US regular session 9:30 AM–4:00 PM ET·Stories: Fri 16 Oct 2026·Stock prices: as of 4:00 PM ET Thu 15 Oct (Finnhub)·Data updated 8:02 AM ET·New York --:-- · Your time --:--
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Movers

Monday's biggest movers: United Microelectronics Corporation (NEW) sinks 8.9% and PTC jumps 33.5%

The largest moves among $20B+ companies, with the context the numbers give: how unusual each move was and any filing or earnings report behind it.

The short version

  • Top decliner: UMC -8.9%.
  • Top gainer: PTC +33.5%.
Get the daily filings briefMovers, SEC filings and earnings before the open. Free.

Among US-listed companies worth at least $20 billion, the biggest moves in Monday's session (5 October) came from United Microelectronics Corporation (NEW), which fell 8.9%, and PTC, which rose 33.5%.

UMCUnited Microelectronics Corporation (NEW)-8.9%
INSMInsmed-6.6%
CMGChipotle Mexican Grill-4.7%
NBISNebius-4.2%
BMYBristol-Myers Squibb-3.8%
Biggest decliners, $20B+ companies, 5 Oct 2026 Source: Nasdaq; Yahoo Finance

The decliners

United Microelectronics Corporation (NEW) (UMC) fell 8.9% to $23.92. It was its biggest one-day drop since 28 July, based on the past year of closes. The shares are up 204% this year and 14.6% below their 52-week closing high. Coverage since the move includes MT Newswires's headline “United Microelectronics Posts 27% Growth in September Sales”.

Insmed (INSM) fell 6.6% to $103.83. It was its biggest one-day drop since 10 June, based on the past year of closes. The shares are down 40.3% this year and 50.9% below their 52-week closing high. Coverage since the move includes Investing.com's headline “Insmed stock falls as CFO Sara Bonstein to step down”.

Chipotle Mexican Grill (CMG) fell 4.7% to $30.85. It was its biggest one-day drop since 15 September, based on the past year of closes. The shares are down 16.6% this year and 27.2% below their 52-week closing high. Coverage since the move includes 24/7 Wall St.'s headline “Chipotle Sinks 4% as Selling Outruns the Restaurant Group; McDonald’s and Starbucks Dip”.

Nebius (NBIS) fell 4.2% to $232.57. It was its biggest one-day drop since 14 September, based on the past year of closes. The shares are up 178% this year and 18.9% below their 52-week closing high.

PTCPTC+33.5%
BBDOBanco Bradesco Sa+19.0%
BBDBanco Bradesco Sa+18.6%
SBSCompanhia de saneamento Basico Do Estado De Sao Paulo - Sabesp+16.4%
ITUBItaú Unibanco S.A.+15.5%
Biggest gainers, $20B+ companies, 5 Oct 2026 Source: Nasdaq; Yahoo Finance

The gainers

PTC (PTC) rose 33.5% to $192.26. It was its biggest one-day gain in the past year, based on the past year of closes. The shares are up 10.4% this year and 6.6% below their 52-week closing high. Coverage since the move includes 24/7 Wall St.'s headline “Here Are Tuesday’s Top Wall Street Analyst Research Calls: Borg Warner, Boyd Gaming, JetBlue, Lattice Semiconductor, Lockheed Martin, Nike, Northrop Grumman, Procter & Gamble, SPX Technologies, and More”.

Banco Bradesco Sa (BBDO) rose 19.0% to $3.76. It was its biggest one-day gain in the past year, based on the past year of closes. The shares are up 31.0% this year and 0.3% below their 52-week closing high.

Banco Bradesco Sa (BBD) rose 18.6% to $4.33. It was its biggest one-day gain in the past year, based on the past year of closes. The shares are up 30.0% this year and at their 52-week closing high.

Companhia de saneamento Basico Do Estado De Sao Paulo - Sabesp (SBS) rose 16.4% to $6.26. It was its biggest one-day gain in the past year, based on the past year of closes. The shares are up 31.2% this year and 11.6% below their 52-week closing high.

The megacaps

Of the 12 most-watched names we track, 7 closed higher. Tesla (TSLA) did best at +2.20%, and Supermicro (SMCI) worst at -1.14%.

Figures: Nasdaq (prices and market values for $20B+ companies), Yahoo Finance (past-year closes), SEC EDGAR, Nasdaq earnings calendar. Closing prices.

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