13D Filings
MapLight Therapeutics, Inc.
MPLT
Amendment
Ownership

49.90%

Total Shares

27,536,011

Issuer CIK

1770069

Event Date

Aug 13, 2026

Accepted

Aug 18, 2026, 06:51 PM

Reporting Persons (4)
Joint Filing

This is a joint filing. The reported shares may overlap between reporting persons and should not be summed.

NameType% of ClassAggregateSole VotingShared Voting
Catalyst4, Inc.
CO
49.90%27,536,01127,536,0110
Robert Brown
Individual
49.90%27,536,011027,536,011
Ekemini Riley
Individual
49.90%27,536,011027,536,011
Mark Vorsatz
Individual
49.90%27,536,011027,536,011
Disclosure Items (6)

Security Title

Common Stock, $0.0001 par value per share

Issuer Name

MapLight Therapeutics, Inc.

Issuer Address

800 Chesapeake Drive, Redwood City, CA, 94063

Item 3 of the Original Schedule 13D is amended as follows: The aggregate purchase price for the shares acquired in the PIPE Offering (as defined below) by the Reporting Persons was $83,400,153.82. The source of these funds was the working capital of Catalyst4.

Item 4 of the Original Schedule 13D is hereby amended as follows: On August 13, 2026, Catalyst entered into a securities purchase agreement, which is filed as Exhibit 99.4 to this Statement ("Securities Purchase Agreement") with the Issuer, pursuant to which the Catalyst agreed to purchase an aggregate of (i) 4,400,000 shares of the Issuer's voting common stock and (ii) accompanying pre-funded warrants to purchase up to 2,928,686 shares of voting common stock (the "Pre-Funded Warrants"), which is filed as Exhibit 99.5 to this Statement (the "PIPE Offering"). The purchase price per share of voting common stock is $11.38 per share (the "Purchase Price") and the purchase price for the Pre-Funded Warrants is the Purchase Price minus $0.0001 per share underlying the Pre-Funded Warrants. The PIPE Offering closed on August 14, 2026. The Pre-Funded Warrants are exercisable at any time and do not expire until exercised in full, however, the Pre-Funded Warrants may not be exercised if the aggregate number of shares of voting common stock beneficially owned by the Reporting Person immediately following such exercise would exceed 49.99%. Accordingly, only 2,229,322 of the Pre-Funded Warrants are included in the beneficial ownership reported by any of the Reporting Persons on their respective cover pages because they are exercisable within 60 days of August 14, 2026.

Item 5 of the Original Schedule 13D is amended as follows: (c) Except as previously reported on Amendment No. 1 filed with the Commission on August 3, 2026 and as set forth above in Item 4 (which is incorporated herein by reference), none of the Reporting Persons has effected any transactions of the Issuer's voting common stock during the 60 days preceding the date of this report, except as described in Item 4 and Item 6 of this Schedule 13D which information is incorporated herein by reference.

Item 6 of the Original Schedule 13D is hereby amended as follows: The information set forth in Items 3 and 4 of this Statement is incorporated herein by reference. In connection with its purchase of shares of the Issuer's voting common stock, Catalyst and certain of the Issuer's other investors entered into a Registration Rights Agreement (the "Registration Rights Agreement") with the Issuer. The terms and provisions of the Registration Rights Agreement are described more fully in the Issuer's Current Report on Form 8-K filed with the Commission on August 14, 2026, and the above summary is qualified by reference to such description and the full text of the Registration Rights Agreement, which is filed as Exhibit 99.6 and is incorporated herein by reference.

Exhibit 99.4 Form of Securities Purchase Agreement, dated August 13, 2026, by and among MapLight Therapeutics, Inc. and the Purchasers. (filed as Exhibit 10.1 to the Issuer's Current Report on Form 8-K as filed with the Commission on August 13, 2026 and incorporated herein by reference) Exhibit 99.5 Form of Pre-Funded Warrant. (filed as Exhibit 4.1 to the Issuer's Current Report on Form 8-K as filed with the Commission on August 13, 2026 and incorporated herein by reference) Exhibit 99.6 Form of Registration Rights Agreement, dated August 13, 2026, by and among MapLight Therapeutics, Inc. and the Purchasers. (filed as Exhibit 10.2 to the Issuer's Current Report on Form 8-K as filed with the Commission on August 13, 2026 and incorporated herein by reference)

MapLight Therapeutics, Inc. — Schedule 13D | 13D Filings