U.S. grocery delivery app Instacart is considering going public through a direct listing, concerned that it could leave money on the table through a traditional initial public offering (IPO), according to people familiar with the matter. The move would make Instacart the latest company to snub an IPO, for decades the primary path to a stock market debut, because it risks pricing its offering too low compared to where its shares end up trading. In a direct listing, companies go public without raising money through a stock sale.