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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1420565	Aileron Therapeutics Inc	ALRN	Pharmaceutical Preparations (2834)	000000000

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1709976	Jr. M. Brian Gallagher	C/O S.r. One, Limited 161 Washinton Street, Suite 500 Conshohocken PA 19428		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	2017-07-05	1,158,186	$0.00	1,158,186	No	4	C	Indirect	See Footnote
Common Stock	Acquisiton	2017-07-05	273,333	$15.00	1,431,519	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 D Preferred Stock	Disposition	2017-07-05	6,781,770	$0.00	682,476	$0.00
Common Stock	Series E-2 Preferred Stock	Disposition	2017-07-05	1,471,551	$0.00	148,088	$0.00
Common Stock	Series E-3 Preferred Stock	Disposition	2017-07-05	1,276,389	$0.00	128,448	$0.00
Common Stock	Series F Preferred Stock	Disposition	2017-07-05	1,979,188	$0.00	199,173	$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

Footnotes

The Series D, Series E-2, Series E-3 and Series F Preferred converted into Common Stock on a 9.937-for-one basis upon the closing of the Issuer's initial public offering without payment of consideration. The Series D, Series E-2, Series E-3 and Series F Preferred were convertible at any time at the holder's election and automatically upon the closing of the Issuer's initial public offering. The shares had no expiration date.
S.R. One, Limited, an indirect wholly-owned subsidiary of GlaxoSmithKline plc, is the record holder of these shares. Dr. Brian M. Gallagher, Jr. is a partner and Vice President at S.R. One, Limited and an employee of GlaxoSmithKline LLC, an indirect wholly-owned subsidiary of GlaxoSmithKline plc. Dr. Gallagher disclaims beneficial ownership of all shares held by S.R. One, Limited and this report shall not be deemed an admission of beneficial ownership of such shares for the purpose of Section 16 or for any other purpose except to the extent of his pecuniary interest therein.