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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1555279	908 Devices Inc.	MASS	()	4

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1219039	Keith Crandell	8755 West Higgins Road Suite 1025 Chicago IL 60631		Yes	No	Yes	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Common Stock, Par Value $0.001	Acquisiton	2020-12-22	5,425,045	$0.00	5,425,045	No	4	C	Indirect	See Footnote
Common Stock, Par Value $0.001	Acquisiton	2020-12-22	300,000	$20.00	5,725,045	No	4	P	Indirect	See Footnote

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	C	Indirect	See Footnote
No	4	P	Indirect	See Footnote

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock, Par Value $0.001	Series A Preferred Stock	Disposition	2020-12-22	2,927,386	$0.00	2,927,386	$0.00
Common Stock, Par Value $0.001	Series B Preferred Stock	Disposition	2020-12-22	981,443	$0.00	981,443	$0.00
Common Stock, Par Value $0.001	Series C Preferred Stock	Disposition	2020-12-22	669,977	$0.00	669,977	$0.00
Common Stock, Par Value $0.001	Series D Preferred Stock	Disposition	2020-12-22	665,661	$0.00	665,661	$0.00
Common Stock, Par Value $0.001	Series E Preferred Stock	Disposition	2020-12-22	180,578	$0.00	180,578	$0.00

Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
No	4	C	Indirect
No	4	C	Indirect
No	4	C	Indirect
No	4	C	Indirect
No	4	C	Indirect

Footnotes

Each share of Series A Preferred Stock, Series B Preferred Stock, Series C Preferred Stock, Series D Preferred Stock and Series E Preferred Stock (collectively, the "Preferred Shares") converted into 0.61459 shares of the Issuer's Common Stock automatically upon the closing of the Issuer's initial public offering without payment of additional consideration. The Preferred Shares were convertible at any time at the holder's election and automatically upon the closing of the Issuer's initial public offering, and had no expiration date.
The securities are owned directly by ARCH Venture Fund VII, L.P. ("ARCH Fund VII"). The sole general partner of ARCH Fund VII is ARCH Venture Partners VII, L.P. ("ARCH Partners VII"), which may be deemed to be the beneficial owner of the securities held by ARCH Fund VII. The sole general partner of ARCH Partners VII is ARCH Venture Partners VII, LLC ("ARCH VII LLC"), which may be deemed to be the beneficial owner of the securities held by ARCH Fund VII. The reporting person is a managing director of ARCH VII LLC, and may be deemed to beneficially own the securities held by ARCH Fund VII. The reporting person disclaims beneficial ownership of such securities, except to the extent of his pecuniary interest therein.