Peter Kolchinsky Insider Trades

Companies

• BBTXDirector

  Bambusa Therapeutics, Inc.

  1 buy, $46.6M · 1 alert in our log

• LENZ10% owner

  Lenz Therapeutics, Inc.

  1 sell, $9.1M

• SIONDirector

  Sionna Therapeutics, Inc.

  1 sell, $21.8M

• SEPNDirector

  Septerna, Inc.

  1 sell, $63.5M

• ARTVDirector

  Artiva Biotherapeutics, Inc.

  5 buys, $5.1M

• PBLSDirector

  Parabilis Medicines, Inc.

  1 buy, $6.9M

Reported Trades

Open-market transactions only (code P and S), outside any 10b5-1 plan, dated by the day the filing reached EDGAR. Each row links to the filing.

Filed	Company	Trade	Value	Shares	Source
Nov 3, 2026	BBTXDirector	buy	$46.6M	2,953,820	Form 4
Nov 2, 2026	LENZ10% owner	sell97.9% of stake	$9.1M	2,718,684	Form 4
Sep 21, 2026	SIONDirector	sell50% of stake	$21.8M	3,448,811	Form 4
Aug 14, 2026	SEPNDirector	sell67.3% of stake	$63.5M	1,493,000	Form 4
Jul 31, 2026	ARTVDirector	buy	$456K	45,768	Form 4
Jul 28, 2026	ARTVDirector	buy	$413K	41,319	Form 4
Jul 23, 2026	ARTVDirector	buy	$2.6M	264,586	Form 4
Jul 22, 2026	PBLSDirector	buy	$6.9M	244,593	Form 4
Jul 20, 2026	ARTVDirector	buy	$1.4M	160,354	Form 4
Jul 14, 2026	ARTVDirector	buy	$194K	21,654	Form 4

Other Insiders at These Companies

Everyone else who reported a significant open-market trade at the same companies in the last 180 days. Several insiders buying at once is cluster buying.

• Ra Capital Management, L.P.Director at BBTX1 buy, $46.6MNov 3, 2026
• Ra Capital Healthcare Fund LPDirector at BBTX1 buy, $46.6MNov 3, 2026
• Ra Capital Nexus Fund Iii, L.P.Director at BBTX1 buy, $46.6MNov 3, 2026
• Rajeev M. ShahDirector at BBTX1 buy, $46.6MNov 3, 2026
• Salvia Investment GmbH10% owner at BBTX1 buy, $6.0MNov 2, 2026
• Helmut Wolfgang JeggleDirector at BBTX1 buy, $6.0MNov 2, 2026
• Ra Capital Nexus Fund, L.P.Director at SION1 sell, $21.8MSep 21, 2026