SoftBank Borrows $10 Billion Against OpenAI Stake, Exposing Margin Call Risk If Valuation Drops
Alina Collins
SoftBank completed a $10 billion loan this week using its OpenAI stake as collateral — filings reveal a sharp drop in valuation would trigger margin calls, effectively tying SoftBank's balance sheet to OpenAI's worth.
Where did the $10 billion come from?
SoftBank pledged its OpenAI equity as collateral for a $10 billion loan, settled Wednesday and disclosed Thursday.
Including this deal, SoftBank has funneled a total of $54.6 billion into OpenAI through loans and asset sales.
This means → SoftBank's cumulative bet on OpenAI now exceeds the market cap of most listed tech firms — extreme concentration by any measure.
What happens if the valuation drops — what does "margin call" mean here?
Filings show that if the "fair value" of OpenAI's equity falls sharply, SoftBank must post additional cash.
In plain terms = it works like leveraged stock trading — when the asset drops below a threshold, the bank demands more money; fail to pay and the position is forcibly sold.
The deeper danger is a feedback loop: forced sales of OpenAI shares → selling pressure pushes the valuation lower → more margin calls triggered, creating a downward spiral.
Another $10 billion due in October — where will the money come from?
SoftBank has committed to injecting another $10 billion into OpenAI by October.
The Information's analysis suggests SoftBank will most likely pledge its OpenAI stake again to fund this round.
This means → the same asset gets mortgaged repeatedly, stacking leverage — any valuation pullback would multiply the exposure.
Is there a safety cushion?
SoftBank estimates that as of June 30, its OpenAI stake had appreciated roughly $45 billion above cost, providing some buffer.
But tech stocks have historically reversed gains of comparable magnitude, making the margin-call scenario more than theoretical.
This reflects Masayoshi Son's well-known appetite for risk — except this time he has locked SoftBank's balance sheet to the valuation of a single unlisted company. Whether OpenAI can sustain its current valuation is now the pivotal variable for the entire strategy.
Content is for reference only, not financial advice.