AMPH Insider Trading

Insider Trading Chart
Insider Trading History
Frequently Asked Questions
About

Insider Ownership Percentage: 27.50%

Insider Buying (Last 12 Months): $0.00

Insider Selling (Last 12 Months): $1,507,689.35

Amphastar Pharmaceuticals Insider Trading History Chart

Amphastar Pharmaceuticals Share Price & Price History

^$27.15

▼ -0.43 (-1.56%)

As of 12/4/2025 05:00 PM ET

Days: 30 | 90 | 365

Amphastar Pharmaceuticals Insider Trading History

Transaction Date	Insider Name	Title	Buy/Sell	Number of Shares	Average Share Price	Total Transaction	Shares Held After Transaction
11/25/2025	Richard K. Prins	Director	Sell	4,179	$27.10	$113,250.90	35,183
11/13/2025	Floyd F. Petersen	Director	Sell	16,679	$26.49	$441,826.71	75,531
11/3/2025	Floyd F. Petersen	Director	Sell	500	$25.27	$12,635.00	75,531
10/1/2025	Floyd F. Petersen	Director	Sell	500	$27.20	$13,600.00	76,031
8/1/2025	Floyd F. Petersen	Director	Sell	500	$20.83	$10,415.00	77,031
7/2/2025	Floyd F. Petersen	Director	Sell	500	$23.47	$11,735.00	77,531
6/2/2025	Floyd F. Petersen	Director	Sell	500	$25.67	$12,835.00	72,909
5/1/2025	Floyd F. Petersen	Director	Sell	500	$24.08	$12,040.00	73,409
4/1/2025	Floyd F. Petersen	Director	Sell	500	$28.38	$14,190.00	73,909
3/4/2025	William J. Peters	CFO	Sell	4,231	$27.54	$116,521.74	97,363
12/12/2024	Rong Zhou	EVP	Sell	7,000	$44.42	$310,940.00	118,469
12/9/2024	Richard K. Prins	Director	Sell	10,000	$43.77	$437,700.00	30,471
11/12/2024	Richard K. Prins	Director	Sell	5,000	$48.80	$244,000.00	31,471
11/12/2024	Rong Zhou	EVP	Sell	6,893	$48.88	$336,929.84	118,388
11/6/2024	William J. Peters	CFO	Sell	7,426	$52.05	$386,523.30	94,103
11/6/2024	Yakob Liawatidewi	EVP	Sell	5,214	$52.05	$271,388.70	74,938
9/5/2024	Floyd F. Petersen	Director	Sell	3,000	$46.47	$139,410.00	75,409
8/26/2024	Rong Zhou	EVP	Sell	4,000	$48.35	$193,400.00	118,388
8/12/2024	Richard K. Prins	Director	Sell	17,101	$43.07	$736,540.07	33,971
7/31/2024	William J. Peters	CFO	Sell	10,282	$44.23	$454,772.86	94,103
6/27/2024	William J. Peters	CFO	Sell	3,596	$40.93	$147,184.28	94,103
6/10/2024	Floyd F. Petersen	Director	Sell	3,000	$41.40	$124,200.00	78,409
6/3/2024	Floyd F. Petersen	Director	Sell	500	$42.65	$21,325.00	78,333
5/1/2024	Floyd F. Petersen	Director	Sell	500	$41.67	$20,835.00	78,833
4/1/2024	Floyd F. Petersen	Director	Sell	500	$43.43	$21,715.00	79,333
3/5/2024	Michael A. Zasloff	Director	Sell	12,500	$47.18	$589,750.00	21,326
3/1/2024	Floyd F. Petersen	Director	Sell	500	$45.69	$22,845.00	79,833
2/1/2024	Floyd F. Petersen	Director	Sell	500	$53.10	$26,550.00	80,333
