IonQ, Inc. (IONQ) Shareholders & Insider Trades
IonQ shareholders at a glance
The largest holder of IonQ stock is BlackRock Advisors LLC, with 18.0 million shares (4.44% of the company), worth about $708.00 million as of September 25, 2026. The 10 largest holders together own 21.7%.
In Q2 2026, 879 institutional holdings reports listed 226.0 million shares worth $11.10 billion, up 12.4% in shares from Q1 2026.
Insiders reported 71 transactions in the last two years: 33 sales worth $377.29 million and 2 purchases. The newest one on file is from May 6, 2026 (Cardillo Robert Thomas, Director).
Major holders as of September 25, 2026; quarterly totals from institutional holdings reports (latest Q2 2026); insider transactions on file through May 6, 2026.
IonQ, Inc.
Shareholders Summary
2026Q2
Ownership by Type
Geographic Distribution
Largest IonQ shareholders
| Holder | Shares | % of company | Value |
|---|---|---|---|
| BlackRock Advisors LLC | 18.0 million | 4.44% | $708.0M |
| Vanguard Capital Management LLC | 15.6 million | 3.85% | $613.0M |
| Vanguard Portfolio Management LLC | 14.0 million | 3.45% | $549.0M |
| State Street Corporation | 8.1 million | 2.00% | $319.0M |
| UBS Financial Services, Inc. | 7.7 million | 1.91% | $303.0M |
| Merrill Lynch International | 6.5 million | 1.60% | $254.0M |
| Geode Capital Management LLC | 6.5 million | 1.59% | $254.0M |
| Norges Bank (13F) | 5.2 million | 1.28% | $204.0M |
| Marex Financial | 3.7 million | 0.92% | $146.0M |
| Vanguard Fiduciary Trust Co. | 2.8 million | 0.70% | $111.0M |
As of September 25, 2026.
IonQ institutional holdings by quarter
| Quarter | Reports | Shares | Value |
|---|---|---|---|
| Q2 2026 | 879 | 226.0 million | $11.1B |
| Q1 2026 | 709 | 201.0 million | $5.8B |
| Q4 2025 | 755 | 194.0 million | $8.7B |
| Q3 2025 | 688 | 173.0 million | $10.5B |
| Q2 2025 | 550 | 137.0 million | $5.9B |
| Q1 2025 | 417 | 102.0 million | $2.3B |
| Q4 2024 | 430 | 87.6 million | $3.7B |
| Q3 2024 | 274 | 80.1 million | $686.0M |
Shares and value held by institutions that file quarterly holdings reports (options not included).
IonQ insider trades
| Insider | Date | Title | Transaction | Value |
|---|---|---|---|---|
| Cardillo Robert Thomas | May 6, 2026 | Director | Sale at price 49.90 per share. | $188,273 |
| Cardillo Robert Thomas | May 6, 2026 | Director | Conversion of Exercise of derivative security at price 11.24 per share. | $42,409 |
| Cardillo Robert Thomas | Apr 16, 2026 | Director | Sale at price 44.90 per share. | $112,250 |
| Cardillo Robert Thomas | Apr 16, 2026 | Director | Conversion of Exercise of derivative security at price 11.24 per share. | $28,100 |
| Raymond John W. | Mar 12, 2026 | Director | Sale at price 33.34 per share. | $93,352 |
| Cardillo Robert Thomas | Mar 2, 2026 | Director | Stock Award(Grant) at price 0.00 per share. | – |
| Teuber William J Jr | Feb 27, 2026 | Director | Purchase at price 38.38 per share. | $115,155 |
| Cardillo Robert Thomas | Feb 26, 2026 | Director | Sale at price 39.44 per share. | $203,685 |
| Cardillo Robert Thomas | Feb 26, 2026 | Director | Conversion of Exercise of derivative security at price 11.24 per share. | $28,100 |
| Toledano Gabrielle B | Feb 24, 2026 | Director | Sale at price 31.00 per share. | $19,096 |
| Dacier Paul T | Feb 20, 2026 | Officer | Stock Award(Grant) at price 0.00 per share. | – |
| De Masi Niccolo M | Feb 20, 2026 | Chief Executive Officer | Stock Award(Grant) at price 0.00 per share. | – |
Newest 12 of 71 insider transactions in the last two years.
Questions and answers
Who owns the most IonQ stock?
BlackRock Advisors LLC, with 4.44% of the company (as of September 25, 2026). Next: Vanguard Capital Management LLC (3.85%) and Vanguard Portfolio Management LLC (3.45%).
How many institutions own IonQ stock?
879 institutional holdings reports listed IonQ shares in Q2 2026, 226.0 million shares in all worth $11.10 billion.
Are IonQ insiders buying or selling the stock?
In the last two years insiders reported 33 sales and 2 purchases (71 transactions in all); the newest on file is from May 6, 2026.
