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SCHEDULE 13D Filed 2026-07-02 Event 2026-06-25 SEC 0000902664-26-003000 →

Lynx1 Capital Management LP Passage BIO, Inc. PASG

Stake: 21.00% Shares: 673,759 CUSIP: 702712100 Class: Common Stock, par value $0.0001 per share

Item 4 — Purpose of Transaction

The Reporting Persons originally acquired the securities reported herein because they believe the securities are undervalued and represent an attractive investment opportunity and they continue to hold the shares of Common Stock reported herein for investment purposes. The Reporting Persons previously reported their beneficial ownership on Schedule 13G pursuant to Rule 13d-1(c) under the Act. As a result of the acquisition of additional shares of Common Stock described in Items 3 and 5(c), the Reporting Persons' aggregate beneficial ownership has equaled or exceeded 20% of the outstanding Common Stock. Accordingly, the Reporting Persons are no longer eligible to report on Schedule 13G under Rule 13d-1(c)(3) and are filing this Schedule 13D pursuant to Rule 13d-1(f)(1). On June 24, 2026, the Issuer, Peregrine Merger Sub, Inc., a Delaware corporation and a direct, wholly owned subsidiary of the Issuer ("Merger Sub"), and Remix Therapeutics, Inc., a Delaware corporation ("Remix") entered into an Agreement and Plan of Merger (the "Merger Agreement") substantially in the form attached as Exhibit 99.2 to this Schedule 13D, pursuant to which Merger Sub will merge with and into Remix, with Remix surviving the merger and becoming a wholly owned subsidiary of the Issuer (the "Merger"). Following the Merger, the combined company is expected to be renamed "Remix Therapeutics, Inc." and to trade on Nasdaq under the symbol "RMTX." In connection with the Merger, the Lynx1 Fund has agreed to participate in a financing (the "Concurrent Financing") in which it will (i) purchase shares of Remix common stock pursuant to a subscription agreement (the "Subscription Agreement") substantially in the form attached as Exhibit 99.3 to this Schedule 13D and (ii) purchase convertible notes pursuant to a convertible promissory note purchase agreement. The consummation of the Concurrent Financing is conditioned on the satisfaction or waiver of certain conditions to the Merger. In addition, in connection with the Concurrent Financing, an affiliate of the Investment Manager will enter in to a registration rights agreement (the "Registration Rights Agreement") with the Issuer and Remix, substantially in the form attached as Exhibit 99.4 to this Schedule 13D, providing for the registration for resale of the shares of Common Stock issuable in respect of the securities purchased in the Concurrent Financing. In addition, the Issuer and a third party rights agent will enter into a Contingent Value Rights Agreement (the "CVR Agreement") substantially in the form attached as Exhibit 99.5 to this Schedule 13D, pursuant to which the Issuer's common stockholders of record will receive one contingent value right for each outstanding share of Common Stock held by such stockholder. As a result of the foregoing, the Reporting Persons expect to acquire additional shares of Common Stock at the effective time of the Merger in respect of the Remix securities they have agreed to purchase in the Concurrent Financing. The Reporting Persons do not presently beneficially own such shares of Common Stock, the issuance of which is contingent on the consummation of the Merger. In addition, as a holder of record of Common Stock, the Reporting Persons will be entitled to receive one contingent value right for each share of Common Stock held as of the close of business on the last business day prior to the Effective Time, pursuant to a Contingent Value Rights Agreement to be entered into by the Issuer as described in the Issuer's filings. The foregoing summaries of the Merger Agreement, the Subscription Agreement, the Registration Rights Agreement and the CVR Agreement are qualified in their entireties by reference to the full texts of such agreements, the forms of which are included as Exhibit 99.2, Exhibit 99.3, Exhibit 99.4 and Exhibit 99.5, respectively, hereto and are incorporated by reference herein. The Reporting Persons may engage in discussions with management, the board of directors (the "Board"), other stockholders of the Issuer, and other persons regarding the Issuer, including with respect to its business, operations, strategy, capital structure, and governance, and the Merger, though the Reporting Persons may change its intentions with respect to any and all of the foregoing. The Reporting Persons may also take steps to explore and prepare for various plans and actions, and propose transactions, before forming an intention to engage in such plans or actions or proceed with such transactions. The Reporting Persons intend to review their investment in the Issuer on a continuing basis and depending upon various factors, including without limitation, the Issuer's financial position and strategic direction, the outcome of any discussions referenced above, overall market conditions, other investment opportunities available to the Reporting Persons, and the availability of securities of the Issuer at prices that would make the purchase or sale of such securities

Cross-References

Insider Activity (last 365d)
9 transactions
5 buys · 2 sales · 2 awards/exercises
Issuer Cluster
5 13D/G filings on this issuer
4 other filings besides this one
Filer Track Record
3 filings by this filer
2 other filings in the data moat
Short Interest · settle 2026-07-31
DTC 4.52
155,837 shares short · +25.0% vs prior

Post-Filing Returns · since 2026-06-25 on PASG

+1 day
0.0%
+5 days
0.0%
+30 days
-7.6%
+60 days
+90 days
+180 days

Anchor price 5.00 on closest trading day on/after 2026-06-25. Source: Yahoo Finance daily adj_close (split + dividend adjusted).

Form 4 Insider Transactions · last 365d

DateInsiderRoleTypeSharesPriceValue
2026-03-16 Borthwick Kathleen officer Award 15,610 $7.64 $119K
2026-03-16 Chou William director, officer Award 58,000 $7.64 $443K
2026-01-08 Chou William director, officer Option exercise 10,000
2026-01-08 Borthwick Kathleen officer Option exercise 5,000
2026-01-08 Chou William director, officer Sale 4,076 $18.44 $75K
2026-01-08 Borthwick Kathleen officer Sale 2,062 $18.44 $38K
2025-09-15 Lynx1 Capital Management LP 10%+ owner Buy 11,900 $6.99 $83K
2025-09-12 Lynx1 Capital Management LP 10%+ owner Buy 19,783 $6.99 $138K
2025-09-11 Lynx1 Capital Management LP 10%+ owner Buy 325 $6.96 $2K

Other 13D/G Filings on Passage BIO, Inc.

FiledFormFilerStakeShares
2026-06-25 SCHEDULE 13G Baselake Partners, LP view →
2025-07-21 SCHEDULE ORBIMED ADVISORS LLC 7.82% 243,878 view →
2024-04-12 SC ORBIMED ADVISORS LLC view →
2021-01-27 SC Frazier Life Sciences IX, L.P. view →

Other Filings by Lynx1 Capital Management LP

FiledFormIssuerStakeShares
2026-07-20 SCHEDULE 13G PRECISION BIOSCIENCES INC view →
2025-12-29 SCHEDULE Neuphoria Therapeutics Inc. NEUP 16.30% 875,328 view →

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