Key Highlights

  • Cipher Digital (NASDAQ:CIFR) fell about 11.7% at midday on October 13, 2026 after announcing USD 850 million of zero-coupon convertible notes due 2032, one account says, as an AI data centre operator.
  • SentinelOne (NYSE:S) also fell on a USD 1.25 billion convertible offering the same day, two large convertible deals in AI infrastructure and cybersecurity, both reported and not confirmed.
  • A zero-coupon convertible pays no cash interest, and holders instead receive the right to convert into shares, which can dilute existing shareholders if the stock rises above the conversion price.
  • The 11.7% drop is a midday reading, so the closing move may differ, and the offering terms, conversion price and use of proceeds were not captured.

The Two Deals

Cipher Digital (NASDAQ:CIFR) announced USD 850 million of zero-coupon convertible notes due 2032 on October 13, 2026, and its shares were down about 11.7% at midday. The company is described as an AI data centre operator. Separately, SentinelOne announced a USD 1.25 billion convertible, and its shares also fell. Both are reported deals, and the conversion prices, interest terms, capped-call hedges and intended use of proceeds were not captured. Together they show how companies tied to AI spending are raising capital in the bond market while equity investors react to the dilution risk. The Cipher figure is a midday move, so the closing change may be different from the number cited here.

How Zero-Coupon Converts Work

A convertible note is debt that holders can swap for shares at a set conversion price. A zero-coupon version pays no regular interest, so the company saves cash now, and investors accept that in return for the equity option. If the stock rises above the conversion price, holders convert and existing shareholders are diluted. Issuers often buy capped calls to offset some dilution, and the hedging by buyers, who may short the stock when a deal prices, can push the share price down on the day. That mechanism helps explain why shares often fall on announcement even when the money raised funds growth, such as data-centre capacity or power contracts.

Risks and What to Watch

Debt that matures in 2032 gives time, but it adds leverage to a business with heavy capital needs. Investors should look for the final pricing, the conversion premium, any capped call, and how much of the cash goes to data-centre build-outs versus repaying debt. The company filing and the pricing announcement will set the numbers. A second risk is sector sentiment, since AI infrastructure names fell broadly on October 13. A third is that midday moves can reverse by the close. This article does not predict the stock and offers no price target, and the figures cited should be confirmed in the filing. Final terms may also change before closing.

Where Things Stand

The answer is dilution and leverage worry. Cipher Digital (NASDAQ:CIFR) fell about 11.7% at midday after USD 850 million of zero-coupon convertibles due 2032, and SentinelOne fell on a USD 1.25 billion deal the same day. Final terms were not captured, so the next filing matters most. This is not investment advice. The next steps are the pricing announcement, which should show the conversion premium and the size of any capped call, and the filing that describes how the money will be spent. Until those arrive, the share reaction is an estimate of dilution, not a measure of the business, and the midday figure may not match the close.