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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1894562	Prime Medicine Inc.	PRME	Biological Products, (No Disgnostic Substances) (2836)	000000000

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1922939	Thomas Cahill	C/O Prime Medicine, Inc. 21 Erie Street Cambridge MA 02139		Yes	No	No	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	Acquisiton	2022-10-24	4,905,679	$0.00	4,905,679	No	4	C	Indirect	By Newpath Partners, L.P.
Common Stock	Acquisiton	2022-10-24	400,000	$17.00	5,305,679	No	4	P	Indirect	By Newpath Partners, L.P.

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	C	Indirect	By Newpath Partners, L.P.
No	4	P	Indirect	By Newpath Partners, L.P.

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Series A Convertible Preferred Stock	Disposition	2022-10-24	9,999,999	$0.00	3,216,674	$0.00
Common Stock	Series B Convertible Preferred Stock	Disposition	2022-10-24	5,250,781	$0.00	1,689,005	$0.00

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
0			No	4	C	Indirect
0			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 Newpath Partners, L.P. ("Newpath LP"). Newpath Partners GP, L.P. ("Newpath GP LP") is the general partner of Newpath LP. Newpath Partners GP, LLC ("Newpath GP LLC") is the general partner of Newpath GP LP. The Reporting Person is a managing member of Newpath GP LLC, and disclaims beneficial ownership of the shares held directly by Newpath LP 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.
Reflects shares purchased by Newpath LP in the Issuer's initial public offering.