The sale appears to be part of a routine 10b5-1 plan for tax withholding or diversification following RSU vesting. The small size relative to market cap and pre-planned nature suggest no material signal. Monitor for any acceleration of insider selling beyond the disclosed plan.
Price Chart
Executive Summary
Susan Bobulsky, an officer of Adaptive Biotechnologies, filed a Form 144 on October 6, 2026, indicating intent to sell 6,444 shares of common stock with an approximate market value of $192,289. The shares were acquired through vesting of restricted stock units from March 2023 to March 2024. The filing also notes prior 10b5-1 plan sales in July-September 2026, suggesting this is part of a pre-arranged trading program rather than a discretionary insider sale.
Key Facts
- Officer Susan Bobulsky filed Form 144 to sell 6,444 shares of common stock.
- Estimated aggregate market value of the proposed sale is $192,288.96.
- Shares were acquired via vesting of restricted stock units between March 2023 and March 2024.
- Prior 10b5-1 plan sales occurred on July 16, July 30, August 10, and September 15, 2026.
- The filing date is October 6, 2026.
Financial Impact
Proposed sale of 6,444 shares valued at ~$192,289, representing a small fraction of the company's market cap.
Risk Factors
- Insider selling, even under a 10b5-1 plan, can be perceived negatively by the market.
Investment Themes
Documents Analyzed
This report is based on 3 SEC documents filed with EDGAR.
| Document | Accession Number |
|---|---|
| 144 Filing (Primary) | 0001950047-26-010075 |
| Document: 0001950047-26-010075-index.html | 0001950047-26-010075 |
| Document: 0001950047-26-010075.txt | 0001950047-26-010075 |
Filters
| Type | Now | ||||
|---|---|---|---|---|---|
Oct 6, 2026 20d ago | 144 | $26.28 | awaiting T+20 | — | $26.27 (−0.04%) |
Oct 5, 2026 21d ago | Insider Cluster | $26.90 | awaiting T+20 | — | $26.27 (−2.34%) |
Sep 25, 2026 4w ago | Press Release | $29.43 $25.51 | ▼ −13.32% | ▼ −11.84% | $26.27 (−10.74%) |
Sep 18, 2026 5w ago | Insider Cluster | $27.86 $23.95 | ▲ +14.03% | ▲ +13.13% | $26.27 (+5.71%) |
Aug 20, 2026 9w ago | Insider Cluster | $25.99 $27.86 | ▲ +7.20% | ▲ +7.72% | $26.27 (+1.08%) |
Aug 19, 2026 9w ago | Insider Cluster | $25.44 $28.55 | ▼ −12.22% | ▼ −12.22% | $26.27 (−3.26%) |
Aug 18, 2026 9w ago | 144 | $25.49 $26.68 | ▲ +4.67% | ▲ +6.19% | $26.27 (+3.06%) |
Aug 17, 2026 10w ago | 144 | $24.56 $27.67 | ▼ −12.66% | ▼ −13.97% | $26.27 (−6.96%) |
Jul 29, 2026 12w ago | Institutional Cluster | $24.18 $26.44 | ▼ −9.35% | ▼ −5.38% | $26.27 (−8.64%) |
Jul 23, 2026 13w ago | Insider Cluster | $22.27 $25.99 | ▲ +16.70% | ▲ +13.08% | $26.27 (+17.96%) |
US Market Status
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