Synlogic, Inc.: 5%+ holders

As of November 7, 2026, 3 holders' latest Schedule 13D or 13G filings report owning 5% or more of Synlogic, Inc. The largest reported stake is Funicular Funds, LP's, at 28.3%. 5 filings are on record since November 13, 2025 (Schedule 13D/A, July 29, 2026).

Baselake Partners, LP also filed stake reports on 7 other companies ↓

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Key facts

• Filing 2026-07-29 · Reporting person: Funicular Funds, LP · Sole voting: 3,312,219 · Shared voting: 0 · Sole dispositive: 3,312,219 · Shared dispositive: 0 · SCHEDULE 13D/A, 2026-07-29
• Filing 2026-07-29 · Reporting person: New Enterprise Associates 14, L.P. · Sole voting: 0 · Shared voting: 2,922,772 · Sole dispositive: 0 · Shared dispositive: 2,922,772 · SCHEDULE 13D/A, 2026-07-29
• Filed 2026-04-06 · Holder: Funicular Funds, LP · Percent: 28.3% · SCHEDULE 13D/A
• Filed 2026-01-23 · Holder: Baselake Partners, LP · Percent: 9.7% · SCHEDULE 13G
• Filed 2025-11-13 · Holder: Radoff Bradley Louis · Percent: 4.4% · SCHEDULE 13G/A

Synlogic, Inc. has 5 Schedule 13D or 13G filings on record since 2025-11-13. 3 holders' latest filing reports 5% or more of common stock, par value $0.001 per share. Each figure below is the holder's own, as filed, with the filing linked.

Holders

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More on Synlogic, Inc. and the records around it.

Companies that share a holder

• Baselake Partners, LP also filed stake reports on 7 other companies: KIORA PHARMACEUTICALS, INC. (Sep 2026), Passage Bio, Inc. (Jun 2026), Generation Bio Co. (Feb 2026)
• Funicular Funds, LP also filed stake reports on 10 other companies: AmpliTech Group, Inc. (Oct 2026), Rein Therapeutics, Inc. (May 2026), Pasithea Therapeutics Corp. (Apr 2026)
• Radoff Bradley Louis also filed stake reports on 11 other companies: Identiv, Inc. (Nov 2026), HARTE HANKS INC (Aug 2026), REGIONAL HEALTH PROPERTIES, INC (Aug 2026)

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Voting and dispositive power, as filed

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The latest filing identifies Synlogic, Inc. by CUSIP 87166L209 and gives its principal executive office as PO BOX 30, WINCHESTER, MA 01890 (SCHEDULE 13D/A, 2026-07-29).

Source of funds (Item 3)

Not applicable.New Enterprise Associates 14, L.P., SCHEDULE 13D/A, 2026-07-29

Purpose of Transaction (Item 4)

Funicular Funds, LP

Item 4 is hereby amended to add the following: On July 28, 2026, the Issuer entered into an Agreement and Plan of Merger (the "Merger Agreement") by and among the Issuer, Caldera Therapeutics, Inc., a Delaware corporation ("Caldera"), Sonic Holdco, Inc., a Delaware corporation ("Parent"), Yellowstone Merger Sub, Inc., a Delaware corporation and a direct, wholly owned subsidiary of Parent ("Caldera Merger Sub"), and Sonic Merger Sub, Inc., a Delaware corporation and a direct, wholly owned subsidiary of Parent ("Synlogic Merger Sub"). Pursuant to and subject to the terms of the Merger Agreement, among other things, the Issuer will be merged with and into Synlogic Merger Sub, with the Issuer surviving as a wholly owned subsidiary of Parent (the "Merger"), as more fully described in the Form 8-K filed by the Issuer with the Securities and Exchange Commission on July 29, 2026. Concurrently with the execution of the Merger Agreement, the Reporting Persons entered into a Support Agreement (the "Support Agreement") with Caldera and the Issuer. Under the terms of the Support Agreement, the Reporting Persons have agreed to vote all of their Shares in favor of the Merger and the adoption of the Merger Agreement and against any proposal made in opposition to, or in competition with, the Merger Agreement or the Merger. In addition, the Reporting Persons have agreed not to take certain actions, including (i) selling or transferring any Shares (subject to certain exceptions), (ii) …The first part of Item 4 of the SCHEDULE 13D/A filed 2026-07-29; the filing has the rest

New Enterprise Associates 14, L.P.

