Last week's surge in Treasury yields has mostly been discussed in terms of mortgages and Fed policy. A CNBC report published Sunday points to another place it's being felt: the companies borrowing heavily to build AI data centers.
What Yields Did Last Week
According to CNBC, the 10-year Treasury yield briefly reached 5.23% last week, its highest since June 2007. The 30-year yield touched 5.53%, and the 2-year topped 4.90% at one point. Edward Jones separately noted that the 10-year yield rose more than 0.4 percentage points in September, reaching its highest level since 2007.
Why This Matters for AI
A concrete example: CNBC reports that SoftBank, a major provider of capital for AI projects, raised $11.1 billion in a junk-bond sale last week, with yields as high as 9.75% on the 7-year portion. CNBC adds that companies have so far been willing to absorb the higher costs, but some investors are starting to worry about future financings.
| Metric | Figure | Source |
| 10-year Treasury yield, last week's peak | 5.23% (highest since June 2007) | CNBC |
| 30-year Treasury yield, last week's peak | 5.53% | CNBC |
| 2-year yield, topped | 4.90% | CNBC |
| JPMorgan estimate: AI-related debt through 2030 | $4.1 trillion | CNBC (JPMorgan, June) |
| SoftBank junk-bond sale | $11.1 billion, up to 9.75% (7-year) | CNBC |
| Microsoft, Friday | About +3.7% | Trading Economics |
Tech Stocks Held Up
Despite the yield spike, a CNBC headline from Saturday noted that Meta and Microsoft led tech stocks higher last week. Trading Economics reported that Microsoft gained about 3.7% on Friday after announcing plans to merge its consumer and workplace Copilot assistants into one product for corporate customers.
What This Means for Investors
"Tech" isn't one block. Companies that fund growth from their own cash flow and companies that depend on new borrowing feel higher rates differently. That's a general principle, not a call on any stock. If you hold a broad Nasdaq or tech fund, you own both kinds, so it's worth checking how much debt the largest holdings carry.
What to Watch Next
Micron reports earnings on Wednesday, September 30, according to Schwab's calendar, a useful read on AI-related chip demand. The September jobs report follows on Friday, October 2.
This post is for general informational purposes and isn't personalized investment advice. Please consult a licensed financial advisor before making investment decisions.

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