Initial Statement of Beneficial Ownership (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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(Print or Type Responses)

1. Name and Address of Reporting Person * BIOGEN INC. 2. Date of Event Requiring Statement (Month/Day/Year) 03/31/2026 3. Issuer Name and Ticker or Trading Symbol Apellis Pharmaceuticals, Inc. [APLS] (Last) (First) (Middle) 225 BINNEY STREET 4. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner _____ Officer (give title below) __X__ Other (specify below) See footnotes 5. If Amendment, Date Original Filed (Month/Day/Year) (Street) CAMBRIDGE, MA 02142 6. Individual or Joint/Group Filing (Check Applicable Line) _X_ Form filed by One Reporting Person ___ Form filed by More than One Reporting Person (City) (State) (Zip) 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 Stock 0(1)(2)(3) I(1)(2)(3) See footnotes(1)(2)(3) Common Stock 0(4) I(4) See footnotes(4)

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.			SEC 1473 (7-02)
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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 of Derivative Security: 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
Stock Options	(5)	(5)	Common Stock	0(5)	$0	I(1)(2)(3)(5)	See footnotes(1)(2)(3)(5)

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
BIOGEN INC. 225 BINNEY STREET CAMBRIDGE, MA 02142				See footnotes

Signatures

/s/ Wendell Taylor, Secretary, Biogen Inc.		04/06/2026
**Signature of Reporting Person		Date

Explanation of Responses:

*	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).
(1)	The reporting person entered into a Tender and Support Agreement, dated March 31, 2026 (the "Tender and Support Agreement") with respect to the shares of common stock, par value $0.0001 per share (the "Common Stock"), of Apellis Pharmaceuticals, Inc. (the "Issuer") held by each of (i) Morningside Venture Investments, Ltd., (ii) Cedric Francois, (iii) Gerald Chan, (iv) Alec Machiels, and (v) Pascal Deschatelets (each, a "Holder" and, collectively, the "Holders").
(2)	By virtue of entering into the Tender and Support Agreement, dated March 31, 2026, with each of the Holders, the reporting person on this Form 3 may be deemed to be a member of a "group" for purposes of Section 13(d) of the Securities and Exchange Act of 1934, as amended (the "Exchange Act") with respect to the securities held by parties who continue to be bound by the Tender and Support Agreement, which such "group" beneficially owns (as defined in Section 13(d) of the Exchange Act), in the aggregate, more than 10% of the outstanding Common Stock. Pursuant to the Tender and Support Agreement, the Holders agreed to irrevocably and unconditionally appoint the reporting person, or any person designated by the reporting person, as its proxy and attorney-in-fact to vote such Holders' Common Stock for certain matters as set forth in the Tender and Support Agreement.
(3)	The Tender and Support Agreement does not provide the reporting person with a pecuniary interest in the Common Stock and as such the reporting person is not a beneficial owner for purposes of Section 16 of the Exchange Act.
(4)	Each of Messrs Chan, Deschatelets, Francois and Machiels holds Restricted Stock Units ("RSUs") in the amount and on the terms reported on each of Messrs Chan, Deschatelets, Francois and Machiels' past and current Form 3 and Form 4 filings with respect to the Issuer, as amended. The Tender and Support Agreement does not provide the reporting person with a pecuniary interest in the Common Stock underlying such RSUs and as such the reporting person is not a beneficial owner for purposes of Section 16 of the Exchange Act.
(5)	Each of Messrs Chan, Deschatelets, Francois and Machiels holds options for Common Stock (the "Options"), which are currently outstanding and unexercised as of March 31, 2026, in the amount and on the terms reported on each of Messrs Chan, Deschatelets, Francois and Machiels' past and current Form 3 and Form 4 filings with respect to the Issuer, as amended. The Tender and Support Agreement does not provide the reporting person with a pecuniary interest in the Common Stock underlying such Options and as such the reporting person is not a beneficial owner for purposes of Section 16 of the Exchange Act.

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