The proposed sale is small relative to the company's market cap and appears to be a routine diversification move following RSU vesting. Monitor for any subsequent Form 4 filings to confirm execution, but no immediate market impact is expected.
Price Chart
Executive Summary
William J. Peters, an officer of Amphastar Pharmaceuticals, filed a Form 144 notice of intent to sell 4,139 shares of common stock, with an estimated aggregate market value of approximately $103,475. The shares were acquired via RSU vesting on March 17, 2024. The filing is a routine advance notice of a proposed sale by an insider, with no indication of material non-public information or urgency.
Key Facts
- Insider: William J. Peters (Officer)
- Proposed sale: 4,139 shares of common stock
- Estimated market value: ~$103,475
- Shares acquired via RSU vesting on 03/17/2024
- Broker: UBS Financial Services Inc.
- Filing date: 09/21/2026
Financial Impact
Proposed sale of ~$103,475 in shares, representing a small fraction of the issuer's market cap (approximately $4.25 billion based on filing context).
Risk Factors
- Insider selling could signal reduced conviction if followed by larger or more frequent filings.
- Form 144 is an intent to sell; the actual sale may not occur.
Investment Themes
Documents Analyzed
This report is based on 3 SEC documents filed with EDGAR.
| Document | Accession Number |
|---|---|
| 144 Filing (Primary) | 0001969223-26-001034 |
| Document: 0001969223-26-001034-index.html | 0001969223-26-001034 |
| Document: 0001969223-26-001034.txt | 0001969223-26-001034 |
Track record builds as more directional reports settle.
Filters
| Type | Now | ||||
|---|---|---|---|---|---|
Sep 23, 2026 4w ago | Insider Cluster | $26.27 | awaiting T+60 | — | $25.32 (−3.62%) |
Sep 21, 2026 4w ago | 144 | $24.32 | awaiting T+60 | — | $25.32 (+4.11%) |
Aug 21, 2026 9w ago | Institutional Cluster | $21.60 | awaiting T+60 | — | $25.32 (+17.22%) |
Aug 12, 2026 10w ago | Insider Cluster | $20.18 | awaiting T+60 | — | $25.32 (+25.47%) |
Aug 11, 2026 10w ago | 144 | $20.31 | awaiting T+60 | — | $25.32 (+24.67%) |
Jul 13, 2026 15w ago | 8-K | $19.29 $25.91 | ▲ +34.32% | ▲ +30.32% | $25.32 (+31.26%) |
Jul 7, 2026 15w ago | 8-K | $18.88 $25.35 | ▼ −34.27% | ▼ −31.78% | $25.32 (−34.11%) |
Apr 13, 2026 27w ago | DEFA14A | $21.38 $19.02 | ▼ −11.04% | ▼ −19.56% | $25.32 (+18.43%) |
US Market Status
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