Ionq, INC Schedule 13D activist filings

Filed when an investor crosses five percent and intends to influence the company — the activist disclosure.

NYSE

2 Apr 2026

IONQ

SCHEDULE: IonQ Discloses 13.3% Stake in Horizon Quantum Holdings

Quantum computing firm IonQ has disclosed a significant 13.3% beneficial ownership stake in Horizon Quantum Holdings Ltd. following a strategic investment tied to Horizon's recent De-SPAC transaction.