The retail trading frenzy that sparked a FOMO trade this year may be about to slow, and that's bad news for the stock market

• This year's stock market rally could soon reverse as the retail FOMO trade fizzles out, according to Vanda Research.
• The firm said that while retail inflows into stocks remain strong, seasonal patterns suggest they will soon fade.
• "Seasonality ahead of tax season suggests that flows into US markets will begin to decelerate," Vanda said.  

The retail FOMO trade that helped spark a near-10% rally in the S&P 500 last month is about to fizzle, and that could help accelerate a sell-off in the stock market, according to Vanda Research.