Shares of Hindustan Zinc are likely to see higher activity ahead of the SEBI board meet scheduled for June 19. According to reports, the board will consider various reform measures in the primary markets, including allowing non-promoters to sell shares through offer-for-sale. With the Government holding a residual stake in HZL (29.54 per cent), SEBI move in that direction, according to experts, will quicken the share sale. Sesa Sterlite owns 64.92 per cent stake in HZL.