Vault-13

OYSTER ENTERPRISES II ACQUIS OYSE

ORD SHS CL A · Common Stock · CUSIP G6861F104

62 institutional holders +2 vs Q1 2026
24,660,13624.7m shares reported held*
$253.9mreported value*
3 new 9 added 10 reduced 1 sold out net bought ≈ $1.1m (+110.4k shares)

* Summed across managers. Shares that two managers' reports both contain – a subsidiary's holdings that its parent's report includes too, or a sub-adviser's in its client's – are counted once. Holder counts are more reliable. Implied quarter-end price ≈ $10.30.

Trends to Q2 2026

Institutional holders

Managers reporting a position, each quarter

0255075Q3 25: 52Q4 25: 60Q1 26: 60Q2 26: 6262Q3 25Q4 25Q1 26Q2 26
Numbers
QuarterHolders
Q3 202552
Q4 202560
Q1 202660
Q2 202662

Buyers vs sellers

Managers adding to or starting a position, vs cutting or selling out

Bought or addedCut or sold out
20020Q4 25: 20 bought or addedQ4 25: 7 cut or sold outQ4 25Q1 26: 7 bought or addedQ1 26: 18 cut or sold outQ1 26Q2 26: 12 bought or addedQ2 26: 11 cut or sold outQ2 26
Numbers
QuarterBought or addedCut or sold out
Q4 2025207
Q1 2026718
Q2 20261211

Calls vs puts

Options held, notional value, last 4 quarters. P/C = puts ÷ calls

CallsPuts
$0$5k$10k$15k$20kQ3 25 calls: $17.0kQ3 25 puts: $0Q3 25P/C 0.00Q4 25 calls: $0Q4 25 puts: $0Q4 25P/C —Q1 26 calls: $0Q1 26 puts: $0Q1 26P/C —Q2 26 calls: $0Q2 26 puts: $0Q2 26P/C —
Numbers
QuarterCallsPutsP/C
Q3 2025$17.0k$00.00
Q4 2025$0$0—
Q1 2026$0$0—
Q2 2026$0$0—

Biggest buyers

MIZUHO SECURITIES USA LLC Added +146,483+146.5k
Karpus Management, Inc. Added +145,935+145.9k
Calamos Advisors LLC New +123,093+123.1k
Limestone Investment Advisors LP New +50,094+50.1k
HIGHBRIDGE CAPITAL MANAGEMENT LLC New +47,911+47.9k
Schonfeld Strategic Advisors LLC Added +27,788+27.8k
Parallax Volatility Advisers, L.P. Added +21,576+21.6k
PICTON MAHONEY ASSET MANAGEMENT Added +15,000+15.0k
GLAZER CAPITAL, LLC Added +12,348+12.3k
AQR Arbitrage LLC Added +4,900+4.9k

Biggest sellers

Meteora Capital, LLC Reduced -306,993-307.0k
Walleye Capital LLC Sold out -75,000-75.0k
Shaolin Capital Management LLC Reduced -39,998-40.0k
GABELLI FUNDS LLC Reduced -25,000-25.0k
Clear Street Group Inc. Reduced -20,587-20.6k
Verition Fund Management LLC Reduced -9,608-9.6k
Bulldog Investors, LLP Reduced -4,000-4.0k
WOLVERINE ASSET MANAGEMENT LLC Reduced -2,410-2.4k
SUSQUEHANNA INTERNATIONAL GROUP, LLP Reduced -1,012-1.0k
Polar Asset Management Partners Inc. Reduced -100-100

Major shareholders (over 5%)

Anyone who owns more than 5% of a class of the company's shares has to say so: on Schedule 13D if they may try to influence or control the company, on 13G if they're a passive investor, and update it as the stake changes. Each holder's latest filing, from 19 Dec 2024 on; percentages are of the share class, as the holder worked them out.

