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AMPH · Amphastar Pharmaceuticals, Inc.
> Ask across nine datasets ⌘K
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TEAM-0.32% 13F +439META+3.01% 13F +2,694RCG-2.04% CLUSTERUTHR-4.03% 13F +425CRWV+4.49% 13F +693CRM+2.92% 13F +1,018CVNA-0.98% 13F +794TPL-0.71% 13F +444NET+4.32% 13F +710MSTR+17.56% 13F +526DELL+4.91% 13F +1,203CRWD+5.68% 13F +1,382ANET+1.22% 13F +1,323COIN+10.14% 13F +475TEAM-0.32% 13F +439META+3.01% 13F +2,694RCG-2.04% CLUSTERUTHR-4.03% 13F +425CRWV+4.49% 13F +693CRM+2.92% 13F +1,018CVNA-0.98% 13F +794TPL-0.71% 13F +444NET+4.32% 13F +710MSTR+17.56% 13F +526DELL+4.91% 13F +1,203CRWD+5.68% 13F +1,382ANET+1.22% 13F +1,323COIN+10.14% 13F +475
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AMPH

Amphastar Pharmaceuticals, Inc.
PHARMA & BIOTECH · PHARMACEUTICAL PREPARATIONS · CIK 0001297184
FORM 144 · 4☆ WATCH
INSIDER NET · 180D
-$421.0K
open-market buys minus sells, Form 4 codes P and S
INSIDER BUYERS · 180D
0
CONGRESS BUYERS · 1Y
0
FUNDS ADDED · QTR
101
13F, latest reported quarter
REVENUE GROWTH
-1.7%
XBRL, annual
NET MARGIN
13.6%
CONVERSIONS · 180D
1
codes C/M, not in net · $100.0K priced
SEVEN FACTS, RANKED AGAINST THE SECTOR · RANK IS NOT A FORECAST
INSIDERS
net -$421.0K over 180 days
-$421.0K over 90 days
below 55% of Pharma & Biotech
CONGRESS
no member of Congress has reported trading it
FUNDS
101 funds added or opened last quarter
more than 65% of Pharma & Biotech
REVENUE
-1.7% year over year
below 60% of Pharma & Biotech
MARGIN
13.6% net margin
more than 84% of Pharma & Biotech
BUYBACKS
$74.7M repurchased, FY to 2026-06-30
more than 63% of Pharma & Biotech
SHORT
11.6% of shares outstanding short · 11.9 days to cover · settled 2026-07-31
more than 82% of Pharma & Biotech
THE SITUATION · EVERY LINE IS ONE RULE OVER ONE DATASET
Insiders are net sellers: -$421.0K across 3 people in 180 days.
101 funds added or opened positions in the latest 13F quarter, of 216 holders.
The year, with the filings on it
Total return indexed to 100 over the last 12 months · every marker is a federal filing, placed at its date — hover any marker for the detail
TOTAL 12M RETURN -24.8%
-24.8%12M
-45%-30%-15%+0%2025-092025-102025-122026-032026-052026-072026-09 2025-11-13 · Petersen Floyd F. sold $441.8K2025-12-17 · Zhou Rong sold $256.4K2026-08-07 · PETERS WILLIAM J sold $183.9K2026-08-11 · PRINS RICHARD K sold $161.9K2025-11-25 · PRINS RICHARD K sold $113.3K2026-09-02 · Zhou Rong sold $75.3K2025-12-12 · Petersen Floyd F. sold $62.9K2025-12-11 · Petersen Floyd F. sold $44.6K2025-09-02 · Petersen Floyd F. sold $15.5K2025-10-01 · Petersen Floyd F. sold $13.6K2025-11-03 · Petersen Floyd F. sold $12.6K2026-09-01 · Rong Zhou filed to sell $290.1K2026-08-18 · Floyd Petersen filed to sell $989.1K2026-08-11 · Richard Prins filed to sell $161.9K2026-08-07 · PETERS WILLIAM J filed to sell $183.9K
INSIDER SELLFORM 144
INDEXED RETURN, DIVIDEND-ADJUSTED — NOT A PRICE CHART · LARGE TRADES DRAWN FIRST WHEN A NAME FILES HEAVILY
Live price
Daily candles from TradingView, on their licence — no filings are marked on this one
WHY THIS NAME IS ON THE DESK
Insiders have filed to sell — before selling.
The record shows a net $421.0K sold by insiders over 180 days, 101 funds added last quarter, $1.6M in planned Form 144 sales. Every figure is a federal filing, dated the day it became public.
Backtest this pattern Open the screener
Same sector, ranked by filing activity
Sector from the SEC's own SIC classification
UTHRCPIXMRNAREGNLLYALNYELFCITRMDGLDNAVRTXNUVL
Insider transactions
Form 4 purchases and sales (codes P and S) — grants, option exercises and preferred conversions excluded

Over the last 180 days, Amphastar Pharmaceuticals, Inc. insiders sold a net $421.0K of stock across 180 Form 4 purchases and sales, with 0 insider(s) buying. Source: SEC Form 4 filings, as of 2026-09-05.

