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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
1574591	Mardi Dier	C/O Acelyrin, Inc. 4149 Liberty Canyon Rd. Agoura Hills CA 91301	Cfo And Cbo	No	Yes	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	5,556	$18.00	5,556	No	4	P	Direct
Common Stock	Acquisiton	2023-05-09	875	$18.00	875	No	4	P	Indirect	See footnote
Common Stock	Acquisiton	2023-05-09	875	$18.00	875	No	4	P	Indirect	See footnote

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	P	Direct
No	4	P	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
Class A Common Stock	Employee Stock Option (right to buy)	Disposition	2023-05-09	673,621	$0.00	673,621	$5.88
Common Stock	Employee Stock Option (right to buy)	Acquisiton	2023-05-09	673,621	$0.00	673,621	$5.88
Class A Common Stock	Employee Stock Option (right to buy)	Disposition	2023-05-09	85,226	$0.00	85,226	$18.00
Common Stock	Employee Stock Option (right to buy)	Acquisiton	2023-05-09	85,226	$0.00	85,226	$18.00

Remaning Holdings	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
0	2032-11-20	No	4	J	Direct
673,621	2032-11-20	No	4	J	Direct
0	2033-05-03	No	4	J	Direct
85,226	2033-05-03	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").
The shares are held of record by one of the Reporting Person's children.
The shares are held of record by another one of the Reporting Person's children.
Each share of Class A Common Stock was reclassified into one share of Common Stock immediately prior to the completion of the IPO.
1/4 of the shares subject to the option vest on November 15, 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.
1/4 of the shares subject to the option vest on May 4, 2024, and 1/48 of the shares subject to the option vest in equal monthly installments thereafter, subject to the Reporting Person's continued service.