Comment by mandelbrotwurst

Most (all?) retirement plans offer you some amount of choice in funds to invest in, and most companies of the sort you're describing are not included in many of the more popular indices. For example, WeWork was never in the S&P 500. Similarly, target date funds are one of the more popular investments options available as by default and/or recommendation in retirement plans. The first one I checked (Fidelity's Freedom Index) applies its U.S. allocation to large caps, which again means it does not include many of the companies you have in mind.