1/10/2024	Mary Z. Luo	COO	Sell	131,386	$54.59	$7,172,361.74	1,104,416
1/8/2024	Mary Z. Luo	COO	Sell	133,644	$58.93	$7,875,640.92	1,321,958
1/2/2024	Floyd F. Petersen	Director	Sell	500	$61.37	$30,685.00	80,833
12/4/2023	Rong Zhou	EVP	Sell	3,514	$59.58	$209,364.12	112,420
12/1/2023	Floyd F. Petersen	Director	Sell	500	$57.90	$28,950.00	81,333
12/1/2023	Rong Zhou	EVP	Sell	4,316	$58.58	$252,831.28	112,420
11/17/2023	Richard K. Prins	Director	Sell	4,000	$55.86	$223,440.00	31,895
11/13/2023	Richard K. Prins	Director	Sell	5,000	$52.50	$262,500.00	35,895
11/1/2023	Floyd F. Petersen	Director	Sell	500	$45.30	$22,650.00	81,833
10/2/2023	Floyd F. Petersen	Director	Sell	500	$45.78	$22,890.00	82,333
9/6/2023	William J. Peters	CFO	Sell	60,743	$51.75	$3,143,450.25	101,360
8/28/2023	Yakob Liawatidewi	EVP	Sell	28,816	$53.13	$1,530,994.08	69,669
8/18/2023	Richard K. Prins	Director	Sell	2,000	$52.50	$105,000.00	40,895
8/15/2023	Michael A. Zasloff	Director	Sell	12,759	$57.22	$730,069.98	33,826
6/15/2023	Rong Zhou	EVP	Sell	5,000	$51.79	$258,950.00	96,888
6/15/2023	William J. Peters	CFO	Sell	36,868	$50.85	$1,874,737.80	105,603
6/13/2023	Rong Zhou	EVP	Sell	5,000	$48.24	$241,200.00	88,313
6/2/2023	William J. Peters	CFO	Sell	11,000	$46.35	$509,850.00	105,603
6/1/2023	Howard Lee	Director	Sell	16,679	$45.02	$750,888.58	142,939
5/18/2023	Rong Zhou	EVP	Sell	10,000	$44.20	$442,000.00	87,598
5/18/2023	William J. Peters	CFO	Sell	10,500	$44.35	$465,675.00	105,148
5/17/2023	Floyd F. Petersen	Director	Sell	5,000	$43.13	$215,650.00	80,117
5/15/2023	Michael A. Zasloff	Director	Sell	7,500	$42.18	$316,350.00	43,869
5/12/2023	Richard K. Prins	Director	Sell	5,000	$42.06	$210,300.00	47,342
4/17/2023	William J. Peters	CFO	Sell	5,632	$42.35	$238,515.20	105,148
4/13/2023	William J. Peters	CFO	Sell	4,868	$42.35	$206,159.80	105,148
4/13/2023	Yakob Liawatidewi	EVP	Sell	11,494	$41.56	$477,690.64	69,215
4/10/2023	William J. Peters	CFO	Sell	10,032	$40.35	$404,791.20	105,148
4/10/2023	Yakob Liawatidewi	EVP	Sell	5,000	$40.00	$200,000.00	69,215
4/3/2023	Floyd F. Petersen	Director	Sell	491	$37.72	$18,520.52	85,117
3/15/2023	William J. Peters	CFO	Sell	12,776	$36.43	$465,429.68	118,451
3/1/2023	Floyd F. Petersen	Director	Sell	500	$36.70	$18,350.00	85,608
2/1/2023	Floyd F. Petersen	Director	Sell	500	$30.35	$15,175.00	86,108

SEC Filings (Institutional Ownership Changes) for Amphastar Pharmaceuticals (NASDAQ:AMPH)

65.09% of Amphastar Pharmaceuticals stock is owned by institutions. Institutional ownership can be a sign of analyst confidence in the fundamentals of the stock.

