# Hamilton E. James

id: ent_hamilton-e-james  
wikidata: Q16149081  
kind: person  
timeline: /timelines/hamilton-e-james.md  
page: /record/hamilton-e-james  
same_as: https://asof.is/record/hamilton-e-james (how to cite the id: /identifiers.md)  

Hamilton E. James is an American businessperson. Founder and Chairman of Jefferson River Capital LLC. Former president and chief operating officer of The Blackstone Group. On the record, Hamilton E. James is Chair of Costco.

## Key facts

- Chair: Costco · claim: /claim/clm_ABDCD599FD37.md

## Questions

**What roles does Hamilton E. James hold?** Chair of Costco, as the AsOf record states with its sources.

**What is Hamilton E. James's role at Costco?** Chair.

## Fact pages

One page per fact: the current value with its sources, then every dated value and what replaced what. Fetch any of them as markdown.

- [Hamilton E. James chair roles](/record/hamilton-e-james/chair_of.md)

## Current state

What the record asserts: claims that held, valid by their sources or primary-sourced at confidence 0.7 or more. Unverified, disputed, retracted and review-marked claims are listed below, labelled, not here.

- [Hamilton E. James](/record/hamilton-e-james.md) | chair_of | [Costco](/record/costco.md) | valid undated to present | conf 0.95 | valid | [clm_0E2E445084F6](/claim/clm_0E2E445084F6.md)
  sources: https://www.sec.gov/Archives/edgar/data/909832/000090983226000093/cost-20260830.htm

## All claims

One claim per line, newest first. Superseded claims stay visible.

- [Hamilton E. James](/record/hamilton-e-james.md) | chair_of | [Costco](/record/costco.md) | valid undated to present | conf 0.95 | valid | [clm_0E2E445084F6](/claim/clm_0E2E445084F6.md)
  sources: https://www.sec.gov/Archives/edgar/data/909832/000090983226000093/cost-20260830.htm

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AsOf is a temporal fact ledger: a structured, dated, sourced record of what is true and what changed, built for AI retrieval.