Melanie Gloria - May 9, 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 9, 2023
Transactions value $: $0
Form type: 4
Date filed: 5/11/2023, 08:56 PM
Previous filing: May 4, 2023
Next filing: Aug 18, 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)	Other	$0	-330K	-100%	$0.00^*	0	May 9, 2023	Class A Common Stock	330K	$4.04	Direct	F1, F2
transaction	SLRN	Employee Stock Option (right to buy)	Other	$0	+330K		$0.00	330K	May 9, 2023	Common Stock	330K	$4.04	Direct	F1, F2
transaction	SLRN	Employee Stock Option (right to buy)	Other	$0	-188K	-100%	$0.00^*	0	May 9, 2023	Class A Common Stock	188K	$5.88	Direct	F1, F3
transaction	SLRN	Employee Stock Option (right to buy)	Other	$0	+188K		$0.00	188K	May 9, 2023	Common Stock	188K	$5.88	Direct	F1, F3
transaction	SLRN	Employee Stock Option (right to buy)	Other	$0	-232K	-100%	$0.00^*	0	May 9, 2023	Class A Common Stock	232K	$18.00	Direct	F1, F4
transaction	SLRN	Employee Stock Option (right to buy)	Other	$0	+232K		$0.00	232K	May 9, 2023	Common Stock	232K	$18.00	Direct	F1, F4

Showing 1 to 6 of 6 entries

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

Explanation of Responses:

Id	Content
F1	Each share of Class A Common Stock was reclassified into one share of Common Stock immediately prior to the completion of the Issuer's initial public offering of Common Stock.
F2	1/4 of the shares subject to the option vested on November 8, 2022 and 1/48 of the shares subject to the option vest in equal monthly installments thereafter, subject to the Reporting Person's continued service.
F3	1/4 of the shares subject to the option vest on November 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.
F4	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.