By Rex Crum, MarketWatch

SAN FRANCISCO (MarketWatch) -- Tech stocks followed the broader market south Wednesday, with Cisco Systems Inc. among the decliners after Citigroup started its coverage of the company with a sell recommendation and a list of concerns about the networking-equipment giant.

The day's overall negative sentiment was fueled by reports that the Federal Reserve may soon pull back on its bond-buying program.

Cisco (CSCO) closed with a loss of 1.6%, at $20.88 after a team of Citigroup analysts set a sell rating and an $18-a-share price target on the company's stock, as part of a broad initiation of coverage of several tech companies. Citigroup cited issues such as Cisco losing market share in the data-center switching business as well as long-term competitive threats to its core networking business as reasons for its sell rating.

Citigroup forecast long-term revenue growth for Cisco of just 3% to 5%, which is below the company's outlook for 5% to 7% growth.

Citigroup also put a sell rating on BlackBerry Inc. (RIMM). "Wind-down costs and purchase requirements make winding down BlackBerry expensive," and as its subscribers decline, sales from services should continue to falter as well, the brokerage said.

BlackBerry's shares closed at their break-even point of $5.97.

Citigroup also issued a sell recommendation for Brocade Communications Systems Inc. (BRCD). Brocade's shares fell more than 2% to $8.43.

Among other stocks in the tech sector, Citigroup started coverage of Ciena Corp. (CIEND), Corning Inc. (GLW), Motorola Solutions Inc. (MSI), Garmin Ltd. (GRMN), Ericsson (ERICY), Polycom Inc. (PLCM), Juniper Networks Inc. (JNPR) and Infoblox Inc. (BLOX) with neutral ratings, and set buy ratings on Qualcomm Inc. (QCOM), Riverbed Technology Inc. (RVBD), F5 Networks Inc. (FFIV) and Nokia Corp. (NOK).

The Nasdaq Composite Index (RIXF) ended up putting in its worst performance in weeks, and fell almost 57 points, or 1.4%, to close at 4,003. The Philadelphia Semiconductor Index (SOX) shed 1% and the Morgan Stanley High Tech 35 Index (MSH) fell by 1.3%.

Despite the broad losses, Groupon Inc. (GRPN) managed to rise 1% and close at $10.14 a share. Wells Fargo Securities analyst Trisha Dill raised her rating on Groupon to outperform, or buy, from market perform, and set a valuation range on Groupon's stock of $13 to $14 a share.

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