Melanie Gloria - May 4, 2023 Form 4 Insider Report for ACELYRIN, Inc. (SLRN)

Role: Chief Operating Officer
Signature: /s/ Mina Kim, Attorney-in-fact
Stock symbol: SLRN
Transactions as of: May 4, 2023
Transactions value $: $0
Form type: 4
Date filed: 5/4/2023, 08:03 PM
Next filing: May 11, 2023

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Underlying Class	Amount	Exercise Price	Ownership	Footnotes
transaction	SLRN	Employee Stock Option (right to buy)	Award	$0	+232K		$0.00	232K	May 4, 2023	Class A Common Stock	232K	$18.00	Direct	F1, F2

Showing 1 to 1 of 1 entries

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	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.
F2	Each share of Class A Common Stock shall be reclassified into one share of Common Stock immediately prior to the completion of the Issuer's initial public offering of Common Stock.