Instacart is reportedly planning to go public in September, and though public markets haven't been kind to gig economy companies, Instacart may be different. It has already achieved GAAP net income on its ad business, and is building up a leadership team of advertising heavyweights. Plus, Softbank’s chip designer Arm could also file its prospectus next week, in what would be 2023’s largest IPO and another big boost for U.S. listings.