Stock Selection: Claude Sonnet 5.5's picks for 2026-11-03
Claude Sonnet 5.5 picked OKTA, IDXX, FN, TEM, AMD for a 1-day horizon. Portfolio return vs SPY: -3.70%. Picks that beat SPY: 20%.
| Experiment | Stock Selection |
|---|---|
| Model | Claude Sonnet 5.5 |
| Prompt version | stock-selection-v8 |
| Asked | |
| Horizon | 1-day |
| Measured from | 2026-11-03 |
| Measured to | 2026-11-04 |
| Benchmark | SPY |
| Status | Settled |
| Portfolio return vs SPY | -3.70% |
| Picks that beat SPY | 20% |
| Benchmark return | +1.19% |
The picks
| Rank | Symbol | Return | Confidence | vs benchmark | Called right |
|---|---|---|---|---|---|
| 1 | OKTA | -1.00% | 58% | -2.19% | No |
| 2 | IDXX | +3.56% | 53% | +2.37% | Yes |
| 3 | FN | -7.68% | 50% | -8.87% | No |
| 4 | TEM | -6.15% | 47% | -7.34% | No |
| 5 | AMD | -1.26% | 45% | -2.45% | No |
The model's market view
Tech and AI hardware sold off hard on Monday (Nasdaq Composite -1.07%, S&P 500 -0.51%, Dow +0.41%) and are rebounding partially today. The window runs through tonight's AMD, Arista and Super Micro earnings, Datadog before the open on Nov 4, and the US midterm results overnight, with VIX above 21, so dispersion will be high. I favor one mechanical flow (Okta's S&P 500 inclusion, with index buying expected at today's close), two names that gapped up on clean fundamental beats (IDEXX, Fabrinet), one raised-guidance mover (Tempus), and AMD as an oversold name into a print whose bar was reset lower. All five are long, so the edge versus SPY is modest and confidences are low to moderate.
Why each pick
OKTA
Thesis: S&P 500 inclusion flow. S&P Dow Jones Indices announced on Oct 30 that Okta replaces Kenvue in the S&P 500 effective prior to the open on Wednesday Nov 4 (S&P press release), so S&P 500 index funds are expected to buy at today's close, which falls inside this window (that timing is my inference of standard practice). The stock fell 11.22% on Monday to 184.87 amid a cybersecurity sell-off (Check Point, Fortinet and Zscaler also fell; attributing Okta's drop to sympathy selling is my inference), so it enters the flow event below its Oct 30 close of 208.24. Quote: latest_price 187.18 at 2026-11-03T11:26:02-05:00, live regular-session real-time via Yahoo (+1.25% vs Monday close). Market cap 32.87B (Yahoo, intraday, earlier today); 20-day average dollar volume about 709.6M (my computation). Risks: the stock fell 11% on Monday even after the announcement, S&P MidCap 400 funds must sell, software and cyber sentiment is weak, and the effect can fade after the effective date (the window ends about 1 hour after the Nov 4 open). Invalidation: a trade below Monday's low of 183.12.
IDXX
Thesis: post-earnings drift after a beat-and-raise. IDEXX reported Q3 before the open on Nov 2: revenue up 10% to 1.21 billion dollars and a raised 2026 revenue and EPS outlook (StockTitan; Cappnotes gives the new EPS range as 14.96 to 15.16), with multiple analyst target increases. The stock rose 21.85% on Monday to 671.64 on about 3.1x its average volume, closing near the day high. Quote: latest_price 675.10 at 2026-11-03T11:26:24-05:00, live regular-session real-time via Yahoo (+0.51% vs Monday close, so it is holding the gap and edging higher). Market cap 52.631B (Yahoo, intraday, earlier today); 20-day average dollar volume about 355.5M (my computation). Risks: a one-day gain of about 22% leaves valuation stretched, drift is a small effect versus a market-wide move, and any reversal below the gap would be sharp. Invalidation: a move back below Monday's open of 625.00 (gap fill).
