221B Master Fund LP

221B Master Fund LP is an investment fund structure domiciled in George Town, Cayman Islands. Funds hold LEIs in their own right, and GLEIF records who manages them rather than who owns them.

The LEI has been on record for 2 years, since 20 Dec 2023. That is about 5 years later than the median LEI in Cayman Islands (2019).

The next annual re-validation is due 20 Nov 2026, 33 days from now.

This archive holds 2 versions of the record. The most recent change was on 27 Sep 2026 and altered the hq address; the oldest version we hold dates from 6 Jul 2026. GLEIF publishes only the current state, so superseded values are not available from the source.

The entity is registered with Registry of Companies under registry number MC-125250, and the LEI itself is issued and maintained by Bloomberg Finance L.P., one of the Local Operating Units accredited by GLEIF.

No direct accounting-consolidating parent is reported, because no parent prepares consolidated accounts that include it. GLEIF requires this to be stated explicitly rather than left blank, so the absence is itself a data point.

No ultimate accounting-consolidating parent is reported, because no parent prepares consolidated accounts that include it. GLEIF requires this to be stated explicitly rather than left blank, so the absence is itself a data point.

The LEI registration is issued, and the entity status (active) records whether the legal entity itself still exists. The two are independent: an LEI can lapse while the company trades on, and it can stay issued after the company has been dissolved.