At market open, several Nifty 500 stocks recorded notable movements, driven by quarterly earnings results and broader trading activity during an active earnings season. Hitachi Energy, Vijaya Diagnostics, BLS International Services, and Concord Biotech emerged as top gainers, while Aditya Birla Fashion and Retail, Kaynes Technology, NLC India, and Ola Electric Mobility faced selling pressure.

Top Gainers

Hitachi Energy shares rose over 7% at market open after the company reported strong first-quarter results, with revenue climbing 68.6% year-on-year to ₹2,494 crore from ₹1,478 crore. The company, formerly known as ABB Power Grids before Hitachi's acquisition and rebranding, is a major supplier of power grid technology and high-voltage transmission equipment—a segment seeing increased order inflows as India expands and modernises its electricity grid to accommodate rising renewable energy capacity. The stock has surged more than 90% since the beginning of the year and 69% over the past year. It currently trades about 10% below its 52-week high of ₹38,785 and 118% above its 52-week low of ₹16,111. More than 2 lakh shares changed hands at 1.81 times the stock's 10-day average volume.

Vijaya Diagnostics shares gained nearly 6% at market open. The Hyderabad-based diagnostic chain operates primarily in South India and competes with larger national players such as Dr. Lal PathLabs and Metropolis Healthcare in the diagnostics services market. The stock is up approximately 6% year-to-date but has declined more than 11% over the past year. It trades roughly 4% below its 52-week high of ₹1,440 and 63% above its 52-week low of ₹848. Over 3 lakh shares were traded at 2.09 times the 10-day average volume.

BLS International Services shares advanced almost 3% at market open. The company provides visa processing, consular services, and digital services to governments globally. Despite the uptick, the stock has fallen over 20% year-to-date and 35% over the past year. It sits approximately 58% below its 52-week high of ₹399.15 and nearly 15% above its 52-week low of ₹218.90. More than 35 lakh shares were traded at 2.72 times the 10-day average volume.

Concord Biotech shares rose over 3% at market open. The company manufactures active pharmaceutical ingredients and finished formulations in the biotechnology segment, catering to both domestic and international markets. The stock has climbed nearly 19% year-to-date and over 25% in the past year. It trades about 27% below its 52-week high of ₹1,801.90 and 43% above its 52-week low of ₹987. Over 1 lakh shares were traded at 0.58 times the 10-day average volume.

Top Losers

Aditya Birla Fashion and Retail shares declined up to 8% since market open. The company operates one of India's largest fashion retail portfolios, including brands such as Louis Philippe, Van Heusen, Allen Solly, and Pantaloons, and has been expanding its presence in the fast-growing D2L (direct-to-label) and ethnic wear segments through acquisitions. The stock has fallen over 23% year-to-date but remains up 5.78% over the past year. It trades approximately 62% below its 52-week high of ₹94.95 and about 9% above its 52-week low of ₹53.51. Over 1 crore shares were traded at 1.55 times the 10-day average volume.

Kaynes Technology shares fell over 7% at market open after the company reported weaker-than-expected first-quarter results. Net profit dropped 24.2% year-on-year to ₹56 crore from ₹75 crore. The company is a player in India's electronic manufacturing services (EMS) sector, which has benefited from the government's Production Linked Incentive (PLI) schemes aimed at boosting domestic electronics production. The stock has risen over 3.26% year-to-date and nearly 35% over the past year. It trades roughly 102% below its 52-week high of ₹7,705 and 27% above its 52-week low of ₹2,995. Over 24 lakh shares were traded at 1.38 times the 10-day average volume.

NLC India shares declined over 6% at market open following weak Q1 results, with net profit falling 39.3% year-on-year to ₹484.2 crore from ₹797.5 crore. The state-owned company is primarily engaged in lignite mining and thermal power generation, and has been diversifying into renewable energy. The stock has risen nearly 13% year-to-date and approximately 24% over the past year. It trades about 34% below its 52-week high of ₹387.80 and over 30% above its 52-week low of ₹222. More than 35 lakh shares were traded at 1.86 times the 10-day average volume.

Ola Electric Mobility shares dropped over 4% at market open after the company reported a weaker first quarter, with revenue declining 45% year-on-year to ₹455 crore from ₹828 crore. The company is India's largest electric two-wheeler manufacturer by sales volume, operating in a market that has faced demand headwinds following the reduction of government subsidies under the FAME-II scheme. The stock has fallen nearly 0.71% year-to-date and 21% over the past year. It trades approximately 74% below its 52-week high of ₹71.25 and 83% above its 52-week low of ₹22.25. Over 3 crore shares were traded at 0.58 times the 10-day average volume.