// company-profile
Amphastar Pharmaceuticals, Inc.
AMPH// activity-summary
Recent insider activity is bullish. Over the last 30 days, 10 insiders purchased shares versus 1 sale. Buying was led by Gerst Diane G..
// 90-day insight
Over the last 90 days, Amphastar Pharmaceuticals, Inc. insiders bought $0 (10 transactions) and sold $14K (1 transaction).
- Most active insider: Lee Howard with 3 transactions totaling $14K.
- Largest single sale: $14K by Lee Howard on Jun 2, 2026.
Activity skews bullish — buys outpace sales.
Institutional Ownership
Top 13F-HR holders of Amphastar Pharmaceuticals, Inc. as of 2026-03-31
Data source: SEC Form 13F-HR filings. Joined with insider activity above — see who's loading up institutionally while insiders are trading. Full 13F-HR API →
Insider Transactions
Sourced from SEC EDGAR Form 4 filings. Updated hourly.
| Date | Insider | Company | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Jun 2, 2026 | Lee Howard | AMPH | Tax Withholding | 769 | $18.45 | $14K |
| Jun 1, 2026 | Gerst Diane G. | AMPH | Award | 8,143 | $0.00 | $0K |
| Jun 1, 2026 | Lee Howard | AMPH | Award | 8,143 | $0.00 | $0K |
| Jun 1, 2026 | Gerst Diane G. | AMPH | Award | 17,365 | $0.00 | $0K |
| Jun 1, 2026 | ZASLOFF MICHAEL A | AMPH | Award | 17,365 | $0.00 | $0K |
45 more transactions hidden
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