Kass: Is This the End of Warren Buffett?

This blog post originally appeared on RealMoney Silver on Jan. 27 at 7:49 a.m. EST.

"All good things must come to an end, but all bad things can continue forever."

-- Unknown

Last week, I suggested that Warren Buffett's star was crashing back to earth.

Barron's Senior Editor Andrew Bary penned a similar piece over the weekend.

Analysis	Discussion	Stock Rating
Jim Cramer: Human After All	Review Buffett's Portfolio (Add comment)	HOLD (Get Report)

Armed with some additional information, I have made tentative conclusions regarding the intrinsic value of Berkshire Hathaway's (BRK.A Quote) common shares.

At year-end 2007, Berkshire's investment portfolio had a cost of $39.2 billion and a market value of $75 billion. Since the end of third quarter 2008, the value of Berkshire's investment portfolio has experienced a pronounced drop.

Berkshire's six investments listed below have fallen by over $16 billion in value; this is more than just a bump in the road:

1. Wells Fargo (WFC Quote) closed at $37.53 on Sept. 30, 2008. Last week, it closed at $15.87. Berkshire owns 290 million shares, a drop of $6.3 billion dollars.

2. American Express (AXP Quote) closed at $35.43 on Sept. 30, 2008. Last week, it closed at $16.00. Berkshire owns 151 million shares, a drop of $2.9 billion dollars.

3. Coca-Cola (KO Quote) closed at $52.88 on Sept. 30, 2008. Last week, it closed at $42.20. Berkshire owns 200 million shares, a drop of $2.1 billion dollars.

4. Burlington Northern Santa Fe (BNI Quote) closed at $92.43 on Sept. 30, 2008. Last week, it closed at $63.32. Berkshire owns 63 million shares, a drop of $1.8 billion dollars.

5. ConocoPhillips (COP Quote) closed at $73.25 on Sept. 30, 2008. Last week, it closed at $48.10. Berkshire owns 60 million shares, a drop of $1.5 billion dollars.