Why It Moved · Market · 2026-10-27
Why it moved, October 27: Xylem -14%, Pentair +13%, Boeing -11%
On Tuesday, October 27 the S&P 500 rose 0.6% and 240 of 503 member stocks finished higher. AI-infrastructure stocks rose a median 4.2%. Last year's 50 best performers rose a median 1.9%. These were the five biggest moves among S&P 500 stocks, and what was behind each.
Investigations
The question
Sales are growing, but the money owed to the company is growing faster. Is revenue turning into cash?
What the filings show
- Contract assets (revenue booked before it can be billed) grew faster than sales. Contract assets rose 85% from a year earlier to $1.4 billion ($323 million in the latest quarter alone), against revenue growth of 21%.
- Outlook raised. The company's own revenue outlook for the coming quarter moved to $6.6 billion-$7.0 billion, from $6.3 billion-$6.7 billion in its previous release.
What to watch
- The next quarterly report (the quarter ending in September, filing due around November 2026): whether receivables and contract assets grow more slowly than sales.
Sources: earnings release (8-K, 2026-07-29) · 10-Q (2026-07-31)
The biggest S&P 500 moves, October 27
| Company | Move | vs usual day | Year to date | Where it stands |
|---|
| Xylem (XYL) | -14.2% | 12.1x | -31.1% | at a 52-week low · below 200-day |
| Pentair (PNR) | +12.8% | 9.4x | -39.6% | -42% from high · below 200-day |
| Boeing (BA) | -10.9% | 6.9x | -22.7% | at a 52-week low · below 200-day |
| Valero Energy (VLO) | -9.2% | 5.1x | +141.7% | -16% from high · above 200-day |
| Flex Ltd. (FLEX) | +8.5% | 2.8x | +38.2% | -48% from high · below 200-day |
"vs usual day" compares the move with the stock's average daily move (up or down) over the past year. "Where it stands" is the distance from the 52-week high and the position against the 200-day average. Stocks with a one-day change over 60% today (usually a spin-off or split) are left out; where a stock had such a jump earlier in the year, its longer-run columns show –.
What this means
- Xylem (XYL) fell 14.2% as Barron's reported “Xylem Stock Plunges as Customers Pull Back. Its Outlook Just Got Worse”1. That is about 12 times its usual daily move. Its industrial machinery & supplies & components peers barely moved (median -0.0%), so this was about the company, not its industry. It reported quarterly results.
- Pentair (PNR) rose 12.8%. That is about 9 times its usual daily move. Its industrial machinery & supplies & components peers barely moved (median -0.1%), so this was about the company, not its industry. It reported quarterly results.
- Boeing (BA) fell 10.9% after an analyst cut its price target2, despite an analyst upgrade3. That is about 7 times its usual daily move. Its aerospace and defense peers barely moved (median -0.4%), so this was about the company, not its industry. It reported quarterly results; options had priced a move of about ±3%.
- Valero Energy (VLO) fell 9.2%. That is about 5 times its usual daily move. It was not alone: the other 2 oil & gas refining & marketing stocks in the S&P 500 fell a median 7.2%, both lower (biggest: Marathon Petroleum -7.4%, Phillips 66 -7.1%).
- Flex Ltd. (FLEX) rose 8.5%. That is about 3 times its usual daily move. It was not alone: the other 2 electronic manufacturing services stocks in the S&P 500 rose a median 4.1%, both higher (biggest: TE Connectivity +5.4%, Jabil +2.8%). It reported quarterly results.
- A big one-day move tells you what the market learned that day, not where the stock goes next: large moves partly reverse about as often as they continue.
Sources
- Barron's, Oct 27, 2026: Xylem Stock Plunges as Customers Pull Back. Its Outlook Just Got Worse
- Bloomberg, Oct 27, 2026: Bloomberg Intelligence: Boeing Cuts Delivery Target (Podcast)
- Investing.com, Oct 27, 2026: Langenberg upgrades Boeing stock rating on backlog strength
Did the model see it coming?Subscribers see the model's view on every S&P 500 stock before and after big moves.
See plans
Prices from Torvanta's end-of-day data; filings from SEC EDGAR. News context is drawn from the coverage cited below and may not be the whole cause of a move. Research only, not investment advice or a recommendation to buy or sell any security. Rankings change as data changes and can be wrong. Torvanta and its founder may hold positions in securities discussed, and trade only after the information is published to all subscribers. Past performance does not guarantee future results.
More research
- Market brief, Thursday October 29: futures little changed 2026-10-29
- Fair Value Check: Berkshire Hathaway is overvalued on our numbers 2026-10-29
- The Giants Monitor: the top 10 are 42.0% of the S&P 500 (week of October 26) 2026-10-29
- Insider & Short-Selling Daily, October 28 2026-10-28
- Market brief, October 28: S&P 500 rises 0.1% as software stocks slide 2026-10-28
- Why it moved, October 28: Fortinet -27%, F5 -20%, ServiceNow -19% 2026-10-28
- Midweek Movers: where the model's view shifted this week 2026-10-28
- Insider & Short-Selling Daily, October 27 2026-10-27
- Market brief, October 27: S&P 500 rises 0.6% as chip stocks rally 2026-10-27
- Dividend Watch, October 27: Vici Properties leads covered yields 2026-10-27
- Insider & Short-Selling Daily, October 26 2026-10-26
- Market brief, October 26: S&P 500 rises 0.7% as chip stocks rally 2026-10-26
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