SoftBank's Billion-Yen Retail Bond Arrives as Its AI Empire Shifts Toward Borrowed Money

SoftBank rebounds as bond markets steady, but record ¥1T retail bond sale and AI credit stress signal mounting capital pressure.

SoftBank Group's shares clawed back some ground on Thursday, rising 1.7 percent to €29.18 in European trading, a modest rebound that followed a stronger session in Tokyo. The relief came as bond markets steadied, but the underlying tension hasn't gone away: the Japanese conglomerate is preparing to sell its largest-ever retail bond to Japanese households at a moment when the cost of financing AI-linked credit is climbing.

The planned issuance — ¥1 trillion, roughly $6.26 billion, with a seven-year maturity — is aimed squarely at domestic retail investors. Proceeds are earmarked for acquisitions in "Physical AI," the latest chapter in Masayoshi Son's sprawling artificial-intelligence strategy. Terms are expected to be finalized in early September, according to Reuters and Nikkei reports from earlier this week. SoftBank itself said the reporting was not based on company disclosures, a denial that reads more procedural than substantive.

A Borrowing Machine Running Hot

The bond sale is only one layer of a rapidly stacking debt structure. In August, SoftBank took out a $10 billion loan secured against its own OpenAI stake. Pledging its most valuable AI asset while simultaneously courting retail bondholders suggests capital needs are outpacing what the company can generate internally.

The first-quarter results, released August 6, do little to counter that impression. Net income fell 18 percent to ¥347.33 billion. A ¥1.3 trillion valuation gain on the Intel stake propped up the headline number, but OpenAI contributed no mark-up, and operating profit declined. The earnings were widely characterized as supported by Intel and ByteDance gains rather than by underlying business momentum.

The Market's Mood Swings

The share price tells a story of its own. Thursday's bounce follows a brutal stretch: the stock fell 4.9 percent the previous day to close at €28.68, and the weekly loss stands at 8.1 percent. Over 30 days, the decline reaches 12 percent. Annualized volatility of roughly 74 percent underscores how jittery positioning has become.

That nervousness is partly a function of the AI credit complex. Credit default swaps on Nvidia bonds have surged past 80 basis points, up about 90 percent since the start of the year. Oracle's spreads blew out beyond 200 basis points in July, prompting S&P to leave the company just one notch above junk. AI-linked paper now accounts for up to 30 percent of new issuance in investment-grade indices — hardly an ideal window for SoftBank's record retail deal.

A measure of calm arrived Wednesday when the U.S. Treasury said it would double buybacks of long-dated government bonds. The 30-year yield, which had touched a 19-year high of 5.337 percent, fell roughly 9 basis points. That rippled into Asian equities: the Nikkei 225 gained more than 1 percent to 65,982 points, chipmaker Kioxia jumped as much as 5 percent, and SoftBank rallied up to 4 percent in Tokyo. The relief came after Japanese stock volatility hit an 18-year high on AI-driven trading and the Nikkei dropped 3 percent on Wednesday.

A Portfolio in Motion

SEC filings from August 14 reveal a notable reshuffle. SoftBank sold 71.5 percent of its Taiwan Semiconductor Manufacturing position — 1.4 million shares for $269.8 million — while building small new stakes in Capital One and Life360. The rotation out of an established semiconductor name into opportunistic positions suggests a portfolio manager prioritizing flexibility over conviction.

The Intel holding remains the centerpiece of the U.S. book. SoftBank still owns roughly 87 million shares, a position worth $12.1 billion at the end of June, up from $3.8 billion at the end of March. By August 19, that value had slipped to $8.4 billion, with Intel trading at $96.69. The stake still represents about 67 percent of SoftBank's total U.S. equity portfolio, which was valued at $18.2 billion on June 30. No new shares were purchased.

The Scale of the AI Bet

The numbers attached to SoftBank's infrastructure ambitions dwarf its market capitalization. Reuters reported that Nvidia will provide up to $105 billion in guarantee financing for an OpenAI data center in Ohio being developed by SB Energy, a SoftBank subsidiary. In June, SoftBank pledged up to €75 billion for new data centers at the Choose France summit. These are guarantees and commitments rather than equity outlays, but they illustrate the magnitude of what Son is trying to build.

On the operational front, there was at least one piece of encouraging news. SoftBank and Ericsson jointly validated an AI-native scheduler for link adaptation in SoftBank's commercial 5G network — a first for Japan. Spectral efficiency improved by up to 25 percent, and downlink throughput rose by up to 50 percent compared with conventional technology, with an average gain of 10 percent across all sites.

A Divergence That's Hard to Ignore

The central tension is now visible from almost any angle. Technological progress in the core business is real, but it's being financed through an increasingly complex web of debt — a record retail bond, a collateralized loan against the OpenAI stake, and a series of infrastructure guarantees that run into the hundreds of billions. The risk distribution between SoftBank, its creditors, and the Japanese households being asked to buy the new bond is shifting. For now, the weight of that shift appears to be landing on the retail investors.