# Microsoft founding date

entity: /record/microsoft.md  
predicate: founded  
page: /record/microsoft/founded  
as_of: 2026-11-01  

As of November 1, 2026, Microsoft's founding date on the AsOf record is April 4, 1975, dated April 4, 1975, from 2 primary sources (sec.gov and news.microsoft.com) and 2 further sources (theverge.com and history.com). The record holds 1 claim on Microsoft's founding date, 1 still open and 0 superseded, each dated and sourced; a replaced value is closed with an end date, never deleted.

## Current founding date

What the record asserts on 2026-11-01.

- [Microsoft](/record/microsoft.md) | founded | 1975-04-04 | valid 1975-04-04 to present | conf 0.95 | valid | [clm_B979F23293B4](/claim/clm_B979F23293B4.md)
  sources: https://www.theverge.com/news/643251/microsoft-50-years-old-anniversary, https://www.wikidata.org/wiki/Q2283, https://www.sec.gov/Archives/edgar/data/789019/000156459018019062/msft-10k_20180630.htm, https://www.history.com/this-day-in-history/april-4/microsoft-founded, https://news.microsoft.com/es-es/2015/04/06/historia-microsoft-40-aniversario/

## Every dated value

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 Superseded claims stay visible.

- [Microsoft](/record/microsoft.md) | founded | 1975-04-04 | valid 1975-04-04 to present | conf 0.95 | valid | [clm_B979F23293B4](/claim/clm_B979F23293B4.md)
  sources: https://www.theverge.com/news/643251/microsoft-50-years-old-anniversary, https://www.wikidata.org/wiki/Q2283, https://www.sec.gov/Archives/edgar/data/789019/000156459018019062/msft-10k_20180630.htm, https://www.history.com/this-day-in-history/april-4/microsoft-founded, https://news.microsoft.com/es-es/2015/04/06/historia-microsoft-40-aniversario/

## Questions this record answers

### What is Microsoft's current founding date?

April 4, 1975, dated April 4, 1975, from 2 primary sources (sec.gov and news.microsoft.com) and 2 further sources (theverge.com and history.com). The record asserts this claim as of November 1, 2026 (status valid, confidence 0.95).


## Get this data

- JSON: /v1/entities/microsoft/founded (this fact) · /v1/entities/microsoft?predicates=founded (with the entity's coverage; add as_of=YYYY-MM-DD for a date)
- MCP: entity_state(entity: "microsoft", predicates: ["founded"], scope: "all")
- Entity twin: /record/microsoft.md · timeline: /timelines/microsoft.md

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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.