908 DEVICES INC

Ticker: MASS CUSIP: 65443P102 Class: Common Stock

Casdin Capital, LLC's Holding History (CIK: 0001534261)

Note: Option positions (PUT/CALL) are excluded.

Q4 2021

Shares 406,502 Value ($000) $10,516 Avg Close $29.42 Range $22.21 - $39.34

Q3 2021

Shares 406,502 Value ($000) $13,219 Avg Close $33.97 Range $29.20 - $39.81

Q2 2021

Shares 406,502 Value ($000) $15,752 Avg Close $45.29 Range $33.71 - $55.83

Q1 2021

Shares 406,502 Value ($000) $19,715 Avg Close $57.14 Range $38.88 - $79.60

Q4 2020

Shares 406,502 Value ($000) $23,150 Avg Close $58.41 Range $43.25 - $74.00

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2021	406,502	$10,516	$29.42	$22.21 - $39.34
Q3 2021	406,502	$13,219	$33.97	$29.20 - $39.81
Q2 2021	406,502	$15,752	$45.29	$33.71 - $55.83
Q1 2021	406,502	$19,715	$57.14	$38.88 - $79.60
Q4 2020	406,502	$23,150	$58.41	$43.25 - $74.00