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Disclosery

MACI MELAR ACQUISITION CORP. I

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SHS CL A (common), issuer CIK 2016221

38 managers (38 13F filers) reported a position in MACI shares at 2025-12-31, 16,088,355 shares in all. 3 filers opened a position and 3 filers sold out during the quarter.

Managers
38
13F filers
38
New
3
Added
5
Reduced
10
Sold out
3
Shares held by filers
16,088,355

Shares held by filers adds up every 13F filer's report, so a share reported by a parent and by its subsidiary counts twice (H9). Managers counts each filer group once.

13D and 13G filers

No 13D or 13G on this security in the data. Structured 13D/G data starts 2024-12-18.

Insider trades

No Form 4 transaction on this security in the data.

13F holders, Q4 2025

Filers in the available 13F reports with a share position at 2025-12-31, filer groups collapsed to one row (method), largest first. Options and principal amounts are left out. A group row states no % of portfolio, since each member reports its own portfolio: the members' percents are listed under it. A value about 1,000 times or 1/1,000 of the price other filers imply is shown as filed but neither ranks the row nor enters a sum.

HolderSharesValue% of portfolioChangeSource
Polar Asset Management Partners Inc.1,485,000$15.8M0.31%013F-HRTimeline
LMR Partners LLPin group LMR Partners LLP1,485,000$15.8M0.15%013F-HRTimelineGroup
First Trust Capital Management L.P.in group FIRST TRUST ADVISORS LP1,400,000$14.9M0.9%013F-HRTimelineGroup
Karpus Management, Inc.1,145,155$12.2M0.37%-1,50013F-HR/ATimeline
WOLVERINE ASSET MANAGEMENT LLCin group WOLVERINE ASSET MANAGEMENT LLC1,028,689$10.9M0.16%+102,36113F-HRTimelineGroup
MIZUHO SECURITIES USA LLCin group MIZUHO FINANCIAL GROUP INC1,027,274$10.8M0.18%+135,97013F-HRTimelineGroup
AQR Arbitrage LLCin group AQR CAPITAL MANAGEMENT LLC997,179$10.6M0.22%013F-HRTimelineGroup
BERKLEY W R CORP868,489$9.23M0.52%+222,66913F-HRTimeline
D. E. Shaw & Co., Inc.in group D. E. Shaw & Co., Inc.576,328$6.13M<0.01%013F-HRTimelineGroup
GLAZER CAPITAL, LLCin group GLAZER CAPITAL, LLC556,278$5.91M0.16%-9613F-HRTimelineGroup
Cable Car Capital, LP492,500$5.24M0.33%013F-HRTimeline
Wealthspring Capital LLCin group Wealthspring Capital LLC455,716$4.84M1.14%-3,20913F-HRTimelineGroup
Radcliffe Capital Management, L.P.426,939$4.54M0.25%013F-HRTimeline
Westchester Capital Management, LLCin group Westchester Capital Managemen…424,707$4.51M0.21%013F-HRTimelineGroup
Magnetar Financial LLCin group Magnetar Financial LLC371,250$3.95M0.04%013F-HRTimelineGroup
L1 Global Manager Pty Ltd335,000$3.56M2.33%13F-HRTimeline
Hudson Bay Capital Management LPin group Hudson Bay Capital Management…325,000$3.45M0.02%013F-HRTimelineGroup
Alberta Investment Management Corp325,000$3.45M0.02%013F-HR/ATimeline
PICTON MAHONEY ASSET MANAGEMENT325,000$3.45M0.04%013F-HRTimeline
GOLDMAN SACHS GROUP INCin group GOLDMAN SACHS GROUP INC299,331$3.18M<0.01%013F-HR/ATimelineGroup
RIVERNORTH CAPITAL MANAGEMENT, LLC299,140$3.18M0.15%-40713F-HRTimeline
TWO SIGMA INVESTMENTS, LPin group TWO SIGMA INVESTMENTS, LP218,703$2.32M<0.01%-156,29713F-HRTimelineGroup
Crossingbridge Advisors, LLC211,535$2.24M0.63%new13F-HRTimeline
RiverPark Advisors, LLCin group RiverPark Advisors, LLC186,535$1.98M0.57%new13F-HRTimelineGroup
Periscope Capital Inc.183,612$1.95M0.38%-51,80013F-HRTimeline
HGC Investment Management Inc.175,000$1.86M0.39%013F-HRTimeline
TORONTO DOMINION BANKin group TORONTO DOMINION BANK133,198$1.42M<0.01%+13,15813F-HRTimelineGroup
DELTEC ASSET MANAGEMENT LLC100,000$1.06M0.18%013F-HRTimeline
MOORE CAPITAL MANAGEMENT, LP75,000$797K0.02%013F-HRTimeline
HEIGHTS CAPITAL MANAGEMENT, INCin group HEIGHTS CAPITAL MANAGEMENT, I…52,161$554K0.21%-12,20513F-HRTimelineGroup
Dakota Wealth Management37,500$399K0.01%-1,50013F-HR/ATimeline
GEODE CAPITAL MANAGEMENT, LLCin group GEODE CAPITAL MANAGEMENT, LLC20,514$218K<0.01%013F-HRTimelineGroup
ABC ARBITRAGE SAin group ABC ARBITRAGE SA20,000$213K0.02%new13F-HRTimelineGroup
Tuttle Capital Management, LLC15,000$159K0.35%013F-HRTimeline
HRT FINANCIAL LP10,000$106K<0.01%013F-HRTimeline
LONGFELLOW INVESTMENT MANAGEMENT CO LLC550$5.85K<0.01%-6,97013F-HRTimeline
MORGAN STANLEYin group MORGAN STANLEY61$648<0.01%+4213F-HR/ATimelineGroup
Quarry LP11$117<0.01%-23,70013F-HRTimeline