Institutional Buying and Selling by Quarter

Amphastar Pharmaceuticals Institutional Trading History

Reporting Date	Hedge Fund	Shares Held	Market Value	% of Portfolio	Quarterly Change in Shares	Ownership in Company
12/2/2025	IFP Advisors Inc	1,369	$36K	0.0%	-32.7%	0.003%
11/19/2025	Danske Bank A S	23,043	$0.61M	0.0%	N/A	0.050%
11/17/2025	Voloridge Investment Management LLC	292,443	$7.79M	0.0%	-10.2%	0.636%
11/17/2025	Susquehanna Fundamental Investments LLC	12,568	$0.34M	0.0%	-87.6%	0.027%
11/17/2025	Quarry LP	1,183	$32K	0.0%	N/A	0.003%
11/17/2025	Qube Research & Technologies Ltd	241,212	$6.43M	0.0%	-48.6%	0.525%
11/17/2025	Millennium Management LLC	697,765	$18.60M	0.0%	+12.7%	1.518%
11/17/2025	MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.	17,242	$0.46M	0.0%	-15.2%	0.038%
11/17/2025	Lighthouse Investment Partners LLC	21,600	$0.58M	0.0%	N/A	0.047%
11/17/2025	Brevan Howard Capital Management LP	13,489	$0.36M	0.0%	-72.4%	0.029%
11/17/2025	Clark Capital Management Group Inc.	283,674	$7.56M	0.0%	N/A	0.617%
11/17/2025	Bank of America Corp DE	127,097	$3.39M	0.0%	-12.4%	0.277%
11/17/2025	Algert Global LLC	392,902	$10.47M	0.2%	+216.1%	0.855%
11/17/2025	Ameriprise Financial Inc.	129,841	$3.46M	0.0%	-23.6%	0.283%
11/14/2025	Creative Planning	55,115	$1.47M	0.0%	+29.3%	0.120%
11/14/2025	Man Group plc	32,385	$0.86M	0.0%	+59.5%	0.070%
11/14/2025	Hotchkis & Wiley Capital Management LLC	326,183	$8.69M	0.0%	-10.9%	0.710%
11/14/2025	UBS AM A Distinct Business Unit of UBS Asset Management Americas LLC	54,335	$1.45M	0.0%	-42.0%	0.118%
11/14/2025	Two Sigma Investments LP	98,678	$2.63M	0.0%	+23.1%	0.215%
11/14/2025	Bridgeway Capital Management LLC	312,337	$8.32M	0.2%	+267.0%	0.680%
11/14/2025	Vident Advisory LLC	18,431	$0.49M	0.0%	+6.7%	0.040%
11/14/2025	Squarepoint Ops LLC	49,310	$1.31M	0.0%	+114.1%	0.107%
11/13/2025	Epoch Investment Partners Inc.	1,133,986	$30.22M	0.2%	-8.7%	2.468%
11/13/2025	Marshall Wace LLP	874,068	$23.29M	0.0%	+3.0%	1.902%
11/13/2025	Advisory Research Inc.	15,468	$0.41M	0.1%	+3.8%	0.034%
11/13/2025	Arrowstreet Capital Limited Partnership	392,310	$10.46M	0.0%	+382.9%	0.854%
11/13/2025	Invesco Ltd.	389,593	$10.38M	0.0%	+0.7%	0.848%
11/13/2025	UBS Group AG	312,274	$8.32M	0.0%	+367.2%	0.680%
11/13/2025	BNP Paribas Financial Markets	222,019	$5.92M	0.0%	+209.7%	0.483%
11/13/2025	Franklin Resources Inc.	9,525	$0.25M	0.0%	N/A	0.021%
11/13/2025	Quadrant Capital Group LLC	3,076	$82K	0.0%	N/A	0.007%
