Bruce Booth Insider Trading Activity

Corporate InsiderDirector · CIK 1451612

Total trades

$52.6M

Total volume

Apr 22, 2026

Last activity

SION

Sionna Therapeutics, Inc.

Bruce Booth has been net-selling over the last 12 months with 0 purchases and 73 sales across 2 different companies.

SION is the most-traded position with 50 trades. The largest single transaction was a sale of KYMR for $8.0M on Dec 10, 2025.

Performance Scorecard

Forward stock performance after each transaction by Bruce Booth. Buy returns measure price movement after open-market purchases; sell-avoided measures the loss avoided after open-market sales. Success rate counts trades where the insider's direction was right.

PERIOD	AVG BUY RETURN	AVG SELL AVOIDED	SUCCESS RATE	TRADES
30 days	—	-9.1%	32%	73
90 days	—	-16.2%	24%	66
120 days	—	-16.5%	22%	64

Performance based on stock price movement after each transaction date. Past results do not predict future returns. Not financial advice.

Price & Trades

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Recent Trades

Showing the 50 most recent of 73 disclosed trades.

DATE	TICKER	TYPE	SHARES	PRICE	VALUE	ROLE
Apr 22, 2026	KYMR	Sell	5,900	$89.96	$531K	Director
Apr 22, 2026	KYMR	Sell	88	$90.08	$8K	Director
Apr 22, 2026	KYMR	Sell	12	$90.08	$1K	Director
Apr 15, 2026	KYMR	Sell	2,750	$90.10	$248K	Director
Apr 15, 2026	KYMR	Sell	385	$90.10	$35K	Director
Apr 15, 2026	KYMR	Sell	2,200	$89.95	$198K	Director
Apr 14, 2026	KYMR	Sell	4,159	$89.97	$374K	Director
Mar 2, 2026	KYMR	Sell	71,814	$90.13	$6.5M	Director
Mar 2, 2026	KYMR	Sell	10,052	$90.13	$906K	Director
Dec 12, 2025	KYMR	Sell	108	$91.04	$10K	Director
Dec 12, 2025	KYMR	Sell	570	$91.04	$52K	Director
Dec 11, 2025	KYMR	Sell	5,125	$91.23	$468K	Director
Dec 11, 2025	KYMR	Sell	976	$91.23	$89K	Director
Dec 10, 2025	KYMR	Sell	16,338	$93.20	$1.5M	Director
Dec 10, 2025	KYMR	Sell	31,459	$88.64	$2.8M	Director
Dec 10, 2025	KYMR	Sell	17,825	$89.25	$1.6M	Director
Dec 10, 2025	KYMR	Sell	10,545	$90.14	$951K	Director
Dec 10, 2025	KYMR	Sell	47,349	$92.41	$4.4M	Director
Dec 10, 2025	KYMR	Sell	85,862	$93.20	$8.0M	Director
Dec 10, 2025	KYMR	Sell	5,979	$88.64	$530K	Director
Dec 10, 2025	KYMR	Sell	3,391	$89.25	$303K	Director
Dec 10, 2025	KYMR	Sell	2,001	$90.14	$180K	Director
Dec 10, 2025	KYMR	Sell	9,060	$92.41	$837K	Director
Oct 21, 2025	SION	Sell	22,339	$32.69	$730K	Director
Oct 21, 2025	SION	Sell	4,688	$32.69	$153K	Director
Oct 21, 2025	SION	Sell	19,948	$33.87	$676K	Director
Oct 21, 2025	SION	Sell	4,187	$33.87	$142K	Director
Oct 21, 2025	SION	Sell	5,763	$34.91	$201K	Director
Oct 21, 2025	SION	Sell	1,210	$34.91	$42K	Director
Oct 21, 2025	SION	Sell	25,327	$35.69	$904K	Director
Oct 21, 2025	SION	Sell	5,316	$35.69	$190K	Director
Oct 21, 2025	SION	Sell	83	$36.42	$3K	Director
Oct 21, 2025	SION	Sell	17	$36.42	$619.14	Director
Oct 20, 2025	SION	Sell	5,412	$32.33	$175K	Director
Oct 20, 2025	SION	Sell	25,788	$32.33	$834K	Director
Oct 20, 2025	SION	Sell	4,300	$31.79	$137K	Director
Oct 20, 2025	SION	Sell	20,485	$31.79	$651K	Director
Oct 17, 2025	SION	Sell	248	$33.47	$8K	Director
Oct 17, 2025	SION	Sell	28,821	$32.10	$925K	Director
Oct 17, 2025	SION	Sell	6,049	$32.10	$194K	Director
Oct 17, 2025	SION	Sell	21,451	$32.71	$702K	Director
Oct 17, 2025	SION	Sell	4,503	$32.71	$147K	Director
Oct 17, 2025	SION	Sell	52	$33.47	$2K	Director
Oct 16, 2025	SION	Sell	12,888	$33.38	$430K	Director
Oct 16, 2025	SION	Sell	73,296	$32.84	$2.4M	Director
Oct 16, 2025	SION	Sell	9,470	$31.69	$300K	Director
Oct 16, 2025	SION	Sell	45,117	$31.69	$1.4M	Director
Oct 16, 2025	SION	Sell	1,804	$30.15	$54K	Director
Oct 16, 2025	SION	Sell	8,596	$30.15	$259K	Director
Oct 16, 2025	SION	Sell	2,705	$33.38	$90K	Director