SoftBank wipes out 5.6 trillion yen in a single day: How does the OpenAI IPO delay spark a chain reaction across the AI ecosystem?

In the last trading week of June 2026, the global AI investment landscape experienced a severe shock. The trigger was not complicated—OpenAI was reportedly postponing its initial public offering (IPO) plan from 2026 to 2027. But the magnitude of this shock far exceeded what a single event should have caused.

On June 26, SoftBank Group (9984.T) shares plunged more than 14% intraday, eventually closing down 12.53%, with a single-day market cap loss of nearly 5.6 trillion yen (approximately $38 billion). On June 29 during Asian trading hours, the stock continued to fall over 6%, breaking below the 6,000 yen mark to close at 5,848 yen. The two-day cumulative decline exceeded 17%, sending the stock to its lowest level in over a month.

On the same day, the crypto market also came under pressure. Bitcoin fell below the $60,000 mark to $59,356, down over 1% in 24 hours, hitting an intraday low of $58,888; Ethereum dropped below $1,550. The total market cap of global crypto assets fell to approximately $2.15 trillion. AI-themed tokens weakened across the board.

This is not an isolated market correction, but a structural fragility exposed by a stress test on a highly coupled AI investment network. This article will deconstruct the deep logic behind this shock from three dimensions.

OpenAI IPO Delay: A Chain Reaction in Valuation Logic

Micro-Level Reasons for the Delay

OpenAI’s IPO delay is not due to a deterioration in the company’s fundamentals, but a cyclical mismatch in capital markets. According to the New York Times, OpenAI CEO Sam Altman insisted on a $1 trillion valuation target for the IPO. Previously, OpenAI completed a new funding round in early 2026, raising $122 billion and achieving a post-money valuation of $852 billion. From $852 billion to $1 trillion, the gap is about 17%—not insurmountable in a market environment with abundant growth narratives.

But the market environment has changed. Elon Musk’s SpaceX completed the largest IPO in history in June 2026, raising over $85 billion, with a first-day valuation of $1.77 trillion. Since then, SpaceX’s stock has continued to decline, falling from a high of $225.6 to Thursday’s close of $153, a drop of over 30%. This trend sent a clear signal to the market: even for top-tier tech assets, valuation revaluation in the secondary market can be brutal.

Based on this, OpenAI’s banking advisors proposed two paths: either postpone the IPO to 2027 to aim for a trillion-dollar valuation, or lower the target valuation and accelerate the IPO process. Altman explicitly rejected the latter.

The business logic behind this decision is understandable—trade time for valuation space. But for SoftBank, which holds about 11% of OpenAI and has invested over $60 billion cumulatively, this means a systemic delay in the liquidity realization node.

SoftBank’s AI Holdings Map: The Overlay Effect of Three Exposures

To understand why SoftBank’s decline was so severe, one needs to deconstruct its AI holdings structure.

Layer 1: Direct Holdings—Core OpenAI Exposure. As of the end of March 2026, SoftBank’s cumulative investment in OpenAI was $34.6 billion. On April 1, 2026, SoftBank executed the first $10 billion follow-on investment. The market expects SoftBank’s total investment in OpenAI to reach approximately $65 billion by October 2026. This amount is equivalent to 28% of SoftBank’s current market cap (about 35 trillion yen, or roughly $230 billion). The delay of OpenAI’s IPO directly locks the exit channel for these tens of billions in investments.

Layer 2: Indirect Holdings—Strategic Linkage with Arm. Arm is SoftBank’s most core listed asset and the global monopolist of AI chip instruction set architecture. Arm’s valuation is highly dependent on the sustained expansion of AI computing demand. The delay of OpenAI’s IPO and its potential slowdown in capital expenditure mean that the AI chip demand curve may be repriced. The simultaneous pressure on Arm’s stock will transmit through both SoftBank’s consolidated financial statements and its market cap holdings.

Layer 3: Extended Exposure—Ecosystem Binding with Oracle and CoreWeave. This is the dimension that the market may not have fully priced in during this shock.

