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Disclosery

MACI MELAR ACQUISITION CORP. I

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SHS CL A (common), issuer CIK 2016221

37 managers (37 13F filers) reported a position in MACI shares at 2026-03-31, 16,149,531 shares in all. 1 filer opened a position and 3 filers sold out during the quarter.

Managers
37
13F filers
37
New
1
Added
6
Reduced
7
Sold out
3
Shares held by filers
16,149,531

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, Q1 2026

Filers in the available 13F reports with a share position at 2026-03-31, 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$16M0.38%013F-HRTimeline
LMR Partners LLPin group LMR Partners LLP1,485,000$16M0.15%013F-HRTimelineGroup
First Trust Capital Management L.P.in group FIRST TRUST ADVISORS LP1,400,000$15.1M0.79%013F-HRTimelineGroup
MIZUHO SECURITIES USA LLCin group MIZUHO FINANCIAL GROUP INC1,250,727$13.4M0.32%+223,45313F-HRTimelineGroup
WOLVERINE ASSET MANAGEMENT LLCin group WOLVERINE ASSET MANAGEMENT LLC1,026,683$11.1M0.17%-2,00613F-HRTimelineGroup
BERKLEY W R CORP998,963$10.8M0.58%+130,47413F-HRTimeline
AQR Arbitrage LLCin group AQR CAPITAL MANAGEMENT LLC996,499$10.8M0.18%-68013F-HRTimelineGroup
Karpus Management, Inc.988,505$10.6M0.33%-156,65013F-HRTimeline
D. E. Shaw & Co., Inc.in group D. E. Shaw & Co., Inc.576,328$6.22M<0.01%013F-HRTimelineGroup
Cable Car Capital, LP492,500$5.3M1.83%013F-HRTimeline
Wealthspring Capital LLCin group Wealthspring Capital LLC447,964$4.82M1.15%-7,75213F-HRTimelineGroup
Radcliffe Capital Management, L.P.426,939$4.6M0.34%013F-HRTimeline
Westchester Capital Management, LLCin group Westchester Capital Managemen…424,707$4.58M0.22%013F-HRTimelineGroup
GLAZER CAPITAL, LLCin group GLAZER CAPITAL, LLC398,589$4.29M0.09%-157,68913F-HRTimelineGroup
Magnetar Financial LLCin group Magnetar Financial LLC371,250$4.01M0.04%013F-HRTimelineGroup
Crossingbridge Advisors, LLC355,236$3.83M0.69%+143,70113F-HRTimeline
L1 Global Manager Pty Ltd335,000$3.61M2.91%013F-HRTimeline
Hudson Bay Capital Management LPin group Hudson Bay Capital Management…325,000$3.51M0.02%013F-HRTimelineGroup
Alberta Investment Management Corp325,000$3.51M0.02%013F-HRTimeline
PICTON MAHONEY ASSET MANAGEMENT325,000$3.5M0.04%013F-HRTimeline
GOLDMAN SACHS GROUP INCin group GOLDMAN SACHS GROUP INC299,331$3.22M<0.01%013F-HRTimelineGroup
RIVERNORTH CAPITAL MANAGEMENT, LLC299,140$3.22M0.16%013F-HRTimeline
HIGHBRIDGE CAPITAL MANAGEMENT LLC288,804$3.12M0.2%new13F-HRTimeline
RiverPark Advisors, LLCin group RiverPark Advisors, LLC225,333$2.43M0.88%+38,79813F-HRTimelineGroup
TORONTO DOMINION BANKin group TORONTO DOMINION BANK183,612$1.98M<0.01%+50,41413F-HRTimelineGroup
Periscope Capital Inc.125,000$1.35M0.23%-58,61213F-HRTimeline
DELTEC ASSET MANAGEMENT LLC100,000$1.08M0.2%013F-HRTimeline
MOORE CAPITAL MANAGEMENT, LP75,000$808K0.03%013F-HRTimeline
Dakota Wealth Management37,500$404K0.01%013F-HR/ATimeline
HEIGHTS CAPITAL MANAGEMENT, INCin group HEIGHTS CAPITAL MANAGEMENT, I…34,755$375K0.11%-17,40613F-HRTimelineGroup
GEODE CAPITAL MANAGEMENT, LLCin group GEODE CAPITAL MANAGEMENT, LLC20,514$221K<0.01%013F-HRTimelineGroup
Tuttle Capital Management, LLC15,000$162K0.27%013F-HRTimeline
HRT FINANCIAL LP10,000$107K<0.01%013F-HRTimeline
LONGFELLOW INVESTMENT MANAGEMENT CO LLC550$5.92K<0.01%013F-HRTimeline
MORGAN STANLEYin group MORGAN STANLEY80$862<0.01%+1913F-HRTimelineGroup
Quarry LP11$118<0.01%013F-HRTimeline
RLH Capital LLC11$118<0.01%13F-HRTimeline