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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1656536	Decibel Therapeutics Inc.	DBTX	()	E9

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1534265	Casdin Partners Master Fund, L.p.	1350 Avenue Of The Americas, Suite 2600 New York NY 10019		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	2021-02-17	546,421	$0.00	546,421	No	4	C	Indirect	See footnote
Common Stock	Acquisiton	2021-02-17	575,000	$18.00	1,121,421	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	2021-02-17	2,896,032	$0.00	546,421	$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

On February 17, 2021, the Series D Preferred Stock automatically converted into Common Stock on a 5.3-for-one basis without payment of further consideration upon closing of the initial public offering of the Issuer's common stock. The shares had no expiration date.
The securities are owned directly by Casdin Partners Master Fund, L.P. and may be deemed to be indirectly beneficially owned by (i) Casdin Capital, LLC, the investment adviser to Casdin Partners Master Fund, L.P., (ii) Casdin Partners GP, LLC, the general partner of Casdin Partners Master Fund L.P., and (iii) Eli Casdin, the managing member of Casdin Capital, LLC and Casdin Partners GP, LLC.