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sellWeak cluster of 4

Rong Zhou sold $337k of AMPH

SENIOR EVP, PRODUCTION CENTER at Amphastar Pharmaceuticals, Inc.. 6,893 shares at an average of $48.88, traded Nov 12, 2024, filed Nov 13, 2024.

Warning score
30
Value
$337k
6,893 shares
Holdings after
118,388
-6% from before
From 52-week low
-
no price yet
From 52-week high
-
no price yet

Score components

  • Role
    Officer
    +15
  • Trade size
    $337k at market
    +15
  • Share of holdings sold
    Sold 5.5% of holdings
    0
  • Cluster
    4 insiders selling within 14 days
    +15
  • Exercise and sell
    Shares came from an option exercise in the same filing
    -15

What happened after comparable sells

Same side and tier, against the S&P 500, at 1, 3 and 6 months. Shown to Pro users; the whole table is on the backtest page.

This signal so far: 1m -7.1%, 3m -30.0%, 6m -48.8%.

Price around the trade, and since

From a quarter before the trade to today. The arrow is the trade, the circle the day the filing reached EDGAR, which is the first day anyone outside could act; the dotted line is the S&P 500 rebased to that day's close.

AMPHOct 9, 2026 · close 26.62
Since filing Nov 13, 2024: -41.5%SPY +33.4% · excess -74.8%

Daily candles, adjusted for splits and dividends. Green arrows are insider buys, red are sells, sized by value; the dashed line is the close on the filing day, the dotted line SPY rebased to it.Charts by TradingView Lightweight Charts™

Rows in this filing

Every transaction in Form 4 0001415889-24-026764, as filed. Open on EDGAR

DateTransactionSharesPriceValueHoldings afterFiled
Nov 12, 2024MOption exercise
Common Stock
+6,893$14.95$103k125,281Nov 13, 2024
Nov 12, 2024SOpen-market sale
Common Stock
-6,893$48.88$337k118,388Nov 13, 2024
Nov 12, 2024MOption exercise
Employee Stock Option (right to buy)derivative
-6,893$0.00$00Nov 13, 2024

Related signals

Other insiders at Amphastar Pharmaceuticals, Inc. and this insider’s other filings.

ScoreCompanyInsiderValueHoldingsFiled
20Weak
AMPHsell 210b5-1
Amphastar Pharmaceuticals, Inc.
William J Peters
CFO, EVP & TREASURER
$103k
4,139 shares
-2%
21Weak
AMPHsell 2
Amphastar Pharmaceuticals, Inc.
Rong Zhou
SENIOR EVP, PRODUCTION CENTER
$239k
10,000 shares
-6%
23Weak
AMPHsell
Amphastar Pharmaceuticals, Inc.
Rong Zhou
SENIOR EVP, PRODUCTION CENTER
$75k
3,187 shares
-2%
21Weak
AMPHsell 2
Amphastar Pharmaceuticals, Inc.
Rong Zhou
SENIOR EVP, PRODUCTION CENTER
$256k
9,787 shares
-7%
33Weak
AMPHsell 2
Amphastar Pharmaceuticals, Inc.
Floyd F. Petersen
director
$108k
4,163 shares
-6%
23Weak
AMPHsell 2
Amphastar Pharmaceuticals, Inc.
Richard K Prins
director
$113k
4,179 shares
-11%
30Weak
AMPHsell 2
Amphastar Pharmaceuticals, Inc.
Floyd F. Petersen
director
$442k
16,679 shares
-18%
0Weak
AMPHsell10b5-1
Amphastar Pharmaceuticals, Inc.
Floyd F. Petersen
director
$13k
500 shares
-1%
0Weak
AMPHsell10b5-1
Amphastar Pharmaceuticals, Inc.
Floyd F. Petersen
director
$14k
500 shares
-1%
0Weak
AMPHsell10b5-1
Amphastar Pharmaceuticals, Inc.
Floyd F. Petersen
director
$15k
500 shares
-1%

Not investment advice. Scores and forward returns are decision support built from public SEC filings and past prices; they describe what happened after comparable filings, not what will happen after this one. Do your own research and size your risk.

Rong Zhou sold $337k of AMPH | InsiderTell