11/13/2025	Legal & General Group Plc	97,614	$2.60M	0.0%	-3.5%	0.212%
11/13/2025	First Trust Advisors LP	150,422	$4.01M	0.0%	+59.5%	0.327%
11/12/2025	Dimensional Fund Advisors LP	1,755,665	$46.79M	0.0%	+7.9%	3.821%
11/12/2025	Teachers Retirement System of The State of Kentucky	10,523	$0.28M	0.0%	-10.0%	0.023%
11/12/2025	Victory Capital Management Inc.	211,800	$5.64M	0.0%	+175.6%	0.461%
11/12/2025	Royce & Associates LP	366,322	$9.76M	0.1%	+29.4%	0.797%
11/12/2025	Quantbot Technologies LP	29,763	$0.79M	0.0%	-51.2%	0.065%
11/10/2025	TD Asset Management Inc	1,931,892	$51.49M	0.0%	-5.1%	4.155%
11/10/2025	Ameritas Investment Partners Inc.	3,101	$83K	0.0%	-17.6%	0.007%
11/10/2025	China Universal Asset Management Co. Ltd.	8,150	$0.22M	0.0%	-13.9%	0.018%
11/7/2025	Vanguard Group Inc.	2,631,040	$70.12M	0.0%	-2.1%	5.659%
11/7/2025	Denali Advisors LLC	135,000	$3.60M	0.4%	N/A	0.290%
11/7/2025	PNC Financial Services Group Inc.	5,531	$0.15M	0.0%	-14.7%	0.012%
11/7/2025	Shell Asset Management Co.	1,492	$40K	0.0%	-64.2%	0.003%
11/6/2025	Assetmark Inc.	56,487	$1.51M	0.0%	+29.1%	0.121%
11/6/2025	Public Sector Pension Investment Board	139,675	$3.72M	0.0%	+11.4%	0.300%
11/6/2025	Illinois Municipal Retirement Fund	20,747	$0.55M	0.0%	+4.1%	0.045%
11/6/2025	LSV Asset Management	73,300	$1.95M	0.0%	+69.7%	0.158%
11/6/2025	Rhumbline Advisers	90,129	$2.40M	0.0%	-5.4%	0.194%
11/6/2025	Profund Advisors LLC	8,188	$0.22M	0.0%	-15.0%	0.018%
11/6/2025	ProShare Advisors LLC	8,626	$0.23M	0.0%	-14.1%	0.019%
11/5/2025	Alps Advisors Inc.	16,250	$0.43M	0.0%	N/A	0.035%
11/5/2025	Envestnet Asset Management Inc.	21,975	$0.59M	0.0%	N/A	0.047%
11/5/2025	Hantz Financial Services Inc.	3,122	$83K	0.0%	+126.7%	0.007%
11/4/2025	Illumine Investment Management LLC	27,677	$0.74M	0.5%	+2.0%	0.060%
11/4/2025	Jackson Creek Investment Advisors LLC	14,743	$0.39M	0.1%	N/A	0.032%
11/4/2025	State of Wyoming	3,301	$88K	0.0%	+21.2%	0.007%
11/4/2025	Oakworth Capital Inc.	1,874	$50K	0.0%	-68.8%	0.004%
11/4/2025	Principal Financial Group Inc.	205,678	$5.48M	0.0%	-6.1%	0.442%
11/4/2025	Thrivent Financial for Lutherans	25,828	$0.69M	0.0%	-4.5%	0.056%
11/4/2025	Significant Wealth Partners LLC	20,579	$0.55M	0.3%	+27.2%	0.044%
11/3/2025	AlphaQuest LLC	8,575	$0.23M	0.0%	-70.3%	0.018%
11/3/2025	New York State Common Retirement Fund	90,169	$2.40M	0.0%	+86.4%	0.194%
11/3/2025	SummerHaven Investment Management LLC	38,200	$1.02M	0.6%	N/A	0.082%
