NEW YORK—Outsized bets on large U.S. technology companies and emerging cryptocurrencies fueled the year’s top-performing U.S. mutual fund and exchange-traded funds as the coronavirus pandemic upended global markets, while funds that bet on oil and gas companies fell nearly 100 percent, according to data from fund-tracker Morningstar. The year was a challenge like few others…

NEW YORK—Outsized bets on large U.S. technology companies and emerging cryptocurrencies fueled the year’s top-performing U.S. mutual fund and exchange-traded funds as the coronavirus pandemic upended global markets, while funds that bet on oil and gas companies fell nearly 100 percent, according to data from fund-tracker Morningstar. The year was a challenge like few others…