Catalyst4, Inc. - 30 Jul 2026 SCHEDULE 13D/A Report for MapLight Therapeutics, Inc. Common Stock, $0.0001 par value per share (MPLT)

Filing manager: Catalyst4, Inc.
Reporting owner: Catalyst4, Inc.
Security: MapLight Therapeutics, Inc. Common Stock, $0.0001 par value per share
Beneficially owned shares: 20,906,689 shares
Large-stake signal: Form
SCHEDULE 13D/A
Active or control-oriented beneficial ownership filing.
Ownership
48%
Beneficial ownership of this reported class.
Shares
20,906,689 shares
Shares beneficially owned as disclosed.
Event date
30 Jul 2026
Date tied to the ownership event or amendment.
Accepted by SEC
03 Aug 2026
EDGAR acceptance date.
How to read this large-stake filing
Schedule 13D/G filings focus on beneficial ownership stakes, not a full portfolio.
Compare this filing with the holder history and issuer page before treating the percentage as a current position.
Use amendments to understand whether the disclosed stake increased, decreased, or changed reporting status.
Class ownership: 48%
Symbol: MPLT
Shares outstanding: 43,646,532 shares
SEC form: SCHEDULE 13D/A
Accepted by SEC: 03 Aug 2026, 21:00:15 UTC
Event date: 30 Jul 2026
Prior SEC filing: 20 Nov 2025
Next SEC filing: 18 Aug 2026
Source filing: View source filing

Key filing fact

Catalyst4, Inc. disclosed 48% ownership in MapLight Therapeutics, Inc. Common Stock, $0.0001 par value per share (MPLT) on 30 Jul 2026.

Key facts

Catalyst4, Inc. filed SCHEDULE 13D/A for MapLight Therapeutics, Inc. Common Stock, $0.0001 par value per share (MPLT).
Disclosed ownership: 48%.
Date of event: 30 Jul 2026.

This page turns one Schedule 13D/G filing into a quick large-stake read before the raw reporting-person rows.
Use the linked SEC filing as the source of truth for ownership percentages, shares, and reporting-party details.

Backed by Schedule 13D/13G

Beneficial ownership values are sourced from the original SEC Schedule 13D/13G filing.

Reporting persons

Names, ownership percentages, voting power, signatures, titles, and CIKs as disclosed in this Schedule 13D/G filing.

Name	Ownership	Shares owned	Sole voting power	Shared voting power	Signature	Title	CIK
Catalyst4, Inc.	48%	20,906,689	20,906,689	0	/s/ Robert Brown	Robert Brown, President	0001900201
Robert Brown	48%	20,906,689	0	20,906,689	/s/ Robert Brown	Robert Brown
Ekemini Riley	48%	20,906,689	0	20,906,689	/s/ Ekemini Riley	Ekemini Riley
Mark Vorsatz	48%	20,906,689	0	20,906,689	/s/ Mark Vorsatz	Mark Vorsatz

CIK / CUSIP context first

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