Catalyst4 buys 7.3M MapLight shares, warrants

MapLight Therapeutics, Inc. (MPLT) reported that 10% owner Catalyst4, Inc. purchased 4,400,000 shares of Voting Common Stock and warrants for 2,928,686 shares on August 14, 2026 at around $11.38 per share.

Rhea-AI Filing Summary

MapLight Therapeutics, Inc. (MPLT) reported that 10% owner Catalyst4, Inc. purchased 4,400,000 shares of Voting Common Stock and warrants for 2,928,686 shares on August 14, 2026 at around $11.38 per share. The warrants are immediately exercisable at $0.0001 per share but include a 49.99% beneficial ownership cap and do not expire until exercised in full. After these purchases, Catalyst4 indirectly holds 25,306,689 shares of Voting Common Stock, with voting and dispositive power shared by its directors, who each disclaim beneficial ownership.

Insider Trade Summary

Net Buyer: 7,328,686 shares

Net Buy 2 txns

Insider Catalyst4, Inc.

Role 10% Owner

Bought 7,328,686 shs ($83.40M)

Type	Security	Shares	Price	Value
Purchase	Warrants (right to buy) F2, F3, F1	2,928,686	$11.3799	$33.33M
Purchase	Voting Common Stock F1	4,400,000	$11.38	$50.07M

Holdings After Transaction: Warrants (right to buy) — 2,928,686 contracts (Indirect, See footnote); Voting Common Stock — 25,306,689 shares (Indirect, See footnote)

Footnotes (3)

1. F1. The shares are held of record by Catalyst4, Inc. ("Catalyst4"). As the members of the board of directors of Catalyst4, Robert Brown, Ekemini Riley and Mark Vorsatz share voting and dispositive power with respect to the shares held by Catalyst4. Each of Mr. Brown, Ms. Riley and Mr. Vorsatz disclaims beneficial ownership of the shares reported herein.
2. F2. The warrant is immediately exercisable, however, the warrant 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%.
3. F3. The warrants will not expire until exercised in full.

Key Figures

Common shares purchased: 4,400,000 shares Warrants purchased: 2,928,686 warrants Common stock purchase price: $11.3800 per share +5 more

8 metrics

Common shares purchased 4,400,000 shares Voting Common Stock purchased on August 14, 2026

Warrants purchased 2,928,686 warrants Warrants to buy Voting Common Stock purchased on August 14, 2026

Common stock purchase price $11.3800 per share Price for Voting Common Stock purchased on August 14, 2026

Warrant purchase price reference $11.3799 per warrant share Per-share value reported for warrants on August 14, 2026

Warrant exercise price $0.0001 per share Exercise price for warrants to buy Voting Common Stock

Shares held after transaction 25,306,689 shares Voting Common Stock indirectly held by Catalyst4 after purchases

Beneficial ownership cap 49.99% Maximum beneficial ownership allowed immediately after warrant exercise

Total net shares bought 7,328,686 shares Sum of common shares and warrant-underlying shares purchased

Key Terms

beneficial ownership, dispositive power, warrants, immediately exercisable, +1 more

5 terms

beneficial ownership financial

"the aggregate number of shares of voting common stock beneficially owned"

Beneficial ownership means the person or entity that actually enjoys the benefits of owning shares or other assets — such as receiving dividends, voting rights, or price gains — even if the legal title is held in another name. For investors it matters because knowing who truly controls and profits from a company reveals who can influence decisions, exposes potential conflicts of interest or hidden concentration of power, and affects transparency and risk in the stock.

dispositive power financial

"share voting and dispositive power with respect to the shares held"

Dispositive power is the authority to decide the final outcome of an asset, legal claim, contract, or corporate action — in effect the power to dispose of or resolve something. For investors it matters because whoever holds that authority can determine who gets paid, who controls an asset or vote, and how risks and returns are allocated; think of it like holding the key that lets you lock in the winner or loser in a deal.

warrants financial

"The warrants will not expire until exercised in full."

Warrants are special documents that give you the right to buy a company's stock at a set price before a certain date. They are often used as a way for companies to attract investors or raise money, and their value can increase if the company's stock price goes up.

immediately exercisable financial

"The warrant is immediately exercisable, however, the warrant may not be exercised"

voting common stock financial

"shares of voting common stock beneficially owned by the reporting person"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider transactions were reported for MPLT by Catalyst4, Inc. on August 14, 2026?

Catalyst4, Inc. reported buying 4,400,000 MPLT Voting Common shares and warrants for 2,928,686 shares on August 14, 2026, in open-market or private purchases at about $11.38 per share.

How many MapLight Therapeutics (MPLT) shares does Catalyst4, Inc. hold after these trades?

After the reported purchases, Catalyst4, Inc. indirectly holds 25,306,689 shares of MPLT Voting Common Stock. Voting and dispositive power over these shares is shared by Catalyst4’s directors, who each disclaim beneficial ownership.

What are the key terms of the MPLT warrants acquired by Catalyst4, Inc.?

Catalyst4 acquired warrants for 2,928,686 MPLT shares, immediately exercisable at $0.0001 per share. Exercise is limited by a 49.99% beneficial ownership cap, and the warrants do not expire until fully exercised.

At what price did Catalyst4, Inc. purchase MPLT common stock and warrants?

Catalyst4 purchased MPLT Voting Common Stock at $11.3800 per share and warrants at a per-share value of $11.3799. These prices reflect open-market or private purchase transactions as reported in the Form 4.

Is the 10b5-1 trading plan box checked for this MPLT Form 4 filing?

No. The Form 4 for MPLT indicates the Rule 10b5-1 checkbox is not checked, meaning the reported purchases by Catalyst4, Inc. are not affirmed as being made under a Rule 10b5-1 trading plan.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 08/18/2026 - 06:56 PM Accepted by SEC EDGAR 08/18/2026 - 06:55 PM Learn about SEC filing dates

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Catalyst4, Inc.

(Last) (First) (Middle)

555 BRYANT STREET #376

(Street)

PALO ALTO CALIFORNIA 94301

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
MapLight Therapeutics, Inc. [ MLPT ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director	X	10% Owner
	Officer (give title below)		Other (specify below)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
08/14/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Voting Common Stock	08/14/2026		P		4,400,000	A	$11.38	25,306,689	I	See footnote(1)

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Warrants (right to buy)	$0.0001	08/14/2026		P		2,928,686		(2)	(3)	Voting Common Stock	2,928,686	$11.3799	2,928,686	I	See footnote(1)

Explanation of Responses:

1. The shares are held of record by Catalyst4, Inc. ("Catalyst4"). As the members of the board of directors of Catalyst4, Robert Brown, Ekemini Riley and Mark Vorsatz share voting and dispositive power with respect to the shares held by Catalyst4. Each of Mr. Brown, Ms. Riley and Mr. Vorsatz disclaims beneficial ownership of the shares reported herein.

2. The warrant is immediately exercisable, however, the warrant 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%.

3. The warrants will not expire until exercised in full.

	/s/ Robert Brown	08/18/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)