Acelyrin (SLRN) Form 4 ACELYRIN / Paul Peloso ownership change

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:	3235-0287
Estimated average burden
hours per response:	0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

1. Name and Address of Reporting Person^*

Peloso Paul

(Last) (First) (Middle)

C/O ACELYRIN, INC.

4149 LIBERTY CANYON RD.

(Street)

AGOURA HILLS CA 91301

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
ACELYRIN, Inc. [ SLRN ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director	10% Owner
X	Officer (give title below)	Other (specify below)
Chief Medical Officer

3. Date of Earliest Transaction (Month/Day/Year)
05/09/2023

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	05/09/2023		P		6,000(1)	A	$18	6,000	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Employee Stock Option (right to buy)	$0.7683	05/09/2023		J(2)			173,681	(3)	07/25/2031	Class A Common Stock(2)	173,681	$0.00	0	D
Employee Stock Option (right to buy)	$0.7683	05/09/2023		J(2)		173,681		(3)	07/25/2031	Common Stock(2)	173,681	$0.00	173,681	D
Employee Stock Option (right to buy)	$4.0426	05/09/2023		J(2)			156,500	(4)	01/19/2032	Class A Common Stock(2)	156,500	$0.00	0	D
Employee Stock Option (right to buy)	$4.0426	05/09/2023		J(2)		156,500		(4)	01/19/2032	Common Stock(2)	156,500	$0.00	156,500	D
Employee Stock Option (right to buy)	$5.8766	05/09/2023		J(2)			187,988	(5)	11/20/2032	Class A Common Stock(2)	187,988	$0.00	0	D
Employee Stock Option (right to buy)	$5.8766	05/09/2023		J(2)		187,988		(5)	11/20/2032	Common Stock(2)	187,988	$0.00	187,988	D
Employee Stock Option (right to buy)	$18	05/09/2023		J(2)			154,957	(6)	05/03/2033	Class A Common Stock(2)	154,957	$0.00	0	D
Employee Stock Option (right to buy)	$18	05/09/2023		J(2)		154,957		(6)	05/03/2033	Common Stock(2)	154,957	$0.00	154,957	D

Explanation of Responses:

1. Reflects shares purchased through a directed share program in the Issuer's initial public offering of Common Stock (the "IPO").

2. Each share of Class A Common Stock was reclassified into one share of Common Stock immediately prior to the completion of the IPO.

3. 1/4 of the shares subject to the option vested on May 16, 2022 and 1/48 of the shares subject to the option vests in equal monthly installments thereafter, subject to the Reporting Person's continued service.

4. 1/4 of the shares subject to the option vested on January 20, 2023, and 1/48 of the shares subject to the option vest in equal monthly installments thereafter, subject to the Reporting Person's continued service.

5. 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.

6. 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.

Remarks:

	/s/ Mina Kim, Attorney-in-fact	05/11/2023
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.