You are right that Unichem Laboratories rallied sharply in the second half of March by nearly 52%. This was largely driven by promoters adding to their holdings in the company at lower price levels. This was a seen as a signal of promoter confidence in the company which gave a boost to prices. However, SEBI has now clarified that despite the longer time frame given to promoters to announce their quarterly results for March, the insider trading regulations on promoters will continue to apply. Currently, promoters and insiders are banned from trading in shares of the company between the end of the quarter up to 48 hours after the announcement of the results. Due to CONVID-19 and the shutdown across India, the regulator had given time till June 30, as against the deadline of May 31 to declare quarterly results. The promoters had sought special exemption from the government to relax the insider trading regulations for this quarter, which has been struck down by SEBI. That means; the promoters of companies like Unichem where promoters were buying shares, will not be able to do so till 48 hours after the announcement of results. That is what has pulled down prices on Friday.