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If a company's assets are worth more than its market cap, can one say the shares must be undervalued?
Look at Price/book value and there are more than a few stocks that may have a P/B under 1 so this does happen. There are at least a couple of other factors you aren't considering here: Current liabilities - How much money is the company losing each quarter that may cause it to sell repeatedly. If the company is burning through $100 million/quarter that asset is only going to keep the lights on for another 2.5 years so consider what assumptions you make about the company's cash flow here. The asset itself - Is the price really fixed or could it be flexible? Could the asset seen as being worth $1 billion today be worth much less in another year or two? As an example, suppose the asset was a building and then real estate values drop by 40% in that area. Now, what was worth $1 billion may now be worth only $600 million. As something of a final note, you don't state where the $100 million went that the company received as if that was burned for operations, now the company's position on the asset is $900 million as it only holds a 90% stake though I'd argue my 2 previous points are really worth noting. The Following 6 Stocks Are Trading At or Below 0.5 x Book Value–Sep 2013 has a half dozen examples of how this is possible. If the $100 million was used to pay off debt, then the company doesn't have that cash and thus its assets are reduced by the cash that is gone. Depending on what the plant is producing the value may or may not stay where it is. If you want an example to consider, how would you price automobile plants these days? If the company experiences a reduction in demand, the plant may have to be sold off at a reduced price for a cynic's view here.