ONCHU · 1RT Acquisition Corp. · Holdings

$10.42 At close · Oct 27

Market Cap

$222.96M

21.56M

Volume · Oct 23 131 Avg daily vol (3M) 3093

Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.

Use institutional holdings through the 13F API or MCP → See every holder of ONCHU: 13F, 13D and 13G, insiders and funds →

Some SEC filings for this period have not finished importing. Holder totals and changes may be incomplete; these filings remain queued for recovery.

Quarter:

Holders: 17

Total Value: $32,634,606

Total Shares: 3,156,152

Institutional Ownership Trend

4 quarters

Holder Concentration

Across 17 13F filers · Δ vs Mar 31, 2026

Top Holder

47.5%

+7.5 pts

Top 5

86.3%

+3.0 pts

Top 10

95.3%

+0.8 pts

HHI

2,874

Highly concentrated+644

Who Holds ONCHU

Last 4 quarters through Jun 30, 2026

Each kind of 13F filer's share of the common shares 13F filers report. Holder type comes from regulatory records, never the filer's name; style, turnover and horizon are measured from each filer's own 13F book. The quarter selector does not change this card.

Jun 30, 2026: 17 filers, like-for-like change -15.7%; actively managed books -15.7%.

Holder type	Share	Filers	Change	New	Exited
Registered adviser	63.7%	8	-20.5%	0	2
Exempt adviser	22.2%	1	0.0%	0	0
Bank	4.8%	2	-0.1%	0	1
Broker-dealer	2.4%	1	0.0%	0	0
Benefit plan	1.6%	1	0.0%	0	0
Adviser	0.0%	0	—	0	0
Non-US	0.0%	0	—	0	0
Unknown	5.3%	4	-29.8%	1	0

Style	Share	Filers	Change	New	Exited
Systematic-like	53.0%	2	-22.9%	0	1
Concentrated	3.2%	2	-52.8%	0	1
Diversified active	43.8%	13	+1.5%	1	1
Index-like	0.0%	0	—	0	0
Not measured	0.0%	0	—	0	0
Unknown	0.0%	0	—	0	0

Turnover	Share	Filers	Change	New	Exited
Low turnover	1.6%	1	0.0%	0	0
Medium turnover	7.2%	5	-0.5%	1	2
High turnover	89.9%	10	-14.8%	0	1
Unknown	1.3%	1	-69.6%	0	0
Not measured	0.0%	0	—	0	0

Holding horizon	Share	Filers	Change	New	Exited
Short horizon	11.3%	5	-62.5%	0	1
Medium horizon	26.5%	3	-2.3%	0	1
Long horizon	12.5%	5	+5.9%	1	1
Unknown	49.8%	4	+0.1%	0	0
Not measured	0.0%	0	—	0	0

13F book size	Share	Filers	Change	New	Exited
Under $1B	2.7%	2	-19.1%	0	1
$1B to $10B	12.0%	5	-56.9%	0	1
$10B to $100B	77.7%	7	-3.6%	0	0
$100B or more	7.7%	3	+10.0%	1	1
Not measured	0.0%	0	—	0	0

Client base	Share	Filers	Change	New	Exited
Pooled investment vehicles	62.7%	7	-20.7%	0	2
Registered funds and BDCs	1.0%	1	0.0%	0	0
Other investment advisers	0.0%	0	—	0	0
Unknown	36.3%	9	-5.9%	1	1

Private funds	Share	Filers	Change	New	Exited
Hedge funds	62.7%	7	-20.1%	0	1
Mixed private funds	0.0%	0	-100.0%	0	1
Private funds, type not stated	22.2%	1	0.0%	0	0
No private funds	1.0%	1	0.0%	0	0
Private equity funds	0.0%	0	—	0	0
Unknown	14.1%	8	-13.8%	1	1

Location	Share	Filers	Change	New	Exited
United States	73.0%	14	-3.7%	1	1
Outside the US	27.0%	3	-37.0%	0	2

How the mix is measured

Shares are 13F common shares restated to today's split basis; options and principal amounts are left out. The change compares only filers with a 13F in both quarters and keeps each filer in its bucket of the later quarter on both sides; a filer that continues under a new CIK is compared through its successor. Holder type comes from each filer's current regulatory profile; client base and private funds come from the Form ADV roster current at each quarter end (rosters from December 2019, so an earlier quarter reads Unknown). Style, turnover, horizon and book size are measured from each filer's 13F book in the newest measured quarter, and Not measured means none was. Actively managed books are those measured systematic-like, concentrated or diversified active.

