As of the latest Form 4 filed Jan 21, 2026.
What Cabaletta Bio Inc insiders — officers, directors and 10% owners — have bought and sold in their own stock, straight from their SEC Form 4 filings. Values are shares × the reported transaction price where both are disclosed.
Buys plotted up, sells down; bar height is the disclosed dollar value (shares × reported price). Our Form 4 history is only complete from mid-2026, so early months are sparse — the series fills in as more filings land. Open-market purchases and sales only.
Newest filing first — the 8 most recent filings for CABA.
| Filed | Trade date | Insider | Transaction | Shares | Price | Value | 10b5-1 | Filing |
|---|---|---|---|---|---|---|---|---|
| 2026-01-21 | 2026-01-21 | Chang David J. Chief Medical Officer | PPurchase | +8.80K | $2.26 | $19.9K | No | Form 4 ↗ |
| 2026-01-21 | 2026-01-21 | Binder Gwendolyn President, Science & Tech. | PPurchase | +11.3K | $2.19 | $24.8K | No | Form 4 ↗ |
| 2026-01-21 | 2026-01-21 | Tomasello Shawn Director | PPurchase | +22.7K | $2.21 | $50.3K | No | Form 4 ↗ |
| 2026-01-21 | 2026-01-21 | Gavel Steve Chief Commercial Officer | PPurchase | +22.2K | $2.27 | $50.2K | No | Form 4 ↗ |
| 2026-01-21 | 2026-01-21 | Bollard Catherine Director | PPurchase | +4.41K | $2.27 | $9.98K | No | Form 4 ↗ |
| 2026-01-21 | 2026-01-21 | Nichtberger Steven President & CEO | PPurchase | +45.0K | $2.24 | $101K | No | Form 4 ↗ |
| 2026-01-21 | 2026-01-21 | Simon Mark Director | PPurchase | +11.1K | $2.28 | $25.3K | No | Form 4 ↗ |
| 2026-01-21 | 2026-01-21 | Gerard Michael General Counsel | PPurchase | +6.60K | $2.27 | $15.0K | No | Form 4 ↗ |
Insiders — a company’s officers, directors and holders of more than 10% of its stock — must report any trade in that stock to the SEC on a Form 4 within two business days. Each row here is one transaction from those filings.
The transaction code tells you what happened: Purchase (P) and Sale (S) are open-market trades — the ones markets watch most; Award (A) is a granted stock or unit, Option exercise (M) converts options into shares, and Gift (G) is a transfer for no consideration. Awards, exercises and gifts are largely compensation or administrative, not a directional bet.
One caveat on sales: many are made under a Rule 10b5-1 plan scheduled months in advance, so a sale is not automatically a bearish signal. Insider activity is a noisy input — read it alongside the filings, not on its own.
See also CABA’s full analysis or the market-wide insider trading feed. The tabs above jump to CABA’s other SEC data.
Source: SEC Form 4 filings for CABA, parsed from EDGAR. Transaction prices are as reported in the filing — SEC public-domain data, not market quotes. Values are shares × reported price where both are disclosed; grants and gifts often carry no price. A delayed record of what insiders reported, not a live position or a recommendation.
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