Essays
Tagged "markets"
51 essays touching on markets.
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
Off-Market Transfer: The Share That Moves Without a Trade
Not every share that changes hands was ever bought or sold.
Every mechanism in this series so far assumed a trade started the chain. An off-market transfer skips the exchange, the clearing corporation, and novation entirely — ownership simply moves from one ledger entry to another.
Surya · 7 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
Block Trading: One Price, Negotiated Before the Market Moves
Every other trade finds its price by colliding two orders in public.
Every other trade finds its price by colliding two orders in public. A block trade agrees on the price first, in private, then tells the market what happened afterward — and both India's fully-lit window and the US's dark pools share the exact same weak point: the moment before the window opens, when a human being already knows the order is coming.
Surya · 13 min read
Equity Desk, Bond Desk, F&O Desk: Same App, Three Different Games
Every Indian broking app shows the same three tabs — Equity, F&O, and Bonds — styled like variations of one button.
Every Indian broking app shows the same three tabs — Equity, F&O, and Bonds — styled like variations of one button. They aren't. One is ownership, one is a loan negotiated more often on the phone than on a screen, and one is a bet with an expiry date. What actually separates the three desks, with Indian and global examples throughout.
Surya · 12 min read
Commodities: The Only Trade You Could Drop On Your Foot
Commodities is the FICC desk that prices physical goods — oil, gold, wheat, copper — instead of a company or a currency.
Commodities is the FICC desk that prices physical goods — oil, gold, wheat, copper — instead of a company or a currency. Why that physical fact changes everything about how the desk works, how India's gold-and-agriculture market differs from global energy and metals markets, and why hedging, not speculation, is the real business, with paired Indian and global examples throughout.
Surya · 10 min read
Commodity Derivatives: The Barrel That Cost Less Than Nothing
A commodity derivative prices something every other derivative in this series doesn't have to worry about: a physical thing that has to be stored somewhere until delivery.
A commodity derivative prices something every other derivative in this series doesn't have to worry about: a physical thing that has to be stored somewhere until delivery. That single fact is why, on 20 April 2020, a barrel of oil traded below zero — first in the US, then in India, for a different reason six hours later. What commodity forwards, futures, options and swaps actually are, why storage cost and convenience yield bend the forward curve in ways interest rates never do, and what a settlement-price system built on the wrong assumption looks like when it breaks — with paired Indian and international examples throughout.
Surya · 8 min read
Currency Derivatives: The Gap Arbitrage Was Supposed to Close
Covered interest rate parity says a currency's forward rate is pure arithmetic — spot, adjusted for the interest-rate gap between two currencies, nothing more.
Covered interest rate parity says a currency's forward rate is pure arithmetic — spot, adjusted for the interest-rate gap between two currencies, nothing more. Since 2008, the actual market price has quietly disagreed, by an amount called the cross-currency basis. What FX forwards, FX swaps, cross-currency swaps and currency options actually are, why that gap should have been arbitraged away and wasn't, and why it blows widest open exactly when a country needs dollar funding most — with paired Indian and international examples throughout.
Surya · 9 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
Interest Rate Derivatives: The Cut the Market Already Priced In
Interest rate derivatives are contracts whose payoff comes from a rate benchmark itself — not a bond, not a loan, not a company.
Interest rate derivatives are contracts whose payoff comes from a rate benchmark itself — not a bond, not a loan, not a company. They're FICC's largest single product family by notional, and the one a Rates desk reaches for whenever a central bank is about to move, especially into a slowdown. What FRAs, interest rate swaps, rate futures, caps, floors and swaptions actually are, how they sit inside FICC, and why the market usually finishes trading a rate cut months before the committee that decides it ever meets — with paired Indian and international 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
Securitization: One Pool of Loans, Wearing Different Credit Ratings
Securitization pools ordinary loans into a legally separate vehicle and slices the cash flows into tranches — senior, mezzanine, equity — that get paid in a fixed order.
Securitization pools ordinary loans into a legally separate vehicle and slices the cash flows into tranches — senior, mezzanine, equity — that get paid in a fixed order. The same pool of loans can back a AAA-rated slice and a junk-rated slice at once, because the rating describes the slice's place in the payment order, not the loans underneath it. What securitization actually is, why that structure worked exactly as designed for decades before 2008 broke the one assumption it depended on, and what changed in the rules afterward — with paired Indian and international examples throughout.
Surya · 7 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
Credit Default Swaps: Protection Nobody Has to Own
The bond never changes hands. The default risk does — and so can anyone's opinion of it.
A credit default swap looks like insurance on a bond — a premium now, a payout if the borrower defaults. Real insurance requires you to actually own the thing you're insuring. A CDS never checks. That single missing requirement is where a market for hedging credit risk quietly became a market for betting on it.
