Why It Moved · Market · 2026-10-26
Why it moved, October 26: Fair Isaac -13%, Lumentum +8%, Comfort Systems USA +7%
On Monday, October 26 the S&P 500 rose 0.7% and 294 of 503 member stocks finished higher. AI-infrastructure stocks rose a median 2.5%. Last year's 50 best performers rose a median 1.8%. These were the five biggest moves among S&P 500 stocks, and what was behind each.
Investigations
The question
Revenue grew 54% from a year earlier and the company made money, yet the stock fell 17% around its results. What do the filings show that the headline didn't?
What the filings show
- Insiders sold, none bought. Executives and directors sold about $43.2 million of stock in the 90 days to Oct 26, the largest seller $25.8 million. Sales are often planned or for taxes; purchases are rarer.
- The timing. Results came out after the close on Oct 22. The stock moved -8.7% that day, before they were public (S&P 500 ETF -1.2%), and -9.3% the next day (S&P 500 ETF -0.5%).
What to watch
- The next quarterly report (the quarter ending in December, filing due around February 2027): whether the outlook holds.
Sources: earnings release (8-K, 2026-10-22) · 10-Q (2026-10-22)
The question
The company reported a profit, but its operations used cash. Where did the money go?
What the filings show
- Profit did not turn into cash. It earned $74.1 million in the quarter ended August 2, but its operations used $136.3 million of cash, after bringing in $180.2 million the quarter before. After $101.3 million of capital spending, free cash flow was about -$237.6 million.
- Receivables grew faster than sales. Receivables rose 94% from a year earlier to $1.0 billion ($140.9 million in the latest quarter alone), against revenue growth of 38%.
- Insiders sold, none bought. Executives and directors sold about $216.3 million of stock in the 90 days to Oct 26, the largest seller $171.7 million. Sales are often planned or for taxes; purchases are rarer.
- Outlook raised. The company's own revenue outlook for the full year moved to $1.0 billion-$1.0 billion, from $985 million-$1.0 billion in its previous release.
What to watch
- The next quarterly report (the quarter ending in November, filing due around December 2026): whether operating cash flow turns positive and unbilled revenue starts converting to cash.
Sources: earnings release (8-K, 2026-08-26) · 10-Q (2026-09-04)
The question
The share count is growing fast. Who is paying for the growth?
What the filings show
- Profit did not turn into cash. It earned $240.5 million in the quarter ended June 30, but its operations brought in only $69.5 million, after using $93.8 million the quarter before. After $555.7 million of capital spending (1.9 times the prior quarter's), free cash flow was about -$486.2 million.
- Inventory grew faster than sales. Inventory rose 80% from a year earlier to $2.6 billion ($454.2 million in the latest quarter alone), against revenue growth of 34%.
- More shares. The latest 10-Q/10-K cover page counts 195.8 million shares, up 26% from 155.8 million a year earlier - each share owns a smaller slice of the company.
- Insiders sold, none bought. Executives and directors sold about $8.2 million of stock in the 90 days to Oct 26, the largest seller $3.6 million. Sales are often planned or for taxes; purchases are rarer.
- Outlook raised. The company's own revenue outlook for the coming quarter moved to $2.2 billion-$2.4 billion, from $1.7 billion-$1.8 billion in its previous release.
What to watch
- The next quarterly report (the quarter ending in September, filing due around November 2026): whether operating cash flow turns positive and unbilled revenue starts converting to cash.
Sources: earnings release (8-K, 2026-08-12) · 10-K (2026-08-14)
The biggest S&P 500 moves, October 26
"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
- Fair Isaac (FICO) fell 13.3% after an analyst downgrade1. That is about 5 times its usual daily move. Its software peers barely moved (median -0.2%), so this was about the company, not its industry.
- Lumentum (LITE) rose 8.2% after a product launch2. It was not alone: the other 5 networking stocks in the S&P 500 rose a median 2.8%, all 5 higher (biggest: Ciena +4.9%, Cisco +3.5%, Arista Networks +2.8%). It is one of the past year's 50 best S&P 500 performers (+122.0% this year), a group that rallied today as investors piled back in.
- Comfort Systems USA (FIX) rose 7.1%. That is about 3 times its usual daily move. It was not alone: the other 3 construction & engineering stocks in the S&P 500 rose a median 2.8%, all 3 higher (biggest: Quanta Services +3.2%, Emcor +2.8%, Jacobs Solutions +1.4%).
- Everpure (P) rose 6.5%. That is about 2 times its usual daily move. It was not alone: the other 9 computer hardware stocks in the S&P 500 rose a median 2.2%, 7 of the 9 higher (biggest: Hewlett Packard Enterprise +3.6%, NetApp +3.1%, Western Digital +2.9%).
- Coherent (COHR) rose 6.3%. It was not alone: the other 2 electronic component stocks in the S&P 500 rose a median 2.5%, both higher (biggest: Corning +3.4%, Amphenol +1.6%). It is one of the past year's 50 best S&P 500 performers (+20.6% this year), part of the same rally.
- 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
- Investing.com, Oct 26, 2026: Wells Fargo downgrades Fair Isaac stock rating on pricing strategy
- Yahoo Finance, Oct 26, 2026: Lumentum and Coherent Stocks Jump 3% as StoneX Unveils Bold Price Targets
Did the model see it coming?Subscribers see the model's view on every S&P 500 stock before and after big moves.
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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
- Insider & Short-Selling Daily, October 29 2026-10-29
- Market brief, October 29: S&P 500 falls 0.4% as internet stocks slide 2026-10-29
- Why it moved, October 29: ServiceNow -27%, Fortinet -20%, Gen Digital +16% 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
- Why it moved, October 27: Xylem -14%, Pentair +13%, Boeing -11% 2026-10-27
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