SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549


SCHEDULE 13D/A

Under the Securities Exchange Act of 1934

(Amendment No. 1)


SYNLOGIC, INC.
(Name of Issuer)


Common Stock, par value $0.001 per share
(Title of Class of Securities)


87166L209
(CUSIP Numbers)


JACOB MA-WEAVER
CABLE CAR CAPITAL, LP, 601 California Street, Suite 1151
San Francisco, CA, 94108
415-857-1965


ANDREW FREEDMAN, ESQ.
OLSHAN FROME WOLOSKY LLP, 1325 Avenue of the Americas
New York, NY, 10019
212-451-2300
(Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications)

04/02/2026
(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. ☐

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 (however, see the Notes).




SCHEDULE 13D/A
CUSIP Number(s):
87166L209


1 Name of reporting person

Funicular Funds, LP
2 Check the appropriate box if a member of a Group (See Instructions)

☐  (a)
☐  (b)
3SEC use only
4 Source of funds (See Instructions)

WC
5 Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)

☐
6 Citizenship or place of organization

DELAWARE
Number of Shares Beneficially Owned by Each Reporting Person With:
7 Sole Voting Power: 3,312,219.00
8 Shared Voting Power: 0.00
9 Sole Dispositive Power: 3,312,219.00
10 Shared Dispositive Power: 0.00
11 Aggregate amount beneficially owned by each reporting person

3,312,219.00
12 Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)

☐
13 Percent of class represented by amount in Row (11)

28.3 %
14 Type of Reporting Person (See Instructions)

PN



SCHEDULE 13D/A
CUSIP Number(s):
87166L209


1 Name of reporting person

Cable Car Capital, LP
2 Check the appropriate box if a member of a Group (See Instructions)

☐  (a)
☐  (b)
3SEC use only
4 Source of funds (See Instructions)

AF
5 Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)

☐
6 Citizenship or place of organization

DELAWARE
Number of Shares Beneficially Owned by Each Reporting Person With:
7 Sole Voting Power: 3,312,219.00
8 Shared Voting Power: 0.00
9 Sole Dispositive Power: 3,312,219.00
10 Shared Dispositive Power: 0.00
11 Aggregate amount beneficially owned by each reporting person

3,312,219.00
12 Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)

☐
13 Percent of class represented by amount in Row (11)

28.3 %
14 Type of Reporting Person (See Instructions)

IA, PN

Comment for Type of Reporting Person: Formerly known as Cable Car Capital LLC


SCHEDULE 13D/A
CUSIP Number(s):
87166L209


1 Name of reporting person

Ma-Weaver Jacob
2 Check the appropriate box if a member of a Group (See Instructions)

☐  (a)
☐  (b)
3SEC use only
4 Source of funds (See Instructions)

OO
5 Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)

☐
6 Citizenship or place of organization

UNITED STATES
Number of Shares Beneficially Owned by Each Reporting Person With:
7 Sole Voting Power: 3,312,219.00
8 Shared Voting Power: 0.00
9 Sole Dispositive Power: 3,312,219.00
10 Shared Dispositive Power: 0.00
11 Aggregate amount beneficially owned by each reporting person

3,312,219.00
12 Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)

☐
13 Percent of class represented by amount in Row (11)

28.3 %
14 Type of Reporting Person (See Instructions)

IN




SCHEDULE 13D/A

Item 1.Security and Issuer
(a) Title of Class of Securities:

Common Stock, par value $0.001 per share
(b) Name of Issuer:

SYNLOGIC, INC.
(c) Address of Issuer's Principal Executive Offices:

PO BOX 30, WINCHESTER, MASSACHUSETTS , 01890.
Item 1 Comment: The following constitutes Amendment No. 1 to the Schedule 13D filed by the undersigned ("Amendment No. 1") relating to the Common Stock, par value $0.001 per share (the "Shares"), of Synlogic, Inc. (the "Issuer"). This Amendment No. 1 amends the Schedule 13D filed by the Reporting Persons as specifically set forth herein. Capitalized terms used but not otherwise defined herein have the meanings ascribed to such terms in the Schedule 13D.
Item 2.Identity and Background
(b)
Item 2(b) is hereby amended to read as follows: Cable Car is an SEC registered investment adviser and serves as the general partner of the Fund.
Item 4.Purpose of Transaction
 
Item 4 is hereby amended to add the following: On April 2, 2026, the Reporting Persons delivered a letter to the Board of Directors of the Issuer setting forth a non-binding proposal (the "Proposal") to acquire all outstanding Shares not already owned by the Reporting Persons for $0.64 per share in cash. The foregoing description of the Proposal does not purport to be complete and is qualified in its entirety by reference to the Proposal, which is attached as Exhibit 99.1 hereto and is incorporated by reference herein.
Item 5.Interest in Securities of the Issuer
(a)
Item 5(a) is hereby amended and restated to read as follows: The aggregate percentage of Shares reported owned by the Reporting Persons is based on 11,698,919 Shares outstanding as of March 5, 2026, which is the total number of Shares outstanding as reported in the Issuer's Annual Report on Form 10-K filed with the Securities and Exchange Commission on March 12, 2026. As of the date hereof, the Fund beneficially owned 3,312,219 Shares, constituting approximately 28.3% of the Issuer's outstanding Shares. Cable Car, as the General Partner of the Fund, may be deemed the beneficial owner of the 3,312,219 Shares owned by the Fund. Mr. Ma-Weaver, as the Managing Member of Cable Car, may be deemed the beneficial owner of the 3,312,219 Shares owned by the Fund.
Item 6.Contracts, Arrangements, Understandings or Relationships With Respect to Securities of the Issuer
 
Item 6 is hereby amended to add the following: On April 2, 2026, the Reporting Persons submitted the Proposal defined and described in Item 4 above and attached as Exhibit 99.1 hereto.
Item 7.Material to be Filed as Exhibits.
 
Item 7 is hereby amended to add the following exhibit: 99.1 - Proposal, dated April 2, 2026.

    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.

 
Funicular Funds, LP
 Signature:/s/ Jacob Ma-Weaver
 Name/Title:Jacob Ma-Weaver, Managing Member
 Date:04/06/2026
 
Cable Car Capital, LP
 Signature:/s/ Jacob Ma-Weaver
 Name/Title:Jacob Ma-Weaver, Managing Member
 Date:04/06/2026
 
Ma-Weaver Jacob
 Signature:/s/ Jacob Ma-Weaver
 Name/Title:Jacob Ma-Weaver
 Date:04/06/2026