Retail investing in our bustling metropolis has been flipped upside down lately, with everyday folks stepping up their market game. Researchers R. David McLean, Jeffrey Pontiff, and Christopher Reilly have dropped some serious insights in their study, “Taking Sides on Return Predictability,” published in The Journal of Financial Economics. So, who’s making the shrewd moves and who’s just winging it?

The Research Rundown

These guys conducted what might be the most in-depth look at market players ever. They scrutinized the trading tactics of nine market participant types, including:

• Six institutional investors: mutual funds, banks, insurance firms, wealth managers, hedge funds, and other big players.
• Short sellers: mostly hedge funds betting on stock downturns.
• Firms themselves: through their own share buybacks and issuance.
• Retail investors: folks like you and me playing the market.

They dug into how these groups operated across 130 stock return anomalies—those quirks that academia swears can predict stock performance. Observing changes in ownership over one and three years before the anomaly variables were crafted, they got a good sense of each group’s trading story from October 2006 to December 2017.

Who’s Winning and Who’s Floundering?

The Overachievers: Firms and Short Sellers

Firms, believe it or not, are the savviest traders. When they buy back or issue shares, they usually hit the nail on the head. Companies issuing shares often had lower expected returns, while those buying them back anticipated higher returns. Corporate insiders just know stuff the rest of us don’t.

Short sellers came in second. Targeting stocks with low expected returns, their bets generally predicted future stock drops. Yet, when the 130 anomaly variables came into play, their predictive magic faded away. Turns out they don’t have secret intel; they’re just masters of using what’s out there.

The Underperformers: Retail Investors

Here’s the scoop on individual investors: it ain’t pretty. Retail investors tend to make lousy trades:

• Buying low-return stocks and selling high-return ones.
• Over time, their trades predicted returns that went the wrong way.
• The anomaly variables explained 18% of their three-year trading habits.

Interestingly, though, their short-term weekly trades predicted positive returns—short-term blips worked, just not the long-haul stuff.

The Middle Ground: Institutional Investors

Surprisingly, our powerhouse institutions didn’t shine:

• They held more low-return than high-return stocks, contributing to market anomalies.
• The anomaly variables could explain 5% or less of their trading over three years.
• Institutional trading seemed scattershot about future returns.

Hedge funds? While they nailed short selling, their other stock picks didn’t predict positive returns. Go figure.

Lessons for the Everyday Investor

Here are some takeaways to consider:

1. Know Your Limits: If the big guys can’t pick consistent winners, don’t fool yourself.
2. Watch the Insiders: Corporate buybacks might be a positive signal; heavy issuance, not so much.
3. Pay Attention to Short Interest: It’s not just chatter. Rising interest could spell trouble for stocks.
4. Ease Up on Trading: Frequent trading can be a performance killer.
5. Be Wary of Institutions: Just because they’re buying doesn’t mean it’s a great deal.
6. Think Passive: Given the struggles of seasoned pros, passive strategies look pretty appealing.

The Big Picture

This study throws a cold splash of reality at active investors. The real market masters—firms managing their own shares and short sellers—hold the knowledge cards. Both retail investors and institutions are often caught offside in the predictable return game.

For city slickers navigating the investment world, the message is clear: humility paired with passive strategies outperforms overconfidence and frantic trading any day. Without exclusive insights, sticking to a low-cost, diversified approach is your ticket to long-term financial success.