The IT major's scrip plummeted 13.39 per cent to Rs 884.40 - its 52-week low level - on BSE.
At NSE, the stock crashed 13.38 per cent to hit its one- year low of Rs 884.20.
The stock was the worst performer among the bluechips on both the key indices.
The sharp plunge in the stock wiped out Rs 24,838.92 crore from its market valuation during the late afternoon trade.
Sikka resigned amid heightened acrimony between the board and the high-profile founders led by NR Narayana Murthy, saying he faced "false, baseless, malicious and increasingly personal attacks".
Sikka, 50, a former German IT major SAP executive who was roped in as CEO and MD of USD 10 billion revenue company three years back, has been appointed as the executive vice-chairman until a new MD and CEO is hired.
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