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Yen: 163,412 net short contracts before the shock

The 28 July COT shows 163,412 net contracts against the yen. It measures pre-shock positioning, not yet an unwind of the global carry trade.

8 min read#yen#carry trade#cftc#cot#boj#mof#positioning#markets
dated revision: August 02, 2026French originalprimary sourcesno tracker

The chart was published after the shock, but its data stop before it. The latest available Commitments of Traders report describes positions held at the close on Tuesday, 28 July. It therefore cannot yet see the foreign-exchange moves of 30 and 31 July. Its value lies elsewhere: it measures the quantity of short-yen bets already in place before the market was hit.

A snapshot taken before the move

The official CFTC row for the Chicago Mercantile Exchange yen future, contract code 097741, records 101,271 long contracts and 264,683 short contracts among non-commercial traders on 28 July. The difference is a net position of -163,412 contracts.

The figure was released on Friday, 31 July, but it remains dated Tuesday. The CFTC states that the COT is generally released on Friday using positions from the preceding Tuesday. Publishing a number after an event does not turn it into a post-event measurement.

That distinction is decisive this week. Reuters reported that the Japanese government intervened in the market on 30 July, according to market participants. The Ministry of Finance register, however, reports zero intervention between 29 June and 29 July and does not yet cover 30 July. The official total for the period from 30 July to 26 August is due on 28 August, according to the MoF calendar. Until then, the 30 July operation must remain attributed to Reuters and its market sources.

The institutional distinction matters too: the MoF decides Japanese foreign-exchange interventions and the BoJ executes them as its agent. The central bank explains this division in its own overview of intervention operations. It also kept its policy rate at 1.00% on 31 July in its latest monetary policy decision.

Net non-commercial short position in the yen future The net short position rises from 152,125 contracts on 21 July to 163,412 on 28 July, against a 184,223-contract extreme over the latest 170 weekly observations. // Yen: the short reloads before the shock net non-commercial position, CME futures, number of contracts 21 July 2026 -152,125 28 July 2026 -163,412 170-week extreme -184,223 The 28 July short equals 88.7% of the observed extreme. The -184,223-contract extreme dates from 2 July 2024. Source: CFTC, Legacy Futures Only, JPY contract 097741. l0g calculations.
Between 21 and 28 July, the net short position increased by 11,287 contracts. At the observation date, it stood at 88.7% of the largest short across the latest 170 observations. Source: CFTC.

Twelve billion dollars, but not twelve billion of global carry

Each standard contract represents 12.5 million yen. The ECB reference rates for 31 July give 184.03 yen and 1.1485 dollars per euro, producing a calculated USD/JPY rate of 160.235. Applied to the 163,412 net contracts, the conversion gives about $12.75 billion:

163,412 × ¥12,500,000 ÷ 160.235 = $12.75bn

The calculation is correct, but its perimeter must remain visible. This is the net notional of the relevant yen futures, not the size of the global yen carry trade. The series comes from the Legacy Futures Only report. It excludes, among other things, over-the-counter FX forwards and swaps, bank yen funding and foreign assets bought with that funding.

The trader label requires the same care. The Legacy report’s “non-commercial” category is not identical to hedge funds, CTAs or macro funds alone. The CFTC explains that categories are based on traders’ reported primary business purpose and that it does not know the specific reason for each position. In the more detailed Traders in Financial Futures report, Leveraged Funds were net short 101,990 contracts on 28 July. That is a narrower population than the Legacy report’s -163,412.

The rigorous description is therefore: the net position of non-commercial traders in CME yen futures. It reveals a market loaded against the yen, not the precise identity of every carry holder.

Price and positioning answer different questions

Looking only at USD/JPY shows the aggregate result of currency buying and selling. Spot reacts quickly and incorporates new information immediately. Its perimeter is far wider than one Chicago-listed contract: the BIS 2025 Triennial Survey covers spot, forwards, swaps and FX options, and places the yen on one side of 16.8% of global turnover. Price still does not reveal how many futures positions were already crowded on the same side.

The COT supplies that second piece of information, with a three-day lag and a perimeter limited to reported futures. It measures crowding, not the unwind in real time. The two indicators are complementary: price describes the move, while positioning describes part of the fuel that may amplify it. Our guide to reading the CFTC COT explains the categories and their limits.

Data calendar for observing positioning around the late-July shock The 28 July COT predates the 30 July move. The next observation will be on 4 August and released on 7 August. Japan's Ministry of Finance will publish the intervention total for the period on 28 August. // Timing determines what the chart can prove observation, market event, publication and official confirmation 28 July COT observed -163,412 30 July reported intervention not yet in the COT 31 July COT released the data date remains 28 July 4 then 7 Aug. observation then release first post-shock reading 28 August official MoF total period opened on 30 July Before 7 August, calling this a COT-visible unwind would be an extrapolation. Sources: CFTC, Ministry of Finance Japan. Release dates announced as of 2 August 2026.
The first COT that may capture reactions to the late-July moves will be observed on 4 August and normally released on 7 August. The official amount of Japanese intervention will not be known until 28 August.

The signal available today

The chart does not prove that the carry has already unwound. It establishes a more restrained and useful initial condition: the shock met a market almost as short yen as at the July 2024 peak. I infer greater potential sensitivity to forced covering, without claiming that such covering occurred.

The next question is falsifiable. If the 4 August COT shows a sharp reduction in the net short position, the result will be consistent with a futures unwind around the shock without proving its cause on its own. If the position remains near its current level, the yen move will have mostly reflected other channels or an adjustment still invisible in this report.

The Yen Carry Monitor tracks this series alongside the exchange rate and the policy-rate differential. It should be read according to its methodology: as a risk-monitoring tool, not a comprehensive measure of global carry. For transmission into other assets, see our analysis of dollar-yen and unwind risk and the Japanese bond channel.

Sources

  1. CFTC, Legacy Futures Only report for 28 July 2026, Japanese Yen CME contract 097741, and the reproducible 170-observation historical query.
  2. CFTC, Commitments of Traders overview and limits and 2026 release calendar, with the 7 August release scheduled.
  3. CFTC, Traders in Financial Futures, Futures Only, Leveraged Funds category on 28 July 2026.
  4. European Central Bank, 90-day reference exchange-rate feed, 31 July 2026.
  5. Ministry of Finance Japan, Foreign Exchange Intervention Operations, 29 June to 29 July 2026, zero total.
  6. Ministry of Finance Japan, intervention release calendar, next monthly release announced for 28 August 2026.
  7. Bank of Japan, MoF authority and the BoJ’s operational role.
  8. Bank of Japan, Statement on Monetary Policy, 31 July 2026.
  9. Bank for International Settlements, OTC foreign exchange turnover in April 2025, FX instrument perimeter and the yen’s share of global turnover.
  10. Reuters, Japan carries out yen-buying intervention as US executes rate check, 31 July 2026. The intervention is attributed to market participants pending the MoF’s official release.

Data cut off on 2 August 2026. Ratios and conversions explicitly identified as such are l0g calculations from official data. This is not investment advice.

This analysis is not investment advice.

// cite this analysis

l0g, “Yen: 163,412 net short contracts before the shock”, l0g.fr, published August 02, 2026, updated August 02, 2026, https://l0g.fr/en/analysis/yen-163412-net-short-contracts-before-shock/

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