옥타브 스페셜티 그룹 주식회사
US ˙ NYSE ˙ US0231398845
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SecurityAMBC / Octave Specialty Group, Inc.
InstitutionQUANTITATIVE MASTER SERIES LLC - Master Small Cap Index Series
Latest Disclosed Ownership79,059 shares
Latest Disclosed Value $ 561,318
QUANTITATIVE MASTER SERIES LLC - Master Small Cap Index Series ownership in AMBC / Octave Specialty Group, Inc.

On August 26, 2025 - QUANTITATIVE MASTER SERIES LLC - Master Small Cap Index Series filed a NPORT-P form disclosing ownership of 79,059 shares of Octave Specialty Group, Inc. (US:AMBC) valued at $561,319 USD as of June 30, 2025. The entity filed a previous NPORT-P on May 28, 2025 disclosing 79,059 shares of Octave Specialty Group, Inc.. This represents a change in shares of 0.00% during the quarter. The current value of the position is $713,903 USD.

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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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)
2025-08-26 2025-06-30 NP Ambac Financial Group EC US0231398845 79,059 0 0.00 561 -18.81 0.0126
2025-05-28 2025-03-31 NP Ambac Financial Group EC US0231398845 79,059 4,180 5.58 692 -27.03 0.0166
2025-02-25 2024-12-31 NP Ambac Financial Group EC US0231398845 74,879 -11,643 -13.46 947 -2.27 0.0207
2024-11-26 2024-09-30 NP Ambac Financial Group EC US0231398845 86,522 4,005 4.85 970 -8.33 0.0183
2024-08-26 2024-06-30 NP Ambac Financial Group EC US0231398845 82,517 -27,452 -24.96 1,058 13.41 0.0215
2024-05-28 2024-03-31 NP Ambac Financial Group EC US0231398845 79,115 -22,997 -22.52 1,237 89.28 0.0258
2024-02-26 2023-12-31 NP Ambac Financial Group EC US0231398845 79,115 -39,354 -33.22 1,304 108.81 0.0278
2023-11-28 2023-09-30 NP Ambac Financial Group EC US0231398845 75,816 -34,851 -31.49 914 88.45 0.0239
2023-08-25 2023-06-30 NP Ambac Financial Group EC US0231398845 75,816 -15,256 -16.75 1,080 184.70 0.0256
2023-05-26 2023-03-31 NP Ambac Financial Group EC US0231398845 71,310 2,398 3.48 1,104 -8.16 0.0294
2023-02-24 2022-12-31 NP Ambac Financial Group EC US0231398845 68,912 -2,522 -3.53 1,202 31.98 0.0331
2022-11-25 2022-09-30 NP Ambac Financial Group EC US0231398845 71,434 0 0.00 911 12.35 0.0261
2022-08-25 2022-06-30 NP Ambac Financial Group EC US0231398845 71,434 0 0.00 811 9.16 0.0224
2022-05-26 2022-03-31 NP Ambac Financial Group EC US0231398845 71,434 3,119 4.57 743 -32.30 0.0173
2022-02-25 2021-12-31 NP Ambac Financial Group EC US0231398845 68,315 0 0.00 1,096 12.07 0.0238
2021-11-24 2021-09-30 NP Ambac Financial Group EC US0231398845 68,315 0 0.00 978 -8.51 0.0216
2021-08-26 2021-06-30 NP Ambac Financial Group EC US0231398845 68,315 0 0.00 1,070 -6.47 0.0229
2021-05-27 2021-03-31 NP Ambac Financial Group EC US0231398845 68,315 -40,432 -37.18 1,144 410.27 0.0259
2021-02-25 2020-12-31 NP Ambac Financial Group EC US0231398845 65,849 -42,898 -39.45 1,013 336.21 0.0259
2020-11-25 2020-09-30 NP Ambac Financial Group EC US0231398845 74,721 -34,026 -31.29 954 372.28 0.0306
2020-08-27 2020-06-30 NP Ambac Financial Group EC US0231398845 74,721 -34,026 -31.29 1,070 334.96 0.0350
2020-06-01 2020-03-31 NP Ambac Financial Group EC US0231398845 78,047 8,261 11.84 963 -36.01 0.0394
2020-02-27 2019-12-31 NP Ambac Financial Group EC 023139884 69,786 -26,824 -27.77 1,505 577.93 0.0453
2019-11-27 2019-09-30 NP Ambac Financial Group EC US0231398845 72,454 -24,156 -25.00 1,416 737.87 0.0468
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.