March 21 Premarket Briefing: 10 Things You Should Know

Updated from 7 a.m. EDT

Here are 10 things you should know for Friday, March 21:    

1.-- U.S. stock futures were rising Friday, with the benchmark indices looking at weekly increases of nearly 2%, as encouraging signs on the U.S. economy helped offset surprisingly hawkish statements from Federal Reserve Chairwoman Janet Yellen on Wednesday.

2.-- The economic calendar in the U.S. on Friday is bare.

3.-- U.S. stocks on Thursday rebounded following a spate of housing and manufacturing data that underscored the ongoing economic recovery. 

The  Dow Jones Industrial Average closed up 0.67% to 16,331.05, while the  S&P 500 added 0.6% to finish at 1,872.01. The  Nasdaq gained 0.27% to close at 4,319.29.

4.-- The Federal Reserve's annual "stress tests" of the 30 biggest U.S. banks found that all but one of them passed muster with sufficient capital buffers to keep them lending through an economic crisis.

Zions Bancorp (ZION) fell short. The bank posted a fourth-quarter loss as it booked hefty charges related to losses on investment securities and other one-time items. 

The stock fell 1.3% in premarket trading to $32.56.

5. -- Turkey blocked access to Twitter  (TWTR) on Friday after Prime Minister Recep Tayyip Erdogan threatened to "rip out the roots" of the social network where links have proliferated to recordings that appear to incriminate him and other top officials in corruption.

The new comes on the same day that Twitter celebrates its eighth anniversary.

Twitter shares fell 0.1%.

6. -- Luxury jewelry retailer Tiffany (TIF) reported a fourth-quarter loss, dragged down by a hefty charge tied to an unfavorable arbitration ruling. 

Adjusted earnings missed Wall Street expectations and its forecast for the year also was short of expectations. 

Tiffany shares fell 2.7% to $88.75.

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