Octave Specialty Group, Inc.
US ˙ NYSE ˙ US0231398845
DIESES SYMBOL IST NICHT MEHR AKTIV

SecurityAMBC / Octave Specialty Group, Inc.
InstitutionSquarepoint Ops LLC
Latest Disclosed Ownership76,907 shares
Latest Disclosed Value $ 357,618
Squarepoint Ops LLC ownership in AMBC / Octave Specialty Group, Inc.

On May 15, 2026 - Squarepoint Ops LLC filed a 13F-HR form disclosing ownership of 76,907 shares of Octave Specialty Group, Inc. (US:AMBC) valued at $357,618 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 0 shares of Octave Specialty Group, Inc.. The current value of the position is $694,470 USD.

Squarepoint Ops LLC has a history of taking positions in derivatives of the underlying security (AMBC) in the form of stock options. The firm currently holds call options representing 0 of underlying shares valued at $0 USD and put options representing 0 of underlying shares valued at $0 USD .

Note: prior versions of this page mistakenly stated that the share values represented the number of options, not the number of underlying shares. For more information on the data backing these reports, please see the SEC document Frequently Asked Questions About Form 13F.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Institutional Put/Call Ratios
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In addition to reporting standard equity and debt issues, institutions with more than 100MM assets under management must also disclose their put and call option holdings. Since put options generally indicate negative sentiment, and call options indicate positive sentiment, we can get a sense of the overall institutional sentiment by plotting the ratio of puts to calls. The chart to the right plots the historical put/call ratio for this instrument.

Using Put/Call Ratio as an indicator of investor sentiment overcomes one of the key deficiencies of using total institutional ownership, which is that a significant amount of assets under management are invested passively to track indices. Passively-managed funds do not typically buy options, so the put/call ratio indicator more closely tracks the sentiment of actively-managed funds.

