What's going on in today's session: S&P500 movers

Last update: Aug 21, 2025

Curious about the top performers within the S&P500 index in the middle of the day on Thursday? Dive into the list of today's session's top gainers and losers for a comprehensive overview.

Top gainers

Ticker	Change	Comment
NDSN	5.01%	NORDSON CORP's (NASDAQ:NDSN) stock price displayed strong growth, advancing 5.01% and reaching $224.22 during Thursday's session. A press release (Nordson Corporation Reports Third Quarter Fiscal 2025 Results and Updates Full Year Guidance) was released yesterday.
PKG	4.99%	Positive market sentiment drove PACKAGING CORP OF AMERICA's (NYSE:PKG) stock price up by 4.99% to $208.0 during Thursday's session.
SW	3.72%	Investors celebrated as SMURFIT WESTROCK PLC (NYSE:SW) experienced a 3.72% rise in its shares, closing at $43.51 during Thursday's session. In the last 6 months the share price dropped with 21.09%.
HPE	3.11%	HEWLETT PACKARD ENTERPRISE's (NYSE:HPE) stock price is advancing with 3.11% to a price of $21.7. In the last 3 months the share price increased with 20.78%.
BG	2.71%	BUNGE GLOBAL SA's (NYSE:BG) stock price is advancing with 2.71% to a price of $84.61.
MRK	2.68%	MERCK & CO. INC. (NYSE:MRK) witnessed a notable 2.68% uptick in its shares, reaching $86.93 during Thursday's session. In the last year the share price dropped with 27.39%.
IP	2.28%	Investors celebrated as INTERNATIONAL PAPER CO (NYSE:IP) experienced a 2.28% rise in its shares, closing at $48.08 during Thursday's session.
DAY	2.05%	Investors celebrated as DAYFORCE INC (NYSE:DAY) experienced a 2.05% rise in its shares, closing at $68.78 during Thursday's session. A press release (DAY Stock Alert: Halper Sadeh LLC Is Investigating Whether the Sale of Dayforce, Inc. Is Fair to Shareholders) was released earlier today.
REGN	1.84%	REGENERON PHARMACEUTICALS's (NASDAQ:REGN) stock price increased by 1.84% to $601.91. A press release (EYLEA HD® (aflibercept) Injection 8 mg Applications for Expanded U.S. Label and Prefilled Syringe Receive FDA Review Period Extension) was released yesterday.
HUM	1.63%	HUMANA INC (NYSE:HUM) witnessed a notable 1.63% uptick in its shares, reaching $294.74 during Thursday's session. Earlier today the company had a press release: New Research from Humana Finds Value-Based Care Delivers Higher Quality of Care for Heart Failure Patients.

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

Today's top losers

Ticker	Change	Comment
FSLR	-6.58%	FIRST SOLAR INC's (NASDAQ:FSLR) shares fell 6.58% to $192.86. Shareholders saw the stock price going 30.34% higher in the past 3 months.
WMT	-4.65%	The market experienced a 4.65% downturn in WALMART INC's (NYSE:WMT) stock price, closing at $97.8 during Thursday's session. The company's earnings where released Yesterday. A press release (Walmart reports revenue growth of 4.8%, up 5.6% in constant currency (cc)) was released earlier today.
ENPH	-3.4%	ENPHASE ENERGY INC's (NASDAQ:ENPH) stock price encountered a 3.4% decline, reaching $34.47 during Thursday's session. Shareholders saw the stock price going 44.98% lower is the past 6 months.
PCG	-3.22%	P G & E CORP's (NYSE:PCG) stock price is declining with 3.22% to a price of $14.87.
DHI	-2.97%	DR HORTON INC's (NYSE:DHI) stock price decreased by 2.97% to $158.51. In the last 3 months the share price increased with 37.69%.
FTNT	-2.95%	The market experienced a 2.95% downturn in FORTINET INC's (NASDAQ:FTNT) stock price, closing at $77.26 during Thursday's session. Earlier today the company had a press release: Fortinet, Inc. (FTNT) Investors Who Lost Money – Contact Law Offices of Howard G. Smith About Securities Fraud Investigation.
LII	-2.89%	There was a notable decline in LENNOX INTERNATIONAL INC's (NYSE:LII) shares, as they dropped 2.89% to $572.04 during Thursday's session.
UAL	-2.66%	Investors witnessed a 2.66% decrease in UNITED AIRLINES HOLDINGS INC's (NASDAQ:UAL) stock price, which closed at $97.18 during Thursday's session. In the last 3 months the stock gained 33.74%.
MRNA	-2.53%	The market experienced a downward movement in MODERNA INC's (NASDAQ:MRNA) stock price, closing at $26.21 with a 2.53% decrease during Thursday's session. A press release (Moderna to Present at Upcoming Conferences in September 2025) was released earlier today.
ALL	-2.44%	ALLSTATE CORP's (NYSE:ALL) shares fell 2.44% to $208.41 during Thursday's session. A press release (July 2025 Monthly Release) was released earlier today.

For the full top loser list go to our top losers page.