MapLight CMO sells 4,438 shares in 10b5-1 plan

MapLight Therapeutics, Inc. Chief Medical Officer Erin Pennock Foff reported open-market sales of a total of 4,438 shares of Voting Common Stock on May 7, 2026.

Rhea-AI Filing Summary

MapLight Therapeutics, Inc. Chief Medical Officer Erin Pennock Foff reported open-market sales of a total of 4,438 shares of Voting Common Stock on May 7, 2026. The trades, executed at weighted average prices around $28–$29 per share, were made pursuant to a pre-arranged Rule 10b5-1 trading plan adopted on December 29, 2025, indicating they were scheduled in advance rather than timed discretionarily.

Insider Trade Summary 10b5-1

Net Seller: 4,438 shares

Net Sell 2 txns

Insider Foff Erin Pennock

Role Chief Medical Officer

Sold 4,438 shs ($127K)

Type	Security	Shares	Price	Value
Sale	Voting Common Stock	4,321	$28.52	$123K
Sale	Voting Common Stock	117	$29.10	$3K

Holdings After Transaction: Voting Common Stock — 346,059 shares (Direct)

Footnotes (3)

1. F1. This transaction was made pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on December 29, 2025.
2. F2. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $28.08 to $29.045 inclusive. The Reporting Person undertakes to provide to 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 sold at each separate price within the range set forth in this footnote.
3. F3. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $29.09 to $29.10 inclusive. The Reporting Person undertakes to provide to 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 sold at each separate price within the range set forth in this footnote.

Key Figures

Total shares sold: 4,438 shares First sale size: 4,321 shares First sale price: $28.52 per share +4 more

7 metrics

Total shares sold 4,438 shares Open-market sales on May 7, 2026

First sale size 4,321 shares Voting Common Stock, open-market sale

First sale price $28.52 per share Weighted average price for 4,321-share sale

Second sale size 117 shares Voting Common Stock, open-market sale

Second sale price $29.10 per share Weighted average price for 117-share sale

Net share change 4,438 shares Net-sell direction per transaction summary

10b5-1 plan adoption date December 29, 2025 Date plan governing the sales was adopted

Key Terms

Rule 10b5-1 trading plan, Voting Common Stock, weighted average price, open-market sale, +1 more

5 terms

Rule 10b5-1 trading plan regulatory

"This transaction was made pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on December 29, 2025."

A Rule 10b5-1 trading plan is a pre-arranged schedule that allows company insiders to buy or sell stock at specific times, even if they have inside information. It helps prevent accusations of unfair trading by making these transactions look planned and transparent, rather than sneaky or illegal.

Voting Common Stock financial

"security_title": "Voting Common Stock""

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.

open-market sale financial

"transaction_action": "open-market sale""

An open-market sale is when a shareholder sells existing shares directly on a public exchange to any willing buyer, rather than through a private deal. Think of it like putting goods on a busy market stall where price is set by supply and demand; for investors it matters because such sales increase available supply, can put short-term downward pressure on the stock price, and signal changes in liquidity or investor confidence.

Form 4 regulatory

"INSIDER FILING DATA (Form 4):"

Form 4 is a official document that company insiders, such as executives or major shareholders, file with regulators whenever they buy or sell company shares. It provides transparency about how those with inside knowledge are trading, helping investors see if insiders are confident in the company's prospects or may be selling for personal reasons. This information can influence investor decisions by revealing insiders' perspectives on the company's value.

FAQ

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

What did MapLight Therapeutics (MPLT) disclose in this Form 4?

MapLight Therapeutics reported that Chief Medical Officer Erin Pennock Foff sold 4,438 shares of Voting Common Stock in open-market transactions on May 7, 2026 under a Rule 10b5-1 trading plan.

How many MapLight Therapeutics (MPLT) shares did the CMO sell?

Chief Medical Officer Erin Pennock Foff sold a total of 4,438 shares of MapLight Therapeutics Voting Common Stock across two open-market transactions reported in this Form 4 filing.

At what prices were the MapLight Therapeutics (MPLT) shares sold?

Erin Pennock Foff’s reported sales were executed at weighted average prices of $28.52 and $29.10 per share, with actual trade prices ranging between $28.08 and $29.10 as described in the footnotes.

Was the MapLight Therapeutics (MPLT) insider sale pre-planned?

Yes. The filing states the transactions were made pursuant to a Rule 10b5-1 trading plan adopted by Erin Pennock Foff on December 29, 2025, indicating the sales were scheduled in advance.

Who is the reporting person in the MapLight Therapeutics (MPLT) Form 4?

The reporting person is Erin Pennock Foff, who serves as Chief Medical Officer of MapLight Therapeutics, Inc., and reported the open-market sales of Voting Common Stock in this Form 4.

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

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Accepted by SEC EDGAR 05/11/2026 - 09:30 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).

X

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^*

Foff Erin Pennock

(Last) (First) (Middle)

C/O MAPLIGHT THERAPEUTICS, INC.

800 CHESAPEAKE DRIVE

(Street)

REDWOOD CITY CALIFORNIA 94063

(City) (State) (Zip)

UNITED STATES

(Country)

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

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

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
05/07/2026

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	05/07/2026		S(1)		4,321	D	$28.52(2)	346,176	D
Voting Common Stock	05/07/2026		S(1)		117	D	$29.1(3)	346,059	D

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. This transaction was made pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on December 29, 2025.

2. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $28.08 to $29.045 inclusive. The Reporting Person undertakes to provide to 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 sold at each separate price within the range set forth in this footnote.

3. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $29.09 to $29.10 inclusive. The Reporting Person undertakes to provide to 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 sold at each separate price within the range set forth in this footnote.

	/s/ Kristopher L. Hanson, Attorney-in-Fact	05/11/2026
	** 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)