SoftBank Group shares collapsed as much as 11.3% in Tokyo on Thursday, their steepest single-day drop of 2026, after a disappointing artificial intelligence revenue forecast from Broadcom triggered a global reassessment of semiconductor and AI valuations. The rout erased billions from Masayoshi Son’s fortune and stripped him of his status as Asia’s richest person, replacing one empire builder with another in a matter of hours.
The selling began in earnest following Broadcom’s second-quarter results and earnings call on June 3. The chipmaker projected third-quarter AI revenue of roughly $16 billion, a figure that fell short of elevated consensus estimates and offered no increase to full-year guidance. Investors had priced in relentless acceleration across the AI supply chain; when Broadcom signaled moderation, the repricing was swift and brutal. Broadcom’s own stock plunged on the miss, and the contagion spread immediately to Asian markets before Tokyo even opened.
By the close in Tokyo, SoftBank had settled down approximately 10%, dragging the Nikkei 225 lower by 1.36% to 67,470.69. The damage was hardly limited to Japan. Semiconductor names from Taipei to Seoul faced heavy pressure as traders questioned whether the generative AI build-out was approaching a near-term revenue plateau. For weeks, equity markets had treated any company with exposure to data-center silicon as a guaranteed winner. Thursday proved that assumption was fragile.
For SoftBank, the punishment was especially severe because Son has effectively turned the conglomerate into a leveraged proxy for AI sentiment. The company’s portfolio is anchored by Arm Holdings, whose chip architectures underpin virtually every major mobile processor and an expanding share of data-center silicon, and by a sprawling financial commitment to OpenAI that has raised fresh questions about near-term liquidity. Analysts have warned that SoftBank’s concentrated AI bets are reviving concerns over its mounting debt, particularly as the market shifts from narrative-driven enthusiasm to hard cash-flow scrutiny.
The wealth destruction was personal and immediate. Son’s net worth plummeted by more than $13 billion during the session, according to Forbes, handing Asia’s richest-person title to India’s Mukesh Ambani. The reversal is striking given that SoftBank shares had climbed roughly 70% year-to-date heading into the week, a rally built on the assumption that Son’s early and aggressive positioning in AI would translate into exponential returns before the end of the decade.
What changed between Wednesday and Thursday was not SoftBank’s strategy, but the market’s tolerance for speculative leverage. The broader semiconductor complex across Asia, from advanced packaging to high-bandwidth memory, is now being asked to prove that end-demand for AI infrastructure can match the capital expenditures that have flooded the sector over the past eighteen months. When Broadcom, a critical data-center networking and custom silicon supplier, failed to raise its annual outlook, it provided the first major crack in that assumption. If Broadcom cannot upgrade its forecast, the market reasoned, then perhaps the infrastructure build-out is not as open-ended as previously believed.
SoftBank’s structural vulnerability lies in its DNA as a holding company rather than an operating one. Unlike a pure-play chip designer or cloud provider, it carries significant debt while betting that its stakes in foundational AI assets will appreciate fast enough to cover liabilities and fund future commitments. That model works beautifully during momentum-driven rallies; it unwinds quickly when discount rates rise and growth multiples compress. There is no dividend cushion to break the fall, and buyback capacity is constrained by the very leverage that amplified the upside.
Thursday’s price action suggests investors are no longer willing to grant SoftBank a premium simply for proximity to the AI theme. The stock is now repricing toward a valuation that reflects both the real value of its Arm stake and the very real risks of its OpenAI financing obligations. Broader Asia tech weakness compounded the decline, but SoftBank’s drop outpaced the Nikkei by a wide margin, a clear signal that the market views its risk profile as uniquely elevated.
The immediate question for Son is whether this correction remains a valuation reset or morphs into a sustained deleveraging cycle. If major AI customers pause capital spending into 2027, Arm’s royalty growth could slow just as SoftBank needs it most to service obligations. Meanwhile, any delay in OpenAI’s path to profitability would strain the conglomerate’s balance sheet further. Thursday’s bloodletting did not solve those uncertainties; it simply forced the market to acknowledge that AI hype alone is no longer enough to justify a premium.
