Alphabet  (GOOGL)  began its fourth-quarter earnings call with analysts after the Monday market close and enthusiastic investors have been sending the stock soaring.

Throughout the day the former Google's share price kept climbing until it ended regular trading at $770.77, up 1.2%. But in the after hours the shares bounced nearly 6% to $815. 

Google investors, including TheStreet's Jim Cramer's charitable trust,  Action Alerts PLUS, were pleased as all get out as they listened in to Google CFO Ruth Porat, who said the company -- now the world's most valuable publicly traded company with a market cap of $565 billion surpassing Apple at $539 billion -- will keep investing in "moonshots," or big bets. 


When you're the CEO of a major company investors love whatever the market, you can fight back when you don't like what Wall Street has to say about your baby.

That's exactly what Tesla (TSLA) CEO Elon Musk did when Morgan Stanley's Adam Jonas lowered his price target on Tesla shares again. This time, Jonas cut a hefty 26%, bringing the stock's price target to $333 from $450 over concerns about delays in launching the Model X and the Model 3, which will cause fewer electric cars to be produced. 

"We are lowering our price target by 26% to reflect our lowered volume expectations for Model X and Model 3, a lower valuation for Tesla Energy, and accelerating competition in the mobility business," Jonas wrote in a note Monday. Jonas cut Tesla's price target after citing a laundry list of things he didn't like: delays and overruns; slower (and lower) expectations in Model 3 volume; reduced valuation of Tesla energy; and more competition. 

No matter. Musk responded by exercising his option to buy and hold $100 million of the stock. The news delighted investors. Shares closed Monday at $196.94, up 3%. 


Promises, promises...

Yahoo! (YHOO) CEO Marissa Mayer is running out of time, but that doesn't seem to faze her after promising better days for the past 13 earnings reports since she was hired.

Disgruntled investors sent the stock's shares down but they closed up a fraction to $29.57. price down throughout the day, eventually 

According to sources quoted by The Wall Street Journal, Mayer will cut up to 15% of the workforce and close several business units when she presents fourth-quarter 2015 earnings on Tuesday.  

Reduced costs could make the Internet pioneer attractive to buyers, such as Verizon Communications. Verizon said in December that it would consider buying Yahoo!'s core business.

Analysts are expecting the company to report earnings of 13 cents per share on revenue of $1.19 billion for the quarter. 


Will investor Marc Andreessen and private equity firm Silver Lake be Twitter's (TWTR) knights in shining armor? 

Andreessen and Silver Lake have "considered some sort of deal" to join forces and buy for the microblogging site, reports The Information. Twitter's shares jumped on the news by 6.6% to close at $17.90.

But even that nice increase and recent decisions to overhaul the company -- including hiring former American Express  (AXP) executive Leslie Berland -- may not be enough.

"Twitter has been going nowhere but down," Erik Gordon, a professor at the University of Michigan's Ross School of Business, told Bloomberg. "It is easy prey for a takeover, and a go-private deal with Silver Lake could be its best bet. Silver Lake is smart, patient money in the IT space." Last week, CEO Jack Dorsey announced the departure of four key executives. 

This article is commentary by an independent contributor. At the time of publication, the author held no positions in the stocks mentioned.

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