RA Capital's sustained and accelerating accumulation at ~$9-10/share suggests a near-term catalyst (e.g., clinical data, partnership, or financing). Traders should monitor for upcoming press releases or SEC filings (e.g., 8-K, SC 13D amendment) and consider building a long position with a stop below the cluster's average cost (~$9.30). The strong historical win rate on ARTV insider-buy signals (67% at T+20) supports a bullish bias.
Price Chart
Executive Summary
RA Capital Management, a 10% owner and director, purchased a total of ~281K shares of Artiva Biotherapeutics for ~$2.58M across three open-market buys from July 14-21, 2026. This follows a separate cluster of RA Capital purchases totaling ~$2.58M in the prior week (July 21-23), bringing the combined insider buying to ~$5.2M over a ~10-day period. At a $248M market cap, this represents ~2.1% of the company, a highly material signal from a sophisticated healthcare investor with board representation, indicating strong conviction ahead of a potential catalyst.
Key Financial Metrics
Key Facts
- RA Capital Management (Director, 10% Owner) purchased ~281K shares for ~$2.58M across three open-market buys from July 14-21, 2026.
- Combined with a separate cluster of RA Capital purchases from July 21-23 (~$2.58M), total insider buying over ~10 days is ~$5.2M.
- Total insider buying represents ~2.1% of ARTV's $248M market cap, exceeding the >2% threshold for highly material insider activity.
- RA Capital is a sophisticated healthcare-focused investment firm with board representation, amplifying the signal's credibility.
- Historical performance on ARTV insider-buy reports shows strong average T+20 returns (+9.56%) and a 67% win rate, supporting the bullish read.
Financial Impact
Insider purchases totaling ~$5.2M (~2.1% of market cap) from a 10% owner/director over ~10 days
Risk Factors
- Biotech clinical-stage risk: any negative data readout or regulatory setback could reverse the signal.
- Insider buying by a single large holder may reflect portfolio allocation rather than a near-term catalyst.
- High concentration of buying from one entity reduces diversification of the signal.
Market Snapshot
Investment Themes
Documents Analyzed
This report is based on 1 SEC document filed with EDGAR.
| Document | Accession Number |
|---|---|
| INSIDER-BUY Data (Synthetic) | 0001231919-26-000791 |
Filters
| Type | Now | ||||
|---|---|---|---|---|---|
Sep 11, 2026 20d ago | 8-K | $10.14 $8.91 | ▼ −12.13% | ▼ −11.67% | $6.86 (−32.35%) |
Sep 9, 2026 23d ago | Insider Cluster | $10.79 $10.42 | ▼ −3.43% | ▼ −2.83% | $6.86 (−36.42%) |
Sep 9, 2026 23d ago | Insider Cluster | $10.79 $10.42 | ▼ −3.43% | ▼ −2.83% | $6.86 (−36.42%) |
Sep 9, 2026 23d ago | Insider Cluster | $10.79 $10.42 | ▼ −3.43% | ▼ −2.83% | $6.86 (−36.42%) |
Sep 9, 2026 23d ago | Insider Cluster | $10.79 $10.42 | ▼ −3.43% | ▼ −2.83% | $6.86 (−36.42%) |
Sep 9, 2026 23d ago | Insider Cluster | $10.79 $10.42 | ▲ +3.43% | ▲ +2.83% | $6.86 (+36.42%) |
Sep 4, 2026 28d ago | Insider Cluster | $11.19 $10.88 | ▼ −2.77% | ▼ −2.22% | $6.86 (−38.70%) |
Aug 15, 2026 6w ago | Institutional Cluster | $11.74 $11.68 | ▼ −0.51% | ▲ +0.16% | $6.86 (−41.57%) |
Jul 31, 2026 8w ago | Insider Buy | $10.76 $11.07 | ▲ +2.88% | ▲ +1.08% | $6.86 (−36.25%) |
Jul 28, 2026 9w ago | Insider Buy | $10.53 $10.02 | ▼ −4.84% | ▼ −3.30% | $6.86 (−34.85%) |
US Market Status
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