William D Baird III

Date	Company	Security	Transaction	Code	Indirect	10b5-1	$Price	#Shares	$Value	#Remaining
6 Jan 25	TSVT 2seventy bio	Common Stock	Grant	Acquire A	No	No	0	264,000	0.00	1,126,126
6 Jan 25	TSVT 2seventy bio	Stock Option Common Stock	Grant	Acquire A	No	No	2.64	176,000	464.64 k	176,000
6 Jan 25	TSVT 2seventy bio	Common Stock	Sell	Dispose S	No	No	2.7785	763	2.12 k	862,126
3 Jan 25	TSVT 2seventy bio	Common Stock	Sell	Dispose S	No	No	2.9359	31,718	93.12 k	862,889
1 Jul 24	TSVT 2seventy bio	Common Stock	Grant	Acquire A	No	No	0	586,022	0.00	894,607
1 Apr 24	TSVT 2seventy bio	Common Stock	Grant	Acquire A	No	No	0	56,250	0.00	308,585
1 Apr 24	TSVT 2seventy bio	Stock Options Common Stock	Grant	Acquire A	No	No	5.79	112,500	651.38 k	112,500
8 Jan 24	TSVT 2seventy bio	Common Stock	Grant	Acquire A	No	No	0	91,000	0.00	252,335
8 Jan 24	TSVT 2seventy bio	Stock Option Common Stock	Grant	Acquire A	No	No	3.97	182,000	722.54 k	182,000
5 Jan 24	TSVT 2seventy bio	Common Stock	Sell	Dispose S	No	No	3.7536	1,380	5.18 k	161,335

Data from 3, 4 and 5 filings. Values as filed, not updated for current price.