Natural Alternatives International (NAII) Stock Chart & Stock Price History $3.25 +0.24 (+7.97%) As of 09/18/2025 04:00 PM Eastern This is a fair market value 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 51.78%, with a year-to-date return of -24.59%. In the past month, the stock has decreased 15.58%, reflecting recent market activity. As of the latest close, Natural Alternatives International traded at $3.25 with a market cap of $20.08 million and volume of 6,994 shares. Five years ago, the stock traded at $6.77, representing a 51.99% decrease over that period. At the time, it had a market cap of $45.96 million and a volume of 7,081 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. Text HELP for help/customer support. Unsubscribe at any time by replying "STOP" to any text message that you receive from MarketBeat or by visiting our mailing preferences page. Read our full terms of service and privacy policy. 5 Day Performance-7.14%1 Month Performance-15.58%3 Month Performance-5.50%Year-To-Date Performance-24.59%1 Year Performance-51.78%5 Year Performance-51.99% NAII Stock Chart for Friday, September, 19, 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 Capitalization09/18/2025$3.01$3.25+7.97%$3.38$3.016,994 shs$20.08 million09/17/2025$3.13$3.01-3.83%$3.17$2.895,541 shs$18.60 million09/16/2025$3.23$3.13-3.10%$3.21$3.114,903 shs$19.34 million09/15/2025$3.50$3.23-7.71%$3.45$3.226,451 shs$19.96 million09/12/2025$3.59$3.50-2.51%$3.58$3.442,276 shs$21.63 million09/11/2025$3.37$3.59+6.53%$3.87$3.3612,150 shs$22.19 million09/10/2025$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 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. 09/04/2025$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 million08/27/2025$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 million Related Companies Assertio Stock Chart Invizyne Technologies Stock Chart IGM Biosciences Stock Chart InflaRx Stock Chart Repare Therapeutics Stock Chart BeyondSpring Stock Chart Context Therapeutics Stock Chart Sutro Biopharma Stock Chart CervoMed Stock Chart Acumen Pharmaceuticals 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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