FACTBOX: Top wireless telecom gear makers

HELSINKI (Reuters) - Nortel Networks has agreed to sell its key mobile network equipment assets to Nokia Siemens Networks for $650 million, the companies said on Friday.

Following are comparative first-quarter numbers from the world's three biggest mobile telecom equipment vendors, followed by a summary of the top global players in the sector:

Revenue (in millions of euros)

Q1 '09 Q4 '08 Q1 '08 Q1 YOY pct chng

Ericsson 4,691 6,343 4,180 +12

Alcatel-Lucent 3,598 4,954 3,864 -7

Nokia Siemens 2,990 4,338 3,401 -12

Underlying operating profit margins (in percentage points)

Q1 '09 Q4 '08 Q1 '08

Ericsson 9.5 14.6 7.6

Alcatel-Lucent -7.1 6.0 0.9

Nokia Siemens Networks -4.1 5.2 2.4

Key players in the industry:

ERICSSON

The Swedish company had a 33-percent market share in January-March quarter, down from recent years but still well ahead of rivals who have focussed on integrating their businesses.

Through the 2005 acquisition of fixed-line communications maker Marconi, Ericsson further blurred the lines between the fixed and mobile sectors. Telecom carriers are cutting costs by offering the same services to fixed-line and mobile users.