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Amphastar Pharmaceuticals, Inc.

AMPH
Exchange
Nasdaq
Industry
Pharmaceutical Preparations
SEC CIK
0001297184

In the last 90 days, Amphastar Pharmaceuticals, Inc. insiders filed 0 open-market purchases and 5 sales; 212 institutions reported holding it in 13F filings for Q2 2026, worth $572.1M in total; no superinvestor holds it.

Open-market trades, last 90 days

Open-market purchases (P) and sales (S) by Amphastar Pharmaceuticals, Inc. insiders, counted by Form 4 filing. Trades with a flagged price and duplicate filings are left out.

Open-market buys
0 filings
Open-market sells
5 filings
3 insiders, $763.9K in total
Insiders trading
3
Net value
−$763.9K
Purchases minus sales

Insider roster

Directors, officers and 10% owners who have filed a Form 4 for Amphastar Pharmaceuticals, Inc., current and former, most recent filer first. Last reported holding is the position after the last non-derivative trade in their latest filing.

Insider roster for Amphastar Pharmaceuticals, Inc.
NameTitleLast reported holdingLast filingFilings, past year
Peters William JCFO, EVP & TREASURER168,707Sep 23, 20266
Zhou RongSENIOR EVP, PRODUCTION CENTER169,203Sep 17, 20267
Prins Richard KDirector29,625Aug 12, 20263
Pierce Anthony TDirector7,886Jul 13, 20261
Zasloff Michael ADirector37,667Jun 3, 20261
Lee HowardDirector159,350Jun 3, 20261
Gerst Diane G.Director31,899Jun 3, 20261
Deflin GayleDirector19,057Jun 3, 20261
Gaugh David RussellDirector14,447Jun 3, 20261
Luo Mary Z.COO, Chief Scientist, Chairman1,245,125IndirectMar 17, 20264
Zhang Jack Y.CEO & CHIEF SCIENTIFIC OFFICER1,245,125IndirectMar 17, 20264
Liawatidewi YakobEVP CORP ADMIN CENTER121,892Mar 17, 20264
Petersen Floyd F.Director71,368Dec 15, 20254

Insider trades

Each row adds up one type of transaction in one Form 4 filing. Only open-market purchases (P) and sales (S) are shown by default; use the filters to see grants, option exercises and other codes.

