Nifty 50 CAS Green Candle: 10 Consecutive Sessions Without a Red Candle in the Last 15 Minutes
The Nifty 50 has recorded an unusual pattern after the implementation of the Closing Auction Session (CAS), with the index witnessing a green CAS candle in the final 15-minute closing session for 10 consecutive trading sessions.
Regardless of whether Nifty traded higher or lower during the regular market session, the final CAS phase has consistently produced a positive move. This unusual streak has raised questions about whether the new closing mechanism is creating a market pattern that was rarely seen under the earlier closing methodology.
Nifty 50 CAS Green Candle Data
10 Consecutive Sessions, 10 Green CAS Candles
From 3 August through 14 August 2026, covering 10 consecutive trading sessions, the Nifty 50 recorded a positive CAS candle every session.
The size of the move varied significantly. The first two sessions produced exceptionally large moves of 200 points and 152 points, while subsequent sessions recorded smaller gains. Even so, the notable feature is that the CAS candle remained green throughout the entire 10-session period.
This makes the current CAS pattern particularly interesting because the direction of the broader session did not appear to prevent a positive move during the closing auction phase.
From VWAP Closing to the “CAS-ino” Green Candle?
Historically, traders closely watched the VWAP-based closing process and the final stages of normal market trading to understand the closing direction. The newly introduced CAS mechanism creates a different closing environment.
The current streak has led to the market nickname “CAS-ino” Green Candle—a reference to the unusually consistent last-15-minute green moves and the dramatic price swings that can occur during the closing auction.
However, the streak alone does not prove manipulation or a guaranteed trading opportunity. The CAS mechanism is relatively new, and a larger sample of sessions is required to determine whether this is a recurring market characteristic or simply an unusual early pattern.
The Expiry-Day Options Shock
The most eye-catching part of the new closing mechanism has been the extreme movement seen in some options during the final minutes.
During two expiry sessions, traders observed examples where an option premium around ₹2 reportedly surged toward ₹150 near the closing 15-minute period.
Such a move represents an extraordinary percentage change and highlights the potential impact of sudden changes in the underlying index, volatility, liquidity and order matching during the closing phase.
Why the 10-Session Pattern Matters
The important question is not simply whether Nifty produced 10 green candles. The bigger question is whether the CAS is creating a new recurring closing-market behaviour.
Three aspects stand out:
10 consecutive green CAS candles
Large initial moves of +200 and +152 points
Extreme option-premium movements during expiryThe phenomenon has been dubbed the “CAS-ino Green Candle” because of the unusually sharp closing movements and the dramatic option-premium swings witnessed around expiry.
Whether this becomes a repeatable market pattern or disappears as more CAS sessions accumulate remains to be seen. For now, the 10-session streak is a notable development worth monitoring rather than treating as a guaranteed trading signal.