Dalal Street October 12, 2026: RBI’s Rupee Defence Hits Banks and Bonds

Monday was a strange split screen. On Dalal Street on October 12, 2026, the rupee had one of its better days in weeks, yet the Nifty 50 fell 157.10 points, or 0.70%, to 22,363.35 and the Sensex lost 547.65 points, or 0.76%, to 71,924.68. The reason both things happened together sits in a set of RBI measures announced to defend the currency.

Educational content only. Not investment advice. Nifty and sector figures are from NSE’s daily index file and stock prices from NSE’s bhavcopy for October 12, 2026; the Sensex, bond, rupee and flow data are from the reports linked below.

Dalal Street on October 12: what the RBI changed

Business Standard listed the package: a dedicated dollar window for state-owned oil companies, tighter rules on currency derivatives and a higher daily cash reserve requirement. From the fortnight beginning October 16, banks must keep at least 99% of their prescribed CRR every day, up from 90%.

The rupee liked it, strengthening nearly 1% to close at 95.78 a dollar, per the same report. Bonds did not. The 10-year government bond yield jumped 9 basis points to 7.39%, which Business Standard said was the highest since March 10, 2023. Draining cash from banks tends to push up short-term rates, and equities priced that in quickly.

How the Nifty got there

The Nifty actually opened higher at 22,593.20 and touched 22,651.10, according to NSE’s index file for October 12. It then gave up all of that and more, finishing at 22,363.35, not far above the day’s low of 22,304.45. Business Standard said the Sensex fell as much as 796.23 points during the session.

• Nifty FMCG: down 1.67%, the weakest major sector.
• Nifty PSU Bank: down 1.18%. Nifty Bank: down 0.61% at 54,918.00.
• Nifty IT: down 0.79%, giving back part of Friday’s TCS rally.
• Nifty Media: up 4.60%. Nifty Auto: up 0.90%. Nifty Realty: up 0.76%.
• Broader market: Nifty Midcap 100 was flat (up 0.08%) while Nifty Smallcap 100 rose 1.42%.
• India VIX: up 6.10% to 15.25.

Breadth was close to even. Among NSE’s EQ-series stocks, 1,315 closed higher and 1,346 closed lower. So this was a large-cap, bank-led decline, not a broad rout.

Banks carried the weight

State Bank of India fell 1.89% to ₹941.00 and ICICI Bank slipped 1.11% to ₹1,340.00. Business Standard estimated that banking stocks lost ₹30,610 crore in combined market value and accounted for 38 points of the Nifty’s fall.

Elsewhere, Apollo Hospitals was the biggest Nifty loser (down 3.15% at ₹7,775.00), followed by ITC (down 3.05%), Tech Mahindra (down 2.85%) and Larsen & Toubro (down 2.05%). On the other side, Dr Reddy’s Laboratories rose 2.71% to ₹1,229.40 and Bajaj Auto gained 2.62% to ₹10,034.00.

Flows and crude

Foreign investors kept selling. CNBC-TV18, citing provisional exchange data, said FIIs sold ₹1,708 crore of shares on the day while domestic institutions bought ₹3,045 crore. The same report said Brent had climbed to $106 a barrel, which weighed on oil-sensitive names such as IndiGo and Asian Paints.

We think October 12 is a good example of why a stronger rupee is not automatically good news for equities. How the RBI gets there matters. Tighter liquidity means higher yields, and higher yields hit bank valuations first. For the session before this one, see our recap of Sensex and Nifty on October 9. For a wider view on how policy moves shape trading, our primer on technical analysis for Indian stocks covers how to watch support levels on days like this.

Sources: NSE index closing values, October 12, 2026; NSE equity bhavcopy for October 12, 2026; Business Standard; CNBC-TV18 on FII/DII flows.

Disclaimer: This article is for information and education only and is not investment advice or a recommendation to buy or sell any security. Please do your own research or consult a SEBI-registered adviser before investing.