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Filing Details

Accession Number:: 0001628280-22-027124
Form Type:: 4
Zero Holdings:: No
Publication Time:: 2022-10-26 20:01:15
Reporting Period:: 2022-10-24

Accepted Time:: 2022-10-26 20:01:15
SEC Url:: Form 4 Filing

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1894562	Prime Medicine Inc.	PRME	()	4

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1219042	Robert Nelsen	8755 West Higgins Road, Suite 1025 Chicago IL 60631		Yes	No	Yes	No

Reported Non-Derivative Transactions

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Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Common Stock	Acquisiton	2022-10-24	5,728,297	$0.00	5,728,297	No	4	C	Indirect	By ARCH Venture Fund X, L.P.
Common Stock	Acquisiton	2022-10-24	5,728,297	$0.00	5,728,297	No	4	C	Indirect	By ARCH Venture Fund X Overage, L.P.
Common Stock	Acquisiton	2022-10-24	400,000	$17.00	6,128,297	No	4	P	Indirect	By ARCH Venture Fund X, L.P.
Common Stock	Acquisiton	2022-10-24	400,000	$17.00	6,128,297	No	4	P	Indirect	By ARCH Venture Fund X Overage, L.P.
Common Stock	Acquisiton	2022-10-24	16,080	$0.00	16,080	No	4	C	Indirect	See footnote

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	C	Indirect	By ARCH Venture Fund X, L.P.
No	4	C	Indirect	By ARCH Venture Fund X Overage, L.P.
No	4	P	Indirect	By ARCH Venture Fund X, L.P.
No	4	P	Indirect	By ARCH Venture Fund X Overage, L.P.
No	4	C	Indirect	See footnote

Reported Derivative Transactions

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Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Series A Convertible Preferred Stock	Disposition	2022-10-24	16,666,667	$0.00	5,361,122	$0.00
Common Stock	Series A Convertible Preferred Stock	Disposition	2022-10-24	16,666,664	$0.00	5,361,122	$0.00
Common Stock	Series B Convertible Preferred Stock	Disposition	2022-10-24	1,141,474	$0.00	367,175	$0.00
Common Stock	Series B Convertible Preferred Stock	Disposition	2022-10-24	1,141,474	$0.00	367,175	$0.00
Common Stock	Series A Convertible Preferred Stock	Disposition	2022-10-24	49,999	$0.00	16,080	$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

The shares of Series A Convertible Preferred Stock and Series B Convertible Preferred Stock (together, the "Preferred Stock") were convertible into Common Stock on a one-for-3.10880 basis at any time at the option of the holder, and automatically converted into the number of shares shown in Column 7 immediately prior to the closing of the Issuer's initial public offering on October 24, 2022. The Preferred Stock had no expiration date.
Represents shares held directly by ARCH Venture Fund X, L.P. ("ARCH X"). ARCH Venture Partners X, L.P. ("AVP X LP") is the sole general partner of ARCH X.
ARCH Venture Partners X, LLC ("AVP X LLC") is the sole general partner of each of AVP X LP and AVP X Overage LP. The Reporting Person is a member of the investment committee of AVP X LLC, and may be deemed to share the power to direct the disposition and vote of the shares held by ARCH X and ARCH X Overage. The Reporting Person disclaims beneficial ownership except to the extent of any pecuniary interest therein, and this report shall not be deemed an admission that such shares are beneficially owned by him for Section 16 or any other purpose.
Represents shares held directly by ARCH Venture Fund X Overage, L.P. ("ARCH X Overage"). ARCH Venture Partners X Overage, L.P. ("AVP X Overage LP") is the sole general partner of ARCH X Overage.
Reflects shares purchased by ARCH X in the Issuer's initial public offering.
Reflects shares purchased by ARCH X Overage in the Issuer's initial public offering.
Shares held by a trust for the benefit of family members of the Reporting Person.