HolderStakeChangeShares Last filed
Oyster Enterprises II LLC 13D · may seek influence new · filed 2025-06-02
Stated purposeIn connection with the organization of the Issuer, on October 16, 2024, the Sponsor paid $25,000, or approximately $0.003 per share, to cover certain of the Issuer's offering costs in exchange for 7,187,500 Class B Ordinary Shares (the "Founder Shares"), pursuant to the Securities Subscription Agreement dated as of October 16, 2024 between the Sponsor and the Issuer (the "Founder Share Purchase Agreement") as more fully described in Item 6 of this Section 13D, which information is incorporated by reference. In May 2025, the Issuer issued an additional 718,750 founder shares to the Sponsor in a share capitalization, resulting in the Sponsor holding an aggregate of 7,906,250 Founder Shares. On May 23, 2025, simultaneously with the consummation of the Issuer's Initial Public Offering (the "I… Full filing
 24.7% new 8.4m≈ $86.0m 2025-06-02
BARCLAYS PLC 13G · institution -2.8 pts · filed 2026-02-11 5.7% -2.8 pts 1.5m≈ $15.3m 2026-02-11
METEORA CAPITAL, LLC 13G · institution new · filed 2025-11-14 5.2% new 1.3m≈ $13.8m 2025-11-14

Fell to 5% or below in the last year: AQR CAPITAL MANAGEMENT LLC (4.4%, 2025-11-12)

Insider purchases and sales since 1 Apr 2026

Shares bought or sold by the company's own officers, directors and 10% owners, in the open market or privately, as they reported to the SEC on Form 4 (due within two business days of the trade). Grants, option exercises, shares withheld for tax and gifts aren't included.

Officers and directors buying vs selling

Number of people, by quarter (10% owners not included)

BuyingSelling
101Q4 24: 0 buyingQ4 24: 0 sellingQ1 25: 0 buyingQ1 25: 0 sellingQ1 25Q2 25: 1 buyingQ2 25: 0 sellingQ3 25: 0 buyingQ3 25: 0 sellingQ3 25Q4 25: 0 buyingQ4 25: 0 sellingQ1 26: 0 buyingQ1 26: 0 sellingQ1 26Q2 26: 0 buyingQ2 26: 0 sellingQ3 26: 0 buyingQ3 26: 0 sellingQ3 26
Numbers
QuarterBuyingBoughtSellingSoldSold under a plan
Q4 20240—0——
Q1 20250—0——
Q2 20251$4.5m0——
Q3 20250—0——
Q4 20250—0——
Q1 20260—0——
Q2 20260—0——
Q3 20260—0——

None reported since 1 Apr 2026.

