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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1445283	Proteostasis Therapeutics Inc.	PTI	Pharmaceutical Preparations (2834)	000000000

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1273885	M Franklin Berger	200 Technology Square, 4Th Floor Cambridge MA 02139		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	2016-02-17	71,932	$0.00	71,932	No	4	C	Direct
Common Stock	Acquisiton	2016-02-17	25,000	$8.00	96,932	No	4	P	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	C	Direct
No	4	P	Direct

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Series B Convertible Redeemable Preferred Stock	Disposition	2016-02-17	777,604	$0.00	71,932	$0.00

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

Footnotes

This transaction represents the total number of shares of Issuer Common Stock received upon the conversion of the Issuer's Series B Convertible Redeemable Preferred Stock (the "Series B Shares").
These securities were purchased in the initial public offering of the Issuer.
The Series B Shares automatically converted into Issuer Common Stock on a 10.8102-to-1 basis upon the closing of the initial public offering of the Issuer without payment or further consideration. The Series B Shares were convertible at any time at the election of the Reporting Person and had no expiration date.