This is the fourth insider sale filing from the same officer within one week, signaling a routine option-exercise/cash-out cycle but at an elevated frequency. For a $1.5B biotech with no disclosed near-term catalyst, the concentrated selling is a modest negative signal. Historical reports on ANAB have shown poor T+20 performance (avg -9.4%), suggesting caution. Monitor for additional Form 4 filings or a material change in corporate outlook that could explain the selling.
Price Chart
Executive Summary
Dennis Mulroy, an officer of AnaptysBio, filed a Form 144 notice of intent to sell 10,000 shares of common stock, valued at approximately $593,008 based on the filing date price. This follows three prior sales in the same week totaling 35,467 shares for ~$2.16M, indicating a concentrated selling pattern by an insider.
Key Facts
- Form 144 filed on 2026-05-22 by officer Dennis Mulroy
- Proposed sale of 10,000 shares of common stock
- Estimated value: ~$593,008 at market price on filing date
- Shares acquired via stock option exercise on 05/22/2026 for cash
- Three prior open-market sales by Mulroy in the preceding week: 15,467 shares on 05/21 ($928k), 10,000 on 05/19 ($599k), 10,000 on 05/15 ($633k)
- Cumulative insider sales by Mulroy in the past week: ~45,467 shares for ~$2.75M
Financial Impact
Proposed additional sale of ~$593k; combined week of insider selling totals ~$2.75M against a $1.5B market cap
Risk Factors
- Insider selling may indicate lack of confidence in near-term share appreciation
- Historical T+20 performance on ANAB filings has been negative across several prior reads
- Biotech sector volatility could amplify any negative sentiment from insider sales
Market Snapshot
Investment Themes
Documents Analyzed
This report is based on 3 SEC documents filed with EDGAR.
| Document | Accession Number |
|---|---|
| 144 Filing (Primary) | 0001950047-26-004947 |
| Document: 0001950047-26-004947-index.html | 0001950047-26-004947 |
| Document: 0001950047-26-004947.txt | 0001950047-26-004947 |
Filters
| Type | Now | ||||
|---|---|---|---|---|---|
Aug 12, 2026 7w ago | Institutional Cluster | $56.02 $53.87 | ▼ −3.84% | ▼ −2.09% | $48.53 (−13.37%) |
Jun 29, 2026 13w ago | 144 | $67.50 $53.61 | ▲ +20.58% | ▲ +19.55% | $48.53 (+28.10%) |
Jun 29, 2026 13w ago | DEFA14A | $67.50 $53.61 | ▼ −20.58% | ▼ −19.55% | $48.53 (−28.10%) |
Jun 26, 2026 14w ago | 144 | $65.97 $54.15 | ▲ +17.92% | ▲ +17.64% | $48.53 (+26.44%) |
Jun 22, 2026 14w ago | 8-K | $59.43 $50.29 | ▼ −15.38% | ▼ −16.54% | $48.53 (−18.34%) |
Jun 17, 2026 15w ago | 144 | $57.51 $54.15 | ▲ +5.84% | ▲ +6.38% | $48.53 (+15.61%) |
Jun 15, 2026 15w ago | 144 | $57.61 $62.51 | ▼ −8.51% | ▼ −8.31% | $48.53 (+15.76%) |
Jun 11, 2026 16w ago | 144 | $56.07 $66.39 | ▼ −18.41% | ▼ −16.63% | $48.53 (+13.45%) |
Jun 10, 2026 16w ago | 144 | $54.24 $66.59 | ▼ −22.77% | ▼ −20.88% | $48.53 (+10.53%) |
Jun 8, 2026 16w ago | 144 | $51.63 $67.33 | ▼ −30.40% | ▼ −28.95% | $48.53 (+6.00%) |
US Market Status
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