As previously disclosed by the Issuer, on July 28, 2026, the Issuer entered into an Agreement and Plan of Merger (the "Merger Agreement") by and among the Issuer, Caldera Therapeutics, Inc. ("Caldera"), Sonic Holdco, Inc. ("Parent"), Yellowstone Merger Sub, Inc., a direct, wholly owned subsidiary of Parent ("Caldera Merger Sub"), and Sonic Merger Sub, Inc., a direct, wholly owned subsidiary of Parent ("Synlogic Merger Sub"). Pursuant to the Merger Agreement, and upon the terms and subject to the satisfaction of the conditions described therein, the Issuer will be merged with and into Synlogic Merger Sub, with the Issuer surviving as a wholly owned subsidiary of Parent (the "Synlogic Merger"), and Caldera will be merged with and into Caldera Merger Sub, with Caldera surviving as a wholly owned subsidiary of Parent (the "Caldera Merger" and, together with the Synlogic Merger, the "Mergers"). Subject to the terms and conditions of the Merger Agreement, (a) at the effective time of the Caldera Merger (the "Caldera Effective Time") and following the conversion into shares of common stock of Caldera, $0.0001 par value per share ("Caldera Common Stock") of Caldera's (i) Series A Preferred Stock, $0.00001 par value per share, and (ii) Series A-1 Preferred Stock, $0.00001 par value per share, each then-outstanding share of Caldera Common Stock (excluding any shares of Caldera Common Stock held by stockholders who have exercised and perfected appraisal rights for such shares) will …The first part of Item 4 of the SCHEDULE 13D/A filed 2026-07-29; the filing has the rest

Timeline

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Questions about who owns Synlogic, Inc.

Who owns Synlogic, Inc.?

On this page, 3 holders' latest ownership filings report 5% or more of Synlogic, Inc.: Funicular Funds, LP (28.3%, Schedule 13D/A, filed 2026-07-29), New Enterprise Associates 14, L.P. (25%, Schedule 13D/A, filed 2026-07-29) and Baselake Partners, LP (9.7%, Schedule 13G, filed 2026-01-23).

Who are the largest shareholders of Synlogic, Inc.?

By the share each holder's latest filing reports, the largest holders of Synlogic, Inc. on this page are Funicular Funds, LP (28.3%), New Enterprise Associates 14, L.P. (25%) and Baselake Partners, LP (9.7%).

When did Funicular Funds, LP buy into Synlogic, Inc.?

The filings give report dates, not purchase dates. The earliest filing from Funicular Funds, LP on this page is the Schedule 13D/A, filed 2026-04-06, reporting 28.3%; its latest, Schedule 13D/A filed 2026-07-29, reports 28.3%. That earliest filing is itself an amendment, which updates an earlier report.

Is this an audit or a full list?

Neither. The ownership list on this page covers only Schedule 13D and 13G filings, which holders make once they own 5% or more of a class of shares (an amendment can report a stake that has since fallen below 5%); 5 such filings are shown here. It is not an audit and not a full cap table: holders who never reached 5% are not listed, and a stake can change after its latest filing.

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Where this comes from

Anyone who comes to own more than 5% of a class of a listed company's voting shares has to tell the SEC. A holder who may seek to change or influence the company files Schedule 13D, and has to say in Item 4, "Purpose of Transaction", what it intends to do. A holder with no such intent, such as many index and passive funds, may file the shorter Schedule 13G. Both are amended when the stake changes, including when it falls below 5%.

Every row here is one of those filings, linked to the filing itself. Percentages and share counts are exactly as the holder filed them, for the holder the filing names; an amendment showing a lower figure is shown as filed. Item 4 text is quoted word for word. Where a 13D's Item 4 contains a sentence stating a definite intent to influence the company, that sentence is marked and quoted; the page does not describe the holder or its motives beyond the words it filed. Nothing here is investment advice.

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