The past week's data-point-of-consequence for investors had to be investment decisions by Warren Buffett's Berkshire Hathaway (BRK.A).

Buffett ended positions in several stocks in the fourth quarter, including the Bank of America (BAC), Nike (NKE), Fiserv (FISV), Becton Dickinson (BDX), Comcast Corp. (CMCSA), Lowe's Co.s (LOW), Nalco (NLC) and Nestle (NSRGY), according to a filing, The Wall Street Journal reported.

Berkshire added to a holding of only one stock in the fourth quarter: Wells Fargo (WFC).

There is no shortage of analysis on the investment techniques of Warren Buffett. It seems that the books about him could fill a library!

However, when looking at his principles, it is not always easy to figure out how he prioritizes things. Of course, few companies have all the criteria.

Well, according to an interview with the Financial Crisis Inquiry Commission recently, Buffett gave some interesting insight on this.

For Warren Buffett, it wasn't a big deal. Monday, his company, Berkshire Hathaway (BRK.A), agreed to purchase the 19.9% of Wesco Financial Corp. (WSC) it did not already own for $548 million. The stock price was only up 1.33% in early trading. Then again, there was no surprise that this transaction would happen -- and that it would be at roughly the net value of Wesco.

Yet the deal certainly has significance. After all, Wesco has been a part of the Buffett empire for decades, and the chief of the company is Charlie Munger, who is the vice chairman of Berkshire. However, he is 87 years old and yes, he is actually thinking about the process of succession. To do this, there will need to be some reshuffling of assets.

Coca-Cola (KO) has more than $13 billion in cash.

The top five companies (according to market cap) are:

• Exxon Mobil (XOM): $398.3 billion
• Apple (AAPL): $309.0 billion
• Microsoft (MSFT): $237.5 billion
• General Electric (GE): $215.0 billion
• Berkshire Hathaway (BRK.A): $202.5 billion

The market is getting gently hammered today, but that only presents more opportunities from my perspective.

I am in Ixtapa, Mexico, nearing the conclusion of my first ever week long rest during a 35 year working career ... and counting. In some ways I am hoping to mold my future working environment from seashore to shining seashore -- all around the world -- taking advantage of modern technology. I am thinking of it as "have beach (+Internet), will travel."

Berkshire Hathaway (BRK.B) overall option implied volatility of 21 is below its 26-week average of 24, according to Track Data, suggesting decreasing price movement for Warren Buffett's conglomerate.

Wendy's/Arby's (WEN) overall option implied volatility is at 40, below its 26-week average of 47, according to Track Data, suggesting less risk into its investor's day on January 27.

Options Update is by Stock Specialist Paul Foster of theflyonthewall.com.

This is the fifth year that I am posting my stock picks for the year. There is a lot of foolishness in doing so because each year that I have made such suggestions, including 2009 when I owned all of the picks, it is assumed that I would hold all of the positions without responding to market conditions, or changes in the specific company. No adding to, or cutting a position. This is not the real world.

It is not possible for everything to remain static. For example, you might find that you hold a stock that made a great run through three quarters, beyond your wildest expectations, and decide it has passed a point where the metrics cannot support anything close to the price. Under normal circumstances you might sell it, except you cannot. By the end of the year the profit you might have realized fades away and you end up reporting on something that is not a true measure of your objective strategy. Nevertheless, once again I will stick with this approach because this seems to be how its done in every publication's annual picks. This year there are eleven.

The year 2010 has come and gone and my results are in. This is my fourth annual stock results to be reported on BlogginStocks, so something of a track record is starting to form. This past year ended with a modest improvement over the unmanaged Standard & Poors 500 index

The original story, Chasing Value: 10 Stock Picks for 2010, took readers through a review of many candidates, concluding with the ten picks, using prices from Dec. 28, 2009.

Could a stock that you made 1,100% on still have room to run? Yes, it is possible. In particular if it had a near death experience as a penny stock for a while.

That is the case with Newcastle Investments (NCT), the CMBS lender and real estate investment company that reached a recent high of $7.10 and has settled back down, most recently hovering between $6.70 to $7.00. It closed Thursday December 23 at $6.71.

The list of stocks under consideration has been reduced from eleven to ten, to seven and now in today's story four. Starting with five major defense contractors and six major oil companies (see Chasing Value: You Must Own Defense and Oil for Safety), I began a search to find one stock in each sector that might be suitable for inclusion in my list of 2011 stock picks posted last week Chasing Value: 2011 Stock Picks -- The Journey Begin.

Today we continue our analysis by examining return on equity (ROE), return on invested capital (ROIC), and price-to-earnings-to-growth (PEG). Each stock is ranked by sector and metric from best to worst. Sometimes there are clear winners and others there is little to separate one stock from the next. However, in total, a picture can be drawn that does portray a superior opportunity.

It's that time of year when I start thinking about my 2011 stock picks, and enough folks have been nudging me that I might as well get on with it. The list will not be finalized until the end of the month. During the interim time I will take readers through a number of possibilities, explaining the rational for my suggestions along the way and adding and subtracting until I get the list down to ten.

Today I will start by reviewing opportunities discussed in another post and determine which of these stocks might provide the best value. The list was originally cast as a globally diversified, large cap, dividend paying and relatively stable group of companies that would likely weather any storm. See: Chasing Value: Bonds, Gold, Stocks and Capital Flight

"Berkshire Hathaway class B (BRK.B) recently made waves when the conglomerate announced that it had hired hedge fund manager Todd Combs to take over a 'significant portion' of its huge investment portfolio," notes Geoffrey Seiler.

The editor of BullMarket.com explains, "Nevertheless, the stock remains a a buy on our Recommended List. Here's a look at the situation.

"Berkshire CEO Warren Buffett, of course, is considered one of the top investment managers of all time. However, the Oracle of Omaha is now 80 years old, and he won't be around forever.

When you write about Apple (AAPL), you inevitably hear from some naive person informing you that, "You just don't get it; Apple is different."

There are certainly many things about Apple that are very different, but in the context of the "you just don't get it" crowd, it is absolutely not. The same was said about Google (GOOG) only a short while ago, Xerox (XRX) three decades ago and Winchester -- now part of Olin Corp. (OLN) -- rifles 125 years ago.