Madame Gu (IMO 1011331) is a sanctioned vessel. As of 2026-07-12, it matched 2 active sanctions records — including the OFAC SDN, SDN entry #37454, program UKRAINE-EO13661. Source: OFAC SDN. (Sanctions lists update daily; verify the current designation before acting.) Check the current status for IMO 1011331 at https://arcnautical.com/check/1011331.
Madame Gu is a Cayman Islands-flagged vessel with 2 active sanctions designations (OFAC SDN + OpenSanctions) · ownership opacity 70/100.
Key verifiable facts
OFAC SDN designationSDN entry #37454 — program UKRAINE-EO13661Source: OFAC SDN List · as of 2026-07-12OFAC's structured SDN feed carries no per-entity URL; verify the entry via OFAC's sanctions search.
Flag-state PSC performanceCayman Islands flag — Paris MoU White List (1.4% 3-yr detention); Tokyo MoU White List (1.1%)Source: Paris MoU WGB 2021–2023 + Tokyo MoU 2023 lists · reconciled as of 2026-05-30
Sanctions screeningScreened against OFAC SDN, EU Consolidated, UN Security Council, UK HMT/OFSI, and OpenSanctions vessel lists — 2 confirmed matches on vessel identifier.Source: ArcNautical sanctions screening · as of 2026-07-12
Madame Gu matched 2 sanctions records. 2 of these match on exact IMO or MMSI — the highest-confidence form of sanctions identification.
Source list
Programs
Match type
Confidence
OFAC SDN
UKRAINE-EO13661, RUSSIA-EO14024
Exact IMO
100%
OpenSanctions
us_ofac_sdn, us_trade_csl, ua_war_sanctions
Exact IMO
100%
Corporate Ownership & Opacity
70/100Elevated opacity
Registered entity
Not in GLEIF registry
LEI registration is voluntary for non-financial maritime entities; absence is itself a signal.
+35No GLEIF/LEI record (LEI registration voluntary for non-financial maritime entities)
+25Flag jurisdiction KY — Tier 3 — Opaque
+10No public beneficial-ownership record on a flag-of-convenience register
Recent Port Calls (AIS)
No AIS port-call data captured for Madame Gu in the last 180 days. Sanctioned vessels frequently transmit AIS irregularly or disable transponders entirely — this absence is itself a vetting signal documented in the OFAC, EU, and IMO sanctions evasion advisories.
Flag State Risk Analysis: Cayman Islands
White ListKY
Madame Gu flies the Cayman Islands flag, which records a Paris MoU 3-year detention rate of 1.4% (White List) and a Tokyo MoU rate of 1.1% (White List). Worst-list placement: White List.
Live Sanctions Screening
Sanctions
RED
2 confirmed matches on vessel identifier.
Ownership Opacity
70
HIGH OPACITY
0 = transparent · 100 = opaque
Vetting Grade
E
Score: 90/100
unacceptable
Weekly snapshot · as of 2026-07-12
As of 2026-07-12
Request the reviewed intelligence dossier
Ownership chain details, sanctions match evidence, PSC detention records, and PDF report after manual review for Madame Gu.
Frequently Asked Questions
Is Madame Gu (IMO 1011331) sanctioned?
Madame Gu appears in the following sanctions-related databases: OFAC SDN. Use the live screening tool above for the most current status, as sanctions lists are updated frequently.
What is IMO number 1011331?
IMO 1011331 is the International Maritime Organization identification number permanently assigned to Madame Gu. IMO numbers are unique 7-digit identifiers that remain with a vessel throughout its lifetime, regardless of changes in name, flag, or ownership. They are the primary identifier used in sanctions screening, port state control, and maritime compliance.
How is the vessel vetting grade calculated?
ArcNautical's vetting grade (A through E) is a composite score based on five weighted factors: PSC detention history (30%), flag state performance (25%), ownership transparency (20%), vessel age (15%), and inspection recency (10%). Data is sourced from Paris MOU, Tokyo MOU, GLEIF corporate registry, and OFAC/EU/UN sanctions databases.