Holders, Q2 2026

#ManagerLocationShares Value% of their portfolioChangeShares change
1 GLAZER CAPITAL, LLC 0.40% of their portfolio New York, NY 1,562,3481.6m $16.1m $16.1m 0.40% Added +12.3k +12,348
2 Magnetar Financial LLC 0.12% of their portfolio EVANSTON, IL 1,300,0001.3m $13.4m $13.4m 0.12% Unchanged
3 Westchester Capital Management, LLC 0.67% of their portfolio VALHALLA, NY 1,295,1121.3m $13.4m $13.4m 0.67% Unchanged
4 D. E. Shaw & Co., Inc. 0.01% of their portfolio New York, NY 1,252,3501.3m $12.9m $12.9m 0.01% Unchanged
5 Linden Advisors LP 0.06% of their portfolio New York, NY 1,150,0001.1m $11.9m $11.9m 0.06% Unchanged
6 AQR Arbitrage LLC 0.16% of their portfolio Greenwich, CT 1,100,5841.1m $11.3m $11.3m 0.16% Added +4.9k +4,900
7 LMR Partners LLP 0.08% of their portfolio LONDON, X0 1,100,0001.1m $11.3m $11.3m 0.08% Unchanged
8 PICTON MAHONEY ASSET MANAGEMENT 0.10% of their portfolio Toronto, A6 1,015,0001.0m $10.4m $10.4m 0.10% Added +15.0k +15,000
9 TENOR CAPITAL MANAGEMENT Co., L.P. 0.13% of their portfolio NEW YORK, NY 900,000900.0k $9.3m $9.3m 0.13% Unchanged
10 Meteora Capital, LLC 0.75% of their portfolio Boca Raton, FL 881,794881.8k $9.1m $9.1m 0.75% Reduced -307.0k -306,993
11 Karpus Management, Inc. 0.24% of their portfolio Pittsford, NY 803,996804.0k $8.3m $8.3m 0.24% Added +145.9k +145,935
12 TWO SIGMA INVESTMENTS, LP 0.01% of their portfolio NEW YORK, NY 797,500797.5k $8.2m $8.2m 0.01% Unchanged
13 Hudson Bay Capital Management LP 0.03% of their portfolio STAMFORD, CT 696,530696.5k $7.2m $7.2m 0.03% Unchanged
14 MILLENNIUM MANAGEMENT LLC 0.00% of their portfolio NEW YORK, NY 669,000669.0k $6.9m $6.9m 0.00% Added +11 +11
15 Radcliffe Capital Management, L.P. 0.49% of their portfolio BALA CYNWYD, PA 623,742623.7k $6.4m $6.4m 0.49% Added +1 +1
16 MOORE CAPITAL MANAGEMENT, LP 0.12% of their portfolio NEW YORK, NY 500,000500.0k $5.1m $5.1m 0.12% Unchanged
17 BERKLEY W R CORP 0.24% of their portfolio Greenwich, CT 475,872475.9k $4.9m $4.9m 0.24% Unchanged
18 RIVERNORTH CAPITAL MANAGEMENT, LLC 0.23% of their portfolio WEST PALM BEACH, FL 475,000475.0k $4.9m $4.9m 0.23% Unchanged
19 ARISTEIA CAPITAL, L.L.C. 0.07% of their portfolio GREENWICH, CT 454,000454.0k $4.7m $4.7m 0.07% Unchanged
20 MANGROVE PARTNERS IM, LLC 0.30% of their portfolio Greenwich, CT 450,000450.0k $4.6m $4.6m 0.30% Unchanged
21 Alberta Investment Management Corp 0.02% of their portfolio EDMONTON, A0 400,000400.0k $4.1m $4.1m 0.02% Unchanged
22 Davidson Kempner Capital Management LP 0.07% of their portfolio New York, NY 400,000400.0k $4.1m $4.1m 0.07% Unchanged
23 Polar Asset Management Partners Inc. 0.08% of their portfolio TORONTO, A6 399,800399.8k $4.1m $4.1m 0.08% Reduced -100 -100
24 COMMONWEALTH OF PENNSYLVANIA PUBLIC SCHOOL EMPLS RETRMT SYS 0.02% of their portfolio HARRISBURG, PA 350,000350.0k $3.6m $3.6m 0.02% Unchanged
25 GOLDMAN SACHS GROUP INC 0.00% of their portfolio NEW YORK, NY 346,312346.3k $3.6m $3.6m 0.00% Unchanged
26 HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND 0.01% of their portfolio TORONTO, A6 340,000340.0k $3.5m $3.5m 0.01% Unchanged
27 Bulldog Investors, LLP 0.73% of their portfolio SADDLE BROOK, NJ 320,436320.4k $3.3m $3.3m 0.73% Reduced -4.0k -4,000
28 Verition Fund Management LLC 0.02% of their portfolio GREENWICH, CT 292,103292.1k $3.0m $3.0m 0.02% Reduced -9.6k -9,608
29 TORONTO DOMINION BANK 0.00% of their portfolio TORONTO, ONTARIO, A6 277,000277.0k $2.9m $2.9m 0.00% Unchanged
30 Context Capital Management, LLC 0.05% of their portfolio LAJOLLA, CA 250,782250.8k $2.6m $2.6m 0.05% Unchanged
