Essays
Tagged "equities"
11 essays touching on equities.
Rho: The Greek That Only Shows Up When You Wait Long Enough
Between 2022 and 2023, the Fed's fastest rate-hiking cycle in four decades and the RBI's own climb from 4% to 6.5% quietly changed how much every stock option granted to an employee in the US or India was worth on paper — not because any company performed differently, but because the risk-free rate buried inside the Black-Scholes formula moved.
Between 2022 and 2023, the Fed's fastest rate-hiking cycle in four decades and the RBI's own climb from 4% to 6.5% quietly changed how much every stock option granted to an employee in the US or India was worth on paper — not because any company performed differently, but because the risk-free rate buried inside the Black-Scholes formula moved. That sensitivity is called rho, and it's the one Greek a trader on India's weekly-options-dominated market can go an entire career without ever needing to check — until the option in question is built to last years, not days. What rho actually measures, why it barely matters where India trades the most, and where it quietly matters enormously — with paired Indian and international examples throughout.
Surya · 7 min read
Vega: The Price of Not Knowing What Happens Next
On 4 June 2024, India's VIX spiked 51% in a single session and the Nifty fell nearly 6% on Lok Sabha election counting day — while six years earlier and a market away, a $1.9 billion fund built on the opposite bet shrank to $63 million in one afternoon.
On 4 June 2024, India's VIX spiked 51% in a single session and the Nifty fell nearly 6% on Lok Sabha election counting day — while six years earlier and a market away, a $1.9 billion fund built on the opposite bet shrank to $63 million in one afternoon. Vega is the Greek that measures an option's exposure not to which way the market moves, but to how much the market suddenly expects it might. What vega actually measures, who is structurally exposed on each side of it, and why both a crash and a collapse trace back to the same mechanic — with paired Indian and international examples throughout.
Surya · 8 min read
Gamma: The Feedback Loop Hiding Inside Every Delta Hedge
GameStop rose from $19.95 to an intraday high of $483 in eleven trading days in January 2021 — a move popularly blamed on a gamma squeeze, even though the SEC's own 2021 staff report found the options data didn't clearly support that story.
GameStop rose from $19.95 to an intraday high of $483 in eleven trading days in January 2021 — a move popularly blamed on a gamma squeeze, even though the SEC's own 2021 staff report found the options data didn't clearly support that story. In India, SEBI's July 2025 interim order accused the trading firm Jane Street of a different relationship to the same mechanic: engineering, rather than just reacting to, the price sensitivity that peaks in at-the-money options on an expiry afternoon — allegedly worth ₹4,843.57 crore across 18 expiry days. Gamma measures how fast delta itself changes, and it's highest exactly where that sensitivity turns from a stabilizing force into an accelerant. What gamma actually measures, who has to react to it fastest, and what happens when someone decides to manufacture it instead — with paired Indian and international examples throughout.
Surya · 8 min read
Internalization: The Book-to-Book Trade That Skips the Exchange
Two clients want opposite things. Does their broker send that to a market — or just settle it in-house?
Two of a broker's clients want opposite things — one to buy, one to sell, at the same price. In the US, the broker can match them right there on its own books, no exchange involved. In India, the law makes that arrangement close to impossible for the same trade. What internalization actually is, why most US retail orders never touch a public exchange, and why India's market structure sends every one of them there anyway.
Surya · 8 min read
Delta: The Gear Ratio Between an Option and Its Stock
In FY24, India's proprietary trading desks and FPIs made roughly ₹61,000 crore in the same options market where individual traders posted their steepest losses — and SEBI's own numbers show 96–97% of that institutional profit came from algorithms doing one thing continuously: measuring an option's delta and rebalancing to stay flat.
In FY24, India's proprietary trading desks and FPIs made roughly ₹61,000 crore in the same options market where individual traders posted their steepest losses — and SEBI's own numbers show 96–97% of that institutional profit came from algorithms doing one thing continuously: measuring an option's delta and rebalancing to stay flat. Delta is the gear ratio between an option's price and its underlying stock, and the same mechanism that lets a market maker quote prices safely also amplified one of the world's most infamous crashes. What delta actually measures, who structurally lives by it, and why a hedging strategy called portfolio insurance once made a falling market fall faster — with paired Indian and international examples throughout.
Surya · 7 min read
Equities: The Business Line Priced Off One Company
Equities is the half of a bank's trading floor that FICC isn't — shares, priced off one company's fundamentals instead of the macroeconomy.
Equities is the half of a bank's trading floor that FICC isn't — shares, priced off one company's fundamentals instead of the macroeconomy. What sits inside the Equities business, how it differs structurally from FICC, and how it plays out in India versus global markets, with paired examples throughout.
Surya · 9 min read
Payment for Order Flow: The Free Trade Someone Still Paid For
A US retail broker's zero-commission trade and an Indian discount broker's flat-fee trade look like the same idea, priced two different ways.
A US retail broker's zero-commission trade and an Indian discount broker's flat-fee trade look like the same idea, priced two different ways. They're not funded the same way at all — one runs on payment for order flow, a practice India's market structure barely lets exist and the EU banned outright in 2024. What PFOF actually is, why it created a real conflict of interest regulators had to act on, and why the same problem can't even arise the same way in India — with paired examples throughout.
Surya · 6 min read
Securities Lending: The Share Sold Short More Than Once
In January 2021, more of GameStop's stock had been sold short than existed to be sold — 140% of its entire public float.
In January 2021, more of GameStop's stock had been sold short than existed to be sold — 140% of its entire public float. Not a data error: the same borrowed share had been shorted, bought, and lent out again more than once. What securities lending and short selling actually are, why India cleared this market through an exchange while the US left it bilateral, and why that structural choice is exactly what let GameStop's number climb as high as it did — with paired Indian and international examples throughout.
Surya · 6 min read
The Greenshoe Option: The Bank That Shorts the Stock It Just Sold
For up to 30 days after a company goes public, the underwriter that sold its stock to the world can be secretly short it — selling more shares than the company actually issued, then deciding after the fact whether to cover that short by buying in the open market or by exercising an option to buy fresh shares from the company itself.
For up to 30 days after a company goes public, the underwriter that sold its stock to the world can be secretly short it — selling more shares than the company actually issued, then deciding after the fact whether to cover that short by buying in the open market or by exercising an option to buy fresh shares from the company itself. What the greenshoe option actually is, why it's named after a shoe company, and why India's IPO market needed it most in exactly the years global markets needed it least — with paired Indian and international examples throughout.
Surya · 7 min read
Theta: The Cost of Being Right Too Late
93% of Indians who traded equity options for three straight years lost money doing it — not to a bookmaker, but to time itself.
93% of Indians who traded equity options for three straight years lost money doing it — not to a bookmaker, but to time itself. Theta is the name for an option's daily loss of value purely from time passing, and it accelerates hardest in the final days before expiry, exactly where retail traders in India and the US have both been piling in. What theta actually is, who structurally collects it, and why regulators on both sides eventually stepped in — with paired Indian and international examples throughout.
Surya · 7 min read
Volatility: The Fear That Moves Faster Than the Calm
The VIX has closed above 80 exactly twice in its history — both times during a crash, never during a rally.
The VIX has closed above 80 exactly twice in its history — both times during a crash, never during a rally. Volatility isn't just a side effect of price moves; it's become a tradable asset in its own right, and it responds to falling prices and rising ones in fundamentally different ways. What implied volatility and the VIX actually are, why fear spikes harder than calm ever climbs, and why India's own attempt to trade this asset failed once already — with paired Indian and international examples throughout.
Surya · 7 min read