Conviction and Crowding

17 13F filers, quarter ended Jun 30, 2026

Measured across every 13F filer's common-share book once the quarter's filing window closed. Crowding counts filers with high turnover or that advise private funds on Form ADV.

Conviction holders

0.000% of filers hold it in their top 10

Mar 31, 2026: 0

Holders above 5%

median weight 0.006%

Mar 31, 2026: 0

Crowding

—

shares outstanding is an issuer-wide count, not one listing's

Private-fund advisers

—

of shares outstanding

Institutional ownership

—

shares outstanding is an issuer-wide count, not one listing's

Top 10 holders

95.3%

of 13F shares, Herfindahl 0.287

Active holders

-15.7%

like-for-like share change of active filers

5% stakes on record

0 13D, 2 13G (0 institutional, 2 passive, 0 exempt)

How long holders have held it value-weighted 4.0 quarters

Under 1 year 2.89% 1 to 3 years 97.1% 3 years or more 0.000% Since coverage start 0.000%

Managers in the top fifth by current three-year FundScore alpha were net buyers of $0 (0 buying, 0 selling).

Estimated Holder Cost Basis

Quarter ended Jun 30, 2026, on that quarter's share basis

Estimated, never filed: each 13F buy is costed at its quarter's average traded price and each sale keeps the average cost, so this is what holders paid on average if they traded evenly through each quarter.

Estimated avg cost

$10.46

estimated per share

Mar 31, 2026: $10.46

Quarter-end price

$10.34

implied by 13F values

Estimated gain or loss

-1.2%

price against the estimated cost

Estimated at a loss

99.0%

of costed 13F value

Estimated cost covers 98.7% of the 13F shares; positions already held when a filer's 13F history starts, or bought in a quarter without a trusted average price, have no estimate.

Shared Holders

Companies ONCHU's active holders also own, quarter ended Jun 30, 2026

#	Company	Shared holders	Similarity
1	AACB Artius II Acquisition Inc.	4	0.447
2	NHIC NewHold Investment Corp. III	4	0.447
3	CEPV Cantor Equity Partners V, Inc.	7	0.396
4	XRPNU Armada Acquisition Corp. II	4	0.392
5	DRDB Roman DBDR Acquisition Corp. II	4	0.378
6	APAC StoneBridge Acquisition II Corp	3	0.375
7	OBA Oxley Bridge Acquisition Ltd	3	0.375
8	APXT Apex Treasury Corp	4	0.365
9	PONO Pono Capital Four, Inc.	3	0.354
10	RREV RRE Ventures Acquisition Corp.	3	0.354

Shareholder Targets

13F filers that own its peers but not ONCHU, quarter ended Jun 30, 2026

Found through its holder-overlap peers: AACB, NHIC, CEPV, XRPNU, DRDB, APAC, OBA, APXT, PONO, RREV, LWAC, DMAA, ANSC, LPAA, AXIN, CCAQ, PCAP, MCGA, TACH, CCII. 98 filers in all.

#	Filer	In peers	Of book	Largest peers
1	HIGHBRIDGE CAPITAL MANAGEMENT LLC Registered adviser, Diversified active	$103,616,600 13 held	6.14%	DRDB, AXIN, APXT
2	Karpus Management, Inc. Adviser, Diversified active	$87,969,385 12 held	2.57%	DMAA, ANSC, APXT
3	Crossingbridge Advisors, LLC Adviser, Diversified active	$87,957,350 11 held	17.3%	ANSC, RREV, DRDB
4	Arrington Capital Management, LLC Registered adviser, Concentrated	$60,394,320 1 held	67.4%	XRPNU
5	ADAGE CAPITAL PARTNERS GP, L.L.C. Registered adviser, Diversified active	$47,398,250 3 held	0.070%	APXT, RREV, CEPV
6	Fort Baker Capital Management LP Registered adviser, Concentrated	$46,916,965 5 held	4.74%	CCII, ANSC, PCAP
7	GOLDMAN SACHS GROUP INC Holding company, Index-like	$38,900,249 9 held	0.000%	LPAA, ANSC, TACH
8	Wealthspring Capital LLC Registered adviser, Diversified active	$28,850,210 6 held	8.39%	LPAA, TACH, APXT
9	Lineage Point Capital LP Adviser, Diversified active	$28,661,699 13 held	7.50%	APXT, ANSC, TACH
10	MANGROVE PARTNERS IM, LLC Registered adviser, Diversified active	$25,947,634 7 held	1.75%	LWAC, AXIN, CCAQ

Quarterly Activity

vs Mar 31, 2026

New

Increased

Decreased

Sold Out

Unchanged

New and Sold Out count only filers that reported a 13F for both quarters: a first-time filer's book is not a buy, and a fund that has not filed, or withheld its positions under confidential treatment, has not sold.

