd F.
Non-Executive Director
500 -0.7%
25.27
US$12,633 		500 -0.7% 25.27 US$12,633
2025-11-03 2025-11-03 PrS Proposed sale
2.8
Petersen Floyd F.

Director

Non-Executive Director
500
25.30
US$12,650 		500 25.30 US$12,650
2025-10-02 2025-10-01 PlS Planned sale
2.8
Petersen Floyd F.
Non-Executive Director
500 -0.7%
27.20
US$13,602 		500 -0.7% 27.20 US$13,602
2025-10-01 2025-10-01 PrS Proposed sale
2.8
Petersen Floyd F.

Director

Non-Executive Director
500
26.74
US$13,370 		500 26.74 US$13,370
2025-09-03 2025-09-02 PlS Planned sale
2.8
Petersen Floyd F.
Non-Executive Director
500 -0.6%
30.98
US$15,492 		500 -0.6% 30.98 US$15,492
2025-09-02 2025-09-02 PrS Proposed sale
2.8
Petersen Floyd F.

Director

Non-Executive Director
500
30.90
US$15,450 		500 30.90 US$15,450
2025-08-04 2025-08-01 PlS Planned sale
2.8
Petersen Floyd F.
Non-Executive Director
500 -0.6%
20.83
US$10,416 		500 -0.6% 20.83 US$10,416
2025-08-01 2025-08-01 PrS Proposed sale
2.8
Petersen Floyd F.

Director

Non-Executive Director
500
20.86
US$10,430 		500 20.86 US$10,430
2025-07-03 2025-07-02 PlS Planned sale
2.8
Petersen Floyd F.
Non-Executive Director
500 -0.6%
23.47
US$11,734 		500 -0.6% 23.47 US$11,734
2025-07-02 2025-07-02 PrS Proposed sale
2.8
Petersen Floyd F.

Director

Non-Executive Director
500
23.43
US$11,715 		500 23.43 US$11,715
2025-06-04 2025-06-02 PlS Planned sale
2.8
Petersen Floyd F.
Non-Executive Director
500 -0.7%
25.67
US$12,835 		500 -0.7% 25.67 US$12,835
2025-06-02 2025-06-02 PrS Proposed sale
2.8
Petersen Floyd F.

Director

Non-Executive Director
500
25.61
US$12,805 		500 25.61 US$12,805
2025-05-02 2025-05-01 PlS Planned sale
2.8
Petersen Floyd F.
Non-Executive Director
500 -0.7%
24.08
US$12,041 		500 -0.7% 24.08 US$12,041
2025-05-01 2025-05-01 PrS Proposed sale
2.8
Petersen Floyd F.

Director

Non-Executive Director
500
24.19
US$12,095 		500 24.19 US$12,095
2025-04-02 2025-04-01 PlS Planned sale
2.8
Petersen Floyd F.
Non-Executive Director
500 -0.7%
28.38
US$14,190 		500 -0.7% 28.38 US$14,190
2025-04-01 2025-04-01 PrS Proposed sale
2.8
Petersen Floyd F.

Director

Non-Executive Director
500
28.86
US$14,430 		500 28.86 US$14,430
2025-03-07 2025-03-06 PlS Planned sale
2.8
Petersen Floyd F.
Non-Executive Director
1,000 -1.3%
27.99
US$27,986 		1,000 -1.3% 27.99 US$27,986
2025-03-06 2025-03-06 PrS Proposed sale
2.8
Petersen Floyd F.

Director

Non-Executive Director
1,000
27.80
US$27,800 		1,000 27.80 US$27,800
2025-03-06 2025-03-04 PlS Planned sale
2.2
PETERS WILLIAM J

CFO, EVP & TREASURER

Executive Director
4,231 -4.2%
27.54
US$116,515 		4,231 -4.2% 27.54 US$116,515
2025-03-04 2025-03-04 PrS Proposed sale
2.2
PETERS WILLIAM J

Officer

Officer
4,231
27.21
US$115,126 		4,231 27.21 US$115,126
2024-12-16 2024-12-13 S Sale
3.5
Zhou Rong

SENIOR EVP, PRODUCTION CENTER

Officer
8,000 -6.3%
45.23
US$361,840 		8,000 -6.3% 45.23 US$361,840
2024-12-16 2024-12-12 S Sale
3.5
Zhou Rong

