Scott Bessent has a problem his administration built for him. The Iran war launched on 28 February closed the Strait of Hormuz, removed roughly a fifth of the world’s daily oil supply and pushed Brent above $109 a barrel. The UST 10-year yield has risen to about 4.37%. Markets price zero Fed rate cuts for the rest of the year. Mortgage rates are climbing back toward levels that cost his party seats in previous cycles.

Everything in the Bessent framework (his stated target of 3% growth, 3% deficits and 3 million barrels per day of additional oil production) depends on keeping the 10-year yield low enough that ordinary Americans feel the housing market is within reach. The war has made that task harder than anything the bond market has thrown at a Treasury Secretary since the Volcker years.

What makes Bessent different from most of his predecessors, though, is that he spent decades on the other side. He ran macro at Soros Fund Management. He founded Key Square Capital. He made his career not by predicting where markets would go, but by reading the mechanical forces that push them there, and positioning before the machinery fired. He is, by training and instinct, a macro trader. And the way he manages Treasury policy looks, on close inspection, like the way a skilled options trader manages a book. Bessent has never described his approach in these terms. But the structural logic maps so precisely that the analogy is worth pursuing.

To see why, we need a concept from options markets that applies far beyond them.

The ball on the hilltop

Imagine a ball resting on the crown of a hill. A gust of wind nudges it two inches to the left. Gravity now pulls it further left. It accelerates. A small push became a large move, because the surface curved away beneath it. In options language, the ball was in a short gamma position: any displacement from equilibrium gets amplified.

Now picture the same ball sitting in a valley. The same gust nudges it two inches. Gravity pulls it back toward the centre. The surface curves upward around it, absorbing the energy. A small push stays a small move. The ball is in a long gamma position: displacement gets dampened.

Gamma, a concept borrowed from options pricing, describes this distinction in financial markets. A market in a short gamma state is a ball on a hilltop – any push triggers mechanical forces that make the move larger. A market in a long gamma state is a ball in a valley: mechanical forces lean against the move and slow it down.

The mechanical forces in question are not sentiment or conviction. They are involuntary hedging operations. When banks and dealers hold large portfolios of options, they must continuously adjust their positions as prices move. In a short gamma regime, those adjustments run with the market: selling into falling prices, buying into rising ones. In a long gamma regime, they run against it. The hedging flows are automatic. They fire regardless of what any individual trader thinks about fundamentals. And they can dwarf the flows generated by voluntary human decisions.

A 15-basis-point rate hike by the Bank of Japan on 31 July 2024 — a move that caught the market off guard — triggered a 12% single-day crash in the Nikkei 225 and pushed the VIX to 65. The hike itself was small. But the market’s gamma state was deeply negative, and the hedging machinery turned a modest nudge into a cascade.

Three crises, three gamma signatures

The past two years offer three natural experiments. Each began with an exogenous shock. Each produced violent market moves. But the internal mechanics differed in ways that the gamma framework makes legible.

August 2024. The yen carry trade had accumulated for years. Speculators were short roughly 70,000 yen contracts on the CME. Dealers and structured product desks had sold options to finance carry positions, leaving the system aggregate short gamma. When the BOJ hiked, yen strengthened. Short gamma forced dealers to buy more yen, which strengthened the yen further, which triggered stop-losses on carry positions, which required buying still more yen. USD/JPY had been at 161 in early July; by 5 August it had crashed to 142, with the sharpest leg coming in the days after the hike. Open interest in yen futures collapsed: both the positions and their hedges disappeared together. The system de-grossed. When the BOJ signalled it would not hike again soon, the cascade reversed just as violently. A single decision by a single actor flipped the switch. V-shaped recovery.

