July 20 (Reuters) - Portugal's second-largest telecom operator Nos SGPS SA:
* Reported on Thursday a steep 52.5 percent rise in second-quarter net profit to 40.4 million euros ($47 million), beating the average analysts' forecast of 35 million euros.
* Says rise in profit helped by strong operating results and stakes in companies owned by NOS.
* EBITDA rose 5.4 percent from a year earlier to 156.7 million euros, slightly above the average forecast of 154 million euros.
* Revenues rose 4 percent to 388 million euros.
* Revenue generating units at 9.25 million at the end of June, up 5.8 percent from a year ago
* Client number growth reported in all services. Source text for Eikon: goo.gl/stVx8B Further company coverage: (Reporting by Andrei Khalip)