Microsoft holds AI capex steady; stock surges as peers spend more

Microsoft CEO Satya Nadella announced on Wednesday's earnings call that the company would keep its capital expenditure forecast unchanged, a rare move in an industry where competitors are rapidly escalating AI spending. The stock surged about 8% on the news. Earlier in the year, Microsoft had guided investors toward $190 billion（約30兆円） in capital expenditures for the calendar year. On Wednesday, due to an accounting change, this guidance was relabeled as $175 billion（約28兆円）, but the substance remained the same—the company is keeping its AI capex plan steady in real terms.

Microsoft's restraint contrasts sharply with moves by other major cloud providers. Alphabet recently increased its capex projection by $15 billion（約2.4兆円）, and Tesla also raised its own projection; both companies' stocks fell sharply afterward as investors punished the higher spending plans. Meta narrowed its capex forecast range but raised the midpoint by $2.5 billion（約4000億円） for the year. The divergence reflects investor anxiety about whether the enormous sums being poured into AI data centers will generate returns. Wall Street has been watching closely during earnings season to see whether any major tech giant would signal a pullback on AI spending, and Microsoft appears to be the first to do so.

The broader context reveals why capex discipline matters. Google, Amazon, Microsoft, and Meta had already committed to spending more than $700 billion（約110兆円） this year largely on AI data centers. This spending surge has sent memory chip prices soaring, and because memory is a significant component of data center costs, those price increases have made it substantially more expensive to build AI capacity. Research found that soaring memory prices could explain about 45% of the growth in capex forecasts by the big cloud companies this year. This implies that much of the announced capex growth reflects higher per-unit costs rather than expanded buildout plans. By holding capex steady despite these cost pressures, Microsoft could actually be pulling back slightly from new capacity additions—a signal of measured confidence in its current infrastructure sufficiency.

Microsoft's decision to hold capex steady stands out because it breaks from the pattern of escalating AI infrastructure spending that has defined the industry this year. Alphabet, Tesla, and Meta all raised their capex projections recently, yet their stocks fell sharply on the news—a signal that Wall Street has begun penalizing aggressive spending plans. This investor reaction appears to reflect a broader concern: the returns on these massive infrastructure investments remain unclear, and the race to secure AI capacity may have outpaced genuine demand. By keeping its forecast constant, Microsoft appears to be betting that current infrastructure levels are sufficient and that further buildout carries diminishing returns.

A critical context: much of the capex growth announced by cloud giants this year stems not from new strategic plans but from rising memory chip costs. Research cited in the article found that soaring memory prices explain about 45% of capex growth among major cloud companies. This distinction matters because it suggests that headline capex increases may overstate actual new capacity being built. Microsoft's steady forecast, in this light, may signal the company is actually reducing net new capacity buildout while absorbing higher per-unit costs—a more disciplined posture than peers who are raising capex in tandem with those cost pressures.

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