By Jonathan Stempel and Tanya Agrawal
(Reuters) - Berkshire Hathaway Inc
The changes were disclosed in a U.S. Securities and Exchange Commission filing made public on Thursday, which detailed $89 billion of Berkshire equity investments, mostly listed on U.S. exchanges, as of June 30.
U.S. regulators require large investors to disclose their stock holdings every quarter, and the disclosures can offer a window into their strategies for buying and selling stocks.
Berkshire took a 17.8 million-share stake in Calgary-based Suncor, which is Canada's biggest oil and gas producer and has a large presence in the Alberta oil sands. That stake was valued at $524 million at the end of the second quarter.
It also reported a small, 547,312-share stake in Dish, the satellite TV company run by billionaire Charlie Ergen, valued at $23.3 million on June 30.
Suncor spokeswoman Kelli Stevens declined to comment, saying the company does not typically discuss individual investors' holdings. Dish spokesman Bob Toevs also declined to comment.
Shares of companies often rise after Berkshire discloses sizable new investments because investors try to copy Buffett, the world's fourth-richest person according to Forbes magazine.
In afternoon trading, Suncor shares were up 68 cents, or 2 percent, at C$34.47. Dish shares were down 29 cents at $44.47.
David McColl, a Morningstar Inc equity analyst in Chicago, said a shortage of pipelines has forced Suncor and rivals to move more products by rail, but that Suncor has indicated an ability to address this problem in the next one to five years.
"Suncor is one of the most heavily undervalued Canadian integrated oil producers," he said. "It is no surprise that a value investor like Berkshire Hathaway would view it as a phenomenal investment opportunity."
Berkshire has benefited this year from Buffett's preference for investments in businesses and stocks over fixed income, which has been under pressure from rising interest rates.
The Omaha, Nebraska-based company's book value per share, Buffett's preferred measure of growth, grew 7.6 percent from January to June.
Its largest stock holding, Wells Fargo & Co
Berkshire spent $4.64 billion on stocks in the quarter. While Buffett has said he makes Berkshire's largest investments, some investments are made by portfolio managers Todd Combs and Ted Weschler, who oversee several billion dollars each.
Thursday's filing did not say who bought what, but said that some holdings were reported confidentially to the SEC.
Buffett sometimes gets SEC permission to amass big positions quietly so he need not worry about copycat investors. One of Berkshire's top holdings, a $13 billion stake in International Business Machines Corp
Earlier this month, Berkshire said it ended June with $101.9 billion of equity securities overall. Its top four holdings - Wells Fargo, Coca-Cola Co
Berkshire also owns more than 80 businesses in such areas as insurance, railroads, utilities, chemicals, apparel and food.
In recent months, it bought half of ketchup maker H.J. Heinz Co and made several smaller acquisitions.
On Wednesday, its HomeServices of America Inc unit, the second-largest U.S. full-service residential real estate brokerage, said it bought real estate service companies Prudential Fox & Roach and Trident Group for undisclosed prices.
KRAFT, MONDELEZ SLASHED
During the quarter, Berkshire added to stakes in Bank of New York Mellon Corp
Berkshire slashed its stakes in food companies Kraft Foods Group Inc
It also reported lower stakes in drugmaker GlaxoSmithKline Plc
The SEC filing was to have been made public on Wednesday, but the release was delayed by a glitch in the regulator's filing system. An assistant to Buffett said Berkshire submitted the filing prior to Wednesday's deadline.
In afternoon trading, Berkshire's Class A shares were down 1.2 percent at $172,711, and its Class B shares were down 1.3 percent at $115.08.
(Reporting by Tanya Agrawal in Bangalore and Jonathan Stempel in new York; Editing by Ted Kerr and John Wallace)