AMBC / Octave Specialty Group, Inc. Historical Put/Call Ratio
Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date
Effective
Date
Form Security Class ID Avg Price
Paid (Est)
Reported
Shares
ΔShares ΔShares
(%)
Reported
Value
(x1000)
ΔValue
(%)
Alloc
(%)
ΔAlloc ΔAlloc (%) Cost Basis
(x1000)
Unrealized
Gain/Loss
(x1000)
2026-05-15 2026-03-31 13F OCTAVE SPECIALTY GROUP COM NEW 023139884 76,907 76,907 358 0.0004
2026-02-13 2025-12-31 13F AMBAC FINL GROUP COM NEW 023139884 0 -100.00 0
2025-11-14 2025-09-30 13F AMBAC FINL GROUP COM NEW 023139884 175,017 -291,352 -62.47 1,460 -55.93 0.0015
2025-08-27 2025-06-30 13F/A-1 AMBAC FINL GROUP COM NEW 023139884 466,369 233,986 100.69 3,311 62.86 0.0034
2025-08-14 2025-06-30 13F AMBAC FINL GROUP COM NEW 023139884 466,369 233,986 3,311 0.0034
2025-08-27 2025-03-31 13F/A-1 AMBAC FINL GROUP COM NEW 023139884 232,383 111,535 92.29 2,033 33.05 0.0025
2025-05-15 2025-03-31 13F AMBAC FINL GROUP COM NEW 023139884 232,383 111,535 2,033 0.0025
2025-02-14 2024-12-31 13F AMBAC FINL GROUP COM NEW 023139884 120,848 -130,801 -51.98 1,529 -45.82 0.0015
2024-11-14 2024-09-30 13F AMBAC FINL GROUP COM NEW 023139884 251,649 146,209 138.67 2,821 108.73 0.0044
2024-08-14 2024-06-30 13F AMBAC FINL GROUP COM NEW 023139884 105,440 84,164 395.58 1,352 306.93 0.0022
2024-05-15 2024-03-31 13F AMBAC FINL GROUP COM NEW 023139884 21,276 -12,139 -36.33 333 -39.64 0.0006
2024-02-14 2023-12-31 13F AMBAC FINL GROUP COM NEW 023139884 33,415 -31,942 -48.87 551 -30.20 0.0010
2023-11-14 2023-09-30 13F AMBAC FINL GROUP COM NEW 023139884 65,357 41,406 172.88 788 131.09 0.0019
2023-08-14 2023-06-30 13F AMBAC FINL GROUP COM NEW 023139884 23,951 23,951 341 0.0010
2022-05-16 2022-03-31 13F AMBAC FINL GROUP COM NEW 023139884 0 -43,686 -100.00 0 -100.00
2022-02-14 2021-12-31 13F AMBAC FINL GROUP COM NEW 023139884 43,686 43,686 701 0.0019
2021-05-17 2021-03-31 13F AMBAC FINL GROUP COM NEW 023139884 0 -11,818 -100.00 0 -100.00
2021-02-16 2020-12-31 13F AMBAC FINL GROUP COM NEW 023139884 11,818 11,818 182 0.0014
2020-11-16 2020-09-30 13F AMBAC FINL GROUP COM NEW 023139884 0 -12,343 -100.00 0 -100.00
2020-08-14 2020-06-30 13F AMBAC FINL GROUP COM NEW 023139884 12,343 -30,240 -71.01 177 -66.29 0.0029
2020-05-15 2020-03-31 13F AMBAC FINL GROUP COM NEW 023139884 42,583 2,066 5.10 525 -39.93 0.0134
2020-02-14 2019-12-31 13F AMBAC FINL GROUP COM NEW 023139884 40,517 10,186 33.58 874 47.39 0.0052
2019-11-14 2019-09-30 13F AMBAC FINL GROUP COM NEW 023139884 30,331 30,331 593 0.0053
2019-08-14 2019-06-30 13F AMBAC FINL GROUP COM NEW 023139884 0 -10,873 -100.00 0 -100.00
2019-05-15 2019-03-31 13F AMBAC FINL GROUP COM NEW 023139884 10,873 -78,039 -87.77 197 -87.15 0.0021
2019-02-14 2018-12-31 13F AMBAC FINL GROUP COM NEW 023139884 88,912 56,222 171.99 1,533 129.49 0.0178
2018-11-14 2018-09-30 13F AMBAC FINL GROUP COM NEW 023139884 32,690 32,690 668 0.0080
2018-05-15 2018-03-31 13F AMBAC FINL GROUP COM NEW 023139884 0 -20,124 -100.00 0 -100.00
2018-02-14 2017-12-31 13F AMBAC FINL GROUP COM NEW 023139884 20,124 20,124 322 0.0056
2017-05-15 2017-03-31 13F AMBAC FINL GROUP COM NEW 023139884 0 -24,800 -100.00 0 -100.00
2017-02-14 2016-12-31 13F AMBAC FINL GROUP COM NEW 023139884 24,800 24,800 558 0.0228
Disclosed Call Options
File
Date
Effective
Date
Form Security Class ID Opt Avg Share
Price
Shares ΔShares
(%)
Value
(x1000)
ΔValue
(%)
Prior Allocation
(%)
Allocation
(%)
ΔAllocation
(%)
Cost Basis
(x1000)
Profit
(x1000)
Return
(%)
2025-11-14 2025-09-30 13F AMBAC FINL GROUP COM NEW Call 0 -100.00 0 -100.00 n/a n/a n/a
2025-08-27 2025-06-30 13F/A AMBAC FINL GROUP COM NEW Call 132,800 -11.47 943 -28.20 n/a n/a n/a
2025-08-14 2025-06-30 13F AMBAC FINL GROUP COM NEW Call 132,800 943 n/a n/a n/a
2025-08-27 2025-03-31 13F/A AMBAC FINL GROUP COM NEW Call 150,000 900.00 1,312 594.18 n/a n/a n/a
2025-05-15 2025-03-31 13F AMBAC FINL GROUP COM NEW Call 150,000 1,312 n/a n/a n/a
2025-02-14 2024-12-31 13F AMBAC FINL GROUP COM NEW Call 15,000 190 n/a n/a n/a
Disclosed Put Options
File
Date
Effective
Date
Form Security Class ID Opt Avg Share Price Shares ΔShares
(%)
Value
(x1000)
ΔValue
(%)
Prior Allocation
(%)
Allocation
(%)
ΔAllocation
(%)
Cost Basis
(x1000)
Profit
(x1000)
Return
(%)
2025-08-27 2025-03-31 13F/A AMBAC FINL GROUP COM NEW Put 0 -100.00 0 -100.00 n/a n/a n/a
2025-05-15 2025-03-31 13F AMBAC FINL GROUP COM NEW Put 0 0 n/a n/a n/a
2025-02-14 2024-12-31 13F AMBAC FINL GROUP COM NEW Put 14,100 178 n/a n/a n/a
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.