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

By Mill Chart - Last update: Aug 18, 2025

Let's have a look at what is happening on the US markets before the opening bell on Monday. Below you can find the top S&P500 gainers and losers in today's pre-market session.


premarket

Gainers

TickerChangeComment
DAY24.62%DAYFORCE INC's (NYSE:DAY) shares rose 24.62% to $65.9 during Monday's pre-market session. In the last 6 months the stock lost 20.39%.
FSLR5.43%FIRST SOLAR INC's (NASDAQ:FSLR) shares rose 5.43% to $210.8 during Monday's pre-market session. Following yesterday's 11.05% increase, FSLR demonstrates further positive momentum in today's pre-market session with a 5.43% gain.
ENPH3.33%Exciting news for ENPHASE ENERGY INC (NASDAQ:ENPH) as their shares soared 3.33% to $36.0 during the pre-market session on Monday. Shareholders saw the stock price going 30.87% lower in the past 3 months.
UNH2.76%UNITEDHEALTH GROUP INC (NYSE:UNH) recorded a 2.76% increase in share price during the pre-market session, reaching $312.41 on Monday. Following yesterday's 11.98% increase, UNH demonstrates further positive momentum in today's pre-market session with a 2.76% gain.
EPAM2.66%Investors witnessed a remarkable surge in EPAM SYSTEMS INC (NYSE:EPAM) during Monday's pre-market session, with the stock price rising 2.66% to $161.9. Shareholders saw the stock price going 40.74% lower is the past 6 months.
CVS2.07%CVS HEALTH CORP (NYSE:CVS) experienced an impressive 2.07% increase in share price, reaching $70.02 during the pre-market session on Monday.
BIIB2.04%BIOGEN INC (NASDAQ:BIIB) recorded a 2.04% increase in share price during the pre-market session, reaching $141.42 on Monday. The stock is trading 31.36% lower than a year ago.

For the full premarket gainers list go to our premarket gainers page.

BIOGEN INC

NASDAQ:BIIB (2/23/2026, 8:00:02 PM)

After market: 196.34 0 (0%)

196.34

+4.31 (+2.24%)


UNITEDHEALTH GROUP INC

NYSE:UNH (2/23/2026, 8:19:50 PM)

After market: 282.22 -0.12 (-0.04%)

282.34

-7.66 (-2.64%)


CVS HEALTH CORP

NYSE:CVS (2/23/2026, 8:04:00 PM)

After market: 76.92 -0.08 (-0.1%)

77

+0.31 (+0.4%)


FIRST SOLAR INC

NASDAQ:FSLR (2/23/2026, 8:00:00 PM)

After market: 244.544 +2.39 (+0.99%)

242.15

+0.27 (+0.11%)


EPAM SYSTEMS INC

NYSE:EPAM (2/23/2026, 8:04:00 PM)

After market: 129.96 0 (0%)

129.96

-8.89 (-6.4%)


ENPHASE ENERGY INC

NASDAQ:ENPH (2/23/2026, 8:00:02 PM)

After market: 47.49 +0.09 (+0.19%)

47.4

+0.84 (+1.8%)


DAYFORCE INC

NYSE:DAY (2/3/2026, 8:09:28 PM)

After market: 69.97 +0.11 (+0.16%)

69.86

+0.94 (+1.36%)



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