GSK (GSK) SC 13D/ASpero Therapeutics / GLAXOSMITHKLINE ownership change

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

SCHEDULE 13D

INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO § 240.13d-1(a) AND AMENDMENTS
THERETO FILED PURSUANT TO 240.13d-2(a) UNDER THE SECURITIES EXCHANGE ACT OF 1934
(Amendment No. 6)*

SPERO THERAPEUTICS, INC.

(Name of Issuer)

Common Stock, Par Value $0.001

(Title of Class of Securities)

84833T 10 3

(CUSIP Number)

Victoria A. Whyte

(Name, Address and Telephone Number of Person
Authorized to Receive Notices and Communications)

August 5, 2021

(Date of Event which Requires Filing of this Statement)

If the filing person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because of §§240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the following box. ☐

Note: Schedules filed in paper format shall include a signed original and five copies of the schedule, including all exhibits. See §240.13d-7 for other parties to whom copies are to be sent.

^* The remainder of this cover page shall be filled out for a reporting person's initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be deemed to be "filed" for the purpose of Section 18 of the Securities Exchange Act of 1934 ("Act") or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act.

Item 1.  Security and Issuer.

This Amendment No. 6 to Schedule 13D (this “Statement”) amends and supplements the statement on Schedule 13D originally filed on November 16, 2017 and amended on July 17, 2018, September 19, 2018, February 14, 2020, June 4, 2020 and December 7, 2020 (the “Schedule 13D”) with respect to the shares of common stock, par value $0.001 per share (the “Common Stock”), of Spero Therapeutics, Inc., a Delaware corporation (the “Issuer”). GlaxoSmithKline plc is filing this amendment to reflect its new percentage beneficial ownership in the Issuer, which has decreased as a result of an increase in the outstanding Common Stock of the Issuer. The Issuer’s principal executive offices are located at 675 Massachusetts Avenue, 14^th Floor, Cambridge, Massachusetts 02139.

Item 2. Identity and Background.

The response set forth in Item 2 of the Schedule 13D is hereby amended by deleting Schedule 1 in its entirety and replacing it with Schedule 1 attached

Item 5.  Interest in Securities of the Issuer.

The response set forth in Item 5 of the Schedule 13D is hereby amended by deleting the previous response in its entirety and replacing it with the following:

(a), (b) The information contained in rows 7, 8, 9, 10, 11, and 13 on each of the cover pages of this Statement is incorporated by reference in its entirety into this Item 5.

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

Date: September 16, 2021

Schedule 1