The index tracks 27 listed companies which have large exposure in the South Island. The top four, all with market capitalisation greater than $1billion, collectively increased market capitalisation by $1.3billion (up 6%).
Of those, Meridian Energy recorded the largest percentage increase, lifting by $1.4 billion (13.5%) followed by Ebos Group which recorded a $387.6 million (11.5%) gain.
Ryman Healthcare and Synlait Milk both recorded decreases, falling $250 million (4.1%) and $250.9 million (13.2%) respectively in the quarter to June 30, 2019.
On the other end of the index, the smallest 10 companies collectively grew during the quarter, recording a $350 million (20.8%) gain in market capitalisation.
In a statement, Scott McClay, a corporate finance partner in Deloitte's Christchurch office, said it was pleasing to see how the momentum was continuing for the index.
It was particularly pleasing to see how it was spread across the companies, including the smaller 10 companies, during a period in which general economic conditions had not been favourable.
Conversely, three out of the seven sectors tracked recorded gains, the energy and mining sector recording the largest percentage increase of 13.5% in market capitalisation. At the other end of the scale, the primary sector recorded a 10.1% decrease in the quarter.
Outside the top four, the index's best performers - in percentage terms - were Dunedin-based Blis Technologies (up 89.4%), Pharmazen (up 82.2%) and Chatham Rock Phosphate (up 32.1%) during the June quarter.
The most significant declines outside the four, during the quarter - in percentage terms - were Dunedin-based Pacific Edge (down 30%), New Zealand King Salmon Investments (down 29.3%) and Marlborough Wine Estates Group (down 16.8%).