FN
Thesis: continuation after a record quarter in a stock that had de-rated heavily. Fabrinet reported record fiscal Q1 2027 revenue up 51% year over year, above its guidance range, with non-GAAP EPS well above guidance, and management said it enters Q2 with exceptional momentum (SEC Form 8-K exhibit dated Nov 2). Before the print the stock closed Monday at 314.70, roughly 47% below its Aug 17 close of 598.58, so the beat resets sentiment from a depressed base (my inference). Quote: latest_price 356.83 at 2026-11-03T11:26:26-05:00, live regular-session real-time via Yahoo (+13.4% today, slightly off its morning high of 367.99). Market cap 13.051B (Yahoo, intraday, earlier today); 20-day average dollar volume about 396.2M (my computation). Risks: the gap is large and already partly faded from the high, AI-hardware sentiment is fragile ahead of AMD and Arista results tonight, and the stock has repeatedly given back rallies in October. Invalidation: a fall back below today's open of 329.99.
TEM
Thesis: continuation of a fundamentals-driven move. Tempus reported third-quarter revenue up 23% to 411.5 million dollars and raised its 2026 revenue forecast (StockTitan citing the Tempus release); the stock rose 8.67% on Monday to 78.48 on 17.0M shares versus a 20-day average of about 6.9M. Quote: latest_price 79.33 at 2026-11-03T11:26:08-05:00, live regular-session real-time via Yahoo (+1.08% vs Monday close; it has faded from an earlier 80.95 and a morning high of 84.47). Market cap 14.765B (Yahoo, intraday, earlier today); 20-day average dollar volume about 491.4M (my computation). Risks: the stock is up about 17% over five sessions, remains unprofitable on a non-GAAP basis, has issued convertible notes in June and July, and the intraday fade from 84.47 shows supply. Invalidation: a trade back below Monday's open of 74.43.
AMD
Thesis: oversold large cap into a scheduled print with a reset bar. AMD reports fiscal Q3 after the close on Nov 3 (call around 4:15 pm ET; officially scheduled, not yet occurred); consensus is about 1.96 EPS and 13.20 billion dollars revenue (Tickzen), and the options-implied move was about 8.3% as of Nov 2 (earnings-watcher). The stock fell about 10.9% on Oct 30 (after Intel's weak Q4 guide) and 7.5% on Monday to 466.84, so expectations were cut sharply; one desk note says a solid outlook may be enough to stabilize it, and mentions an Anthropic supply commitment (not independently verified). Quote: latest_price 490.03 at 2026-11-03T11:27:00-05:00, live regular-session real-time via Yahoo (+4.97% vs Monday close), so part of the rebound is already in. Market cap about 797.6B (Yahoo, intraday, earlier today); 20-day average dollar volume about 11.9B (my computation). Risks: this is a coin-flip earnings reaction with large variance, Intel's collapse shows soft guides are punished, and the market is exposed to the AI-capex debate. Invalidation: a post-report move below Monday's low of 466.07.
Other models on the same run
| Model | Picks | Portfolio return vs SPY | Picks that beat SPY |
|---|---|---|---|
| Claude Opus 5.5 | FISV, IDXX, HWM, RVTY, FN | -3.75% | 40% |
| GPT-6 | FN, HWM, NXT, AMD, IDXX | -1.50% | 40% |
| GPT-6.1 Sol | IDXX, REGN, FN, HWM, NXT | -1.52% | 40% |
| Muse Spark 1.1 | AMD, IDXX, SHOP, SUPN, LITE | -3.31% | 40% |
| Perplexity | IDXX, HWM, RIVN, PNR, SHW | +0.66% | 80% |
| Gemini 3 Pro | AEHR, FN, NBIX, RVTY, LSCC | -7.06% | 0% |
| Grok 4.7 | IDXX, LSCC, NBIX, FN, RVTY | -4.97% | 20% |
| DeepSeek | UPWK, TEVA, AEHR, HLIT, ON | -4.82% | 0% |
Written up on ForecastNest Insights: Stock Selection: Claude Sonnet 5.5's picks for 2026-11-03.
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