SENIOR EVP, PRODUCTION CENTER

Officer
7,000 -5.6%
44.43
US$310,975 		7,000 -5.6% 44.43 US$310,975
2024-12-11 2024-12-09 S Sale
3.0
PRINS RICHARD K
Non-Executive Director
10,000 -24.7%
43.77
US$437,702 		10,000 -24.7% 43.77 US$437,702
2024-12-09 2024-12-09 PrS Proposed sale
3.0
Richard Prins

Executive
10,000
44.00
US$440,000 		10,000 44.00 US$440,000
2024-11-13 2024-11-12 S Sale
3.5
Zhou Rong

SENIOR EVP, PRODUCTION CENTER

Officer
6,893 -5.5%
48.88
US$336,930 		6,893 -5.5% 48.88 US$336,930
2024-11-13 2024-11-12 S Sale
3.0
PRINS RICHARD K
Non-Executive Director
5,000 -13.7%
48.80
US$243,986 		5,000 -13.7% 48.80 US$243,986
2024-11-12 2024-11-12 PrS Proposed sale
3.5
Rong Zhou

Executive Vice President
31,680
48.10
US$1,523,808 		31,680 48.10 US$1,523,808
2024-11-12 2024-11-12 PrS Proposed sale
3.0
Richard Prins

Director

Non-Executive Director
5,000
48.10
US$240,500 		5,000 48.10 US$240,500
2024-11-08 2024-11-06 PlS Planned sale
2.7
Liawatidewi Yakob

EVP CORP ADMIN CENTER

Executive Director
5,214 -6.5%
52.05
US$271,389 		5,214 -6.5% 52.05 US$271,389
2024-11-08 2024-11-06 PlS Planned sale
2.2
PETERS WILLIAM J

CFO, EVP & TREASURER

Executive Director
7,426 -7.3%
52.05
US$386,523 		7,426 -7.3% 52.05 US$386,523
2024-11-06 2024-11-06 PrS Proposed sale
2.7
Liawatidewi Yakob

Director

Non-Executive Director
5,214
52.05
US$271,389 		5,214 52.05 US$271,389
2024-11-06 2024-11-06 PrS Proposed sale
2.2
PETERS WILLIAM J

Officer

Officer
7,426
52.05
US$386,523 		7,426 52.05 US$386,523
2024-09-17 2024-09-13 S Sale
3.5
Zhou Rong

SENIOR EVP, PRODUCTION CENTER

Officer
3,000 -2.5%
48.26
US$144,784 		3,000 -2.5% 48.26 US$144,784
2024-09-06 2024-09-05 S Sale
2.8
Petersen Floyd F.
Non-Executive Director
3,000 -3.8%
46.47
US$139,417 		3,000 -3.8% 46.47 US$139,417
2024-09-05 2024-09-05 PrS Proposed sale
2.8
Floyd Petersen

Director

Non-Executive Director
5,000
46.00
US$230,000 		5,000 46.00 US$230,000
2024-08-27 2024-08-26 S Sale
3.5
Zhou Rong

SENIOR EVP, PRODUCTION CENTER

Officer
4,000 -3.3%
48.35
US$193,400 		4,000 -3.3% 48.35 US$193,400
2024-08-26 2024-08-26 PrS Proposed sale
3.5
Rong Zhou

Director

Non-Executive Director
13,893
47.00
US$652,971 		13,893 47.00 US$652,971
2024-08-13 2024-08-12 S Sale
3.0
PRINS RICHARD K
Non-Executive Director
17,101 -33.5%
43.07
US$736,550 		17,101 -33.5% 43.07 US$736,550
2024-08-12 2024-08-12 PrS Proposed sale
3.0
Richard Prins

Director

Non-Executive Director
17,101
44.00
US$752,444 		17,101 44.00 US$752,444
2024-08-02 2024-07-31 PlS Planned sale
2.2
PETERS WILLIAM J

CFO, EVP & TREASURER

Executive Director
10,282 -9.9%
44.23
US$454,773 		10,282 -9.9% 44.23 US$454,773
2024-07-31 2024-07-31 PrS Proposed sale
2.2
PETERS WILLIAM J

Officer

Officer
10,282
44.23
US$454,772 		10,282 44.23 US$454,772
2024-06-28 2024-06-27 PlS Planned sale
2.2
PETERS WILLIAM J