Surya · 8 min read
FICC: The Business Line Where Nothing Is Priced Off One Company
FICC stands for Fixed Income, Currencies and Commodities — the half of a bank's trading floor that prices interest rates, exchange rates and raw materials instead of company earnings.
FICC stands for Fixed Income, Currencies and Commodities — the half of a bank's trading floor that prices interest rates, exchange rates and raw materials instead of company earnings. What the term means, why banks bundle these three together, and how it plays out differently in India, with paired Indian and global examples throughout.
Surya · 10 min read
Allocation: One Block Trade, Many Owners
A broker rarely executes one client's order at a time.
A broker rarely executes one client's order at a time. It executes one block, then decides afterward who actually owns which piece — and that decision is where fairness either holds or quietly breaks.
Surya · 8 min read
Convexity: Why the Bond Fell Less Than Duration Predicted
Duration treats the relationship between a bond's price and its yield as a straight line — accurate right at today's rate, and increasingly wrong the further rates move.
Duration treats the relationship between a bond's price and its yield as a straight line — accurate right at today's rate, and increasingly wrong the further rates move. Convexity is the curve duration misses, and for an ordinary bond, it bends in the holder's favor every time.
Surya · 6 min read
Credit Spread: The Extra Yield That Isn't About Interest Rates At All
Duration and convexity explain how a bond's price moves with the risk-free rate.
Duration and convexity explain how a bond's price moves with the risk-free rate. They don't explain why two bonds of identical maturity, issued the same day, can yield completely different amounts. That gap is credit spread — compensation for a risk duration was never built to measure.
Surya · 6 min read
Order Types: Nine Names for Three Instincts
Priya's about to buy Tata Motors on Zerodha.
Priya's about to buy Tata Motors on Zerodha. Jake's about to buy Tesla on Robinhood. Neither of them is choosing between nine order types — they're each answering the same question three different ways: how badly do you want this, right now?
Surya · 8 min read
Wrong-Way Risk: The Hedge That Fails Exactly When You Need It
A hedge is supposed to pay off when your main position loses.
A hedge is supposed to pay off when your main position loses. Wrong-way risk is what happens when the thing protecting you and the thing threatening you turn out to be tied to the same fate — so the protection weakens exactly when the danger is highest.
Surya · 7 min read
Bonds: The Fixed Deposit You Can Sell
A bond's coupon is frozen the day it's issued, so when the going rate rises the price is the only part left that can move.
A bond's coupon is frozen the day it's issued, so when the going rate rises the price is the only part left that can move. That's why bond prices fall when rates rise — not a rule to memorise, just the only arithmetic that works.
Surya · 5 min read
Duration: Why a 30-Year Bond Moves More Than a 1-Year Bond
The same 1% rate move barely dents a 1-year bond and guts a 30-year one.
The same 1% rate move barely dents a 1-year bond and guts a 30-year one. Duration is the number that explains why — how many years of frozen coupons are still waiting to be repriced.
Surya · 5 min read
Forwards: The Same Bet, Without the Safety Net
A forward is a futures contract with the exchange taken out — same obligation, same symmetric risk, but no daily cash, no clearinghouse, and no exit that doesn't run through the party you signed with.
A forward is a futures contract with the exchange taken out — same obligation, same symmetric risk, but no daily cash, no clearinghouse, and no exit that doesn't run through the party you signed with.
Surya · 6 min read
The Yield Curve: Why Short Rates and Long Rates Never Move Together
A bond's yield isn't one number — it's a different number for every maturity, and the curve those numbers trace is normally upward-sloping.
A bond's yield isn't one number — it's a different number for every maturity, and the curve those numbers trace is normally upward-sloping. When short-term lending pays more than long-term lending, the curve isn't broken. It's pricing in rate cuts nobody has announced yet.
Surya · 5 min read
Futures: The Bet That Settles Every Single Day
A futures gain isn't paper profit. It was already paid to you yesterday.
A futures gain isn't a number on paper until you close the position — it was already paid to you yesterday. Futures settle in cash every day the position is open, not once at expiry.
Surya · 5 min read
Options: The Right to Walk Away
One side can walk away from a bad price. The other side can't.
An option isn't a smaller bet on price direction — it's the purchase of a choice. The buyer's worst case is fixed and small. The seller's isn't.
Surya · 5 min read
Swaps: The Number That Never Moves
Ten crore changes nothing hands. Two and a half lakh does.
A swap's notional principal is never exchanged — it's just the number two parties agree to calculate against. What actually moves, every period, is only the difference between two artificial cash flows built on top of it.
Surya · 5 min read
Infrastructure: The Nine Systems Behind Every Trade
Nobody sees the machines that turn a click into a trade.
