Top Stock Movers: Nividia Slips, Halliburton and BigBear Ai soars

September 23, 2025

After several days of gains, the market slipped today.

• Fed Chair Jerome Powell suggests stagflation.
• Even after new highs, all major indices closed lower.
• The technology sector experienced major lows with big tech stocks like Amazon, Oracle and Nvidia experiencing steep dips.

During trading hours, the S&P 500 and DJIA reached new 52-week highs today but soon slipped and closed 0.6% and 0.2% lower, respectively. The Nasdaq was down 0.9%. Meanwhile, the Russell 2000, even after reaching a 52-week high at $2488.84, it ended slipping 0.2% at closing.

The tech sector suffered heavily, with major stocks like Nvidia down 2.8% and Amazon down 3%, becoming the worst DJIA performer. Oracle, after soaring high the past couple of weeks, was down 4.4%.

However, the energy sector performed well, pushed ahead by rising oil and gas prices. This made Halliburton a top S&P 500 performer, up 7.3% at closing. BigBear.ai holdings was yet another top gainer, up 12.8%.

In his speech today in Rhode Island, Fed Chair Jerome Powell stated that job growth has been slow and inflation is tilting upward, hinting at unstable economic times.

“The unemployment rate is low but has edged up. Job gains have slowed, and the downside risks to employment have risen. At the same time, inflation has risen recently and remains somewhat elevated. In recent months, it has become clear that the balance of risks has shifted, prompting us to move our policy stance closer to neutral at our meeting last week.”

There is evidence of stagflation, but the economy is resilient to the uncertainty posed by global trade tensions and tariffs.

Here are the Stocks that made the most market moves today

Five S&P 500 stocks making big moves today are:

• Halliburton Co HAL: +7.3%
• McKesson Corp MCK : +6.4%
• Texas Pacific Land Corp : +6.2%
• Paramount Skydance Corp PSKY: +6%
• Cardinal Health Inc CAH: +4.8%

The worst-performing five S&P 500 stocks today are:

• Generac Holdings Inc GNRC: -10.3%
• Vistra Corp : -6.3%
• Synopsys Inc SNPS: -4.8%
• Regeneron Pharmaceutical REGN: -4.7%
• Oracle Corp ORCL: -4.4%

Stocks also worth noting include:

• Nvidia NVDA: -2.8%
• Amazon  : -3%
• Intel INTC:+2%
• Bigbear ai Holdings BBAI: +12.8%
• D-wave Quantum Inc QBTS: +7.2%.

Nvidia slips after riding high on the OpenAI deal

A day after the $100 billion deal to invest in OpenAI, Nvidia's  (NVDA)  stock slipped 2.8% today.

Amidst concerns surrounding the deal, after a $5 billion investment in Intel, investment bank DA Davidson cautioned that Nvidia is becoming the “investor of last resort.”

More Nvidia:

• Analysts revamp Nvidia stock outlook on its investment in Intel
• Nvidia suffers a major blow from China
• Nvidia spending billions to spread its AI dominance

While it keeps the firm's Buy rating and $210 price target, it raised questions about OpenAI’s overextended commitments and Nvidia’s past record of bailing out firms like CoreWeave, as reported at The Fly.

Related: Nvidia's deal with OpenAI 'looks a lot like financial theatre'

Broader concerns about regulatory scrutiny, competitive dynamics, and Fed Chair Powell’s comments on market overvaluation weighed on investor sentiment, contributing to the stock's decline.

BigBear.ai's stock soared after supporting the U.S Navy

Bigbear.ai  (BBAI) , a leading provider of mission-ready AI for defense and national security, saw its stock soar 12.8% after it announced today that it will deploy advanced AI and orchestration technologies to support the U.S. Naval Forces Southern Command/U.S/ 4th Fleet at UNITAS 2025.

UNITAS is one of the world’s longest-running multinational maritime exercises. This year, 8,000 personnel from 26 allied and partner nations will participate.

Kevin McAleenan, Ceo of BigBear.ai said,

In complex maritime environments – where illicit trafficking, illegal arms smuggling, and other transnational threats strain limited resources– our AI-driven insights can provide operators with enhanced situational awareness and the advantage needed to achieve mission success.

Energy sector ahead, Halliburton stock rises

Halliburton  (HAL) emerged as a top S&P 500 performer today, up 7.3%, as rising oil prices fueled by geopolitical risks boosted energy and oil stocks.

A notable player in the oilfield sector, Halliburton has a market cap of $20.6 billion, a share price of $24.37, and a 10.74% loss year-to-date.

Given the tension between NATO countries and President Doland Trump’s urging countries to stop buying oil from Russia, oil prices have gone up, directly impacting Halliburton stock, which is beneficially positioned.

Related: Amazon is selling a 2-in-1 laptop and tablet for $63 that's a 'productivity powerhouse'