FNODATA Blog

The F&O playbook.

Practical, no-fluff guides on option chains, Greeks, strategies, India VIX and the expected move — written for Indian F&O traders.

Open InterestLatest

If Every Option Has a Buyer and a Seller, Why Do Big-OI Strikes Act as Support and Resistance?

Options are zero-sum — every written contract has a buyer on the other side. So why do traders treat heavy call OI as resistance and heavy put OI as support? A simple, honest answer.

8 July 2026·8 min read
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India VIX

A 30% India VIX Spike in One Day: What a Volatility Shock Does to Your Option Premiums

On 8 July 2026 India VIX jumped 30% and put premiums exploded as the market fell 2%. Here's exactly why a volatility shock re-prices options — and how to read one honestly.

8 July 2026 · 6 minRead →
Strategy

Should You Buy or Sell Options Before Earnings?

IV crush favours sellers, but the gap is the catch. How to weigh buying vs selling options into a result — and why defined risk is the question that actually matters.

8 July 2026 · 7 minRead →
India VIX

IV Crush Explained: Why You Can Be Right on Direction and Still Lose on Earnings

IV crush is why option premium collapses after earnings even if the stock moved your way. A clear, worked explanation of implied volatility crush and vega.

6 July 2026 · 7 minRead →
PCR

The Synthetic Future and Basis: The Real Level the Options Market Prices

Index spot is a non-tradable average. The synthetic future, from put-call parity, is the level options actually price — and the basis reveals the lean.

3 July 2026 · 5 minRead →
Expected Move

Results Season for Options Traders: How to Read a Stock Into Its Earnings

Earnings are a scheduled, binary volatility event. Learn the event premium, the expected move in points, and IV crush — before you place the trade.

3 July 2026 · 6 minRead →
Greeks

Why Most F&O Traders Lose — and the Case for Seeing the Trade First

SEBI found 93% of individual F&O traders lost money over FY22–FY24. The real problem isn't recklessness — it's that retail trades blind. The case for pre-trade clarity.

29 June 2026 · 5 minRead →
India VIX

Index Rebalancing Day: Why the Flows Matter More Than the Names

On a rebalancing day everyone asks which stocks are in and out. For F&O traders that's the least useful question. What matters is flow versus liquidity — and what it does to volatility, OI and the expected move.

29 June 2026 · 4 minRead →
Education

AI's Water Bill: The Hidden Resource Cost Behind the AI Boom

Everyone tracks AI's electricity bill — but AI also drinks water to cool its servers. What AI really consumes, why power and water are the scarce inputs behind the boom, and how markets are starting to notice.

26 June 2026 · 8 minRead →
Greeks

Why Cheap Options Explode on Expiry Day: Gamma Explained

On expiry day a ₹1 option can become ₹12 in minutes — and usually expires worthless. The mechanic: gamma, time decay and volatility, explained.

23 June 2026 · 4 minRead →
Expected Move

What Is the Expected Move? How to Read the Day's Range

The expected move is the range options are pricing in. Learn two ways to get it — the ATM straddle and India VIX — and how to use it.

22 June 2026 · 4 minRead →
PCR

Put-Call Ratio (PCR): What It Is and How to Read It

PCR is one of F&O's most quoted — and misunderstood — numbers. Learn OI vs volume PCR, why high PCR is often bullish, and how to read it.

21 June 2026 · 4 minRead →
Max Pain

Max Pain Theory Explained: How It Works & How to Use It

Max Pain is the strike where most option buyers lose at expiry. Learn how it's calculated, what 'expiry pinning' means, and how to use it.

20 June 2026 · 4 minRead →
Expiry

How to Read Intraday OI Change: Buildup & Unwinding

Open Interest shifts all day. Learn to read intraday OI change — Call vs Put buildup and unwinding, and what it means on expiry day.

18 June 2026 · 4 minRead →
Strategy

Iron Condor Explained: Structure, Payoff & Strikes

A practical guide to the iron condor option strategy — the four legs, the payoff, how to pick strikes with the expected move, and the Greeks.

15 June 2026 · 6 minRead →
India VIX

What Is India VIX? How to Read the Volatility Index

India VIX explained — what it measures, how to read its levels, the daily move it implies (VIX ÷ √252), and how traders use it.

14 June 2026 · 5 minRead →
India VIX

Option Greeks Explained: Delta, Gamma, Theta & Vega

A plain-English guide to the option Greeks — Delta, Gamma, Theta and Vega: what each measures, how it affects your positions, and how to use it.

14 June 2026 · 5 minRead →
PCR

How to Read the NIFTY Option Chain: A Practical Guide

Learn to read the NIFTY option chain like active traders do — strikes, LTP, OI, Change in OI, IV, volume and PCR — and how to use them.

14 June 2026 · 5 minRead →