Mark Lister, head of wealth at Craigs Investment Partners, said the key reason for Spark's recent performance was down to expectations of interest rates remaining lower for longer, as well as a general desire from investors to focus on more defensive, predictable industries amidst the increasingly uncertain economic backdrop.
"All of the risks we are seeing (both domestically and offshore) have contributed to the Reserve Bank taking a much more cautious approach to monetary policy, and this has seen investors look for companies with above average dividend yields, that will also prove resilient should we enter a more challenging economic period."
The NZX 50 index is up 1.7 per cent this week and many of the top performers are companies with high dividend yields, he said.
Genesis Energy has been the top performer up 8.1 per cent.
Lister said Spark may have benefitted from earlier weak performance with its shares down around 5 per cent for the year so far compared to the NZX 50 which is up more than 10 per cent.
"I think Spark has attracted a bit of interest just recently on the back of expectations of lower interest rates, and also because it has lagged some of the other companies that pay attractive dividends," he added.