Shares of Alphabet (GOOGL) - Get Alphabet Inc. Class A Report  fell 0.8% to $960.18 on Thursday following a downgrade of the stock at Canaccord Genuity to "Hold" from "Buy" with a $1,000 price target.

"We think much of the growth over the past two years is due to ad load increases on mobile search and YouTube, which (especially the former) will be hard to repeat," Canaccord analyst Michael Graham contended.

He explained that when implementing his detailed segment analysis, it strongly suggests that consensus gross margins projections are too lofty, and although revenue growth should offset that, Graham thinks it will limit the potential for upward EPS revisions.

Further, "GOOGL's P/E multiple of ~24x is expensive by historical standards, and puts the stock within a pitching wedge of our $1,000 price target," he added.

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Beware Tesla fanboys: Tesla (TSLA) - Get Tesla Inc Report burning money, but shareholders are the likely ones to blister and feel the pain. The standard 90-day corporate equity lockup period for Tesla, following its $402.5 million stock sale of March 16, ends Thursday TheStreetreports. As a result, Tesla will be free to conduct another stock offering as soon as Thursday, which is a real possibility given the electric car company's debt situation, partly due to its Solar City investment, and need for additional cash. Any new issuance the company may seek would likely need to take place before July, which is when Tesla issues its quarterly report on car sales. Alternatively, an offering could come in late August after Tesla issues its quarterly financial report.

Shares could start to come under pressure.

Mining stocks get whipped: Global mining stocks found themselves in a hole Thursday TheStreetreports, after South Africa's government said that at least 30% of domestic mining assets should be black-owned even if previous black owners sell their stakes. South African-exposed mining companies fell sharply in the wake of the announcement. London-listed Anglo American plc (AAUKF) tumbled 4.4% to 1,013 pence ($23.87) a share, South32 Ltd fell 4% to 158 pence, BHP Billiton plc (BHP) - Get BHP Group Ltd Sponsored ADR Report was down 2% to 1,155 pence, Rio Tinto (RIO) - Get Rio Tinto plc Sponsored ADR Report fell 2% to 3,079 pence and Glencore plc (GLNCY) fell 2.6% to 279.2 pence. South African gold producers were hit even harder. Sibanye Gold Ltd. (SBGLF) plummeted 6.7% to 1,562 South African rand ($121.38) and AngloGold Ashanti Ltd. (AU) - Get AngloGold Ashanti Limited Sponsored ADR Report fell 4.8% to 14,015 rand.

Amazon eyes a new prize: Amazon (AMZN) - Get Amazon.com, Inc. Report may be preparing a deal to buy Slack Technologies in a deal that could value the messaging startup group at more than $9 billion, TheStreetpoints out. With Microsoft's (MSFT) - Get Microsoft Corporation (MSFT) Report deal for LinkedIn being well-received, this deal seems logical for an Amazon that is aggressively expanding into the cloud.

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