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Let's take a look at the S&P500 stocks that are experiencing unusual volume in today's session.

By Mill Chart

Last update: May 16, 2025

Let's have a look at the S&P500 stocks with an unusual volume in today's session.

Top unusual volume stocks

TickerChangeComment
UNH3.04%UNITEDHEALTH GROUP INC (NYSE:UNH) has an unusual volume of 37.01M shares. UNH is advancing 3.04% today. The average volume over the last 50 days is 11.11M, making today's volume 233.0% above the average. This signifies a notable change in market participation. Two days ago the company had a press release: UNH INVESTOR ALERT: Bronstein, Gewirtz & Grossman LLC Announces That UnitedHealth Group Incorporated Investors With Substantial Losses Have Opportunity to Lead Class Action Lawsuit.
NRG1.42%The trading activity for NRG ENERGY INC (NYSE:NRG) has surged with a volume of 4.53M shares today. Shares in NRG are on the rise, with a gain of 1.42% observed in today's trading session. The average daily volume over 50 days is 3.36M, so this is 34.8% above the average volume. Yesterday the company had a press release: NRG Energy, Inc. Announces Redemption of Any and All Outstanding Convertible Senior Notes due 2048.
SMCI3.34%SUPER MICRO COMPUTER INC's (NASDAQ:SMCI) traded a high volume of 70.35M shares. SMCI is experiencing an advancement of 3.34% in its share price today. The average daily volume over 50 days is 56.0M, so this is 25.62% above the average volume.
FI4.67%With 6.32M shares traded so far, FISERV INC (NYSE:FI) is experiencing an unusual level of activity today. The market is favoring FI today, as its share price records a notable increase of 4.67%. The current trading volume is 48.15% above the average 50-day volume. This indicates a significant deviation from the average trading activity.
AMAT-6.15%APPLIED MATERIALS INC (NASDAQ:AMAT) has an unusual volume of 10.03M shares today. The price of AMAT is experiencing a downturn, with a decrease of 6.15%. With an average volume of 7.96M over the past 50 days, the current volume is 25.95% above the average. This deviation signals a potential shift in market dynamics. Yesterday the company had a press release: Applied Materials Announces Second Quarter 2025 Results.
CHTR0.93%The stock of CHARTER COMMUNICATIONS INC-A (NASDAQ:CHTR) has caught attention with a significant volume of 2.53M shares today. Shares in CHTR are on the rise, with a gain of 0.93% observed in today's trading session. The average volume over the last 50 days is 1.45M, making today's volume 73.87% above the average. This signifies a notable change in market participation. Earlier today the company had a press release: CHTR Stock Alert: Halper Sadeh LLC Is Investigating Whether the Merger of Charter Communications, Inc. Is Fair to Shareholders.

Our unusual volume stocks screener will show you the full list.

UNITEDHEALTH GROUP INC

NYSE:UNH (6/25/2025, 9:30:02 AM)

303.26

-2.36 (-0.77%)


SUPER MICRO COMPUTER INC

NASDAQ:SMCI (6/25/2025, 9:30:00 AM)

43.28

+0.44 (+1.03%)


APPLIED MATERIALS INC

NASDAQ:AMAT (6/24/2025, 8:15:16 PM)

Premarket: 181.35 +1.17 (+0.65%)

180.18

+8.22 (+4.78%)


NRG ENERGY INC

NYSE:NRG (6/25/2025, 9:30:02 AM)

154.235

+0.56 (+0.36%)


FISERV INC

NYSE:FI (6/25/2025, 9:30:02 AM)

174

+1.34 (+0.78%)


CHARTER COMMUNICATIONS INC-A

NASDAQ:CHTR (6/25/2025, 9:30:00 AM)

401.785

-1.71 (-0.43%)



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