Merus N.V. — Director's Dealing 2020

Jan 14, 2020

SEC Form 3 — Initial Statement of Beneficial Ownership

Issuer: Merus N.V. (MRUS)
CIK: 0001651311
Period of Report: 2020-01-01

Reporting Person: BVF PARTNERS L P/IL (10% Owner)
Reporting Person: BIOTECHNOLOGY VALUE FUND L P (See Explanation of Responses)
Reporting Person: BIOTECHNOLOGY VALUE FUND II LP (See Explanation of Responses)
Reporting Person: Biotechnology Value Trading Fund OS LP (See Explanation of Responses)
Reporting Person: BVF Partners OS Ltd. (See Explanation of Responses)
Reporting Person: BVF INC/IL (10% Owner)
Reporting Person: LAMPERT MARK N (10% Owner)

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Shares, (euro)0.09 nominal value per share	1604215	Direct
Common Shares, (euro)0.09 nominal value per share	1249220	Direct
Common Shares, (euro)0.09 nominal value per share	219170	Direct

Footnotes

F1: This Form 3 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 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 that collectively owns more than 10% of the Issuer's outstanding Common Shares, (euro)0.09 nominal value per share. Each of the Reporting Persons disclaims beneficial ownership of the securities reported herein except to the extent of his or its pecuniary interest therein.

F2: Securities owned directly by BVF. As the general partner 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.

F3: Securities owned directly by BVF2. As the general partner 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.

F4: 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.