Best Spac I Acquisition Corp

CUSIP: G1069P103 | 30 institutional holders

Compare Detailed Historical Funds Options Short Interest 13D/13G Peers Targeting Trading Summary Profile

Beneficial Ownership — 13D / 13G

5%+ stakes reported outside the quarterly cycle. A 13D is due within five business days of the event below, so these figures lead the holders table until the filer's next 13F catches up to them.

Holder	Shares	% of Class	Change	Event Date	vs 13F
13DTsang Claudius	1,652,000	80.0%	New 5%+ stake	Sep 29, 2026	No 13F filer matched
13G/AYun Chen	0	0.0%	No shares held	Sep 29, 2026

Institutional Holders — Q2 2026

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Mizuho Securities USA LLC533,699

0.1% of portfolio$5.4M

Susquehanna International Group, LLP14,437

0.0% of portfolio$167.5K

UBS Group AG4,480

0.0% of portfolio$53.2K

Clear Street Group Inc.397

0.0% of portfolio$4.7K

Morgan Stanley28

0.0% of portfolio$332

				Style	Turnover	Location	Filed
Mizuho Securities USA LLC	533,699	$5.4M	0.1%	Core	High	New York, NY	2026-07-28
Susquehanna International Group, LLP	14,437	$167.5K	0.0%	Growth	High	Bala Cynwyd, PA	2026-08-14
UBS Group AG	4,480	$53.2K	0.0%	Core	Medium	Zurich, Switzerland	2026-08-13
Clear Street Group Inc.	397	$4.7K	0.0%	Agg Growth	Medium	New York, NY	2026-08-12
Morgan Stanley	28	$332	0.0%	Core	Low	New York, NY	2026-08-13

13DTsang Claudius1,652,000

80.0% of class · Sep 29, 2026New 5%+ stake

No 13F filer matched

13G/AYun Chen0

0.0% of class · Sep 29, 2026No shares held

No 13F filer matched

13G/A Rivernorth Capital Management, LLC0

0.0% of class · Jun 30, 2026No shares held

400,000 sh (Mar 31, 2026)

13G/AW. R. Berkley Corporation0

0.0% of class · Jun 30, 2026No shares held

No 13F filer matched

13G/A Mizuho Financial Group Inc0

0.0% of class · Jun 30, 2026No shares held

Not yet in a 13F