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Stocks were indicated higher on Monday morning after a three-day Easter weekend, but many European markets were closed for the day. Now that stocks have risen but broken a five-week streak of gains, many investors are wondering if they need to start buying the dips or selling the rallies.

24/7 Wall St. reviews dozens of analyst research reports each morning of the week. The goal is to find new investing and trading ideas for our readers. Some of the daily analyst reports cover stocks to buy, and others cover stocks to sell or avoid.

These are top analyst upgrades, downgrades and initiations seen on Monday morning:

Berkshire Hathaway Inc. (NYSE: BRK-A) was started as Buy and was assigned a $244,500 price target (versus a $210,530 prior close) at UBS. Berkshire Hathaway has very few official analyst calls on it, and the 52-week trading range is $186,900 to $223,011.

CarMax Inc. (NYSE: KMX) was downgraded to Neutral from Buy at Sterne Agee CRT. The stock closed most recently at $48.83 and has a consensus analyst target price of $62.59 and a 52-week range of $41.25 to $75.40.

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