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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1745020	Theseus Pharmaceuticals Inc.	THRX	()	DE

Insiders

Cik	Name	Reported Address	Director	Officer	Large Shareholder	Other
1595725	Rock Springs Capital Management Lp	650 South Exeter St., Suite 1070 Baltimore MD 21202	No	No	Yes	No
1735393	Rock Springs Capital Master Fund Lp	C/O Walkers Corporate Limited, Cayman Co Center 27 Hospital Road Georage Town E9 KY-1-9008	No	No	Yes	No
1735397	Rock Springs Capital Llc	650 South Exeter St., Suite 1070 Baltimore MD 2102	No	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	Acquisiton	2021-10-12	349,320	$0.00	349,320	No	4	C	Indirect	See Footnote
Common Stock	Acquisiton	2021-10-12	87,329	$0.00	87,329	No	4	C	Indirect	See Footnote
Common Stock	Acquisiton	2021-10-12	250,000	$16.00	599,320	No	4	P	Indirect	See Footnote

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	C	Indirect	See Footnote
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	Series B Convertible Preferred Stock	Disposition	2021-10-12	349,320	$0.00	349,320	$0.00
Common Stock	Series B Convertible Preferred Stock	Disposition	2021-10-12	87,329	$0.00	87,329	$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 total represents shares received upon conversion of shares of Series B Convertible Preferred Stock.
The reported security converted into the issuer's Common Stock on a one-for-one basis automatically immediately prior to the closing of the issuer's initial public offering without payment of further consideration. The shares have no expiration date.
The securities reported herein are held of record by Rock Springs Capital Master Fund LP ("Master Fund"). Rock Springs Capital LLC ("RSC") is the general partner of Rock Springs Capital Management LP ("RSCM") which is the investment manager to Master Fund. RSC and RSCM may therefore be deemed to have or share beneficial ownership of the shares held directly by Master Fund.
The securities reported herein are held of record by Four Pines Master Fund LP ("Four Pines"). RSC is the general partner of RSCM which is the investment manager to Four Pines. RSC and RSCM may therefore be deemed to have or share beneficial ownership of the shares held directly by Four Pines.
Represents shares purchased in the issuer's initial public offering.