SCHEDULE 13G Filed 2026-10-27 Event — SEC 0002052113-26-001110 →

BlackRock Portfolio Management LLC → OCTAVE SPECIALTY GROUP INC OSG

Stake: — Shares: — Class: Common Stock

Composite Decision Signal · PASS (LOW BASE-RATE EDGE) Conviction Score: 17/100 · Filer 90d Win Rate: 50% · Hist. 90d Edge: +7.1%

Filer track record (3 filings): 50% 90d win rate, +7.1% 90d edge
Held by 1 tracked 13F institutional manager

Item 4 — Purpose of Transaction

Not extracted from this filing — typically because it's an amendment (13D/A) and Item 4 is unchanged from the parent filing. Read the raw SEC filing →

Cross-References

Insider Activity (last 365d)

10 transactions

0 buys · 0 sales · 7 awards/exercises

Issuer Cluster

1 13D/G filings on this issuer

0 other filings besides this one

Filer Track Record

87 filings by this filer

86 other filings in the data moat

Short Interest · settle 2026-10-15

DTC 2.35

1,362,927 shares short · -3.3% vs prior

Institutional Consensus · 2025-12-31

Held by elite portfolio managers

1 holder · $806K

Point72 Asset Mgmt

Form 4 Insider Transactions · last 365d

Date	Insider	Role	Type	Shares	Price	Value
2026-10-03	LeBlanc Claude	director, officer	Option exercise	15,229	—	—
2026-10-03	LeBlanc Claude	director, officer	F	8,421	$4.60	$39K
2026-10-03	LeBlanc Claude	director, officer	Option exercise	11,628	—	—
2026-10-03	LeBlanc Claude	director, officer	F	11,638	$4.60	$54K
2026-10-03	LeBlanc Claude	director, officer	Option exercise	232,816	—	—
2026-10-03	LeBlanc Claude	director, officer	Option exercise	221,188	—	—
2026-10-03	Smith R Sharon	officer	Option exercise	2,539	—	—
2026-10-03	Smith R Sharon	officer	F	2,539	$4.60	$12K
2026-10-03	Smith R Sharon	officer	Option exercise	55,433	—	—
2026-10-03	Smith R Sharon	officer	Option exercise	52,894	—	—

Other Filings by BlackRock Portfolio Management LLC

Filed	Form	Issuer	Stake	Shares
2026-10-27	SCHEDULE 13G	Vanda Pharmaceuticals Inc.	—	—	view →
2026-10-27	SCHEDULE 13G	AGREE REALTY CORP	—	—	view →
2026-10-27	SCHEDULE 13G	AMERISAFE INC	—	—	view →
2026-10-27	SCHEDULE 13G	HawkEye 360, Inc.	—	—	view →
2026-10-27	SCHEDULE 13G	ISHARES MSCI GERMANY ETF	—	—	view →
2026-10-27	SCHEDULE 13G	Zumiez Inc.	—	—	view →
2026-10-27	SCHEDULE 13G	CDW Corp	—	—	view →
2026-10-27	SCHEDULE 13G	iShares, Inc.	—	—	view →
2026-10-27	SCHEDULE 13G	GLOBANT SA	—	—	view →
2026-10-27	SCHEDULE 13G	CANNAE HOLDINGS, INC	—	—	view →
2026-10-27	SCHEDULE 13G	COLONY BANKCORP INC	—	—	view →
2026-10-27	SCHEDULE 13G	DELCATH SYS INC	—	—	view →
2026-10-27	SCHEDULE 13G	ENANTA PHARMACEUTICALS INC	—	—	view →
2026-10-27	SCHEDULE 13G	CHIRON REAL ESTATE INC	—	—	view →
2026-10-27	SCHEDULE 13G	iShares MSCI Taiwan ETF	—	—	view →
2026-10-27	SCHEDULE 13G	ISHARES SYSTEMATIC BOND ETF	—	—	view →
2026-10-27	SCHEDULE 13G	LENZ THERAPEUTICS, INC.	—	—	view →
2026-10-27	SCHEDULE 13G	NETGEAR INC	—	—	view →
2026-10-27	SCHEDULE 13G	ORION180 INSURANCE GROUP	—	—	view →
2026-10-27	SCHEDULE 13G	Phreesia, Inc.	—	—	view →

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