The stock dipped 8% to Rs 159 on the BSE.
The stock hit a new high of Rs 437, and has zoomed by 93% in the past six trading sessions on the NSE from Rs 226 on May 21.
On May 28, Sundaram Mutual Fund purchased 170,000 equity shares of Ador Welding at Rs 209.50 per share.
At 11:37, the Sensex was trading higher by 295 points at 27,802 mark and the Nifty gained 92 points at 8,411
HPCL surged 6% to Rs 674, while BPCL hit a new high of Rs 852 on the NSE in intra-day trade.