Meanwhile, in a letter publicly released Thursday, Democratic Senators Elizabeth Warren of Massachusetts and Tina Smith of Minnesota asked Fidelity Investments CEO Abigail Johnson to explain why the company “ignored” the Department of Labor’s warning when it announced in late April it would soon include a Bitcoin option in 401(k) offerings and already had one employer signed up.  “Investing in cryptocurrencies is a risky and speculative gamble, and we are concerned that Fidelity would take these risks with millions of Americans’ retirement savings,” the senators wrote in the letter to Johnson, questioning whether there are conflicts of interest related to Fidelity’s past Bitcoin and Ethereum mining activities, among other things.  Bitcoin, the best known cryptocurrency, has gone on a wild ride over the past year, more than doubling in value between July and November—when it reached an all-time high of almost $69,000—and then losing about 46% of its value since. The volatility is one reason the investments aren’t widely available in 401(k) plans. Only 1.6% of plan providers surveyed after the Labor Department’s warning said they were still considering crypto as a plan option, while another 1.6% said they had been considering it as an option until they heard about the warning. Besides Fidelity’s upcoming offering, retirement plan manager ForUsAll announced a cryptocurrency option last June.   Have a question, comment, or story to share? You can reach Terry at tlane@thebalance.com. Want to read more content like this? Sign up for The Balance’s newsletter for daily insights, analysis, and financial tips, all delivered straight to your inbox every morning!