SEC 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* BVF GP HOLDINGS LLC (Last) (First) (Middle) 44 MONTGOMERY ST., 40TH FLOOR (Street) SAN FRANCISCO CA 94104 (City) (State) (Zip)	2. Date of Event Requiring Statement (Month/Day/Year) 06/01/2020	3. Issuer Name and Ticker or Trading Symbol Merus N.V. [ MRUS ]
		4. Relationship of Reporting Person(s) to Issuer (Check all applicable) Director X 10% Owner Officer (give title below) Other (specify below)	5. 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 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, (euro)0.09 nominal value per share(1)	1,804,105	I	See footnote(2)
Common Shares, (euro)0.09 nominal value per share(1)	1,386,889	I	See footnote(3)

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)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

1. Name and Address of Reporting Person* BVF GP HOLDINGS LLC (Last) (First) (Middle) 44 MONTGOMERY ST., 40TH FLOOR (Street) SAN FRANCISCO CA 94104 (City) (State) (Zip)

1. Name and Address of Reporting Person* BVF I GP LLC (Last) (First) (Middle) 44 MONTGOMERY ST., 40TH FLOOR (Street) SAN FRANCISCO CA 94104 (City) (State) (Zip)

1. Name and Address of Reporting Person* BVF II GP LLC (Last) (First) (Middle) 44 MONTGOMERY ST., 40TH FLOOR (Street) SAN FRANCISCO CA 94104 (City) (State) (Zip)

Explanation of Responses:

1. This Form 3 is filed jointly by BVF I GP LLC ("BVF GP"), BVF II GP LLC ("BVF2 GP") and BVF GP HOLDINGS LLC ("BVF GPH", and together with BVF GP and BVF2 GP, the "Reporting Persons"). Each of the Reporting Persons is a member of a Section 13(d) group that collectively owns more than 10% of the Issuer's outstanding Common Shares. Each of the Reporting Persons disclaims beneficial ownership of the securities reported herein except to the extent of its pecuniary interest therein.

2. Securities owned directly by Biotechnology Value Fund, L.P. ("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.

3. Securities owned directly by Biotechnology Value Fund II, L.P. ("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.

	BVF I GP LLC, By: BVF GP HOLDINGS LLC, its sole member, By: /s/ Mark N. Lampert, Chief Executive Officer	06/03/2020
	BVF II GP LLC, By: BVF GP HOLDINGS LLC, its sole member, By: /s/ Mark N. Lampert, Chief Executive Officer	06/03/2020
	BVF GP HOLDINGS LLC, By: /s/ Mark N. Lampert, Chief Executive Officer	06/03/2020
	** 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).
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