April 2025. Trump’s Liberation Day tariffs hit on 2 April. The shock was informational, not a positioning unwind; nobody held “tariff carry trades.” Speculators scrambled to build new positions. Yen longs surged to a record 147,000 contracts in a matter of weeks as money fled the dollar. Open interest expanded. The system was not de-grossing; it was adding new hedging structures to cope with new uncertainty. UST 10-year yields first fell (safe haven reflex), then spiked to 4.51% as margin calls forced leveraged players to sell even their Treasury holdings. The safe haven function broke. VIX hit 52. Then Trump paused the tariffs on 9 April. One decision, one actor, binary reversal. Markets rallied sharply over the following months; the S&P 500 gained 9.5% on the day of the pause alone. Another V-shaped recovery.

March–April 2026. The Iran war. Oil above $100, Hormuz effectively closed, Brent at $109. Again an information shock. Speculators built yen shorts at speed, from +11,500 contracts to -67,800 in three weeks, one of the sharpest reversals in the CFTC record. Open interest is expanding, as in April 2025. But the catalyst is different in kind. A tariff can be paused by executive order. A war cannot. Even a ceasefire would not immediately reopen Hormuz or repair damaged infrastructure. The ECB’s Lagarde told the G7 as much, arguing that the physical damage to energy supply chains would persist for months regardless of diplomacy.

The gamma framework predicts a different resolution shape. The previous two crises ended with a binary off-switch that collapsed uncertainty to zero in a single moment, releasing all the accumulated gamma energy in one burst. The current crisis has no such switch. Uncertainty will decline in stages: partial ceasefire, gradual Hormuz reopening, slow oil normalisation. The gamma should unwind in waves rather than a single cascade. If that prediction holds, the coming recovery (whenever it arrives) will be a grind, not a V.

Reading the CFTC through gamma

The Commodity Futures Trading Commission publishes weekly positioning data. Most commentary treats this as a directional indicator: speculators are net short yen, therefore bearish yen. That reading is weaker than it appears.

A large share of futures positions are delta hedges – the mechanical offset of an options position held elsewhere, often in opaque over-the-counter markets. The BIS estimated the total yen carry trade at roughly ¥40 trillion ($250 billion) ahead of the August 2024 crisis; the CFTC-visible futures component was perhaps 3-4% of that. A fund showing “short 120,000 yen contracts” on the CME may hold an equivalent long yen position through OTC forwards. The futures leg is visible; the OTC leg is not. The CFTC captures the shadow of positions whose true direction is hidden.

But if you read the data as a gamma indicator rather than a directional one, it becomes more useful. Open interest measures how much mechanical rebalancing energy is stored in the system. When OI is high and expanding, a lot of hedging machinery is primed to fire when a catalyst arrives. The direction of CFTC positioning is noisy. The magnitude of the stored gamma – how violent the eventual release will be – is a cleaner signal.

The August 2024 unwind confirms this. Open interest collapsed as positions and hedges disappeared together. The CFTC wasn’t showing you a directional bet unwinding; it was showing you the gamma draining out of the system. When OI fell, the potential for further amplification fell with it. By the time the system was de-grossed, the overshoot was over.

In the current episode, OI is still expanding. JPY open interest rose 17,000 contracts in the latest week. S&P 500 futures OI grew by 69,000. The gamma reservoir is filling, not draining. Whatever catalyst eventually resolves the Iran uncertainty will release more stored energy than was available a month ago.

Bessent as gamma manager

Here is where the framework becomes specific to Bessent, and where his career history matters.

An options trader reads the gamma map and positions to profit when a catalyst releases the pressure. Bessent did exactly this at Soros from 2012 to 2015, when he identified the BOJ’s forced JGB buying under Abenomics as a mechanical flow that would persist regardless of what markets thought. The Wall Street Journal dubbed him “The Man Who Broke the Bank of Japan”; the Abenomics trade returned roughly $3.5 billion. He did it again at Key Square, positioning for the moment the BOJ’s yield curve control would break.

As Treasury Secretary, he operates the same logic from the other side. He does not predict where yields will go. He engineers the conditions under which moves are orderly rather than disorderly – reshaping the gamma surface of the markets he needs to manage. Each policy lever maps to a specific gamma intervention.

