IonQ, Inc. (IONQ) Ownership
IONQ ownership summary
as of October 17, 2026- Institutions
- 47.0% of shares outstanding
- Insiders
- 0.66% of shares outstanding
- Shares outstanding
- 405.1M
- Float
- 378.2M shares available to trade
- Short interest
- 10.08% 40.6M shares short
- Days to cover
- 1.66 short interest down 1.0% vs prior month
- Institutions 46.97%
- Insiders 0.66%
- Other investors 52.37%
IONQ top institutional holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | Morgan Stanley - Brokerage Accounts | 6.49% | 26.3M | $822.0M | +5.1M (+24.2%) | June 30, 2026 |
| 2 | BlackRock Inc | 5.16% | 20.9M | $653.6M | −9.0M (−30.0%) | June 30, 2026 |
| 3 | Vanguard Capital Management, LLC | 3.85% | 15.6M | $487.9M | +534,498 (+3.5%) | June 30, 2026 |
| 4 | Vanguard Portfolio Management, LLC | 3.45% | 14.0M | $436.6M | −1.4M (−9.3%) | June 30, 2026 |
| 5 | State Street Corp | 2.01% | 8.1M | $254.1M | −1.1M (−12.4%) | June 30, 2026 |
| 6 | UBS Group AG | 1.95% | 7.9M | $247.0M | +2.1M (+36.0%) | June 30, 2026 |
| 7 | Bank of America Corp | 1.60% | 6.5M | $202.5M | +4.7M (+258.0%) | June 30, 2026 |
| 8 | Geode Capital Management, LLC | 1.59% | 6.5M | $202.1M | −2.0M (−23.5%) | June 30, 2026 |
| 9 | NORGES BANK | 1.28% | 5.2M | $162.3M | +737,143 (+16.6%) | June 30, 2026 |
| 10 | Marex Group Ltd | 0.92% | 3.7M | $116.0M | −298,301 (−7.4%) | June 30, 2026 |
| 11 | D. E. Shaw & Co LP | 0.66% | 2.7M | $84.2M | +789,594 (+41.5%) | June 30, 2026 |
| 12 | Charles Schwab Investment Management Inc | 0.58% | 2.4M | $74.1M | −532,400 (−18.3%) | June 30, 2026 |
| 13 | Vanguard Fiduciary Trust Co | 0.58% | 2.3M | $73.0M | −47,184 (−2.0%) | June 30, 2026 |
| 14 | Marshall Wace Asset Management Ltd | 0.57% | 2.3M | $72.8M | +2.3M (+24,926.1%) | June 30, 2026 |
| 15 | HRT FINANCIAL LLC | 0.55% | 2.2M | $69.8M | +769,900 (+52.6%) | June 30, 2026 |
| 16 | Northern Trust Corp | 0.55% | 2.2M | $69.1M | −1.0M (−31.7%) | June 30, 2026 |
| 17 | Bank of New York Mellon Corp | 0.53% | 2.1M | $66.9M | +322,513 (+17.8%) | June 30, 2026 |
| 18 | CANTOR FITZGERALD, L. P. | 0.53% | 2.1M | $66.9M | +1.1M (+98.4%) | June 30, 2026 |
| 19 | Jane Street Group LLC | 0.51% | 2.1M | $64.3M | +605,058 (+41.7%) | June 30, 2026 |
| 20 | Millennium Management LLC | 0.48% | 2.0M | $61.3M | +2.0M (0.0%) | June 30, 2026 |
Value at the latest close. Change = shares bought or sold in the latest quarterly filing (13F). In the top 20, 12 holders added 21.0M shares and 8 cut 15.4M.
IONQ top mutual fund and ETF holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | Vanguard MStar Total Stk Mkt Idx Invest | 2.98% | 12.1M | $377.3M | +556,253 (+4.8%) | August 31, 2026 |
| 2 | Vanguard Small Cap Index | 1.89% | 7.7M | $240.1M | +8,098 (+0.1%) | August 31, 2026 |
| 3 | Vanguard MStar Small Cap Growth Indx Inv | 1.09% | 4.4M | $137.9M | −37,967 (−0.9%) | August 31, 2026 |
| 4 | Vanguard Information Technology ETF | 0.76% | 3.1M | $95.9M | +6,963 (+0.2%) | August 31, 2026 |
| 5 | Morgan Stanley Inst Growth I | 0.75% | 3.0M | $94.9M | +449,333 (+17.4%) | June 30, 2026 |
| 6 | MS INVF US Growth I | 0.55% | 2.2M | $70.1M | +269,740 (+13.7%) | June 30, 2026 |
| 7 | State Street® SPDR® S&P® Smcndctr ETF | 0.47% | 1.9M | $59.2M | +8,025 (+0.4%) | September 30, 2026 |
| 8 | Fidelity Extended Market Index | 0.47% | 1.9M | $59.1M | +38,806 (+2.1%) | August 31, 2026 |
| 9 | VanEck Quantum Cmptg ETF A USD Acc | 0.46% | 1.9M | $58.2M | — | September 30, 2026 |
| 10 | iShares Russell Mid-Cap ETF | 0.39% | 1.6M | $49.7M | +2,926 (+0.2%) | September 30, 2026 |
| 11 | Fidelity Mid Cap Index | 0.37% | 1.5M | $46.3M | +80,905 (+5.8%) | August 31, 2026 |
| 12 | BrighthouseI Morgan Stanley Discovery B | 0.34% | 1.4M | $43.1M | +46,248 (+3.5%) | June 30, 2026 |
| 13 | Morgan Stanley Insight I | 0.32% | 1.3M | $41.2M | −4,160 (−0.3%) | June 30, 2026 |
| 14 | Schwab US Mid-Cap ETF™ | 0.30% | 1.2M | $38.0M | +1,296 (+0.1%) | September 30, 2026 |
| 15 | Defiance Quantum ETF | 0.28% | 1.2M | $36.1M | +6,164 (+0.5%) | September 30, 2026 |
| 16 | Transamerica Capital Growth A | 0.27% | 1.1M | $33.8M | — | August 31, 2026 |
| 17 | L&G Artificial Intelligence ETF | 0.24% | 967K | $30.3M | −2,389 (−0.2%) | September 30, 2026 |
| 18 | Morgan Stanley Inst Discovery I | 0.22% | 907K | $28.4M | +11,933 (+1.3%) | June 30, 2026 |
| 19 | iShares Russell 1000 Value ETF | 0.21% | 849K | $26.6M | −1,300 (−0.2%) | September 30, 2026 |
| 20 | Fidelity Total Market Index | 0.18% | 738K | $23.1M | +26,535 (+3.7%) | August 31, 2026 |
Funds report holdings monthly or quarterly; dates differ by fund.
