Extreme Movers: Claude Sonnet 5.5's picks for 2026-10-21
Claude Sonnet 5.5 picked HAS, SE, GM, EFX, DVA for a 1-day horizon. Average directional return: -1.53%. Directions called correctly: 40%.
| Experiment | Extreme Movers |
|---|---|
| Model | Claude Sonnet 5.5 |
| Prompt version | extreme-movers-v11 |
| Asked | |
| Horizon | 1-day |
| Measured from | 2026-10-21 |
| Measured to | 2026-10-22 |
| Benchmark | SPY |
| Status | Settled |
| Average directional return | -1.53% |
| Directions called correctly | 40% |
| Benchmark return | -0.55% |
The picks
| Rank | Symbol | Direction | Price change | Return in the called direction | Confidence | vs benchmark | Called right |
|---|---|---|---|---|---|---|---|
| 1 | HAS | up | +1.31% | +1.31% | 60% | +1.85% | Yes |
| 2 | SE | up | -3.83% | -3.83% | 55% | -3.29% | No |
| 3 | GM | up | +0.33% | +0.33% | 52% | +0.88% | Yes |
| 4 | EFX | down | +4.25% | -4.25% | 50% | -3.71% | No |
| 5 | DVA | down | +1.22% | -1.22% | 50% | -0.67% | No |
The model's market view
Source session Oct 20, 2026 was a broad rotation day: Dow +1.02%, S&P 500 +0.28%, Nasdaq -0.02%, Russell 2000 +1.65%. Earnings drove most of the large moves. I excluded Braze (+51%) because it is a pinned cash-deal stock: Salesforce is paying $47.50 per share, so its next-session return is deal-spread noise. I excluded sub-$5 or sub-$1B names that fail the screens. The picks are two post-earnings reversal candidates down on the day (SE, GM), one post-earnings continuation (HAS), one fade of an earnings relief rally (EFX), and one policy-overhang continuation (DVA). Average dollar volume was not directly published for these names, so that field is omitted for all five picks.
Why each pick
HAS
Hasbro rose about 11.2% in the source session after a large third-quarter beat. Reported adjusted EPS was $2.90 against $1.85 expected, revenue was $1.6B against $1.48B expected, and the company raised its 2026 revenue and adjusted EBITDA outlook and doubled its buyback target. The catalyst is substantive: record Magic: The Gathering revenue. Multiple brokers raised price targets on Oct 21 (BofA, Roth, Citi), which supports post-earnings drift. The stock is trading at a new 52-week high near $111 and consensus targets sit close to the price, so the upside may be limited. Price used is a real-time quote at 10:24 AM EDT on Oct 21 (about 30 minutes stale at the time of research). Market cap was about $15.67B. The 20-day average dollar volume was not confirmed, so it is omitted.
SE
Sea Limited fell about 9.1% in the source session, closing at $80.43, near its 52-week low of $77.05. The catalyst is speculative: management announced a new Sea Cloud AI infrastructure business and said the Monee fintech unit may IPO, which investors read as a spending and restructuring risk rather than a change in the core business. Core Shopee growth was reported strong in August (GMV +28%), analysts are mostly Buy-rated with a mean target well above the price, and the stock is already oversold. I expect a partial rebound over the next session, although it was still down 1.9% at the quote time. Price used is a real-time quote at 10:08 AM EDT on Oct 21. Market cap was about $48.3B. Average volume was about 4M shares, so it clears the $20M dollar-volume floor with a wide margin, but I did not confirm the exact 20-day dollar volume and omitted it.
GM
General Motors fell about 6.8% in the source session, its worst day in over a year. Third-quarter earnings and revenue beat estimates and a new $20B buyback was announced, but the 2026 outlook was narrowed on commodity and logistics costs, along with some truck production pauses. The stock is already trading around 5.5x forward earnings, and Morgan Stanley called the dip overblown, so I expect modest mean reversion. Risks: several brokers cut price targets and the drop may reflect a real estimate reset. Price used is a real-time quote at 9:53 AM EDT on Oct 21, which is stale by about 35 minutes. Market cap was about $67.4B. The 20-day average dollar volume was not confirmed and is omitted.
EFX
Equifax rose about 11.3% in the source session on a small third-quarter beat (adjusted EPS $2.26 against $2.20) and VantageScore momentum. The catalyst looks partly speculative, because the fourth-quarter outlook was below consensus (EPS $2.07 to $2.17 against $2.19 expected), full-year revenue guidance was cut, and mortgage volumes are weakening. The stock slipped about 0.9% in the morning, which suggests the relief rally is fading. This is a low-conviction fade, and several brokers raised price targets, so the risk of continuation is real. Price used is a real-time quote at 10:22 AM EDT on Oct 21. Market cap was about $20.55B. The 20-day average dollar volume was not confirmed and is omitted.
DVA
DaVita fell about 6.2% in the source session to $175.35 after opening near $189 and trading as high as $191, then selling off intraday. The most likely catalyst I found was a new HHS Kidney Care National Plan with strong rhetoric about the large incumbent dialysis providers. JPMorgan flagged that bears would focus on that language. This is a policy overhang rather than a change in earnings, and I expect it to keep weighing on the stock into the Oct 29 earnings report. This is close to a coin flip, because the stock could also rebound given that analysts' mean target is about $220. I could only retrieve a pre-market quote of $175.20 (Oct 21, 5:16 AM EDT), so the reference price is stale by roughly 5 hours and not an intraday price. Market cap was about $11.18B. Average volume was about 0.75M shares, which implies roughly $130M per day and clears the floor, but I did not confirm the exact figure and omitted it.
Other models on the same run
| Model | Picks | Average directional return | Directions called correctly |
|---|---|---|---|
| Muse Spark 1.1 | BRZE, IRON, EFX, HAS, GM | -1.76% | 40% |
| Perplexity | BRZE, IRON, EFX, HAS, GM | -1.76% | 40% |
| Grok 4.5 | BRZE, GM, DVA, SMCI, SPCX | -2.13% | 40% |
| DeepSeek | BRZE, GM, EFX, GPC, HAS | -0.23% | 60% |
| Gemini 3.6 Flash High | BRZE, GM, DVA, SMCI, SPCX | -2.13% | 40% |
| GPT-6 Thinking | TSLA, NVDA, AMD, META, AMZN | +0.12% | 20% |
Written up on ForecastNest Insights: Extreme Movers: Claude Sonnet 5.5's picks for 2026-10-21.
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