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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1661998	Homology Medicines Inc.	FIXX	()	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 Corporate Centre 27 Hospital Road George Town, Grand Cayman E9 KY1-9008	No	No	Yes	No
1735397	Rock Springs Capital Llc	650 South Exeter St. Suite 1070 Baltimore MD 21202	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	2018-04-02	395,845	$0.00	395,845	No	4	C	Indirect	See footnote
Common Stock	Acquisiton	2018-04-02	250,000	$16.00	645,845	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	Series B Preferred Stock	Disposition	2018-04-02	395,845	$0.00	395,845	$0.00

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
0			No	4	C	Indirect

Footnotes

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 securities held directly by Master Fund.
Upon closing of the Issuer's initial public offering, each share of preferred stock was automatically converted into one share of the Issuer's common stock.