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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1674365	Aptinyx Inc.	APTX	()	4

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1578965	Adam Koppel	C/O Bain Capital Life Sciences Investors Llc, 200 Clarendon Street Boston MA 02116		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	Acquisiton	2020-01-14	3,333,333	$3.00	5,558,425	No	4	P	Indirect	See Footnotes

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

Footnotes

On January 14, 2020, the Bain Capital Life Sciences Fund, L.P. ("BCLS") and BCIP Life Sciences Associates, LP ("BCIP LS" and, collectively, the "Bain Life Sciences Entities") purchased, in the aggregate, 3,333,333 shares of Common Stock of the Issuer at a price of $3.00 per share, pursuant to an underwritten public offering.
Represents shares of Common Stock held directly by the Bain Life Sciences Entities.
Bain Capital Life Sciences Investors, LLC ("BCLSI") is the ultimate general partner of BCLS and governs the investment strategy and decision making process with respect to investments held by BCIP LS. Dr. Koppel is a manager of BCLSI. By virtue of the relationships described in this footnote, Dr. Koppel may be deemed to share voting and dispositive power with respect to all of the shares of Common Stock held by the Bain Life Sciences Entities. Dr. Koppel disclaims beneficial ownership except to the extent of his pecuniary interest therein.