SEBI, stock exchanges to step up vigilance on eve of results Similar additional safeguards have been effectively used during polls in Gujarat, Uttar Pradesh and other states in the recent past as well as the time of 2014 general elections Market regulator, the Securities and Exchange Board of India (Sebi) as well as stock exchanges have stepped up surveillance to keep a close tab on possible manipulations and excessive volatility in the markets ahead of assembly elections results in Karnataka.The results of the single-phase assembly elections will be declared on May 15. However, before the formal announcement of the results, several agencies conducted exit polls, predicting the outcome. The exit poll results for the election were announced after voting ended on May 12.A senior official said the markets regulator and stock exchanges have beefed up surveillance and risk management systems to check any manipulative activities and excessive volatility risks on Monday and Tuesday.