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The Goldman strategy that’s returned 105% in days

Traders who have pursued a strikingly simple strategy this earnings season have cashed in big time.

Goldman Sachs' options research team has long advocated buying calls on stocks set to report earnings. Simply put, the average stock rises on earnings, taking the price of the relevant calls (which are options that grant their owner the right to buy a stock for a given price within a certain time frame) higher along with it.

The strategy of buying calls across the board has "produced an average profit of 14 percent" and was profitable in each of the 19 years studied, Goldman's team reported in an earlier note, although they took pains to add that the strategy doesn't necessarily adequately compensate investors for the risk they are taking on by buying oodles of options.

Read MoreJust buy 'em? The average stock rises on earnings, Goldmanfinds

In the early days of this earnings period, however, those pursing a pure call-buying strategy have enjoyed an incredible bonanza.

Investors who bought call options on the first 13 percent of the S&P 500 companies to report earnings have seen a return of 105 percent on the premiums they laid out, Goldman's Katherine Fogertey, John Marshall and Vishal Vivek said in the report. They looked specifically at calls with striking prices that were close to the price of the stock and set to expire in the near future.

Particularly profitable trades have included buying options on BlackRock, Regions Financial and Bank of America.

For instance, when BlackRock was trading at about $335 two days before its prebell earnings report, the April 340-strike call could have been snatched up for $3. BlackRock then rose on its earnings report, and three days after that hypothetical purchase, the option expired at a value of $18 — for a 500 percent return in under a week.

Of course, not every trade will work out that well. And Goldman's strategy has undoubtedly benefited from the general rise in stocks over the course of earnings season, as well as the particular bounce in financials, the first major group to report.

But the options research team say a general call-buying strategy will continue to be a winning one, given the general nature of market sentiment.

"The options market has lowered the expectation for earnings moves over the past 2 weeks despite strong returns on option buying this earnings season," the strategists wrote in their report Wednesday. "We believe this presents an even more compelling opportunity to buy calls ahead of results."

Erin Gibbs of S&P Investment Advisory says there's a fundamental reason this strategy has been so effective now.

"For this quarter, we're looking for most of the earnings coming in the second half of the year, so it's also about guidance," which takes on particular salience as tough questions are being asked about the state of the U.S. and global economy.

"It's just sort of one of these extreme fundamental quarters where we expect more volatility," Gibbs said Thursday on CNBC's "Trading Nation."

Still, some traders remain skeptical.

While he believes that Goldman has indeed found a market inefficiency, Boris Schlossberg of BK Asset Management said that "the Murphy's rule of trading is that once somebody points out the trend, it's pretty much over."

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Trading Nation is a multimedia financial news program that shows investors and traders how to use the news of the day to their advantage. This is where experts from across the financial world – including macro strategists, technical analysts, stock-pickers, and traders who specialize in options, currencies, and fixed income – come together to find the best ways to capitalize on recent developments in the market. Trading Nation: Where headlines become opportunities.

Brian Sullivan

Brian Sullivan is co-anchor of CNBC's "Power Lunch" (M-F,1PM-3PM ET), one of the network's longest running programs, as well as the host of the daily investing program "Trading Nation." He is also a frequent guest on MSNBC's "Morning Joe" and other NBC properties.

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