The most popular Ultra ETFs are with major index funds. Some examples
NASDAQ 100 Long, ticker QLD, which is 2x the long
NASDAQ 100 Short, ticker QID, which is 2x the short
Dow 30 Long, ticker DDM, 2x long
Dow 30 Short, ticker DXD, 2x short
S&P 500 Long, ticker SSO, 2x long
S&P 500...