Timothy A. Springer is a beneficial owner of more than 10% of Tectonic Therapeutic, Inc. (TECX), as disclosed in SEC ownership filings. SEC records also connect Springer to Cartesian Therapeutics, Inc. (RNAC). Springer has reported 9 insider filings with the SEC since 2024. The most recent filing was in June 2026.
Every role Timothy A. Springer has reported on a Form 4, reconstructed from the filings themselves. Reporting insiders must state their relationship to the issuer (officer title, director seat, or 10% ownership) on every filing.
Tectonic Therapeutic, Inc. (TECX)1 filingUpdated Aug 30, 2026
Timothy A. Springer files SEC Form 4 reports at Tectonic Therapeutic, Inc. (TECX). 9 SEC Form 4 filings on record going back to 2024, most recently on 10 June 2026. Most recent open-market trade: bought $876K of TECX on 11 April 2025. Lifetime open-market purchases: $35.08M. Historical track record: 3/5 stars across 41 tracked purchases.
Every recent SEC Form 4 transaction Timothy A. Springer has reported, most recent first.
InsiderAlpha computes a forward-return-based score for every insider with enough Form 4 purchase history. The metrics below reflect realized performance after each tracked open-market purchase.
| Metric | Value |
|---|---|
| InsiderAlpha rating | ★★★☆☆ (3/5) |
| Total purchases tracked | 41 |
| Purchases with forward-return data | 41 |
| 30-day win rate | 56% |
| 90-day win rate | 54% |
| Avg 5-day return | +5.29% |
| Avg 30-day return | +1.29% |
| Avg 90-day return | +4.33% |
| Best 30-day return |
InsiderAlpha's records for Timothy A. Springer go back to 2024: 9 primary Form 4 filings, an average of 3.0 per year. The typical open-market purchase is $856K (41 buys totaling $35.08M). The largest single buy on record is $10.08M of TECX in 2024. No transaction on record carries a Rule 10b5-1 flag - the filings look discretionary rather than pre-scheduled, which makes their timing more informative as a signal.
Insiders who reported open-market trades in the last 12 months at the companies Timothy A. Springer files at. Multiple unrelated insiders buying the same stock within a short window, cluster buying, has historically been one of the strongest Form 4 signals.
Other corporate insiders with significant SEC Form 4 track records on InsiderAlpha:
Timothy A. Springer is a corporate insider of Tectonic Therapeutic, Inc. (TECX). InsiderAlpha holds 9 primary Form 4 filings for them, the earliest from 2024, updated as new SEC EDGAR filings are processed.
1 primary Form 4 filing in the last 90 days, covering 1 company.
Recorded transactions: 41 open-market purchases ($35.08M) and 0 open-market sales across all tracked filings.
Across 41 tracked purchases, Timothy A. Springer averaged +1.3% avg 30-day return with a 56% 30-day win rate. InsiderAlpha rates the track record at 3/5 stars.
All Form 4 filings, transaction values, and 10b5-1 plan flags are listed on this page and updated in real time as new SEC EDGAR filings are processed.
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$TECX Tectonic Therapeutic, Inc.4.9K shares @ $15.23$74K
| +28.16% |