The largest group of new products turns the original concept of ETFs upside down, providing exposure to just a single large-cap U.S. or Canadian stock. Most of these niche products employ some combination of modest leverage and covered-call options.Harvest Portfolios Group Inc. was the most prolific, adding 27 new single-stock ETFs. Purpose Investments Inc., which pioneered this specialty niche in December 2022, added 17 to its lineup. Another 10 were launched by Ninepoint Partners LP.Employing even greater ...