IONQ insider transactions
latest 20| Date | Name | Transaction | Price | Shares | Value |
|---|---|---|---|---|---|
| 2026-03-18 | W. Gregory Steube | Buy | $32.39 | — | — |
| 2026-03-12 | John W Raymond | Sell | $33.34 | 2,800 | $93,352 |
| 2026-02-27 | William J Teuber Jr | Buy | $38.38 | 3,000 | $115,140 |
| 2026-02-26 | Robert T Cardillo | Sell | $39.44 | 5,165 | $203,708 |
| 2026-02-24 | Gabrielle B Toledano | Sell | $31.00 | 616 | $19,096 |
| 2025-12-22 | Kathryn K Chou | Sell | $55.00 | 5,000 | $275,000 |
| 2025-12-11 | Kathryn K Chou | Sell | $51.40 | 20,000 | $1.0M |
| 2025-11-20 | Rima Alameddine | Sell | $46.89 | 100,000 | $4.7M |
| 2025-11-11 | William J Teuber Jr | Buy | $54.81 | 2,000 | $109,620 |
| 2025-09-12 | Robert T Cardillo | Sell | $50.52 | 8,773 | $443,212 |
| 2025-09-11 | Masi Niccolo De | Sell | $44.40 | 16,120 | $715,728 |
| 2025-09-11 | Paul T Dacier | Sell | $44.40 | 4,175 | $185,370 |
| 2025-09-11 | Rima Alameddine | Sell | $44.40 | 19,976 | $886,934 |
| 2025-09-03 | Thomas G Kramer | Sell | $41.82 | 64,578 | $2.7M |
| 2025-08-06 | Thomas G Kramer | Sell | $41.28 | 17,776 | $733,793 |
| 2025-07-21 | Thomas G Kramer | Sell | $47.70 | 47,478 | $2.3M |
| 2025-07-11 | Kathryn K Chou | Sell | $43.14 | 6,789 | $292,877 |
| 2025-07-08 | Thomas G Kramer | Sell | $47.73 | 43,382 | $2.1M |
| 2025-07-07 | Rima Alameddine | Sell | $46.18 | 45,000 | $2.1M |
| 2025-07-07 | Kathryn K Chou | Sell | $46.18 | 5,000 | $230,900 |
Reported trades by company officers, directors and other filers (including disclosures by members of Congress where EODHD lists them). "—" where the filing gives no share count.
IONQ shares outstanding
Year-end shares outstanding, adjusted for splits.
Who owns IONQ
Institutional investors own 47.0% of IonQ's shares and insiders 0.66%. The largest holder is Morgan Stanley - Brokerage Accounts with 6.49% of the shares (26.3M), as of June 30, 2026. Among the top 20 institutions, 12 added shares and 8 reduced their stake in the latest filings. Short interest is 10.08% of the float, or 1.66 days of average trading volume. The share count rose 91.7% since 2020.
Related: IONQ analyst forecast, IONQ key metrics. See the IONQ stock overview for the latest quote and news.
IONQ ownership FAQ
Who owns the most IonQ stock?
The largest shareholders of IonQ are Morgan Stanley - Brokerage Accounts (6.49%), BlackRock Inc (5.16%), Vanguard Capital Management, LLC (3.85%), Vanguard Portfolio Management, LLC (3.45%), State Street Corp (2.01%).
What percentage of IonQ is owned by institutions?
Institutions hold 47.0% of IonQ's shares outstanding; insiders hold 0.66%.
Which funds own IonQ?
The largest fund holders of IonQ are Vanguard MStar Total Stk Mkt Idx Invest (2.98%), Vanguard Small Cap Index (1.89%), Vanguard MStar Small Cap Growth Indx Inv (1.09%), Vanguard Information Technology ETF (0.76%), Morgan Stanley Inst Growth I (0.75%).
What is IonQ's short interest?
40.6M shares of IonQ were sold short, 10.08% of the float; at the average daily volume it would take 1.66 days to cover.
Are insiders buying or selling IonQ?
Of the latest 20 reported insider transactions in IonQ (since July 7, 2025), 3 were purchases and 17 were sales.
How many shares of IonQ are outstanding?
IonQ has 405.1M shares outstanding, of which 378.2M are in the public float.