SEC FORM 3

SEC FORM 3SEC Form 3

FORM 3

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

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

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

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1. Name and Address of Reporting Person^*

Donati Piergiorgio

(Last)

(First)

(Middle)

EPFL INNOVATION PARK, BUILDING B

(Street)

LAUSANNE

1015

(City)

(State)

(Zip)

SWITZERLAND

(Country)

2. Date of Event Requiring Statement (Month/Day/Year)
03/20/2026

3. Issuer Name and Ticker or Trading Symbol
AC Immune SA [ ACIU ]

3a. Foreign Trading Symbol

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

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

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

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 Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)
Common Shares	141,120⁽¹⁾	D

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
1. Title of Derivative Security (Instr. 4)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
Share Option (right to buy)	⁽²⁾	07/05/2028	Common Shares	7,200	$9.5	D
Share Option (right to buy)	⁽²⁾	06/27/2029	Common Shares	41,322	$5.39	D
Share Option (right to buy)	⁽²⁾	06/25/2030	Common Shares	34,562	$6.95	D
Share Option (right to buy)	⁽²⁾	06/24/2031	Common Shares	28,463	$7.23	D
Share Option (right to buy)	⁽²⁾	06/23/2032	Common Shares	22,050	$3.15	D
Share Option (right to buy)	⁽²⁾	12/31/2032	Common Shares	66,667	$2.03	D
Share Option (right to buy)	⁽³⁾	12/31/2033	Common Shares	27,607	$3.99	D
Share Option (right to buy)	⁽⁴⁾	12/31/2034	Common Shares	61,538	$2.91	D
Share Option (right to buy)	⁽⁵⁾	12/31/2035	Common Shares	89,552	$3.03	D

Explanation of Responses:

1. Includes 136,620 common shares underlying outstanding restricted share units.

2. The share option is fully vested.

3. The share option will vest in twelve substantially equal quarterly installments beginning on March 31, 2024.

4. The share option will vest in twelve substantially equal quarterly installments beginning on March 31, 2025.

5. The share option will vest in twelve substantially equal quarterly installments beginning on March 31, 2026.

Remarks:

Exhibit 24 - Power of Attorney

	/s/ Matthias Maurer, attorney-in-fact for Piergiorgio Donati	03/20/2026
	** 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 5 (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.
* Form 3: SEC 1473 (03-26)

SEC Form 3 filed by new insider Donati Piergiorgio