Amazon.com (AMZN) last week quietly disclosed a 1.46M share stake Nautilus Biotechnology (NAUT). When CNBC reported on stake today, shares of Nautilus jumped 47%, or $3.49, to $10.98. In a regulatory filing on July 28, showing its holdings as of June 30, Amazon disclosed owning 1.6M shares of Vital Farms (VITL), 14.3M shares of Air Transport Services Group (ASTG) and the new stake in Nautilus Biotechnology. Amazon declined comment to CNBC on whether it works with Nautilus, but its other two investments were in companies it does business with, Jordan Novet of the website points out. Nautilus says its mission is to “transform the field of proteomics by democratizing access to the proteome and enabling fundamental advancements across human health and medicine.”