Oracle/CoreWeave Triangular Dependency: The Overlooked Linkage Risk

SoftBank, Oracle, and CoreWeave form a classic "triangular dependency" structure.

In January 2025, OpenAI, Oracle, and SoftBank jointly announced the "Stargate Project," committing to invest $500 billion over the next four years in US AI infrastructure. The essence of this plan is a three-party division of labor: OpenAI provides models and algorithms (demand side), Oracle provides cloud computing and database infrastructure (compute supply side), and SoftBank provides capital and Arm’s chip architecture (underlying technology side).

CoreWeave is a more subtle part of this triangular structure. As a GPU cloud service provider focused on AI computing, CoreWeave is a key recipient of OpenAI’s computing needs, while also relying on Oracle’s cloud network and SoftBank’s capital support. These three companies form a closed loop of "capital—compute—model."

The fragility of this closed loop lies in the fact that any change in the pace of one node will trigger a revaluation of the other nodes.

OpenAI’s IPO postponement first implies that its capital expenditure pace may slow—there is no need to maintain extreme expansion speed to support a pre-IPO growth narrative. This directly impacts the incremental expectations for Oracle’s cloud business and the growth rate of CoreWeave’s GPU computing rental demand. The valuation pullbacks of Oracle and CoreWeave will then create a second-round shock through SoftBank’s indirect exposure (via Vision Fund’s portfolio).

The market’s sell-off of SoftBank on June 26 is essentially a systemic discounting of this "triangular dependency" structure.

Vision Fund 3 Valuation Restructuring: The Math Behind Unlisted Company Discounts

The most profound impact of this shock may be the systemic restructuring of Vision Fund 3’s valuation methodology.

SoftBank Vision Fund’s operating model heavily relies on "comparable company valuation"—when valuing unlisted AI companies, it references the market cap multiples of listed AI companies. When the largest holding, OpenAI, has its listing timeline significantly delayed, the anchor point of the entire valuation chain shifts.

Specifically:

First, liquidity discount expands. Unlisted assets inherently have a liquidity discount relative to listed assets. The IPO delay means this discount period is lengthened, and the discount rate should increase. If the market adjusts OpenAI’s listing expectation from "6-12 months" to "12-24 months," the liquidity discount may expand from the current 15-20% to 30-40%.

Second, exit path uncertainty premium increases. OpenAI’s IPO delay is not due to company issues but unfavorable market conditions. However, "market conditions" themselves are an uncontrollable variable. If the market environment in 2027 is also unfavorable? This uncertainty itself requires a risk premium.

Third, reverse amplification of leverage effects. SoftBank uses leverage via Vision Fund for investments. In an asset price upcycle, leverage amplifies gains; in a valuation restructuring cycle, leverage also amplifies losses. When the book valuation of OpenAI needs to be marked down, Vision Fund’s net asset value will contract by a multiple.

The overlay of these three effects explains why a single news of an IPO delay could cause SoftBank’s market cap to evaporate by over 17%—the market is not pricing "a six-month delay," but "a reset of the entire valuation framework."

The Synchronous Feedback in the Crypto Market: Cross-Asset Risk Appetite Contagion

The simultaneous weakness in the crypto market on June 29 is not a simple coincidence.

Bitcoin fell below the $60,000 mark, Ethereum dropped below $1,550, and SOL briefly fell below $70. The total market cap of global crypto assets is $2.15 trillion. The Fear and Greed Index dropped to 12, in the "extreme fear" zone.

This movement, along with the sell-off in traditional AI tech stocks, formed a cross-asset risk appetite contagion. The correlation between the crypto market and AI concept stocks has significantly increased in 2025-2026, with at least three transmission channels:

First, the liquidity expectation channel. The AI investment boom was an important narrative supporting the rise in global risk assets in 2025-2026. When the core target of this narrative (OpenAI) encountered an IPO hurdle, market doubts about "the sustainability of AI capital expenditure" lowered overall risk appetite, with crypto assets as high-beta assets bearing the brunt.

