IonQ, Inc.
IonQ, Inc. (IONQ) Stock Ownership
Institutional vs insider vs public ownership from 13F and float data — top holders, activity, and insider trades below.
SEC 13F · FMP · IONQ · as of Sep 30, 2025
Ownership Breakdown
674
Institutional Holders
▲ 136 vs Q2
$10.34B
Total Inst. Value
▲ $4.64B vs Q2
373.27M
Shares Outstanding
freeFloat 98.29%
169.48M
13F Shares Held
▲ 36.87M vs Q2
Institutional ownership = 13F shares ÷ total outstanding. Insider % = 100 − free float. Public % = free float − institution %. Data: FMP /symbol-positions-summary + /shares-float + SEC EDGAR.
Top Institutional Holders
IONQ largest shareholders · institutional ownership
Q3 2025 · SEC 13F
Showing top 10 holders
| Holder | Shares | % Owned | Weight | Value | Reported | Change |
|---|---|---|---|---|---|---|
VANGUARD GROUP INC services-computer integrated systems design | 29.35M | 11.70% | 11.70% | $1.81T | Nov 7, 2025 | ▲ 4.59M |
MORGAN STANLEY services-computer integrated systems design | 26.34M | 10.50% | 10.50% | $1.62T | May 27, 2026 | ▲ 6.06M |
BLACKROCK, INC. services-computer integrated systems design | 22.48M | 8.96% | 8.96% | $1.38T | Nov 12, 2025 | ▲ 4.23M |
GEODE CAPITAL MANAGEMENT, LLC services-computer integrated systems design | 6.62M | 2.64% | 2.64% | $408.10B | Nov 12, 2025 | ▲ 1.28M |
STATE STREET CORP services-computer integrated systems design | 6.30M | 2.51% | 2.51% | $387.42B | Nov 14, 2025 | ▲ 1.04M |
D. E. SHAW & CO., INC. services-computer integrated systems design | 5.45M | 2.17% | 2.17% | $335.08B | Nov 14, 2025 | ▲ 1.41M |
RENAISSANCE TECHNOLOGIES LLC services-computer integrated systems design | 5.08M | 2.02% | 2.02% | $312.40B | Nov 13, 2025 | ▲ 4.07M |
SUSQUEHANNA INTERNATIONAL GROUP, LLP services-computer integrated systems design | 5.01M | 2.00% | 2.00% | $307.92B | Nov 14, 2025 | ▲ 3.13M |
UBS GROUP AG services-computer integrated systems design | 4.30M | 1.71% | 1.71% | $264.55B | Nov 13, 2025 | ▲ 663.3K |
SUSQUEHANNA INTERNATIONAL GROUP, LLP services-computer integrated systems design | 4.25M | 1.69% | 1.69% | $261.34B | Nov 14, 2025 | ▼ 2.11M |
Data from SEC Form 13F filings. Ownership bar normalised to largest holder. Change flags: isNew / isSoldOut / changeInSharesNumber (FMP extract-analytics/holder).
Institutional Activity
Q3 2025 vs prior quarter
Q3 2025
38
Increased
+43.33M shares6
New Positions
first time holders6
Decreased
−3.26M shares0
Sold Out
fully exitedNet shares change (top 50)
+40.07M
+43.33M / −3.26M
Net new holders
+38
6 new / 0 exited
Based on top 50 institutional holders by position size. Fields: isNew, isSoldOut, changeInSharesNumber (FMP extract-analytics/holder, limit=50).
Insider Buying vs Selling
IONQ insider trading · insider activity
Source: SEC Form 4
Insiders have been primarily selling shares recently. Selling may be driven by pre-scheduled Rule 10b5-1 plans rather than negative sentiment.
2
Buy transactions
1
Sell transactions
2.00
Buy/Sell ratio
$0M
Total disposed
Recent Insider Transactions
Showing 10 most recent · Common Stock only
| Name · Role | Date | Type | Shares | Price | Value | After Trans. | Filing |
|---|---|---|---|---|---|---|---|
Cardillo Robert T. Executive Chair, IonQ Federal | May 6, 2026 | Sale | 3,773 | $49.90 | $188.3K | 140.0K | Form 4 ↗ |
Cardillo Robert T. Executive Chair, IonQ Federal | Apr 16, 2026 | Sale | 2,500 | $44.90 | $112.3K | 140.0K | Form 4 ↗ |
Singh Inder M CFO & COO | Mar 11, 2026 | Tax Withhold | 8,134 | $34.80 | $283.1K | 423.8K | Form 4 ↗ |
DACIER PAUL T CAO, CLO and Secretary | Mar 11, 2026 | Tax Withhold | 6,181 | $34.80 | $215.1K | 108.6K | Form 4 ↗ |
Raymond John w Special Advisor | Mar 12, 2026 | Sale | 2,800 | $33.34 | $93.4K | 84.0K | Form 4 ↗ |
Cardillo Robert T. Executive Chair, IonQ Federal | Mar 11, 2026 | Tax Withhold | 904 | $34.80 | $31.5K | 140.0K | Form 4 ↗ |
de Masi Niccolo President and CEO | Mar 11, 2026 | Tax Withhold | 20,785 | $34.80 | $723.4K | 1.16M | Form 4 ↗ |
Cardillo Robert T. Executive Chair, IonQ Federal | Mar 2, 2026 | Award | 31,651 | — | — | 140.9K | Form 4 ↗ |
Cardillo Robert T. Executive Chair, IonQ Federal | Feb 26, 2026 | Sale | 5,165 | $39.44 | $203.7K | 112.3K | Form 4 ↗ |
Cardillo Robert T. Executive Chair, IonQ Federal | Feb 27, 2026 | Tax Withhold | 3,071 | $39.19 | $120.4K | 109.2K | Form 4 ↗ |
Source: /insider-trading/search (FMP stable). Buy/Sell direction: acquisitionOrDisposition A=Buy, D=Sell. RSU vesting (M-Exempt) excluded from sentiment bar. All data from SEC EDGAR public filings.
About institutional & insider ownership
IonQ, Inc. (IONQ) is primarily owned by institutional investors, who hold approximately 45.4% of total shares outstanding. Company insiders own approximately 1.71%, while retail and public investors account for the remaining 52.89%.
The largest institutional shareholder of IonQ, Inc. is VANGUARD GROUP INC, holding approximately 29.35 million shares — equal to 11.70% of outstanding shares — as of September 30, 2025.
A total of 674 institutional investors currently hold IONQ stock, with a combined institutional value of approximately $10.34 billion as of the most recent 13F filing period.
Frequently asked questions
IONQ ownershipIonQ, Inc. (IONQ) is primarily owned by institutional investors, who hold approximately 45.4% of shares. The largest shareholder is VANGUARD GROUP INC with a 11.70% stake. Company insiders hold 1.71%. Data sourced from SEC Form 13F as of September 30, 2025.