The sanctions waivers on Iranian and Russian oil are synthetic long gamma injected into the energy market. By releasing 270 million barrels of sanctioned crude onto the market, Bessent creates a perceived ceiling on oil prices. Any trader considering a long oil position above $110 must weigh the risk that Treasury dumps more supply to cap the move. The waivers do not solve the physical supply problem. They change the payoff structure for speculators, dampening upside momentum – the same function a long gamma position serves in an options portfolio. The Iranian waiver expires on 19 April. Whether he extends it will depend on the same data we can observe: is the system self-insuring, or is fragility rebuilding?

The Treasury buyback programme is slow-acting structural gamma. By purchasing older, less liquid long-dated Treasuries and funding them with new bill issuance, Treasury shortens the duration of outstanding government debt and supports long-end prices. It is not quantitative easing; Treasury cannot print money. But it creates a persistent bid under the long end that dampens sell-offs. The buyback cap was raised to $38 billion per quarter and frequency was doubled. Each quarter this runs, the baseline fragility of the UST market declines.

The eSLR reform, effective 1 April 2026, is the sleeper. By loosening the leverage ratio treatment of bank Treasury holdings, it removes a disincentive for the largest banks to hold government bonds. The reform does not force banks to buy Treasuries. But it changes their profit-maximising behaviour so that holding more USTs is the rational response – structural demand that compounds over quarters. Like the buyback programme, this is not a crisis tool. It is a slow gamma intervention that reduces the system’s vulnerability to the next shock.

The January 2026 rate check was the most explicit gamma management. When JGB disorder threatened to cascade into UST selling, Bessent (through coordinated signals with Tokyo) established a credible intervention boundary on USD/JPY. Before the rate check, any yen weakness triggered more selling, which triggered more weakness – short gamma. The rate check inserted a floor: beyond a certain speed of yen depreciation, the authorities would intervene. That boundary converted the system from short gamma (amplifying) to long gamma near the boundary (dampening). The current CFTC data (yen shorts covering from -67,800 toward -46,200 while USD/JPY holds at 160) suggests the boundary is still credible. The shorts are voluntarily reducing, which means each week fewer contracts remain to be forcibly covered in a panic. The system is self-insuring at the boundary Bessent established three months ago.

The state assessment

Pull the threads together, and Bessent is running a weekly state assessment across four gamma channels – oil, USTs, yen and equities. In each channel he asks the same question: is the system self-insuring (long gamma, dampening) or is fragility rebuilding (short gamma, amplifying)?

As of the latest CFTC data (positions as of 31 March), the read is mixed. Yen gamma is shrinking: the shorts are covering, intervention credibility holds, the FX channel is becoming less fragile. Equity gamma is growing: dealers absorbed 157,000 new S&P 500 shorts in a single week, expanding their exposure and the potential for mechanical amplification on the next large move. Oil is bounded by the sanctions waivers and IEA strategic reserve release, but that boundary has an expiry date. Rates are elevated but not disorderly.

In his framework (and in ours) that puts us in a transitional state. The most dangerous channels (FX, oil) are being managed. The secondary channel (equities) is loading up. His interventions are buying time, not resolving the underlying problem. And the underlying problem – the war, the physical damage, the Hormuz closure – remains outwith his control.

The macro trader’s instinct would say: when your tools are managing gamma at the boundaries but not solving the fundamental, the position is survivable but not comfortable. You hold it and wait for the catalyst you cannot manufacture. If the war ends by late May, the accumulated gamma in equities and rates unwinds as a grind-up rather than a crash-down. If it drags through summer, the gamma keeps building in channels he has fewer tools to manage, and the risk of a correlated cascade – oil, rates, yen and equities all amplifying each other simultaneously – grows with each week.

Bessent, by training and by temperament, will keep reshaping the surface beneath the ball. Whether the wind cooperates is another matter.

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