Second, the capital allocation channel. Some institutional funds allocate between AI concept stocks and crypto assets. When AI concept stocks are sold off, these funds may simultaneously reduce overall risk positions, rather than simply rotating between the two asset classes.

Third, the narrative linkage channel. AI and crypto share the long-term narrative of "technological disruption." When the market begins to question the short-term returns of AI investments, crypto’s "store of value" or "technology platform" narrative also faces re-examination.

From on-chain data, on June 29, BTC consolidated in a narrow range between $58,905 and $60,545, failing to reclaim the $60,000 mark. Technically, both the daily and 4-hour MACD have been in a bearish crossover below the zero line for some time, with the green histogram expanding and no bullish divergence pattern. This indicates that downward momentum has not been exhausted, and the market is in a typical "recovery repair followed by bearish continuation" rhythm.

Conclusion

SoftBank evaporating 5.6 trillion yen in a single day appears on the surface to be a shock from news of OpenAI’s IPO delay, but in essence, it is a systemic stress test conducted by the market on a highly coupled AI investment network.

The core feature of this network is that the dependencies among capital, compute, and models are not linear but have a multiplier effect. A disturbance at any node is amplified through three layers: direct holdings, indirect exposure, and ecosystem linkages. The OpenAI IPO delay impacts the first layer; Arm’s valuation linkage impacts the second; and the expectation adjustments for Oracle and CoreWeave impact the third. The overlay of these three layers constitutes SoftBank’s over 17% decline.

For market participants, the value of this event lies not in "how much more SoftBank will fall," but in revealing a deeper structural fact: as AI investment moves from "narrative-driven" to "delivery phase," the market’s scrutiny of valuation logic will become unprecedentedly strict. Companies that rely on "unrealized gains from unlisted assets" to support their market cap will face sustained valuation restructuring pressure.

The risk appetite linkage between the crypto market and AI concept stocks further expands the radiation range of this shock. In an environment where liquidity conditions have not significantly improved, cross-asset risk contagion may continue to ferment.

Key variables to watch next include: whether OpenAI will release any positive signals regarding its IPO timeline in the second half of 2026; how Vision Fund 3 adjusts its valuation method for unlisted assets in the next earnings season; and whether Oracle and CoreWeave’s capital expenditure plans will be adjusted due to the change in OpenAI’s pace. Any change in these three variables could trigger a new round of valuation restructuring.

FAQ

Q1: What is SoftBank’s actual investment size in OpenAI?

As of the end of March 2026, SoftBank’s cumulative investment in OpenAI was $34.6 billion. A $10 billion follow-on investment was executed in April 2026. The market expects total investment to reach about $65 billion by October 2026. SoftBank holds about 11% of OpenAI.

Q2: Why did OpenAI decide to postpone its IPO?

The core reason is a mismatch between market conditions and valuation targets. Sam Altman insisted on a $1 trillion IPO valuation, but recent volatility in tech stocks and SpaceX’s stock falling from $225.6 to $153 after its IPO led banking advisors to suggest postponing to 2027 to aim for a higher valuation.

Q3: What specifically does the Vision Fund 3 valuation restructuring refer to?

Vision Fund relies on "comparable company valuation" for unlisted AI companies. The delay of OpenAI’s IPO expands the liquidity discount, increases exit path uncertainty, and, combined with the reverse amplification of leverage effects, drives a systemic revaluation of Vision Fund’s net asset value.

Q4: Why was the crypto market affected by this event?

Through three main channels: the setback in the AI investment narrative lowering overall risk appetite; institutional funds simultaneously reducing risk positions; and the shared "technological disruption" narrative between AI and crypto leading to a concurrent review of valuation logic. On June 29, Bitcoin fell below $60,000 and Ethereum below $1,550, serving as evidence.

Q5: What key variables should be monitored next?

Three core observation variables: whether OpenAI releases positive signals about its IPO timeline in the second half of 2026; how Vision Fund 3 adjusts its valuation method for unlisted assets in the next earnings season; and whether Oracle and CoreWeave’s capital expenditure plans are adjusted due to changes in OpenAI’s pace.