MapLight Therapeutics: Catalyst4 buys 1,209,225 shares

Catalyst4, Inc., reported as a 10% owner of MapLight Therapeutics, Inc., purchased a total of 1,209,225 shares of Voting Common Stock in open market or private transactions from July 28–30, 2026.

Rhea-AI Filing Summary

Catalyst4, Inc., reported as a 10% owner of MapLight Therapeutics, Inc., purchased a total of 1,209,225 shares of Voting Common Stock in open market or private transactions from July 28–30, 2026. The purchases included 1,000,000 shares at $13.0000 per share and additional shares at $12.6300 and weighted-average prices within ranges of $10.295–$11.28 and $11.31–$12.00 per share. The shares are held of record by Catalyst4, whose board members share voting and dispositive power and each disclaims beneficial ownership; the trades were not marked as made under a Rule 10b5-1 trading plan.

Insider Trade Summary

Net Buyer: 1,209,225 shares

Net Buy 4 txns

Insider Catalyst4, Inc.

Role 10% Owner

Bought 1,209,225 shs ($15.31M)

Type	Security	Shares	Price	Value
Purchase	Voting Common Stock F2	1,000,000	$13.00	$13.00M
Purchase	Voting Common Stock F2	3,000	$12.63	$38K
Purchase	Voting Common Stock F1, F2	141,088	$10.7416	$1.52M
Purchase	Voting Common Stock F3, F2	65,137	$11.6891	$761K

Holdings After Transaction: Voting Common Stock — 20,906,689 shares (Indirect, See footnote)

Footnotes (3)

1. F1. The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $10.295 to $11.28, inclusive. The reporting person undertakes to provide the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the ranges set forth in footnotes (1) and (3) to this Form 4.
2. F2. 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.
3. F3. The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $11.31 to $12.00, inclusive.

Key Figures

Total shares purchased: 1,209,225 shares Largest single purchase: 1,000,000 shares at $13.0000 per share Additional purchase: 3,000 shares at $12.6300 per share +2 more

5 metrics

Total shares purchased 1,209,225 shares Aggregate Voting Common Stock purchases reported across four transactions

Largest single purchase 1,000,000 shares at $13.0000 per share Voting Common Stock purchased on 2026-07-30

Additional purchase 3,000 shares at $12.6300 per share Voting Common Stock purchased on 2026-07-29

Weighted-average purchase 1 $10.7416 per share; $10.295 to $11.28 range Multiple 2026-07-28 purchases described in footnote (1)

Weighted-average purchase 2 $11.6891 per share; $11.31 to $12.00 range Multiple 2026-07-28 purchases described in footnote (3)

Key Terms

weighted average price, voting and dispositive power, disclaims beneficial ownership

3 terms

weighted average price financial

"The price reported in Column 4 is a weighted average price."

Weighted average price is the average price of a security where each trade or component is counted according to its size, so bigger trades pull the average more than smaller ones. Think of it like calculating the average cost of a grocery haul where items you bought more of have greater influence on the final per-item cost. Investors use it to understand the true average price paid or received, judge execution quality, and compare trading performance against market movement.

voting and dispositive power regulatory

"board of directors of Catalyst4 ... share voting and dispositive power"

disclaims beneficial ownership regulatory

"Each of Mr. Brown, Ms. Riley and Mr. Vorsatz disclaims beneficial ownership"

FAQ

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

What insider activity did Catalyst4 report in MapLight Therapeutics (MPLT) stock?

Catalyst4, Inc. reported purchasing 1,209,225 shares of MapLight Therapeutics Voting Common Stock from July 28–30, 2026 in open market or private transactions, according to a Form 4 insider trading report.

How many MapLight Therapeutics (MPLT) shares did Catalyst4 buy on July 30, 2026?

On July 30, 2026, Catalyst4 purchased 1,000,000 shares of MapLight Therapeutics Voting Common Stock at a price of $13.0000 per share, representing the largest single transaction disclosed in the Form 4.

At what prices were the July 28, 2026 MPLT share purchases executed?

On July 28, 2026, Catalyst4 bought shares at weighted-average prices of $10.7416 and $11.6891 per share, across multiple trades within price ranges of $10.295–$11.28 and $11.31–$12.00, as described in the Form 4 footnotes.

Were Catalyst4’s MPLT trades made under a Rule 10b5-1 trading plan?

The Form 4 indicates the Rule 10b5-1 checkbox is not selected, so these Catalyst4 trades in MapLight Therapeutics stock are not designated as being made under a Rule 10b5-1 trading plan.

Who has voting power over the MPLT shares held by Catalyst4?

The shares are held of record by Catalyst4, Inc.. Its directors Robert Brown, Ekemini Riley and Mark Vorsatz share voting and dispositive power over these shares, and each disclaims beneficial ownership, according to the Form 4 footnote.

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

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Available on EDGAR 07/30/2026 - 06:39 PM Accepted by SEC EDGAR 07/30/2026 - 06:39 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)
07/28/2026

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	07/28/2026		P		141,088	A	$10.7416(1)	19,838,552	I	See footnote(2)
Voting Common Stock	07/28/2026		P		65,137	A	$11.6891(3)	19,903,689	I	See footnote(2)
Voting Common Stock	07/29/2026		P		3,000	A	$12.63	19,906,689	I	See footnote(2)
Voting Common Stock	07/30/2026		P		1,000,000	A	$13	20,906,689	I	See footnote(2)

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

Explanation of Responses:

1. The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $10.295 to $11.28, inclusive. The reporting person undertakes to provide the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the ranges set forth in footnotes (1) and (3) to this Form 4.

2. 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.

3. The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $11.31 to $12.00, inclusive.

	/s/ Robert Brown	07/30/2026
	** 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)