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This blog post originally appeared on RealMoney Silver .

"A billion here, a billion there, and pretty soon you're talking about real money."

-- Senator Everett Dirksen
Something tells me we aren't in Omaha anymore!

It's melting, it's melting!

Specifically, Berkshire Hathaway's ( BRK.A) investment portfolio and derivative position continue to melt.

According to my calculation -- Berkshire's year-end book value was $109.5 billion -- Berkshire Hathaway has experienced nearly another $3 billion pretax loss today, which includes a pretax loss of $1.75 billion in Buffett's investment portfolio and another $1.15 billion pretax loss in his short put position.

Doug Kass writes daily for RealMoney Silver , a premium bundle service from For a free trial to RealMoney Silver and exclusive access to Mr. Kass's daily trading diary, please click here.
Buffett and His Holdings

Know What You Own: Berkshire Hathaway holds large stakes in stocks such as Wesco Financial (WSC), Burlington Northern Santa Fe (BNI), Moody's (MCO), Washington Post (WPO), USG Corporation (USG) and American Express (AXP). For more on the value of knowing what you own, visit's Investing A-to-Z section.

How you can survive -- and even prosper -- in a rocky midyear market? Get the "best ideas to make real money" from Jim Cramer, Doug Kass, Helene Meisler and other RealMoney experts at our May 2 Investment Conference. Learn more here.
At the time of publication, Kass and/or his funds had no positions in the stocks mentioned, although holdings can change at any time.

Doug Kass is founder and president of Seabreeze Partners Management, Inc., and the general partner and investment manager of Seabreeze Partners Short LP and Seabreeze Partners Long/Short LP.