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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1420565	Aileron Therapeutics Inc	ALRN	()	4

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1315797	A Muneer Satter	C/O Aileron Therapeutics, Inc. 281 Albany Street Cambridge MA 02139		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	2017-07-05	144,773	$0.00	144,773	No	4	C	Indirect	See footnote
Common Stock	Acquisiton	2017-07-05	33,333	$15.00	178,106	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	847,721	$0.00	85,309	$0.00
Common Stock	Series E-2 Preferred Stock	Disposition	2017-07-05	183,944	$0.00	18,511	$0.00
Common Stock	Series E-3 Preferred Stock	Disposition	2017-07-05	159,548	$0.00	16,055	$0.00
Common Stock	Series F Preferred Stock	Disposition	2017-07-05	247,398	$0.00	24,896	$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 Stock 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 Stock 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.
These shares are held by the Muneer A. Satter Revocable Trust and various other trusts and entities for which the Reporting Person serves as trustee, investment advisor or manager and, in such capacity, has sole voting and dispositive power over all such shares.