Shares of Simplex Infrastructure fell over 3 per cent in morning trade on Tuesday.
At 10.35 am, the stock was down 3.69 per cent or Rs 15.80 at Rs 412 on the BSE.
Citigroup sold 283,500 shares in the company through bulk deals on Monday, according to the BSE.
Exits by large investors like Citi, generally, create a bearish sentiment in the stock, traders said.