Korsana Biosciences, Inc.: 5%+ holders

Korsana Biosciences, Inc. has 10 Schedule 13D or 13G filings on record since 2025-08-14. 9 holders' latest filing reports 5% or more of common stock, no par value per share. Each figure below is the holder's own, as filed, with the filing linked.

Holders

Purpose of Transaction (Item 4)

Fairmount Funds Management LLC

The Reporting Persons own 19.99% of the Company in the aggregate, based upon the Company's aggregate outstanding shares as of September 8, 2026. The Reporting Persons' securities include (a) 2,691 shares of Common Stock issuable upon the exercise of options held directly by Mr. Kiselak that are currently exercisable or will be exercisable within 60 days of the date of this filing, (b) 6,911,174 shares of Common Stock directly held by Fund II and (c) 2,192,555 shares of Common Stock directly held by Co-Invest, and exclude (i) 2,074,000 shares of Common Stock issuable upon conversion of 2,074 shares of Series B Preferred Stock directly held by Fund II and (ii) 66,436 shares of Common Stock issuable upon exercise of Pre-Funded Warrants directly held by Fund II. The exercise of the Pre-Funded Warrants is subject to a beneficial ownership limitation of 19.99% of the outstanding shares of Common Stock and the conversion of the Series B Preferred Stock is subject to a beneficial ownership limitation of 19.99% of the outstanding shares of Common Stock. The securities exclude shares of Common Stock issuable upon exercise of Pre-Funded Warrants and conversion of Series B Preferred Stock in excess of such beneficial ownership limitations. At such time as Fairmount and its affiliates beneficially own 9.0% or less of the outstanding shares of Common Stock, the beneficial ownership limitation with respect to the Series B Preferred Stock will automatically reduce to 9.99%. Mr. Kiselak …The first part of Item 4 of the SCHEDULE 13D filed 2026-09-11; the filing has the rest

Venrock Healthcare Capital Partners III, L.P.

The Reporting Persons purchased the aforementioned securities for investment purposes with the aim of increasing the value of their investments and the Issuer. Subject to applicable legal requirements, one or more of the Reporting Persons may purchase additional securities of the Issuer from time to time in open market or private transactions, depending on its evaluation of the Issuer's business, prospects and financial condition, the market for the Issuer's securities, other developments concerning the Issuer, the reaction of the Issuer to the Reporting Persons' ownership of the Issuer's securities, other opportunities available to the Reporting Persons, and general economic, money market and stock market conditions. In addition, depending upon the factors referred to above, the Reporting Persons may dispose of all or a portion of their securities of the Issuer at any time (including by means of programs adopted pursuant to Rule 10b5-1 under the Securities Exchange Act of 1934 (the "Act")). Each of the Reporting Persons reserves the right to increase or decrease its holdings on such terms and at such times as each may decide. Except as set forth in this Item 4 and Item 6 below, none of the Reporting Persons has a present plan or proposal that relates to or would result in any of the actions specified in clauses (a) through (j) of Item 4 of Schedule 13D of the Act. However, each of the Reporting Persons reserves the right to propose or participate in future transactions …The first part of Item 4 of the SCHEDULE 13D filed 2026-09-15; the filing has the rest

Timeline

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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