MEDICINOVA INC

On May 7, 2024, we entered into a consulting agreement (the “Consulting Agreement”) with Geoffrey O’Brien, effective April 2, 2024 (the “Effective Date”) in connection with his retirement from full-time employment in April 2024. In consideration for the services Mr. O’Brien will provide under the Consulting Agreement, Mr. O’Brien will be paid a market rate per hour for any services provided. Any outstanding options that were vested and exercisable as of the Effective Date will remain exercisable pursuant to their original terms while he continues to provide services to the Company under the Consulting Agreement. Any outstanding options that were not vested and exercisable as of the Effective Date were forfeited and cancelled as of the Effective Date. The Consulting Agreement also contains additional customary provisions regarding confidentiality and invention assignment among other matters.

The foregoing description of the Consulting Agreement does not purport to be complete and is qualified in its entirety by reference to the Consulting Agreement, a copy of which will be filed as an exhibit to our Quarterly Report on Form 10-Q for the period ending June 30, 2024.

Securities Trading Plans of Directors and Executive Officers

During the quarter ended March 31, 2024, none of our officers or directors, as defined in Rule 16a-1(f), informed us of theadoption ortermination of a Rule 10b5-1 trading arrangement or a non-Rule 10b5-1 trading arrangement, each as defined in Regulation S-K Item 408.