You have a significant retirement portfolio. You're an experienced investor. You've done pretty well at picking stocks. You probably even own a few of Zacks Top Retirement stock picks like:

Lockheed Martin (LMT Quick QuoteLMT - Free Report) , Ready Capital (RC Quick QuoteRC - Free Report) and OceanFirst Financial (OCFC Quick QuoteOCFC - Free Report) .

If that sounds like you, should you actively trade your own retirement assets?

Maybe...if you're an exceptional investor who can expertly manage risk and keep up perfectly resolute emotional control in the face of market volatility. Be that as it may, for most investors, there might be better ways to accomplish long-term retirement investing objectives.

That's because the risk - reward scenario and investing approach is completely different for long-term wealth building and active stock trading.

Diversification vs. Stock Picking

While stock picking can potentially result in outsized returns, its outsized concentrated risk can pose significant hazards for retirement investors.

A study done by Hendrik Bessembinder of equity markets over nine decades found that just 4% of the best-performing U.S.stocks generated all the market's gains. The rest were flat - the gains of the next 38% were wiped out by the bottom 58%, which lost money.

Those numbers reinforce that, even if you are an experienced and talented stock picker, your chances of success over a long period are very slim.

Is Successful Investing a Mind Game?

Investors think they can make rational decisions, but research shows that the opposite is often true. A recent DALBAR study tracked investors from 1986 to 2015 and found that the average investor substantially underperformed compared to the S&P 500. Over 30 years, the S&P 500 returned 10.35%, but the average investor return was just 3.66%.

It is worth noting that this period included the 1987 crash and enormous bear markets in 2000 and 2008, and the positively trending market of the 1990s as well.

This study indicates that one key explanation behind investor underperformance is attempting to time volatile markets - and that irrational emotional biases are likely to compound investor botches.

Interestingly, even savvy traders tend to underperform because they can't help but allow emotions to drive investment decisions. They may be overconfident and misjudge risk, latch onto a price target, or perceive a pattern that isn't there. This "behavior gap", over the long-term, can be catastrophic with potential underperformance of hundreds of thousands of dollars sabotaging your retirement.

The Bottom Line for Retirement Investors

When it comes to managing your assets for retirement, you must look at performance over the course of years and decades - not weeks or months. Because most traders generally tend to focus on the short term, they may not have the right mindset to achieve successful long-term outcomes.

We're not saying you should not trade at all - far from it. If you enjoy trading, perhaps you should put 10% of your investable assets to work in short-term investments to seek alpha and outsized returns.

But the point we're making here is that the money you have set aside for your retirement should be invested using a more conservative, long-term approach designed to produce reliable returns, so you can steadily build assets and achieve your retirement goals.

Do You Know the Top 9 Retirement Investing Mistakes?

Whether you're planning to retire early or not, don't let investing mistakes derail your plans.

If you have $500,000 or more to invest and want to learn more, click the link to download our free report, 9 Retirement Mistakes that will Ruin Your Retirement.