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SoftBank piles on debt to fund its AI bets, with Arm shares as collateral

The group raised its margin loan against Arm and expanded a bank credit line on the same day, adding billions to the firepower behind its OpenAI stake.

Assembled by Claude from 11 sources at 10 outlets · Friday, September 18, 2026, Evening edition, 5:16 PM EDT · no human byline

Disclosure. This item was assembled by an AI from the RSS excerpts of the outlets tagged inline. No human wrote or checked it before publication. Feed selection and categories are editorial choices by Teresa Lo. Nothing here is investment advice.

What happened

SoftBank raised its margin loan secured against Arm to $25 billion as its artificial-intelligence bets grow bloomberg.comtheedgemarkets.com. It separately expanded a $6.05bn credit facility to $6.5bn with more than 20 banks thenextweb.com, a move Bloomberg framed as boosting the credit line as AI debts mount bloomberg.comfinance.yahoo.com. Taken together, the deals add $21 billion to the group's AI firepower m.economictimes.comground.news.

The pattern is a change in the shape of the borrowing as well as its size. By leveraging an appreciated asset, SoftBank's founder Masayoshi Son is systematically replacing short-term borrowing with longer-term debt streamlinefeed.co.ke. Ground News described Son as navigating increased financial pressure as the commitments accumulate ground.news. The credit facility was arranged with a syndicate rather than a single lender, drawing in more than 20 banks thenextweb.com.

Why it matters to investors

The borrowing funds a concentrated position. SoftBank is slated to invest close to $65 billion in OpenAI by October finance.yahoo.com. Benzinga put the figure at $64.6 billion and noted an investment of $30 billion earlier this year that represented a 13% ownership interest benzinga.com. The two accounts differ on the total by several hundred million dollars; both describe a single holding of a scale that dwarfs the credit line supporting it.

The collateral is the other concentration. The margin loan is secured against Arm, a listed chip designer whose share price determines how much the loan can support bloomberg.comstreamlinefeed.co.ke. Son needs billions of dollars to fund his growing AI investments, and SoftBank has been on an acquisition spree led by the OpenAI investment theedgemarkets.com.

What to watch

One exit route has already slipped. OpenAI's listing delay raises the stakes for SoftBank's $50bn data centre flotation, with the initial public offering of SB Energy set to test investor appetite for Son's AI gamble ft.com. SB Energy represents Son's core infrastructure bet on capturing surging AI demand, and the delay at OpenAI escalates the pressure on that listing to succeed tradingview.com.

Three markers follow. The first is the Arm share price, because the margin loan is sized against it bloomberg.com. The second is whether the October funding date for the OpenAI investment is met, given that the money is being raised through debt rather than held in cash finance.yahoo.com. The third is the reception for the SB Energy offering, which is now the nearest test of whether public markets will fund the infrastructure leg of the strategy ft.comtradingview.com.

Sources

  1. bloomberg.com: SoftBank Boosts Credit Line to $6.5 Billion as AI Debts Mount - Bloomberg.com (2026-09-18)
  2. thenextweb.com: SoftBank expands $6.05bn credit facility to $6.5bn with 20-plus banks - TNW (2026-09-18)
  3. bloomberg.com: SoftBank Raises Arm Margin Loan to $25 Billion as AI Bets Grow - Bloomberg.com (2026-09-18)
  4. theedgemarkets.com: SoftBank raises Arm margin loan to US$25 bil as AI bets grow - The Edge Malaysia (2026-09-18)
  5. m.economictimes.com: SoftBank adds $21 billion to AI firepower in new debt deals - The Economic Times (2026-09-18)
  6. ground.news: SoftBank Adds $21 Billion to AI Firepower in New Debt Deals - Ground News (2026-09-18)
  7. finance.yahoo.com: SoftBank Boosts Credit Line to $6.5 Billion as AI Debts Mount - Yahoo Finance (2026-09-18)
  8. benzinga.com: SoftBank Wants More Firepower For Its $64.6 Billion OpenAI Bet - Benzinga (2026-09-18)
  9. streamlinefeed.co.ke: SoftBank raises Arm margin loan to $25 billion to fuel aggressive AI investment | Streamline (2026-09-18)
  10. ft.com: OpenAI's listing delay raises stakes for SoftBank's $50bn data centre IPO - Financial Times (2026-09-18)
  11. tradingview.com: OpenAI IPO delay escalates pressure on SoftBank's $50B SB Energy listing - TradingView (2026-09-18)