OMS, EMS, FIX, matching engines, CCPs, SWIFT, custodians — the machinery nobody sees between a click and a settled trade, and why almost none of it lives on a screen.
Surya · 5 min read
A Bank Trading Floor Is a Marketplace for Risk
What FX, Equities, Rates, Credit, Commodities and Prime Brokerage Actually Do
What FX, Equities, Rates, Credit, Commodities and Prime Brokerage Actually Do
Surya · 19 min read
Arrival Price: The Clock That Starts When You Decide
VWAP asks: did you trade in line with the market's average?
VWAP asks: did you trade in line with the market's average? Arrival price asks a sharper question: compared to the price the moment you decided to trade, how much did waiting actually cost you?
Surya · 5 min read
Iceberg Orders: The Trade That Hides Its Own Size
An order book shows everyone what's for sale, at what price, and how much.
An order book shows everyone what's for sale, at what price, and how much. An iceberg order breaks that last promise on purpose — showing a small slice of a much larger order, and quietly refilling it every time the slice gets taken.
Surya · 5 min read
Implementation Shortfall: The Cost of Time Between Deciding and Doing
Imagine a version of every trade that executed instantly, in full, at zero cost.
Imagine a version of every trade that executed instantly, in full, at zero cost. Implementation shortfall is the gap between that imaginary trade and the real one — and it's the number that finally accounts for every algorithm in this series.
Surya · 5 min read
POV: The Algorithm That Never Trades Alone
TWAP follows the clock.
TWAP follows the clock. VWAP follows a forecast of the day's volume. POV follows the market itself, live — trading a fixed share of whatever volume actually shows up, with no fixed finish time.
Surya · 5 min read
Sniper Algorithms: Waiting for the Moment That Matters
TWAP, VWAP, and POV all trade continuously, on some schedule.
TWAP, VWAP, and POV all trade continuously, on some schedule. A sniper algorithm does the opposite — it does nothing at all, for as long as it takes, until one specific condition appears. Then it fires.
Surya · 5 min read
TWAP: How to Buy a Mountain Without Moving the Price
A fund needs to buy ten million shares.
A fund needs to buy ten million shares. Buying them all at once would move the price against itself. TWAP solves this by refusing to rush — the same size trade, at fixed intervals, no matter what the market is doing.
Surya · 5 min read
VWAP: The Benchmark Every Trader Is Graded Against
TWAP ignores the market's rhythm.
TWAP ignores the market's rhythm. VWAP follows it — trading more when the market trades more, less when it doesn't. It's also the number every institutional trader gets measured against, whether they used the algorithm or not.
Surya · 5 min read
Capital Market System: Two Paths, One Market
Same stock. Different game.
A trader seeks a market move. A portfolio manager builds a market system. The same stock can be a quick trade for one person and a long-term building block for another.
Surya · 6 min read
Default Waterfall: Who Pays When a Clearing Member Fails
When a member fails, losses travel through a pre-built staircase.
A default waterfall is the pre-written loss sequence of a clearinghouse: it decides whose money absorbs a member default before panic gets to vote.
Surya · 8 min read
Margin: How a Clearinghouse Turns Fear Into Collateral
A clearinghouse turns future fear into collateral today.
Novation moves risk to the clearinghouse. Margin is how that inherited risk becomes measurable, funded, and survivable before anyone is allowed to trade.
Surya · 6 min read
Netting: How Finance Cancels a Mountain of Debt Into a Pebble
The market does not settle every promise. It compresses the mess.
Netting is the compression algorithm of finance: it turns a dense web of promises into the smallest enforceable payment that still preserves the truth.
Surya · 7 min read
Settlement Finality: When a Trade Stops Being a Promise
At some point, a trade must stop being reversible.
Execution creates the trade. Clearing organizes the obligations. Settlement finality is the moment the market can no longer unwind the result.
Surya · 7 min read
Novation: How a Clearinghouse Becomes Everyone's Counterparty
Two strangers trade. One institution becomes the promise.
A clearinghouse doesn't just guarantee a trade — it legally erases the original contract and writes two new ones. Novation is the substitution that makes an anonymous exchange safe.
Surya · 4 min read
Repo: The Overnight Loan That's Legally Two Trades
It looks like borrowing. Legally, ownership flips twice.
A repurchase agreement looks like a loan against collateral. Legally, it's two separate sales with a promise between them — and that difference decides who owns the collateral the moment someone defaults.
Surya · 8 min read
What a Trade Lifecycle Actually Looks Like
A trade is not done when two people agree on price.
Six pillars, one lifecycle — what actually happens between an order and a settled trade, and where a business analyst sits at each stage.
Surya · 4 min read
How Order Books Actually Work
A market price is not discovered by magic. It is negotiated in public.
A visual walk-through of bid/ask spreads, market depth, and why price moves the way it does.
Surya · 4 min read