Arthur J. Gallagher & Co. (AJG) Stock Chart & Stock Price History $305.27 +2.63 (+0.87%) Closing price 03:59 PM EasternExtended Trading$305.30 +0.04 (+0.01%) As of 07:56 PM Eastern Extended trading is trading that happens on electronic markets outside of regular trading hours. This is a fair market value extended hours price provided by Polygon.io. Learn more. Add Compare Share Share Chart Stock AnalysisAnalyst ForecastsChartCompetitorsDividendEarningsFinancialsHeadlinesInsider TradesOptions ChainOwnershipSEC FilingsShort InterestSustainabilityTrendsBuy This Stock Arthur J. Gallagher & Co. Stock Price Performance The Arthur J. Gallagher & Co. (AJG) stock chart highlights key performance trends across multiple timeframes. Over the last 12 months, the stock's price has increased 5.45%, with a year-to-date return of 7.54%. In the past month, the stock has decreased 0.90%, reflecting recent market activity. As of the latest close, Arthur J. Gallagher & Co. traded at $302.49 with a market cap of $77.56 billion and volume of 1.57 million shares. Five years ago, the stock traded at $103.47, representing a 195.03% increase over that period. At the time, it had a market cap of $19.81 billion and a volume of 1.27 million shares. Receive AJG Stock News and Ratings via EmailSign-up to receive the latest news and ratings for Arthur J. Gallagher & Co. and its competitors with MarketBeat's FREE daily newsletter. Email Address 5 Day Performance+4.32%1 Month Performance-0.90%3 Month Performance-9.62%Year-To-Date Performance+7.54%1 Year Performance+5.45%5 Year Performance+195.03% AJG Stock Chart for Thursday, August, 21, 2025 AJG Chart by TradingView Arthur J. Gallagher & Co. Stock Price History Daily Weekly Monthly Yearly Time Frame Custom Range 1 Month 3 Months 6 Months Year-to-Date 1 Year 3 Year 5 Year Time Frame Start Date End Date Export to Excel DateOpening PriceClosing PriceHighLowVolumeMarket Capitalization08/21/2025$302.49$305.27+0.92%$306.39$301.261.15 million shs$78.27 billion08/20/2025$300.75$302.49+0.58%$305.13$300.641.57 million shs$77.56 billion08/19/2025$294.66$300.75+2.07%$301.05$294.731.13 million shs$77.11 billion08/18/2025$292.62$294.66+0.70%$296.53$291.081.38 million shs$75.55 billion08/15/2025$293.41$292.62-0.27%$294.72$292.421.24 million shs$75.03 billion08/14/2025$295.23$293.41-0.62%$295.50$289.931.28 million shs$75.23 billion08/13/2025$290.61$295.23+1.59%$295.44$290.921.34 million shs$75.70 billion08/12/2025$289.02$290.61+0.55%$291.21$286.821.28 million shs$74.51 billion08/11/2025$290.13$289.02-0.38%$291.69$286.171.54 million shs$74.11 billion08/08/2025$289.91$290.13+0.08%$293.97$288.421.73 million shs$74.39 billion Get the Latest News and Ratings for AJG and Related StocksEnter your email address below to receive the latest news and analysts' ratings for Arthur J. Gallagher & Co. and its competitors with MarketBeat's FREE daily newsletter. 08/07/2025$286.47$289.91+1.20%$290.07$285.083.12 million shs$74.33 billion08/06/2025$286.08$286.47+0.14%$288.00$284.141.14 million shs$73.45 billion08/05/2025$284.54$286.08+0.54%$288.02$282.531.68 million shs$73.27 billion08/04/2025$284.06$284.54+0.17%$286.87$282.231.78 million shs$72.87 billion08/01/2025$287.48$284.06-1.19%$286.00$277.532.79 million shs$72.75 billion07/31/2025$285.49$287.48+0.70%$290.93$281.832.55 million shs$73.62 billion07/30/2025$287.99$285.49-0.87%$291.15$284.942.92 million shs$73.11 billion07/29/2025$309.12$287.99-6.83%$309.05$287.614.08 million shs$73.75 billion07/28/2025$315.15$309.12-1.91%$315.00$308.291.24 million shs$79.17 billion07/25/2025$309.35$315.15+1.87%$315.48$310.10897,383 shs$80.71 billion07/24/2025$310.65$309.35-0.42%$311.83$309.00738,163 shs$79.22 billion07/23/2025$312.86$310.65-0.71%$313.64$308.74659,358 shs$79.56 billion07/22/2025$308.04$312.86+1.56%$313.03$308.321.11 million shs$80.12 billion07/21/2025$313.05$308.04-1.60%$313.13$307.91772,663 shs$78.89 billion Related Companies ERIE Stock Chart WTW Stock Chart AON Stock Chart BRO Stock Chart L Stock Chart MMC Stock Chart RYAN Stock Chart CRD.B Stock Chart EHTH Stock Chart ETOR Stock Chart Receive AJG Stock News and Ratings via EmailSign-up to receive the latest news and ratings for Arthur J. Gallagher & Co. and its competitors with MarketBeat's FREE daily newsletter. This page (NYSE:AJG) was last updated on 8/21/2025 by MarketBeat.com Staff From Our PartnersMarket Panic: Trump Just Dropped a Bomb on Your Stockstock Market Panic: Trump Just Dropped a Bomb on Your Stocks The market is in freefall—and Trump's new tarif...American Alternative | SponsoredAlex’s “Next Magnificent Seven” stocksThe original “Magnificent Seven” turned $7K into $1.18 million. Now, Alex Green has identified AI’s Next Ma...The Oxford Club | SponsoredBONUS GUIDE - Ben Stein Prepares For the Next Financial CrisisWith inflation high, debt soaring, and global tensions rising, a financial storm may be brewing. Economist ...Goldco Precious Metals | SponsoredGENIUS Act: Cancel Your Money?A new law called the GENIUS Act could quietly trigger the most radical shift in American finance in decades. 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