CookieStocks
AMT +8.2%: one of its biggest daily moves this year. AMERICAN TOWER CORP /MA/ moved 6.7 points more than its sector, on 1.5× its usual volume.

2026-10-09 · AMT

AMT +8.2%: one of its biggest daily moves this year

AMERICAN TOWER CORP /MA/ moved 6.7 points more than its sector, on 1.5× its usual volume.

The story in plain words

Friday, October 9, 2026. AMT +8.2%: one of its biggest daily moves this year. AMERICAN TOWER CORP /MA/ moved 6.7 points more than its sector, on 1.5× its usual volume.

What the data shows for American Tower (AMT): AMT +8.2% today. Its sector fund (XLRE) +1.4% today. S&P 500 (SPY) +0.5% today.

Worked out from that data: 6.7 points more than its sector. Volume 1.5× its 20-day average. Its biggest daily move in the past 250 trading days. After the 5 most similar AMT days since Oct 21, 2021, the stock was higher 5 days later 3 of 5 times (History, not a forecast).

Possible contributors. These line up in time with the move; they are not confirmed causes: News: “Crown Castle Soars 13% as SpaceX’s $8 Billion Spectrum Buy Keeps Tower Build Option “Very Much Alive”” (Published around the move. Timing only, not a confirmed cause). News: “These Stocks Are the Hidden Winners of SpaceX’s Spectrum Binge” (Published around the move. Timing only, not a confirmed cause).

About the company: American Tower trades as AMT and is part of the S&P 500, in the Real Estate sector (Telecom Tower REITs), headquartered in Boston, Massachusetts, founded in 1995.

This is one of CookieStocks’ daily stock stories about unusually large one-day price moves in S&P 500 stocks, measured against each stock’s own history, its sector and its usual volume. Stories are found automatically each trading day from market data and SEC filings, and every claim is labelled as observed, calculated or a possible contributor. Statistics only, not investment advice.

Prove it

Every claim on the graphic, labelled: observed (straight from the data), calculated (worked out from it), or possible contributor (lines up in time, not a confirmed cause).

  • OBSERVED
    AMT +8.2% todayOct 9, 2026, 12:35 PM ET
  • OBSERVED
    Its sector fund (XLRE) +1.4% todayOct 9, 2026, 12:35 PM ET
  • CALCULATED
    6.7 points more than its sectorHow: stock return − sector fund return · Oct 9, 2026, 12:35 PM ET
  • OBSERVED
    S&P 500 (SPY) +0.5% todayOct 9, 2026, 12:35 PM ET
  • CALCULATED
    Volume 1.5× its 20-day averageHow: today’s volume ÷ average of the last 20 days · Oct 9, 2026, 12:35 PM ET
  • CALCULATED
    Its biggest daily move in the past 250 trading daysHow: share of past daily moves smaller in size · Oct 9, 2026, 12:35 PM ET
  • POSSIBLE CONTRIBUTOR
    News: “Crown Castle Soars 13% as SpaceX’s $8 Billion Spectrum Buy Keeps Tower Build Option “Very Much Alive””Published around the move. Timing only, not a confirmed cause. · Oct 9, 2026, 11:34 AM ET
  • POSSIBLE CONTRIBUTOR
    News: “These Stocks Are the Hidden Winners of SpaceX’s Spectrum Binge”Published around the move. Timing only, not a confirmed cause. · Oct 9, 2026, 10:43 AM ET
  • CALCULATED
    After the 5 most similar AMT days since Oct 21, 2021, the stock was higher 5 days later 3 of 5 timesHistory, not a forecast. · How: same-company days with a move of similar size and direction

American Tower (AMT) financials and filings →

More stories

Statistics only, not investment advice. Past moves don’t predict future ones. Data as of Oct 9, 2026, 12:35 PM ET.