By Manuela Mesco

MILAN--Fastweb SpA, an Italian telecommunications company controlled by Switzerland's Swisscom AG (SCMN.VX), will invest 400 million euros ($515 million) in Italy's fiber-optic network, the company said Thursday.

Fastweb said the investment will allow the company to reach 20% of Italian companies and families--5.5 million families and companies--by the end of 2014.

The Internet provider said the sum will add up to a previously announced investment of EUR1.6 billion that the company will spend in the next four years strengthening the network.

The additional sum announced Thursday will be used to build a combination of fiber-to-the-home and fiber-to-the cabinet technology, the company said.

Write to Manuela Mesco at manuela.mesco@dowjones.com

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