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Graphic showing IonQ acquiring cybersecurity firm Elisity
Photo: The Quantum Insider

IonQ Stock Falls 9% After $1.3B Elisity Acquisition

IonQ Investor Relations2 min read5 sources

Why is IonQ stock down today?

IonQ (IONQ) stock fell 9% to $36.19 on Monday after announcing a $1.3 billion all-stock deal for Elisity, a cybersecurity acquisition investors fear will dilute their shares.

Key numbers

Deal value (all stock)Up to $1.3BIncludes up to $150M earnout
IonQ share price$36.19-9% vs $39.89 Friday close
IonQ 2026 year to date-19%Down more than 50% in 12 months (per [3])
Share price range in deal formula$33.07–$49.61Set by 20-day average before closing
Premarket move on WSJ report-2%Before the official announcement (per [5])

What happened

IonQ (IONQ) stock fell 9% to $36.19 on Monday after announcing a $1.3 billion all-stock deal for Elisity, a cybersecurity acquisition investors fear will dilute their shares. IonQ is paying with its own shares instead of cash, and up to $150 million of the price depends on how Elisity performs later. Elisity makes security software that limits which people and devices can reach a company's networks, an approach called Zero Trust. The Wall Street Journal reported the deal first, and it is expected to close in the fourth quarter of 2026.

Why it matters

IonQ, a quantum computing company, is using this deal to expand into selling security software to businesses and governments. Because it pays in shares, IonQ will have more shares outstanding, so each existing shareholder owns a slightly smaller slice (called dilution). The stock fell by more than the deal's price tag, which suggests many investors doubt the purchase will pay off.

Who this affects

Marketbearish
Medium impact
Quantum stocks fell together as traders weighed dilution risk.
Companybearish
Medium impact
IonQ shareholders face dilution and unproven returns from the deal.
Competitorsbearish
Low impact
D-Wave and Rigetti slid about 4% in sympathy.
Industryneutral
Medium impact
Quantum firms are widening into security, a growing field.

IonQ vs D-Wave Quantum, Rigetti Computing

IonQIONQ$36.19-9%-19%
D-Wave QuantumQBTS$13.99-4%—
Rigetti ComputingRGTI$13.44-4%—

As of 2026-10-12

How we got here

  1. IonQ closes Friday at $39.89 before the deal news.

  2. WSJ reports the Elisity deal; IonQ trades down about 2% premarket.

  3. IonQ confirms a definitive agreement to buy Elisity in an all-stock deal.

  4. IonQ shares slide about 9% to $36.19; D-Wave and Rigetti fall 4%.

What to watch

  • Regulatory approval and closing of the Elisity deal, which IonQ expects in the fourth quarter.Q4 2026
  • Final IonQ share count, set by a 20-day average price between $33.07 and $49.61.Q4 2026
  • Whether IonQ discloses Elisity's revenue, which has not been shared so far.Q4 2026

Educational content only. Not investment advice.

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