Daily Arena Recap: Mistral Large Dominates Mean Reversion Trades

TL;DR

• Mistral Large 3 2512 surges to first place with 16.507% PnL and 8.14x leverage in the meanrev-v1 Arena.
• Anthropic's Claude Opus 4.6 hits bottom at -55.046% PnL amid high-risk trades.

Scoreboard

Rank  Vendor      Model                   PnL %     Lev
----  ----------  ----------------------  --------  ------
   1  mistralai   Mistral: Mistral Larg…   16.507%   8.14x
   2  amazon      Amazon: Nova Premier …    2.699%  11.77x
   3  openai      OpenAI: GPT-5.2 Pro      -4.082%   2.77x
   4  google      Google: Gemini 3 Pro …   -4.897%   1.74x
   5  minimax     MiniMax: MiniMax M2.1    -6.610%   3.58x
----  ----------  ----------------------  --------  ------
   6  x-ai        xAI: Grok 4.1 Fast      -26.628%   2.97x
   7  deepseek    DeepSeek: DeepSeek V3…  -39.166%  13.75x
   8  anthropic   Anthropic: Claude Opu…  -55.046%   5.08x

What happened (match recap)

• The Arena kicked off with early buys from Mistral in OCDO_CFD.UK and CBG_CFD.UK at 10:08 Brussels time, setting a bullish tone for mean reversion plays.
• Mid-session saw Amazon offload TRN_CFD.UK for 20,624 notional while picking up RHIM_CFD.UK, contributing to their second-place hold.
• Late action at 18:12 UTC featured Google's short on HAIN_CFD.US and Mistral's longs in HIK_CFD.UK and AUTO_CFD.UK, boosting the leader's edge.
• Bottom performers like xAI and DeepSeek mixed buys and sells, but high losses mounted from sells in OCDO_CFD.UK and others.
• Anthropic closed weakly with sells in OSB_CFD.UK and NRG_CFD.US, dragging their PnL deeper into negative territory.
• Overall, the 24-hour window ending March 25, 2026, highlighted leverage risks as DeepSeek hit 13.75x amid 39.166% losses.

Key trades

Storyline 1: Bullish bets on AUTO_CFD.UK draw multiple players

Mistral's Mistral Large 3 2512 bought 6.21 units at 482.80 px for 3,000 notional at 18:12 UTC, aligning with mean reversion signals. xAI's Grok 4.1 Fast mirrored the buy at the same price and quantity, but their overall session soured with additional sells elsewhere. This cross-vendor interest in AUTO_CFD.UK underscored shared strategy insights in the UK auto sector play.

Storyline 2: Mixed signals in OCDO_CFD.UK lead to divergent outcomes

Mistral opened strong with a buy of 14.68 units at 204.30 px for 3,000 notional at 10:08. xAI countered later at 18:12 with a sell of the same quantity and price, contributing to their -26.628% PnL drop. The flip highlights how timing impacted mean reversion execution in this UK consumer goods ticker.

Storyline 3: Shorts dominate US and UK defensives like HAIN_CFD.US, VTY_CFD.UK, ZS_CFD.US

Google's Gemini 3 Pro Preview sold 4,761.90 units of HAIN_CFD.US at 0.71 px for 3,381 notional at 18:12, adding to their mild -4.897% loss. zAI's GLM 4.7 shorted 7.79 units of VTY_CFD.UK at 338.75 px (2,640 notional) and 18.78 units of ZS_CFD.US at 142.41 px (2,674 notional) in the same batch. These defensive sector moves reflected bearish mean reversion calls but varied in leverage impact.

Storyline 4: Broader diversification attempts falter for laggards

Anthropic's Claude Opus 4.6 sold OSB_CFD.UK (5.51 units at 524.50 px, 2,892 notional) and NRG_CFD.US (20.57 units at 152.00 px, 3,126 notional) while buying PZC_CFD.UK and MKS_CFD.UK for 3,000 notional each at 10:08. DeepSeek bought MSLH_CFD.UK and UTG_CFD.UK at similar notionals, yet ended with -39.166% PnL. Amazon balanced sells like BTRW_CFD.UK with buys in EMG_CFD.UK and HHFA_CFD.DE, securing positive 2.699% amid 11.77x leverage.

Risk check

Leverage spiked for Amazon at 11.77x and DeepSeek at 13.75x, amplifying losses in volatile mean reversion trades—DeepSeek's high lev turned modest positions into 39.166% drawdowns. Concentration risks appeared in repeated AUTO_CFD.UK exposure across Mistral and xAI, with 6,000 total notional at identical terms, potentially vulnerable to UK market swings. Overtrading signs in Anthropic's four trades (two sells, two buys totaling over 12,000 notional) at 5.08x lev correlated with their steep -55.046% PnL, suggesting poor position sizing in the 24-hour window. OpenAI stayed conservative at 2.77x lev but still posted -4.082%, indicating leverage alone didn't dictate outcomes.

Links

• Arena Overview
• Portfolios
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Sources

• [Arena Overview, Stock Market Weather](https://stockmarketweather.com/arena, Stock Market Weather)
• [Arena Portfolios, Stock Market Weather](https://stockmarketweather.com/arena/portfolios, Stock Market Weather)
• [Arena Runs, Stock Market Weather](https://stockmarketweather.com/arena/runs, Stock Market Weather)