CFO, EVP & TREASURER

Executive Director
635 -0.7%
41.29
US$26,222 		635 -0.7% 41.29 US$26,222
2024-06-28 2024-06-27 PlS Planned sale
2.2
PETERS WILLIAM J

CFO, EVP & TREASURER

Executive Director
2,961 -3.0%
40.85
US$120,947 		2,961 -3.0% 40.85 US$120,947
2024-06-27 2024-06-27 PrS Proposed sale
2.2
PETERS WILLIAM J

Officer

Officer
3,596
40.20
US$144,559 		3,596 40.20 US$144,559
2024-06-11 2024-06-10 S Sale
2.8
Petersen Floyd F.
Non-Executive Director
3,000 -3.7%
41.40
US$124,200 		3,000 -3.7% 41.40 US$124,200
2024-06-10 2024-06-10 PrS Proposed sale
2.8
Floyd Petersen

Director

Non-Executive Director
3,000
40.00
US$120,000 		3,000 40.00 US$120,000
2024-06-05 2024-06-03 PlS Planned sale
2.8
Petersen Floyd F.
Non-Executive Director
500 -0.6%
42.65
US$21,326 		500 -0.6% 42.65 US$21,326
2024-06-03 2024-06-03 PrS Proposed sale
2.8
Petersen Floyd F.

Director

Non-Executive Director
500
42.33
US$21,165 		500 42.33 US$21,165
2024-05-02 2024-05-01 PlS Planned sale
2.8
Petersen Floyd F.
Non-Executive Director
500 -0.6%
41.67
US$20,837 		500 -0.6% 41.67 US$20,837
2024-05-02 2024-05-01 PlS Planned sale
2.8
Petersen Floyd F.
Non-Executive Director
500 -0.6%
41.67
US$20,837 		500 -0.6% 41.67 US$20,837
2024-05-01 2024-05-01 PrS Proposed sale
2.8
Petersen Floyd F.

Director

Non-Executive Director
500
41.41
US$20,705 		500 41.41 US$20,705
2024-04-02 2024-04-01 PlS Planned sale
2.8
Petersen Floyd F.
Non-Executive Director
500 -0.6%
43.43
US$21,714 		500 -0.6% 43.43 US$21,714
2024-04-01 2024-04-01 PrS Proposed sale
2.8
Petersen Floyd F.

Director

Non-Executive Director
500
43.97
US$21,985 		500 43.97 US$21,985
2024-03-08 2024-03-06 PlS Planned sale
2.2
PETERS WILLIAM J

CFO, EVP & TREASURER

Executive Director
51 -0.0%
48.00
US$2,448 		51 -0.0% 48.00 US$2,448
2024-03-08 2024-03-06 PlS Planned sale
2.2
PETERS WILLIAM J

CFO, EVP & TREASURER

Executive Director
4,681 -4.0%
46.98
US$219,896 		4,681 -4.0% 46.98 US$219,896
2024-03-08 2024-03-06 PlS Planned sale
2.2
PETERS WILLIAM J

CFO, EVP & TREASURER

Executive Director
13,404 -10.3%
46.30
US$620,540 		13,404 -10.3% 46.30 US$620,540
2024-03-06 2024-03-06 PrS Proposed sale
2.2
PETERS WILLIAM J

Officer

Officer
18,136
48.00
US$870,528 		18,136 48.00 US$870,528
2024-03-06 2024-03-05 S Sale
3.0
ZASLOFF MICHAEL A
Non-Executive Director
3,111 -12.7%
47.53
US$147,853 		3,111 -12.7% 47.53 US$147,853
2024-03-06 2024-03-05 S Sale
3.0
ZASLOFF MICHAEL A
Non-Executive Director
9,389 -27.8%
47.06
US$441,871 		9,389 -27.8% 47.06 US$441,871
2024-03-05 2024-03-05 PrS Proposed sale
3.0
Michael Zasloff

Director

Non-Executive Director
12,500
46.00
US$575,000 		12,500 46.00 US$575,000
2024-03-04 2024-03-01 PlS Planned sale
2.8
Petersen Floyd F.
Non-Executive Director
49 -0.1%
46.53
US$2,280 		49 -0.1% 46.53 US$2,280
2024-03-04 2024-03-01 PlS Planned sale
2.8
Petersen Floyd F.
Non-Executive Director
451 -0.6%
45.60
US$20,567 		451 -0.6% 45.60 US$20,567
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