IonQ, Inc. (IONQ) Institutional Ownership

Ownership Summary

The institutional landscape for IonQ, Inc. (NYSE:IONQ) includes 270 filers as of the latest reporting cycle ending December 2025.

• Institutional ownership in IonQ edged down to 15.5% in December 2025, compared to 60.3% in September 2025.
• In percentage terms, this reflects as a holdings change of 20.56% quarter on quarter, and a decrease of 27.42% year over year.
• Among the 270 institutional holders of IonQ, 175 added to their stakes while 56 trimmed their positions and 39 held steady.
• The total number of shares held by institutions in IonQ increased to 45.74Mn as of December 2025, a net change of up by 7.80Mn shares quarter on quarter, and down 45.40Mn shares year over year.
• As of December 31, 2025, VANGUARD GROUP INC held IonQ's largest shareholding position with over 34.77Mn shares, representing 11.80% of total outstanding shares.
• Among the most significant buyers of IonQ during December 2025 were VANGUARD GROUP INC (5.42Mn), Sumitomo Mitsui Trust Group, Inc. (572.25K), NORTHWESTERN MUTUAL WEALTH MANAGEMENT CO (282.29K), Mitsubishi UFJ Asset Management Co., Ltd. (280.99K), Focus Financial Network, Inc. (171.75K).
• Leading sellers of IonQ stock in December 2025 included Universal- Beteiligungs- und Servicegesellschaft mbH (79.06K), Owen LaRue, LLC (67.62K), HAMILTON LANE ADVISORS LLC (65.00K), COMERICA BANK (52.84K), SG Americas Securities, LLC (29.50K).
• The top 10 institutional holders of IonQ for the quarter ending December 2025 included VANGUARD GROUP INC (34.77Mn), UBS Group AG (4.28Mn), Sumitomo Mitsui Trust Group, Inc. (572.25K), CAPITAL ADVISORS INC/OK (341.59K), Carnegie Investment Counsel (298.96K), NORTHWESTERN MUTUAL WEALTH MANAGEMENT CO (283.81K), Mitsubishi UFJ Asset Management Co., Ltd. (281.45K), SBI Securities Co., Ltd. (229.77K), BESSEMER GROUP INC (214.39K), HAMILTON LANE ADVISORS LLC (195.00K).