LONDON (Reuters) -Elliott has pushed its stake above 5% in Brewin Dolphin, a British wealth manager which is under offer from Royal Bank of Canada, the activist investor said on Friday. Elliott’s stake reached 5.2% as of May 12, it said in a regulatory filing. Elliott declared a 2.42% stake earlier this week. Brewin Dolphin’s shares have jumped 61% to 512 pence a share since RBC made its 515-pence offer in March, valuing the firm at 1.6 billion pounds ($1.95 billion). Brewin this week reported a 2.3% rise in first-half adjusted profit before tax and said the RBC takeover was expected to comple…