Vanguard Capital Management and Vanguard Morningstar Total Stock Market Index Fund filed a Schedule 13G with the SEC on October 30, 2026, disclosing beneficial ownership of MediciNova Inc common stock as of September 30, 2026.

Key Highlights

  • Total beneficial ownership: Vanguard Capital Management reported aggregate beneficial ownership of 3,548,731 shares of MediciNova common stock, representing 7.20% of the class.
  • Sole voting power: Vanguard Capital Management holds sole voting power over 311,803 shares.
  • Sole dispositive power: Vanguard Capital Management holds sole dispositive power over 3,548,731 shares, with no shared dispositive power reported.
  • Fund-level stake: The Vanguard Morningstar Total Stock Market Index Fund separately reported beneficial ownership of 2,644,974 shares, representing 5.37% of the class, with sole voting power over all 2,644,974 shares.
  • Triggering date: The event requiring this filing occurred on September 30, 2026.
  • Ordinary course certification: Both reporting persons certified the securities "were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer."

Vanguard Discloses Ownership Position in MediciNova as of September 30, 2026

According to the Schedule 13G filing, Vanguard Capital Management, organized in Pennsylvania and classified as an investment adviser, reported aggregate beneficial ownership of 3,548,731 shares of MediciNova Inc (CUSIP 58468P206) common stock. This represents 7.20% of the outstanding class. The filing was signed by My Trieu-Gatt, identified as Authorized Signatory and Head of Global Fund Administration, on October 30, 2026.

The filing notes that the reported position reflects securities beneficially owned by Vanguard Capital Management LLC and affiliated entities, including Vanguard Asset Management Limited, Vanguard Fiduciary Trust Company, Vanguard Global Advisers, LLC, and Vanguard Investments Australia Ltd. The filing states it covers securities held by Vanguard funds or sleeves thereof over which Vanguard Capital Management LLC exercises dispositive power, as well as securities held by clients over which the named affiliates exercise dispositive and/or voting power. The filing explicitly states it does not include securities beneficially owned by other subsidiaries or affiliates whose ownership is disaggregated under SEC Release No. 34-39538.

A separate reporting person listed in the same filing, the Vanguard Morningstar Total Stock Market Index Fund, a Delaware entity, reported 2,644,974 shares with sole voting power and 5.37% of the class. The filing states that the fund's interest in the securities reported exceeds 5%. My Trieu-Gatt also signed on behalf of the fund in the capacity of Authorized Signatory and Treasurer. MediciNova Inc's principal executive offices are listed at 4275 Executive Square, Suite 300, La Jolla, CA, 92037.

What Was Disclosed

Vanguard Capital Management and the Vanguard Morningstar Total Stock Market Index Fund jointly filed a Schedule 13G disclosing combined beneficial ownership positions in MediciNova Inc common stock as of September 30, 2026, with Vanguard Capital Management reporting 7.20% of the class.