* STOXX 600 up 0.1 pct, set for small weekly loss
* Trade worries, geopolitics still in focus
* NEX jumps after CME approach
* Siemens Healthineers rises after delayed open (Recasts, adds quote and detail, updates prices)
LONDON, March 16 (Reuters) - European shares rose on Friday, led by NEX Group as it jumped after a takeover offer, though stocks were on track to end the week with a loss as worries about a trade war and geopolitical tensions kept investors on edge.
The pan-European STOXX 600 index was up 0.1 percent by 0954 GMT.
Germany's DAX index rose 0.3 percent following a delayed open. The first day of trading got off to a bumpy start for Siemens Healthineers, which gained just over 5 percent.
Worries about a possible trade war have hung over equities since U.S. President Donald Trump announced this month that he would introduce tariffs on steel and aluminium imports, while a shakeup of the president's cabinet has also dampened the mood.
The STOXX 600 was on track to post a loss of around 0.3 percent for the week.
"We have become a little bit more tepid on European stocks as the year progresses," Gautam Batra, head of investments at Mediolanum Asset Management, said.
"We felt valuations carried weight in favour of Europe but the sector make-up doesnt look that great and the news on the trade front isnt supportive for Europe either," Batra added.
Deal-making added some spice to trading, with exchange operator NEX Group soaring around 33 percent to the top of the STOXX following a preliminary takeover offer from U.S.-based peer CME Group.
"There has been an element of companies holding back over the last couple of years until the economic recovery got established," Richard Hunter, head of markets at Interactive Investor, said.
"In this hyper-low interest rate environment, there are only so many things that companies can do with ... the excess cash they are generating and a lot of them have done share buybacks or increased their dividend and more lately we're now seeing a spike in M&A activity," Hunter added.
Telecoms group Altice jumped 5 percent following its results, with the debt-ridden group saying it sees signs of a recovery in the competitive French market.
French oil storage and distribution company Rubis was another top gainer, up 3.3 percent at a record high after reporting full-year results and upping its dividend.
However, shares in UK housebuilder Berkeley Group fell 4.6 percent after the company said it could not boost building volumes beyond current plans.
(Reporting by Kit Rees and Helen Reid; Editing by Dale Hudson)