Berkshire Hathaway's book value has lost some relevance; the insurance business and subsidiaries like BNSF are big factors in this consideration. See why BRK.A stock is a Hold.

In a nutshell, buying Berkshire Hathaway is nearly akin to buying a broad market index fund, except there's no expense ratio and the underlying holdings are curated by a legendary investor and his handpicked team. If you're considering putting money into an index fund, consider instead simply buying some Berkshire stock.

Berkshire Hathaway shares jumped to a record high Monday after the conglomerate reported over the weekend that its fourth-quarter operating earnings surged more than 70% from a year earlier. Monitor these important chart levels.