Markets End Week on a Sour Note

Costco was a big loser Friday.
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This is how markets performed Friday October 6.

A weak jobs report that was released before the opening bell set the tone for the day as all three of the major indices closed trading in the red for the first time all week. The S&P broke an eight-day winning streak, falling

Las Vegas-based data center company Switch (SWCH) - Get Report jumped nearly 25% following its debut on the stock market Friday. The company priced its IPO higher than expected at $17 a piece. The company said it would sell over 31 million and plans to use the proceeds to buy out investors.

Big box retailer Costco (COST) - Get Report was one of the markets' biggest losers Friday, falling more than 6% after the company reported that its margins were squeezed in its most recent quarter. Margins dropped by 15 basis points. Sales were still strong, though - for the full year, sales increased 9%, while same-store sales rose nearly 4%.

Pinnacle Entertainment (PNK) - Get Report rose and Penn National Gaming (PENN) - Get Report fell on reports of merger talks. The two gaming companies have reportedly had "on-again, off-again" talks to complete a merger, but have failed to do so, according to The Wall Street Journal.