Amazon.com Inc. has disclosed that it held 854,207 shares of quantum-computing developer IonQ Inc. at the end of the second quarter, according to its latest 13F filing with the U.S. Securities and Exchange Commission. The position compares with roughly 1.93 million IonQ shares reported three months earlier, indicating the retailer and cloud-services provider cut its exposure during the period. The quarterly filing, released 5 Aug., also showed Amazon continuing investments in chipmaker Advanced Micro Devices, data-infrastructure specialist Marvell Technology and electric-vehicle maker Rivian Automotive, along with smaller stakes in Nautilus Biotechnology, Owlet, Vital Farms and SmartRent. Large investors with at least $100 million in assets are required to detail U.S. equity holdings within 45 days of each quarter-end, giving a partial view of how portfolios shift over time.