Microsoft’s Anthropic Gain vs OpenAI Decline: A Quarterly Windfall and Year‑Long Balance

Microsoft reported a $3.2 billion gain on its Anthropic stake in the fiscal Q4, lifting diluted EPS by $0.33, while its OpenAI position slipped $600 million, trimming EPS by $0.07.

Anthropic’s Quarterly Windfall

The company disclosed the Anthropic investment as a $3.2B gain, boosting diluted EPS from $4.81 to a higher level.

■Microsoft invested $5B in Anthropic in November 2025 under a circular deal that also commits the lab to purchase $30B of Azure services.

■Although Microsoft does not routinely update the Anthropic valuation each quarter, it marked the investment up this period.

■The Anthropic gain accounts for over 10 % of the quarter’s $35.8B net income.

OpenAI’s Quarterly Decline

The OpenAI investment was written down $600M, cutting diluted EPS by $0.07. Microsoft holds roughly 27 % of OpenAI and receives revenue‑share payments, but does not detail those amounts.

■The $600 M write‑down represents just 1.7 % of the quarter’s $35.8B net income.

■Microsoft updates its OpenAI valuation each quarter, reporting this period’s decline.

■For the full fiscal year, Microsoft posted $331.8B in revenue and $133.7B in net income.

Annual Perspective and Strategic Insight

On a yearly basis, the OpenAI stake generated a $5B gain, adding $0.67 to EPS, with Microsoft’s annual EPS at $17.95.

■The single‑quarter $3.2B Anthropic gain approaches 64 % of the full‑year OpenAI gain.

■This contrast forces a reassessment of Microsoft’s short‑term AI tactical bets versus its long‑term partnership commitments.

■Analysts note that the divergence highlights shifting liquidity allocations and the evolving risk‑on/risk‑off dynamics influencing capital flows.

Microsoft’s $3.2B Anthropic gain in a single quarter showcases the upside of concentrated, risk‑on AI exposure, while the $600M OpenAI writedown underscores the volatility inherent in long‑term strategic holdings. Together, they illustrate how capital is being rotated between high‑conviction, short‑duration ventures and steadier, partnership‑based assets in today’s macro‑financial landscape.