SEC FORM 4

SEC FORM 4 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

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

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

BVF PARTNERS L P/IL

(Last)

(First)

(Middle)

44 MONTGOMERY ST.

40TH FLOOR

(Street)

SAN FRANCISCO

94104

(City)

(State)

(Zip)

2. Issuer Name and Ticker or Trading Symbol
ESSA Pharma Inc. [ EPIX ]

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

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

3. Date of Earliest Transaction (Month/Day/Year)
10/09/2025

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

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

	Form filed by One Reporting Person
X	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)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Common Stock⁽¹⁾	10/09/2025		U⁽²⁾		6,194,145	D	⁽⁶⁾	0	D⁽³⁾
Common Stock⁽¹⁾	10/09/2025		U⁽²⁾		4,726,743	D	⁽⁶⁾	0	D⁽⁴⁾
Common Stock⁽¹⁾	10/09/2025		U⁽²⁾		560,797	D	⁽⁶⁾	0	D⁽⁵⁾

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)
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)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)

1. Name and Address of Reporting Person^*

BVF PARTNERS L P/IL

(Last)

(First)

(Middle)

44 MONTGOMERY ST.

40TH FLOOR

(Street)

SAN FRANCISCO

94104

(City)

(State)

(Zip)

Relationship of Reporting Person(s) to Issuer

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

1. Name and Address of Reporting Person^*

BIOTECHNOLOGY VALUE FUND L P

(Last)

(First)

(Middle)

44 MONTGOMERY ST.

40TH FLOOR

(Street)

SAN FRANCISCO

94104

(City)

(State)

(Zip)

Relationship of Reporting Person(s) to Issuer

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

1. Name and Address of Reporting Person^*

BVF I GP LLC

(Last)

(First)

(Middle)

44 MONTGOMERY ST.

40TH FLOOR

(Street)

SAN FRANCISCO

94104

(City)

(State)

(Zip)

Relationship of Reporting Person(s) to Issuer

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

1. Name and Address of Reporting Person^*

BIOTECHNOLOGY VALUE FUND II LP

(Last)

(First)

(Middle)

44 MONTGOMERY ST.

40TH FLOOR

(Street)

SAN FRANCISCO

94104

(City)

(State)

(Zip)

Relationship of Reporting Person(s) to Issuer

Director		10% Owner
Officer (give title below)	X	Other (specify below)
		See Explanation of Responses

1. Name and Address of Reporting Person^*

BVF II GP LLC

(Last)

(First)

(Middle)

44 MONTGOMERY ST.

40TH FLOOR

(Street)

SAN FRANCISCO

94104

(City)

(State)

(Zip)

Relationship of Reporting Person(s) to Issuer

Director		10% Owner
Officer (give title below)	X	Other (specify below)
		See Explanation of Responses

1. Name and Address of Reporting Person^*

Biotechnology Value Trading Fund OS LP

(Last)

(First)

(Middle)

P.O. BOX 309 UGLAND HOUSE

(Street)

GRAND CAYMAN

KY1-1104

(City)

(State)

(Zip)

Relationship of Reporting Person(s) to Issuer

Director		10% Owner
Officer (give title below)	X	Other (specify below)
		See Explanation of Responses

1. Name and Address of Reporting Person^*

BVF Partners OS Ltd.

(Last)

(First)

(Middle)

P.O. BOX 309 UGLAND HOUSE

(Street)

GRAND CAYMAN

KY1-1104

(City)

(State)

(Zip)

Relationship of Reporting Person(s) to Issuer

Director		10% Owner
Officer (give title below)	X	Other (specify below)
		See Explanation of Responses

1. Name and Address of Reporting Person^*

BVF GP HOLDINGS LLC

(Last)

(First)

(Middle)

44 MONTGOMERY ST.

40TH FLOOR

(Street)

SAN FRANCISCO

94104

(City)

(State)

(Zip)

Relationship of Reporting Person(s) to Issuer

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

1. Name and Address of Reporting Person^*

BVF INC/IL

(Last)

(First)

(Middle)

44 MONTGOMERY ST.

40TH FLOOR

(Street)

SAN FRANCISCO

94104

(City)

(State)

(Zip)

Relationship of Reporting Person(s) to Issuer

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

1. Name and Address of Reporting Person^*

LAMPERT MARK N

(Last)

(First)

(Middle)

44 MONTGOMERY ST.

40TH FLOOR

(Street)

SAN FRANCISCO

94104

(City)

(State)

(Zip)

Relationship of Reporting Person(s) to Issuer

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

Explanation of Responses:

1. This Form 4 is filed jointly by Biotechnology Value Fund, L.P. ("BVF"), Biotechnology Value Fund II, L.P. ("BVF2"), Biotechnology Value Trading Fund OS LP ("Trading Fund OS"), BVF Partners OS Ltd. ("Partners OS"), BVF I GP LLC ("BVF GP"), BVF II GP LLC ("BVF2 GP"), BVF GP Holdings LLC ("BVF GPH"), BVF Partners L.P. ("Partners"), BVF Inc. and Mark N. Lampert (collectively, the "Reporting Persons"). Each of the Reporting Persons is a member of a Section 13(d) group. Each of the Reporting Persons disclaims beneficial ownership of the securities reported herein except to the extent of his or its pecuniary interest therein.