Insider trades
Filed (ET)Trade dateFiling delayInsiderTransactionSharesAvg priceValueHolding changeFlags
Jul 8, 2021 (view filing)Jul 71 dayPeters William JCFO, EVP & TreasurerSSale−10.0K$20.37−$203.7K−8.2%112.3K after
Jul 16, 2021 (view filing)Jul 151 dayLiawatidewi YakobEVP Corp Admin CenterSSale−31.5K$20.01−$630.8K−36.8%54.1K after
Jul 22, 2021 (view filing)Jul 202 daysZhou RongEVP, Production CenterSSale−5.19K$20.57−$106.7K−5.7%86.2K after
Jul 27, 2021 (view filing)Jul 261 dayZhou RongEVP, Production CenterSSale−6.00K$20.87−$125.2K−6.5%86.2K after
Aug 3, 2021 (view filing)Aug 21 dayLiawatidewi YakobEVP Corp Admin CenterSSale−8.93K$21.14−$188.8K−14.2%54.1K after
Aug 4, 2021 (view filing)Aug 22 daysZhou RongEVP, Production CenterSSale−9.12K$21.24−$193.8K−9.9%83.1K after
Aug 17, 2021 (view filing)Aug 161 dayPeters William JCFO, EVP & TreasurerSSale−6.59K$19.35−$127.5K−5.9%105.7K after
Nov 12, 2021 (view filing)Nov 111 dayPeters William JCFO, EVP & TreasurerSSale−10.0K$21.33−$213.3K−8.6%105.7K after
Nov 12, 2021 (view filing)Nov 111 dayZhou RongEVP, Production CenterSSale−7.81K$21.67−$169.3K−8.6%83.1K after
Nov 23, 2021 (view filing)Nov 221 dayPrins Richard KDirectorSSale−5.00K$21.22−$106.1K−10.0%45.2K after
Dec 13, 2021 (view filing)Dec 103 daysPrins Richard KDirectorSSale−5.29K$21.36−$113.0K−10.5%45.2K after
Dec 17, 2021 (view filing)Dec 161 dayPeters William JCFO, EVP & TreasurerSSale−1.74K$22.40−$39.1K−1.6%106.0K after
Dec 22, 2021 (view filing)Dec 211 dayPeters William JCFO, EVP & TreasurerSSale−8.26K$22.40−$184.9K−7.2%106.0K after
Dec 23, 2021 (view filing)Dec 221 dayPetersen Floyd F.DirectorSSale−1.00K$22.50−$22.5K−1.3%78.4K after
Jan 4, 2022 (view filing)Dec 30, 20215 daysPeters William JCFO, EVP & TreasurerSSale−10.0K$23.40−$234.0K−8.6%106.0K after
Jan 4, 2022 (view filing)Jan 31 dayPetersen Floyd F.DirectorSSale−500$23.22−$11.6K−0.6%77.9K after
Jan 11, 2022 (view filing)Jan 7-104 daysPeters William JCFO, EVP & TreasurerSSale−47.8K$24.75−$1.18M−31.1%106.0K after3 lots
Jan 11, 2022 (view filing)Jan 101 dayZhou RongEVP, Production CenterSSale−20.9K$25.36−$530.7K−21.5%76.6K after2 lots
Feb 2, 2022 (view filing)Feb 11 dayPetersen Floyd F.DirectorSSale−500$24.09−$12.0K−0.6%77.4K after2 lots
Feb 9, 2022 (view filing)Feb 81 dayPeters William JCFO, EVP & TreasurerSSale−10.0K$26.95−$269.5K−8.6%106.0K after
Feb 9, 2022 (view filing)Feb 81 dayZhou RongEVP, Production CenterSSale−7.00K$26.77−$187.4K−8.4%76.6K after
Mar 1, 2022 (view filing)Feb 254 daysPeters William JCFO, EVP & TreasurerSSale−23.0K$28.47−$654.9K−17.8%106.0K after2 lots
Mar 1, 2022 (view filing)Feb 254 daysZhou RongEVP, Production CenterSSale−13.2K$28.77−$381.1K−15.9%70.3K after
Mar 1, 2022 (view filing)Mar 1Same dayPetersen Floyd F.DirectorSSale−500$27.27−$13.6K−0.6%76.9K after
Mar 9, 2022 (view filing)Mar 72 daysPeters William JCFO, EVP & TreasurerSSale−13.0K$29.35−$382.3K−10.9%106.0K after
Mar 17, 2022 (view filing)Mar 161 dayZasloff Michael ADirectorSSale−10.0K$33.71−$337.1K−17.5%47.2K after
Mar 17, 2022 (view filing)Mar 152 daysPeters William JCFO, EVP & TreasurerSSale−7.90K$34.46−$272.2K−7.4%98.1K after
Mar 17, 2022 (view filing)Mar 152 daysPrins Richard KDirectorSSale−10.0K$34.02−$340.2K−18.1%45.2K after
Mar 18, 2022 (view filing)Mar 162 daysPeters William JCFO, EVP & TreasurerSSale−50.8K$33.96−$1.72M−30.8%114.1K after2 lots
Apr 4, 2022 (view filing)Apr 13 daysPetersen Floyd F.DirectorSSale−500$36.69−$18.3K−0.7%76.4K after2 lots
May 3, 2022 (view filing)May 21 dayPetersen Floyd F.DirectorSSale−295$35.18−$10.4K−0.4%76.1K after2 lots
May 17, 2022 (view filing)May 161 dayZasloff Michael ADirectorSSale−10.3K$35.61−$366.5K−17.9%47.2K after
May 18, 2022 (view filing)4:06 PM ETMay 16-172 daysLuo Mary Z. and 1 otherCEO & Chief Scientific OfficerSSale−118.4K$35.75−$4.23M−5.1%2.22M after4 lots
May 19, 2022 (view filing)May 181 dayPetersen Floyd F.DirectorSSale−9.92K$35.05−$347.8K−10.3%86.4K after
May 20, 2022 (view filing)4:38 PM ETMay 18-192 daysLuo Mary Z. and 1 otherCEO & Chief Scientific OfficerSSale−108.8K$34.00−$3.70M−4.9%2.11M after5 lots
May 23, 2022 (view filing)4:05 PM ETMay 203 daysLuo Mary Z. and 1 otherCEO & Chief Scientific OfficerSSale−10.7K$34.21−$364.4K−0.5%2.10M after
May 25, 2022 (view filing)May 232 daysLee HowardDirectorSSale−10.0K$34.93−$349.3K−6.7%138.8K after
Jun 2, 2022 (view filing)Jun 11 dayPetersen Floyd F.DirectorSSale−500$37.00−$18.5K−0.6%85.9K after2 lots
Jun 7, 2022 (view filing)Jun 61 dayLee HowardDirectorSSale−10.3K$37.79−$388.9K−6.9%138.8K after
Jun 22, 2022 (view filing)Jun 175 daysPeters William JCFO, EVP & TreasurerSSale−5.51K$32.05−$176.7K−5.2%100.5K after
Jul 1, 2022 (view filing)Jun 301 dayPeters William JCFO, EVP & TreasurerSSale−18.4K$34.95−$642.6K−15.5%100.5K after
Jul 5, 2022 (view filing)Jun 305 daysGerst Diane G.DirectorSSale−5.15K$35.00−$180.1K−28.6%12.8K after
Jul 5, 2022 (view filing)Jul 14 daysPetersen Floyd F.DirectorSSale−500$34.78−$17.4K−0.6%89.6K after
Jul 6, 2022 (view filing)Jul 51 dayGerst Diane G.DirectorSSale−1.81K$35.00−$63.5K−12.4%12.8K after
Jul 12, 2022 (view filing)Jul 111 dayGerst Diane G.DirectorSSale−1.52K$36.26−$55.2K−10.6%12.8K after
Jul 18, 2022 (view filing)Jul 153 daysLiawatidewi YakobEVP Corp Admin CenterSSale−10.8K$36.64−$397.1K−15.0%61.6K after2 lots
Jul 19, 2022 (view filing)Jul 181 dayGerst Diane G.DirectorSSale−1.52K$37.23−$56.6K−10.6%12.8K after
Aug 2, 2022 (view filing)Aug 11 dayPetersen Floyd F.DirectorSSale−500$37.48−$18.7K−0.6%89.1K after
Aug 10, 2022 (view filing)Aug 8-92 daysLiawatidewi YakobEVP Corp Admin CenterSSale−8.05K$38.38−$309.1K−11.6%61.6K after2 lots
Aug 10, 2022 (view filing)Aug 91 dayPeters William JCFO, EVP & TreasurerSSale−10.0K$38.35−$383.5K−9.1%100.5K after