He pointed to inflows into equity mutual funds during January, saying that TD Ameritrade traders were net buyers of stocks during the month amid signs that individual investors were returning to the market.
Retail investors are being lured back by optimism that the U.S. economy is improving and that Europe will avoid a major blow up.
But Tomczyk cautioned that the U.S. economic recovery remains fragile — as evidenced by the surprise fourth-quarter contraction — and said the ongoing budget fight in Washington could still undermine growth.
"There's no question people will start to invest," he said, adding that "it's going to take time."
But there are also questions about whether the market can reach new all-time highs.
Tom Bradley, TD Ameritrade's president of retail distribution, told the conference that retail investors don't risk getting in right at the top. "Retail investors will lag, but just by a bit," he said.
There are other longer-term reasons to believe investors will continue to put money into equities.
Tom Nally, TD Ameritrade Institutional president, said that "echo boomers" are starting to amass their own wealth and are inheriting their parents' money. "Gen Y is 75 million to 80 million strong," Nally said, "and their wealth will grow from about $2 trillion today to $28 trillion in 2016."