INSIDER
FILED
SHARES
VALUE
Zhou Rong
SENIOR EVP, PRODUCTION CENTER
SELL
2026-09-02
3,187.0
$75.3K
PRINS RICHARD K
Director
SELL
2026-08-11
7,973.0
$161.9K
PETERS WILLIAM J
CFO, EVP & TREASURER
SELL
2026-08-07
8,180.0
$183.9K
Zhou Rong
SENIOR EVP, PRODUCTION CENTER
SELL
2025-12-17
9,787.0
$256.4K
Petersen Floyd F.
Director
SELL
2025-12-12
2,426.0
$62.9K
180 TRANSACTIONS ON RECORD

Showing the most recent few. Create a free account to see 175 more transactions on record, the cross-source screener and CSV export. We store only your email address, and there is no password to create.

Institutional holders
13F · holdings as of the latest quarter funds have reported
BlackRock, Inc.
5,224,934.0 sh
$105.4M
DIMENSIONAL FUND ADVISORS LP
2,305,107.0 sh
$46.5M
STATE STREET CORP
1,642,126.0 sh
$33.1M
VANGUARD CAPITAL MANAGEMENT LLC
1,481,952.0 sh
$29.9M
AMERICAN CENTURY COMPANIES INC
1,176,626.0 sh
$23.7M
SCHEDULE 13D/G
No 5%+ ownership filings
Nobody has crossed 5% with a filing obligation. Absence is a fact here, not missing data.
Planned sales · Form 144
Filed before the sale — intent, not a trade
Rong Zhou
FILED 2026-09-01
$290.1K
Floyd Petersen
FILED 2026-08-18
$989.1K
Richard Prins
FILED 2026-08-11
$161.9K
PETERS WILLIAM J
FILED 2026-08-07
$183.9K
Fund concentration
N-PORT · funds ranked by how much of THEMSELVES they put in this stock — the conviction number 13F cannot show
Miller Intermediate Bond Fund
$4.1M POSITION · AS OF 2026-04-30
2.4%
Invesco Pharmaceuticals ETF
$7.8M POSITION · AS OF 2026-04-30
2.3%
State Street(R) SPDR(R) S&P(R) Pharmaceuticals ETF
$4.5M POSITION · AS OF 2026-03-31
1.4%
PROFUND VP PHARMACEUTICALS
$141.5K POSITION · AS OF 2026-03-31
1.4%
Advent Convertible Bond ETF
$346.4K POSITION · AS OF 2026-02-28
1.2%
Direxion Daily Pharmaceutical & Medical Bull 3X Shares
$146.1K POSITION · AS OF 2026-04-30
1.1%
SEC N-PORT, MONTHLY WITH A ~60-DAY PUBLIC LAG · FUNDS ≥ $10M · % = SHARE OF THE FUND'S OWN BOOK
Clinical pipeline
ClinicalTrials.gov · 2 registered trials, 0 still enrolling or running — a status change here is dated weeks before the press release
2
Multi-phase
0 ACTIVE
TRIALS MATCHED TO THIS TICKER BY SPONSOR NAME · STUDIES RUN UNDER A SUBSIDIARY'S OWN NAME ARE NOT INCLUDED
Executive pay vs shareholder return
DEF 14A pay-versus-performance disclosure · both the headline pay and the SEC's mark-to-market figure, beside the return the company delivered and the return of the peer group it chose itself
FY
CEO TOTAL
ACTUALLY PAID
OTHER NEOs AVG
TSR
PEER TSR
2025
$8.3M
$2.4M
$3.0M
+33%
+25%
2024
$7.7M
-$7.6M
$2.7M
+85%
-7%
2023
$7.7M
$28.9M
$2.6M
+208%
-6%
2022
$7.5M
$12.9M
$2.5M
+39%
-10%
2021
$6.5M
$8.8M
$2.2M
+16%
+0%
TAGGED BY THE COMPANY UNDER SEC ITEM 402(v) · RETURN IS CUMULATIVE FROM THE START OF THE DISCLOSURE PERIOD · GREEN WHERE THE COMPANY BEAT ITS OWN PEER GROUP
Fundamentals
Annual figures from XBRL filings · pick a past date to see them exactly as the market knew them then — restatements and all
2025-122024-122023-122022-12
REVENUE$719.9M$732.0M$644.4M$499.0M
GROSS PROFIT$356.1M$373.9M$351.1M$248.9M
OPERATING INCOME$140.4M$205.4M$197.0M$107.5M
NET INCOME$98.1M$159.5M$137.5M$91.4M
EPS (DILUTED)2.033.062.601.74
OPERATING CASH FLOW$156.1M$213.4M$183.5M$89.2M
CASH$170.2M$151.6M$144.3M$156.1M
LONG-TERM DEBT$619.7M$613.5M$603.2M$76.6M
BUYBACKS$75.6M$85.5M$58.1M$39.9M
SEC XBRL · FISCAL-YEAR PERIODS · AS KNOWN ON 2026-09-05 · NOBODY ELSE SHOWS FUNDAMENTALS AS OF A PAST DATE
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Public filings, honestly analyzed. Official US government sources in one desk — every figure carries the date it was filed, and the methodology is published, backtest included.

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© 2026 WAVEMAN · SOURCE: SEC EDGAR & OFFICIAL GOVERNMENT DATA · NOT INVESTMENT ADVICE · CHART BY TRADINGVIEW · UPDATED 2026-09-05 ALL SYSTEMS LIVE FOR MACHINES →