Wondering what's happening in today's S&P500 pre-market session?

By Mill Chart - Last update: Oct 20, 2025

Get insights into the top gainers and losers in the S&P500 index of Monday's pre-market session.


premarket

Gainers

TickerChangeComment
COO6.43%COOPER COS INC/THE (NASDAQ:COO) experienced an impressive 6.43% increase in share price, reaching $76.6 during the pre-market session on Monday. Shareholders saw the stock price going 33.52% lower is the past year.
HOLX5.41%Exciting news for HOLOGIC INC (NASDAQ:HOLX) as their shares soared 5.41% to $73.63 during the pre-market session on Monday. Shareholders saw the stock price going 21.35% higher is the past 6 months.
MU4.3%During Monday's pre-market session, MICRON TECHNOLOGY INC (NASDAQ:MU) experienced a 4.3% increase, with the stock price reaching $211.09. Shareholders saw the stock price going 24.37% higher in the past month.
SMCI3.97%The pre-market session on Monday saw a significant rise in SUPER MICRO COMPUTER INC's (NASDAQ:SMCI) shares, climbing 3.97% to $54.25. The stock is trading 65.62% higher than 6 months ago.
HOOD3.07%Investors witnessed a remarkable surge in ROBINHOOD MARKETS INC - A (NASDAQ:HOOD) during Monday's pre-market session, with the stock price rising 3.07% to $133.9. In the last 6 months the stock gained 215.0%.
STLD2.76%STEEL DYNAMICS INC (NASDAQ:STLD) recorded a 2.76% increase in share price during the pre-market session, reaching $146.69 on Monday. The company's earnings where released Yesterday. In the last 6 months the stock gained 20.68%.
COIN2.63%COINBASE GLOBAL INC -CLASS A (NASDAQ:COIN) experienced an impressive 2.63% increase in share price, reaching $344.85 during the pre-market session on Monday. The stock is trading 91.98% higher than 6 months ago.
IFF2.41%INTL FLAVORS & FRAGRANCES's (NYSE:IFF) shares surged 2.41% to reach $65.29 during the pre-market session on Monday. The stock is trading 39.0% lower than a year ago.
STX2.24%During Monday's pre-market trading, SEAGATE TECHNOLOGY HOLDINGS (NASDAQ:STX) demonstrated strong momentum, with the stock price rising 2.24% to $230.46. Shareholders saw the stock price going 51.2% higher in the past 3 months.
WDC2.23%WESTERN DIGITAL CORP's (NASDAQ:WDC) shares surged 2.23% to reach $129.01 during the pre-market session on Monday. Shareholders saw the stock price going 85.59% higher in the past 3 months.

Our premarket gainers page will show you the full list.

STEEL DYNAMICS INC

NASDAQ:STLD (2/20/2026, 8:06:14 PM)

After market: 193.39 0 (0%)

193.39

+2.81 (+1.47%)


INTL FLAVORS & FRAGRANCES

NYSE:IFF (2/20/2026, 8:04:00 PM)

After market: 81.39 0 (0%)

81.39

-0.23 (-0.28%)


HOLOGIC INC

NASDAQ:HOLX (2/20/2026, 8:00:01 PM)

After market: 75.43 0 (0%)

75.43

+0.29 (+0.39%)


COOPER COS INC/THE

NASDAQ:COO (2/20/2026, 8:25:31 PM)

After market: 84.07 0 (0%)

84.07

+0.39 (+0.47%)


SEAGATE TECHNOLOGY HOLDINGS

NASDAQ:STX (2/20/2026, 8:06:19 PM)

After market: 409.388 -1.72 (-0.42%)

411.11

+2.14 (+0.52%)


WESTERN DIGITAL CORP

NASDAQ:WDC (2/20/2026, 8:10:21 PM)

After market: 284.75 -0.77 (-0.27%)

285.52

+0.85 (+0.3%)


SUPER MICRO COMPUTER INC

NASDAQ:SMCI (2/20/2026, 10:06:41 PM)

After market: 32.28 -0.14 (-0.43%)

32.42

+0.26 (+0.81%)


MICRON TECHNOLOGY INC

NASDAQ:MU (2/20/2026, 8:00:01 PM)

After market: 426.7 -1.47 (-0.34%)

428.17

+10.82 (+2.59%)


COINBASE GLOBAL INC -CLASS A

NASDAQ:COIN (2/20/2026, 8:25:29 PM)

After market: 171.09 -0.26 (-0.15%)

171.35

+5.41 (+3.26%)


ROBINHOOD MARKETS INC - A

NASDAQ:HOOD (2/20/2026, 8:00:01 PM)

After market: 75.9458 -0.16 (-0.22%)

76.11

+0.46 (+0.61%)



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