10/31/2025	Vanguard Personalized Indexing Management LLC	11,004	$0.29M	0.0%	-12.8%	0.024%
10/31/2025	Y Intercept Hong Kong Ltd	25,090	$0.67M	0.0%	+41.5%	0.054%
10/29/2025	Arkadios Wealth Advisors	36,008	$0.96M	0.0%	+2.4%	0.077%
10/28/2025	Campbell & CO Investment Adviser LLC	44,068	$1.17M	0.1%	+96.4%	0.095%
10/27/2025	Polaris Capital Management LLC	13,100	$0.35M	0.0%	-62.7%	0.028%
10/27/2025	Nordea Investment Management AB	153,351	$4.09M	0.0%	+0.9%	0.330%
10/24/2025	State of Alaska Department of Revenue	20,788	$0.55M	0.0%	-5.0%	0.045%
10/23/2025	CX Institutional	63,316	$1.69M	0.1%	-76.0%	0.136%
10/22/2025	Louisiana State Employees Retirement System	16,500	$0.44M	0.0%	-4.1%	0.035%
10/21/2025	Global Retirement Partners LLC	1,024	$27K	0.0%	+219.0%	0.002%
10/20/2025	VIRGINIA RETIREMENT SYSTEMS ET Al	13,562	$0.36M	0.0%	+54.8%	0.029%
10/17/2025	Boston Trust Walden Corp	1,173,107	$31.26M	0.2%	-0.3%	2.523%
10/16/2025	Rice Hall James & Associates LLC	129,339	$3.45M	0.2%	N/A	0.278%
10/15/2025	CWM LLC	1,508	$40K	0.0%	-66.5%	0.003%
10/15/2025	Pacer Advisors Inc.	5,996	$0.16M	0.0%	-98.2%	0.013%
10/14/2025	Yousif Capital Management LLC	9,273	$0.25M	0.0%	-16.3%	0.020%
10/14/2025	Farther Finance Advisors LLC	944	$25K	0.0%	+356.0%	0.002%
10/7/2025	Assenagon Asset Management S.A.	15,216	$0.41M	0.0%	-8.4%	0.033%
10/2/2025	GAMMA Investing LLC	1,223	$33K	0.0%	-43.4%	0.003%
9/24/2025	Texas Permanent School Fund Corp	54,482	$1.25M	0.0%	+5.0%	0.117%
9/4/2025	Osaic Holdings Inc.	15,236	$0.36M	0.0%	-5.6%	0.033%
8/27/2025	Squarepoint Ops LLC	23,026	$0.53M	0.0%	-67.0%	0.050%
8/26/2025	Thrivent Financial for Lutherans	27,036	$0.62M	0.0%	-1.9%	0.058%
8/19/2025	Cim LLC	11,429	$0.26M	0.0%	+15.6%	0.025%
8/19/2025	State of Wyoming	2,723	$63K	0.0%	-44.0%	0.006%
8/19/2025	Hohimer Wealth Management LLC	11,845	$0.27M	0.0%	+48.0%	0.025%
8/16/2025	Public Sector Pension Investment Board	125,363	$2.88M	0.0%	+5.4%	0.270%
8/15/2025	CANADA LIFE ASSURANCE Co	30,216	$0.69M	0.0%	-3.3%	0.065%
8/15/2025	Tower Research Capital LLC TRC	3,583	$82K	0.0%	+263.0%	0.008%
8/15/2025	Vident Advisory LLC	17,279	$0.40M	0.0%	N/A	0.037%
8/15/2025	Man Group plc	20,300	$0.47M	0.0%	-46.9%	0.044%
8/15/2025	Engineers Gate Manager LP	53,348	$1.23M	0.0%	+38.4%	0.115%
8/15/2025	BNP Paribas Financial Markets	71,689	$1.65M	0.0%	+802.3%	0.154%
8/15/2025	Bridgeway Capital Management LLC	85,112	$1.95M	0.0%	N/A	0.183%
8/15/2025	Brevan Howard Capital Management LP	48,920	$1.12M	0.0%	+469.8%	0.105%

