Natural Alternatives International (NAII) Stock Chart & Stock Price History $3.37 +0.09 (+2.74%) Closing price 04:00 PM EasternExtended Trading$3.32 -0.05 (-1.48%) As of 04:07 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 AnalysisChartCompetitorsEarningsHeadlinesOwnershipSEC FilingsShort InterestTrendsBuy This Stock Natural Alternatives International Stock Price Performance The Natural Alternatives International (NAII) stock chart highlights key performance trends across multiple timeframes. Over the last 12 months, the stock's price has decreased 47.75%, with a year-to-date return of -21.81%. In the past month, the stock has decreased 8.92%, reflecting recent market activity. As of the latest close, Natural Alternatives International traded at $3.34 with a market cap of $20.61 million and volume of 4,286 shares. Five years ago, the stock traded at $7.29, representing a 53.77% decrease over that period. At the time, it had a market cap of $48.20 million and a volume of 3,394 shares. Receive NAII Stock News and Ratings via EmailSign-up to receive the latest news and ratings for Natural Alternatives International and its competitors with MarketBeat's FREE daily newsletter. Subscribe Now View SMS TermsBy entering your phone number and clicking the sign-up button, you agree to receive periodic text messages from MarketBeat at the phone number you submitted, including texts that may be sent using an automatic telephone dialing system. Message and data rates may apply. Message frequency will vary. Messages will consist of stock alerts, news stories, and partner advertisements/offers. Consent is not a condition of the purchase of any goods or services. 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Read our full terms of service and privacy policy. 5 Day Performance-6.39%1 Month Performance-8.92%3 Month Performance-2.32%Year-To-Date Performance-21.81%1 Year Performance-47.75%5 Year Performance-53.77% NAII Stock Chart for Wednesday, September, 10, 2025 NAII Chart by TradingView Natural Alternatives International 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 Capitalization09/10/2025$3.34$3.37+1.02%$3.40$3.325,615 shs$20.83 million09/09/2025$3.41$3.34-2.17%$3.40$3.284,286 shs$20.61 million09/08/2025$3.60$3.41-5.28%$3.83$3.4021,585 shs$21.07 million09/05/2025$3.81$3.60-5.51%$3.93$3.605,033 shs$22.25 million09/04/2025$3.63$3.81+4.96%$3.81$3.741,536 shs$23.55 million09/03/2025$3.68$3.63-1.22%$3.63$3.63522 shs$22.43 million09/02/2025$3.88$3.68-5.16%$3.63$3.63815 shs$22.71 million09/01/2025$3.88$3.88$3.78$3.613,252 shs$23.95 million08/29/2025$3.73$3.88+3.89%$3.78$3.613,252 shs$23.95 million08/28/2025$3.58$3.73+4.19%$3.78$3.613,252 shs$23.05 million Get the Latest News and Ratings for NAII and Related StocksEnter your email address below to receive the latest news and analysts' ratings for Natural Alternatives International and its competitors with MarketBeat's FREE daily newsletter. 08/27/2025$3.67$3.58-2.45%$3.85$3.588,515 shs$22.12 million08/26/2025$3.94$3.67-6.85%$3.93$3.6721,349 shs$22.68 million08/25/2025$3.98$3.94-0.88%$3.97$3.9012,869 shs$24.35 million08/22/2025$3.98$3.98-0.03%$4.03$3.961,379 shs$24.57 million08/21/2025$4.00$3.98-0.60%$3.96$3.861,528 shs$24.57 million08/20/2025$3.85$4.00+3.90%$4.00$3.858,072 shs$24.72 million08/19/2025$3.88$3.85-0.65%$3.87$3.85955 shs$23.79 million08/18/2025$3.84$3.88+0.91%$3.88$3.852,363 shs$23.94 million08/15/2025$3.77$3.84+1.86%$3.87$3.805,915 shs$23.73 million08/14/2025$3.77$3.77$3.77$3.77279 shs$23.29 million08/13/2025$3.80$3.77-0.66%$3.90$3.773,411 shs$23.30 million08/12/2025$3.70$3.80+2.71%$3.82$3.73461 shs$23.45 million08/11/2025$3.70$3.70-0.14%$3.83$3.628,985 shs$22.83 million Related Companies Entera Bio Stock Chart Oramed Pharmaceuticals Stock Chart KALA BIO Stock Chart ImmunoPrecise Antibodies Stock Chart OKYO Pharma Stock Chart Ovid Therapeutics Stock Chart Vaxart Stock Chart Whitehawk Therapeutics Stock Chart Atara Biotherapeutics Stock Chart Quince Therapeutics Stock Chart Receive NAII Stock News and Ratings via EmailSign-up to receive the latest news and ratings for Natural Alternatives International and its competitors with MarketBeat's FREE daily newsletter. 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