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Among individual companies, Walmart surged 6.4 percent after unveiling a long-discussed membership program to provide free delivery and compete directly with Amazon's popular "Prime" service.

Amazon’s massive investment in its tech hubs over the last year bears that theory out. Here is a rundown of some of Amazon’s major moves:

Amazon’s San Diego presence dates back to 2016 and is led by Nate Wiger, who has spent six years with the company and worked on games, AWS and AmazonFresh. Wiger, who telecommuted from San Diego to Amazon’s Irvine office, convinced leadership to start up an office there using one of the famed “six-pagers,“a detailed memo read silently at the outset of an internal meeting. He emphasized University of California San Diego’s strong computer science program and a lower cost of living relative to other California cities.

Amazon’s Halo device works with a membership service with features including a tool that assesses the user’s tone of voice. (Amazon Photo)

Among the more than 300 foreign institutions with QFII licenses, only six had subscribed to the initial public offerings of the 28 firms listed on the STAR Market, including Goldman Sachs and Singaporean sovereign wealth fund GIC Private Ltd, according to financial information provider Wind Info.