Gainers & Losers: Top stocks that moved the most on August 21

Nifty extends winning steak for 6th day

Benchmark indices Nifty and Sensex stretched their winning run to a sixth straight session on Thursday, August 21, lifted by pharma, oil & gas and banking stocks. The midcap index, however, broke its three-day rally to end lower, while weakness in autos, FMCG and PSU banks also capped the upside.

Shares of capital market-related companies, including broking, exchange and data-related platform and depository clearing houses, were under pressure with the Nifty Capital Market index falling over 1 percent on August 21 after India's markets regulator, Securities and Exchange Board of India (Sebi), said that it is looking for ways to increase the tenure and maturity of equity derivatives contracts.

Jupiter Wagons | CMP: Rs 341 | The stock jumped over 13 percent on August 21 as its unlisted subsidiary, Jupiter Tatravagonka Railwheel Factory Pvt. Ltd., has received a Letter of Intent dated August 19, 2025, to supply 5,376 wheelsets for the Vande Bharat train. The order is valued at about Rs 215 crore.

Zinka Logistics | CMP: Rs 618 | The stock surged 5 percent on August 21 after it reported a strong operational performance with adjusted earnings before interest, taxes, depreciation, and amortisation (Ebitda) growing 290 per cent year-on-year (Y-o-Y) in Q1FY26.

Insurance stocks | Shares of insurance players saw some cheer in trade on Thursday, August 21, after reports suggested that life and health insurance purchased by individuals may be exempt from the 18 percent Goods and Services Tax (GST) that is currently levied. The GST Group of Ministers (GoM) on insurance has proposed that health and life insurance premiums be exempted from the levy, in a move aimed at making insurance products more affordable and improving penetration in India’s underinsured market.

Clean Science & Tech | CMP: Rs 1,148 | The stock saw some recovery from day's low with ended with 2 percent loss on August 21 after the firm clarified that a 'punching error' led to the sharp swings in the stock price and extraordinary volumes.The firm clarified that as a result of an error from broker Spark Avendus, over six crore shares changed hands in the block deal, while only 2.5 crore shares were set to be exchanged. As a result, the stock sank seven percent in trade trade.

HDB Financial Services | CMP: Rs 796 | The stock surged by a percent on August 21 as Motilal Oswal initiated coverage on newly listed non-bank HDB Financial Services Ltd with a 'neutral' outlook, believing that the firm can offer high-teens growth in its assets under management over the next few year. The brokerage kicked off coverage with a 'neutral' rating, and a target price of Rs 860 per share, which indicates a nine percent upside.

Nazara Tech | CMP: Rs 1,193 | Nazara Technologies Ltd saw further selling pressure in trade on Thursday, August 21, after the Lok Sabha passed the Promotion and Regulation of Online Gaming Bill, 2025. The bill aims to prohibit all pay-to-play online games, including both games of skill and chance. If passed, the bill would pause the total operations of regulated real-money gaming (RMG) platforms across India.

RailTel Corporation | CMP: Rs 361 | The stock jumped up to 4 percent after the company announced securing multiple orders cumulatively worth over Rs 50 crore. The public sector enterprise received an order of Rs 34.99 crore from the Kerala State Information Technology Mission and another order of Rs 15.42 crore from the Higher Education Department of Odisha.

Hexaware Tech | CMP: Rs 805 | Shares of Hexaware Technologies rose 4 percent to Rs 807 on Thursday after Nuvama Institutional Equities initiated coverage on the stock with a ‘buy’ rating and a target price of Rs 950 per share, citing strong growth prospects and an attractive valuation following the recent correction. The price target implies an upside potential of 23 percent.

Interglobe Aviation | CMP: Rs 6,098 | Shares of InterGlobe Aviation, the operator of IndiGo, fell 2 percent on August 21 after Kotak Institutional Equities downgraded the stock to “add”, even as it maintained a target price of Rs 6,850, implying an upside potential of 14 percent from current levels.