Stocks that moved substantially or traded heavily Friday:
Overstock.com Inc., up $3.05 to $41.65
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The online discount retailer said a private equity firm is investing in its blockchain business.
Citigroup Inc., down $1.72 to $70.26
Bank stocks fell as interest rates turned lower.
Banco Santander SA, down 18 cents to $5.19
European banks suffered steep losses as investors worried that financial turmoil in Turkey will spread to them.
Caterpillar Inc., down $2.60 to $135.92
Industrial companies took sharp losses Friday as the U.S. dollar strengthened.
Dropbox Inc., down $3.38 to $31.05
The online file sharing company said its chief operating officer will step down in September.
Microchip Technology Inc., down $10.67 to $87.41
The chipmaker forecast weaker quarterly revenue than analysts expected.
Express Scripts Holding Co., up $1.82 to $83.64
A shareholder advisory firm said it supports Cigna's plan to buy Express Scripts.
Stamps.com Inc., up $7.40 to $255.50
Smaller and more U.S.-focused companies did better than the rest of the market as multinationals struggled.