31 GABELLI & Co INVESTMENT ADVISERS, INC. 0.38% of their portfolio Rye, NY 250,700250.7k $2.6m $2.6m 0.38% Unchanged
32 WHITEBOX ADVISORS LLC 0.04% of their portfolio MINNEAPOLIS, MN 250,000250.0k $2.6m $2.6m 0.04% Unchanged
33 Periscope Capital Inc. 0.40% of their portfolio Toronto, A6 244,345244.3k $2.5m $2.5m 0.40% Unchanged
34 Schonfeld Strategic Advisors LLC 0.01% of their portfolio NEW YORK, NY 235,091235.1k $2.4m $2.4m 0.01% Added +27.8k +27,788
35 WOLVERINE ASSET MANAGEMENT LLC 0.03% of their portfolio CHICAGO, IL 214,698214.7k $2.2m $2.2m 0.03% Reduced -2.4k -2,410
36 Shaolin Capital Management LLC 0.12% of their portfolio Miami, FL 210,002210.0k $2.2m $2.2m 0.12% Reduced -40.0k -39,998
37 MMCAP International Inc. SPC 0.17% of their portfolio GRAND CAYMAN, E9 200,000200.0k $2.1m $2.1m 0.17% Unchanged
38 MYDA Advisors LLC 0.50% of their portfolio WOODMERE, NY 199,000199.0k $2.0m $2.0m 0.50% Unchanged
39 Clear Street Group Inc. 0.01% of their portfolio NEW YORK, NY 178,908178.9k $1.8m $1.8m 0.01% Reduced -20.6k -20,587
40 GABELLI FUNDS LLC 0.01% of their portfolio Rye, NY 174,300174.3k $1.8m $1.8m 0.01% Reduced -25.0k -25,000
41 SONA ASSET MANAGEMENT (US) LLC 0.07% of their portfolio NEW YORK, NY 173,344173.3k $1.8m $1.8m 0.07% Unchanged
42 MIZUHO SECURITIES USA LLC 0.02% of their portfolio NEW YORK, NY 163,173163.2k $1.7m $1.7m 0.02% Added +146.5k +146,483
43 First Trust Capital Management L.P. 0.09% of their portfolio CHICAGO, IL 150,000150.0k $1.5m $1.5m 0.09% Unchanged
44 Mint Tower Capital Management B.V. 0.18% of their portfolio AMSTERDAM, P7 150,000150.0k $1.5m $1.5m 0.18% Unchanged
45 Calamos Advisors LLC 0.00% of their portfolio NAPERVILLE, IL 123,093123.1k $1.3m $1.3m 0.00% New
46 DLD Asset Management, LP 0.08% of their portfolio NEW YORK, NY 100,038100.0k $1.0m $1.0m 0.08% Unchanged
47 L1 Global Manager Pty Ltd 0.83% of their portfolio Melbourne, C3 100,000100.0k $1.0m $1.0m 0.83% Unchanged
48 O'Connor Alternative Investments LLC 0.08% of their portfolio NEW YORK, NY 100,000100.0k $1.0m $1.0m 0.08% Unchanged
49 Parallax Volatility Advisers, L.P. 0.03% of their portfolio San Francisco, CA 90,61690.6k $934.3k $934.3k 0.03% Added +21.6k +21,576
50 683 Capital Management, LLC 0.07% of their portfolio NEW YORK, NY 75,00075.0k $771.8k $771.8k 0.07% Unchanged
51 Limestone Investment Advisors LP 0.26% of their portfolio NEW YORK, NY 50,09450.1k $515.5k $515.5k 0.26% New
52 HEIGHTS CAPITAL MANAGEMENT, INC 0.12% of their portfolio SAN FRANCISCO, CA 50,00050.0k $515.5k $515.5k 0.12% Unchanged
53 DELTEC ASSET MANAGEMENT LLC 0.08% of their portfolio New York, NY 50,00050.0k $514.5k $514.5k 0.08% Unchanged
54 GRITSTONE ASSET MANAGEMENT LLC 0.49% of their portfolio Bethesda, MD 49,42949.4k $508.6k $508.6k 0.49% Unchanged
55 HIGHBRIDGE CAPITAL MANAGEMENT LLC 0.02% of their portfolio NEW YORK, NY 47,91147.9k $492.0k $492.0k 0.02% New
56 Dakota Wealth Management 0.01% of their portfolio PALM BEACH GARDENS, FL 40,90040.9k $420.9k $420.9k 0.01% Unchanged
57 BNP PARIBAS FINANCIAL MARKETS 0.00% of their portfolio PARIS, I0 39,89839.9k $411.3k $411.3k 0.00% Unchanged
58 ABC ARBITRAGE SA 0.03% of their portfolio PARIS, I0 25,00025.0k $257.2k $257.2k 0.03% Unchanged
59 SUSQUEHANNA INTERNATIONAL GROUP, LLP 0.00% of their portfolio BALA CYNWYD, PA 20,83420.8k $214.8k $214.8k 0.00% Reduced -1.0k -1,012
60 GEODE CAPITAL MANAGEMENT, LLC 0.00% of their portfolio BOSTON, MA 14,45814.5k $149.1k $149.1k 0.00% Unchanged
61 Warberg Asset Management LLC 0.03% of their portfolio WINNETKA, IL 10,00010.0k $102.9k $102.9k 0.03% Unchanged
62 MORGAN STANLEY 0.00% of their portfolio NEW YORK, NY 4343 $442 $442 0.00% Reduced -24 -24