If you beat the market, you might want to keep the secrets of your investing success to yourself.
Not Warren Buffett.
The chairman of Berkshire Hathaway shared his 31-page letter to investors on Saturday and didn't hold back on what propelled the portfolio last year and what should drive future returns.
Shares ticked up 6.4% in 2015 (as measured by book value) vs. a 1.4% improvement in the S&P 500 that included dividends.
Since 1965, the compound returns of the shares have averaged 19.2%.
"Charlie Munger, Berkshire vice chairman and my partner, and I expect Berkshire's normalized earning power to increase every year," he explained in the letter.
Buffett adds that actual year-over-year earnings could decline at times due to "weakness in the U.S. economy or, possibly, because of insurance mega-catastrophes."
(Related on ThinkAdvisor: Warren Buffett's 10 Nuggets of Wisdom: Berkshire Meeting, 2015)
He also points out that normalized gains might "be small" sometimes and "material at other times."
The Oracle of Omaha says that last year "was a good one."
Read on for some of the most illuminating highlights of his 2015 letter to shareholders.
1. Invest in Customer Service, Market Dominance
Buffett was quick to point out that its stake in BNSF railroad, which underperformed in 2014, "dramatically improved its service to customers last year."
How did this happen?
Berkshire invested nearly $6 billion in capital expenditures, "a sum far and away the record for any American railroad and nearly three times our annual depreciation charge," Buffett says.
"It was money well spent," he stated.
The investment counts, because it helps solidify BNSF's top position among America's seven largest railroads.
It moves roughly 17% of America's intercity freight, he says, and 45% more ton-miles of freight than its closest competitor.
"Consequently, our maintaining first-class service is not only vital to our shippers' welfare but also important to the smooth functioning of the U.S. economy," Buffett stated.
It's worth noting that most American railroads had disappointing results in 2015. Meanwhile, BNSF, saw its pre-tax income rise by nearly $7 billion, a nice jump from some $600 million in 2014.
2. Focus on Core Holdings
According to Buffet, BNSF is the largest of Berkshire Hathaway's "Powerhouse Five."
These investments include Berkshire Hathaway Energy, Marmon, Lubrizol and International Metalworking Cos. (IMC), which are its most profitable non-insurance businesses. They earned over $13 billion last year, a jump of $650 million over 2014.
Plus, by using cash and a bit of shares, Berkshire delivered a nearly $13 billion gain in annual earnings by these five companies over 12 years with minor dilution of its shares.
"That satisfies our goal of not simply increasing earnings, but making sure we also increase per-share results," Buffett stated.
This group, he says, is being transformed into the "Powerhouse Six" in 2016 with the recent addition of Precision Castparts Corp. (PCC), which makes aerospace parts.
PCC CEO Mark Donegan and IMC CEO Jacob Harpaz "transform very ordinary raw materials into extraordinary products that are used by major manufacturers worldwide. Each is the da Vinci of his craft," explained Buffet.
3. Embrace a Culture of Excellence
Berkshire's decision to purchase of Precision Castparts, stemmed in part from the strong performance of International Metalworking Cos..