Holder count: -2

Institutional value: -15.2%

Shares held: -15.7%

Top Buyers

vs Mar 31, 2026

Institution	Added	Now Holds	Open
Mega CITADEL ADVISORS LLC	+2,977	172,678
Large HRT FINANCIAL LP	+2,141	48,842

Top Sellers

vs Mar 31, 2026

Institution	Sold	Now Holds	Open
Large Clear Street Group Inc.	−92,700	40,583
Large Parallax Volatility Advisers, L.P.	−1	12,187

Top New Positions

vs Mar 31, 2026

Institution	Acquired	Value (USD)	Open
Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP	19,128	$197,783

Top Sold-Out Positions

vs Mar 31, 2026

Institution	Previously Held	Last Value (USD)
Mid Polar Asset Management Partners Inc.	500,000	$5,140,000
Small SCOGGIN MANAGEMENT LP	20,000	$205,600
Mega UBS Group AG	179	$1,840

Filter: New 1 Increased 2 Reduced 2 Sold out 3 Unchanged 12

Holder type: Registered adviser 8 Exempt adviser 1 Bank 2 Broker-dealer 1 Benefit plan 1 Unknown 4

Showing 17 of 17

All Common Calls Puts

Compact Export CSV

Holder

Value (USD)

% of 13F

Point72 Asset Management, L.P. ONCHU

$15,510,000

47.53%

1,500,000

LMR Partners LLP ONCHU

$7,238,000

22.18%

700,000

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
LMR PARTNERS (DIFC) Ltd	700,000	$7,238,000	100.0%	Sole

Ghisallo Capital Management LLC ONCHU

$2,585,000

7.92%

250,000

CITADEL ADVISORS LLC ONCHU

$1,785,490

5.47%

172,678

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Citadel Securities GP LLC	2,977	$30,782	1.7%	Defined
Held directly	169,701	$1,754,708	98.3%	Defined

TORONTO DOMINION BANK ONCHU

$1,059,208

3.25%

102,438

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
TD SECURITIES (USA) LLC	102,438	$1,059,208	100.0%	Defined

PEAK6 LLC ONCHU

$775,500

2.38%

75,000

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
PEAK6 Investments LLC joint	75,000	$775,500	100.0%	Defined

Kamunting Street Capital Management, L.P. ONCHU

$620,400

1.90%

60,000

JPMORGAN CHASE & CO ONCHU

$517,000

1.58%

50,000

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
J.P. Morgan Securities LLC	50,000	$517,000	100.0%	Defined

OMERS ADMINISTRATION Corp ONCHU

$516,906

1.58%

49,991

HRT FINANCIAL LP ONCHU

$505,026

1.55%

48,842

Clear Street Group Inc. ONCHU

$419,628

1.29%

40,583

Westchester Capital Management, LLC ONCHU

$318,678

0.98%

30,820

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
WESTCHESTER CAPITAL PARTNERS, LLC	252	$2,605	0.8%	Sole
Virtus Investment Advisers, LLC	28,653	$296,272	93.0%	Other
Held directly	1,915	$19,801	6.2%	Sole

Yakira Capital Management, Inc. ONCHU

$253,174

0.78%

24,485

SUSQUEHANNA INTERNATIONAL GROUP, LLP ONCHU

$197,783

0.61%

19,128

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
G1 EXECUTION SERVICES, LLC	19,128	$197,783	100.0%	Other

Parallax Volatility Advisers, L.P. ONCHU

$126,013

0.39%

12,187

READYSTATE ASSET MANAGEMENT LP ONCHU

$103,400

0.32%

10,000

Walleye Capital LLC ONCHU

$103,400

0.32%

10,000

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Scoggin GP LLC	20,000	$205,600	100.0%	Defined

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
UBS Securities LLC	179	$1,840	100.0%	Defined

Key facts CIK 2054272 CUSIP G6757R105