Data available starting January 2016

Amphastar Pharmaceuticals, Inc., a bio-pharmaceutical company, develops, manufactures, markets, and sells generic and proprietary injectable, inhalation, and intranasal products in the United States, China, and France. It offers BAQSIMI, a nasal spray for the treatment of severe hypoglycemia; Primatene Mist, an over-the-counter epinephrine inhalation product for the temporary relief of mild symptoms of intermittent asthma; Enoxaparin, to prevent and treat deep vein thrombosis; REXTOVY and Naloxone for opioid overdose; Glucagon for injection emergency kit; and Cortrosyn, for use as a diagnostic agent in the screening of patients with adrenocortical insufficiency. The company provides Amphadase, an injection to absorb and disperse other injected drugs; Epinephrine injection for allergic reactions; Lidocaine jelly, an anesthetic product for urological procedures; Lidocaine topical solution for various procedures; Phytonadione injection, a vitamin K1 injection for newborn babies; emergency syringe products; morphine injection for use with patient-controlled analgesia pumps; and Lorazepam injection for surgery and medical procedures. In addition, it offers Neostigmine methylsulfate injection to treat myasthenia gravis and to reverse the effects of muscle relaxants; Isoproterenol hydrochloride injection for mild or transient episodes of heart block; Ganirelix Acetate injection for the inhibition of premature luteinizing hormone surges; Vasopressin to increase blood pressure; and Regadenoson, a stress agent for radionuclide myocardial perfusion imaging. Further, the company distributes recombinant human insulin APIs and porcine insulin API. Additionally, it develops generic product candidates, such as injectable, inhalation, and analytical technologies; biosimial product candidates; and intranasal epinephrine for the treatment of allergic reactions. The company was founded in 1996 and is headquartered in Rancho Cucamonga, California.

Today's Range

Now: $27.15

$26.97

$27.84

50 Day Range

MA: $25.63

$23.14

$27.83

52 Week Range

Now: $27.15

$20.39

$45.39

Volume

404,751 shs

Average Volume

453,124 shs

Market Capitalization

$1.25 billion

P/E Ratio

12.01

Dividend Yield

N/A

Beta

0.91

Who are the company insiders with the largest holdings of Amphastar Pharmaceuticals?: Amphastar Pharmaceuticals' top insider shareholders include:
Mary Z Luo (COO)
Rong Zhou (EVP)
William J Peters (CFO)
Floyd F Petersen (Director)
Yakob Liawatidewi (EVP)
Richard K Prins (Director)
Michael A Zasloff (Director)
Learn More about top insider investors at Amphastar Pharmaceuticals.
Who are the major institutional investors of Amphastar Pharmaceuticals?: Amphastar Pharmaceuticals' top institutional shareholders include:
Vanguard Group Inc. — 5.66%
TD Asset Management Inc — 4.16%
Dimensional Fund Advisors LP — 3.82%
Boston Trust Walden Corp — 2.52%
Epoch Investment Partners Inc. — 2.47%
Marshall Wace LLP — 1.90%
Learn More about top institutional investors of Amphastar Pharmaceuticals stock.
Which institutional investors are selling Amphastar Pharmaceuticals stock?: During the previous quarter, AMPH stock was sold by these institutional investors:
Pacer Advisors Inc.
Qube Research & Technologies Ltd
CX Institutional
Epoch Investment Partners Inc.
TD Asset Management Inc
Susquehanna Fundamental Investments LLC
Vanguard Group Inc.
Ameriprise Financial Inc.
In the last year, company insiders that have sold Amphastar Pharmaceuticals company stock include:
Mary Z Luo (COO)
Rong Zhou (EVP)
William J Peters (CFO)
Floyd F Petersen (Director)
Learn More investors selling Amphastar Pharmaceuticals stock.
Which institutional investors are buying Amphastar Pharmaceuticals stock?: During the last quarter, AMPH stock was bought by institutional investors including:
Arrowstreet Capital Limited Partnership
Clark Capital Management Group Inc.
Algert Global LLC
UBS Group AG
Bridgeway Capital Management LLC
BNP Paribas Financial Markets
Denali Advisors LLC
Victory Capital Management Inc.