2. This Form 4 reports securities disposed of pursuant to an arrangement under Section 288 of the Business Corporations Act (British Columbia) involving the Issuer, XenoTherapeutics, Inc. (the "Parent"), Xeno Acquisition Corp. (the "Purchaser"), a wholly-owned subsidiary of Parent, and XOMA Royalty Corporation pursuant to a business combination agreement dated July 13, 2025, and the plan of arrangement, pursuant to which, among other things, the Purchaser acquired all of the outstanding shares of common stock of the Issuer, effective October 9, 2025 (the "Merger").

3. Securities owned directly by BVF. As the general partner of BVF, BVF GP may be deemed to beneficially own the securities owned directly by BVF. As the sole member of BVF GP, BVF GPH may be deemed to beneficially own the securities owned directly by BVF. As the investment manager of BVF, Partners may be deemed to beneficially own the securities owned directly by BVF. As the investment adviser and general partner of Partners, BVF Inc. may be deemed to beneficially own the securities owned directly by BVF. As a director and officer of BVF Inc., Mr. Lampert may be deemed to beneficially own the securities owned directly by BVF.

4. Securities owned directly by BVF2. As the general partner of BVF2, BVF2 GP may be deemed to beneficially own the securities owned directly by BVF2. As the sole member of BVF2 GP, BVF GPH may be deemed to beneficially own the securities owned directly by BVF2. As the investment manager of BVF2, Partners may be deemed to beneficially own the securities owned directly by BVF2. As the investment adviser and general partner of Partners, BVF Inc. may be deemed to beneficially own the securities owned directly by BVF2. As a director and officer of BVF Inc., Mr. Lampert may be deemed to beneficially own the securities owned directly by BVF2.

5. Securities owned directly by Trading Fund OS. As the general partner of Trading Fund OS, Partners OS may be deemed to beneficially own the securities owned directly by Trading Fund OS. As the investment manager of Trading Fund OS and the sole member of Partners OS, Partners may be deemed to beneficially own the securities owned directly by Trading Fund OS. As the investment adviser and general partner of Partners, BVF Inc. may be deemed to beneficially own the securities owned directly by Trading Fund OS. As a director and officer of BVF Inc., Mr. Lampert may be deemed to beneficially own the securities owned directly by Trading Fund OS.

6. The Reporting Persons received the following in exchange for each share of the Issuer's common stock disposed of in connection with the Merger: $0.124231 in cash per share of common stock (excluding the approximately $1.69 of cash per share of common stock previously distributed to the Issuer's shareholders) and one contingent value right per share of common stock for potential cash payments of up to approximately $0.14 per share of common stock.

	BVF Partners L.P., By: BVF Inc., its general partner, By: /s/ Mark N. Lampert, President	10/14/2025
	Biotechnology Value Fund, L.P., By: BVF I GP LLC, its general partner, By: /s/ Mark N. Lampert, Chief Executive Officer	10/14/2025
	BVF I GP LLC, By: /s/ Mark N. Lampert, Chief Executive Officer	10/14/2025
	Biotechnology Value Fund II, L.P., By: BVF II GP LLC, its general partner, By: /s/ Mark N. Lampert, Chief Executive Officer	10/14/2025
	BVF II GP LLC, By: /s/ Mark N. Lampert, Chief Executive Officer	10/14/2025
	BVF Partners OS Ltd., By: BVF Partners L.P., its sole member, By: BVF Inc., its general partner, By: /s/ Mark N. Lampert, President	10/14/2025
	Biotechnology Value Trading Fund OS LP, By: BVF Partners L.P., its investment manager, BVF Inc., its general partner, By: /s/ Mark N. Lampert, President	10/14/2025
	BVF GP Holdings LLC, By: /s/ Mark N. Lampert, Chief Executive Officer	10/14/2025
	BVF Inc., By: /s/ Mark N. Lampert, President	10/14/2025
	/s/ Mark N. Lampert	10/14/2025
	** 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).
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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.

SEC Form 4 filed by Large owner Bvf Partners L P/Il