A team of officials of the regulatory authority recently visited the offices of the brokerage house to inspect its facilities with regard to the ongoing probe, sources said.
Besides, NSE has served a show-cause notice to the brokerage firm and will follow "due process" for further action, sources added.
Sebi is also working on addressing the broader concerns that have come to fore after a probe into alleged lapses involving NSE's co-location facility.
Speaking to reporters in Mumbai, Sebi Chairman U K Sinha today said the regulator is looking at imposing a bigger penalty for misuse of high-speed algo trades and is "following up" on full implementation of directions it issued in the case involving NSE.
"Sebi got its own examination and based on it, we gave certain directions. Majority of directions have been implemented but some have not.
"We are following up the matter with concerned agencies and this matter will be taken to its logical conclusion. We are steadfast on our findings," he said on the NSE matter.
Sebi began probing the matter in early 2015 after it received at least three complaints related to some brokers allegedly getting preferential access through co-location facility, early login and 'dark fiber'.
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