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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1962918	Acelyrin Inc.	SLRN	()	4

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1659625	O Henry Gosebruch	C/O Acelyrin, Inc. 4149 Liberty Canyon Rd. Agoura Hills CA 91301		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	2023-05-09	50,000	$18.00	50,000	No	4	P	Direct

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

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Class A Common Stock	Director Stock Option (right to buy)	Disposition	2023-05-09	155,450	$0.00	155,450	$7.43
Common Stock	Director Stock Option (right to buy)	Acquisiton	2023-05-09	155,450	$0.00	155,450	$7.43

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
0		2033-03-22	No	4	J	Direct
155,450		2033-03-22	No	4	J	Direct

Footnotes

Reflects shares purchased through a directed share program in the Issuer's initial public offering of Common Stock (the "IPO").
Each share of Class A Common Stock was reclassified into one share of Common Stock immediately prior to the completion of the IPO.
1/48 of the shares subject to the option vested on April 17, 2023 and 1/48 of the shares subject to the option vests in equal monthly installments thereafter, subject to the Reporting Person's continued service.