IoneerIONR +2.71%37 Market Cap is $318.22 Mil as of Jun. 27, 2026. GuruFocus rates IONR with a GF Score™ of 37/100. The stock has 1 warning sign investors should review. Among 2,688 Metals & Mining companies, Ioneer ranks better than 80.47% on this metric.
Market cap is the total market value to buy the whole company. It is equal to the share price times the number of Shares Outstanding (EOP). Ioneer's share price for the quarter that ended in Dec. 2025 was $4.8. Ioneer's Shares Outstanding (EOP) for the quarter that ended in Dec. 2025 was 66.70 Mil. Therefore, Ioneer's market cap for the quarter that ended in Dec. 2025 was $320.14 Mil.
Ioneer's quarterly market cap
declined
from Dec. 2024 ($234.98 Mil) to Jun. 2025 ($170.19 Mil) but then
increased
from Jun. 2025 ($170.19 Mil) to Dec. 2025 ($320.14 Mil).
Ioneer's annual market cap
declined
from Jun. 2023 ($477.48 Mil) to Jun. 2024 ($233.14 Mil) and
declined
from Jun. 2024 ($233.14 Mil) to Jun. 2025 ($170.19 Mil).
Enterprise Value is the theoretical takeover price. It is more comprehensive than market capitalization (market cap), which only includes common equity. Enterprise Value is calculated as the market cap plus debt and minority interest and preferred shares, minus total cash and cash equivalents. Ioneer's Enterprise Value for Today is $300.69 Mil.
Ioneer (NAS:IONR) Market Cap Explanation
Market cap is not the real price you pay for a company. If you buy the company and become its owner, you become the owner of the cash the company has, and you also assume the companys debt. The real price you pay is the Enterprise Value.
Warren Buffett uses the ratio of total market cap of all public traded companies over GDP to measure if the market is expensive. As of April 2012, the US total market cap is about $14.7 trillion, while the US GDP is about $15 trillion. The market was modestly overvalued.
Ioneer Market Cap Related Terms
Ioneer Market Cap Historical Data
* Premium members only.
The historical data trend for Ioneer's Market Cap can be seen below:
* For Operating Data section: All numbers are indicated by the unit behind each term and all currency related amount are in USD. * For other sections: All numbers are in millions except for per share data, ratio, and percentage. All currency related amount are indicated in the company's associated stock exchange currency.
For the Other Industrial Metals & Mining subindustry, Ioneer's Market Cap, along with its competitors' market caps and Market Cap data, can be viewed below:
* Competitive companies are chosen from companies within the same industry, with headquarter located in same country, with closest market capitalization; x-axis shows the market cap, and y-axis shows the term value; the bigger the dot, the larger the market cap. Note that "N/A" values will not show up in the chart.
Ioneer Market Cap vs Metals & Mining Industry
For the Metals & Mining industry and Basic Materials sector, Ioneer's Market Cap distribution charts can be found below:
* The bar in red indicates where Ioneer's Market Cap falls into.
Market cap is the short version of market capitalization. It is the total market value to buy the whole company. It is equal to the share price times the number of shares outstanding.
Ioneer's Market Cap for the fiscal year that ended in Jun. 2025 is calculated as
* For Operating Data section: All numbers are indicated by the unit behind each term and all currency related amount are in USD. * For other sections: All numbers are in millions except for per share data, ratio, and percentage. All currency related amount are indicated in the company's associated stock exchange currency.
Ioneer (IONR) has a Market Cap of $318.22 Mil as of Jun. 27, 2026. Market cap equals the total value of a company's shares: price times shares outstanding. View historical data on Ioneer and its competitors. According to the industry distribution chart, Ioneer ranks #525 out of 2688 companies in the Metals & Mining industry, placing it in the top 19.5%.
Is Ioneer's Market Cap too high?
Ioneer's current Market Cap is $318.22 Mil. The Metals & Mining industry median Market Cap is 21.64. Ioneer's value of $318.22 Mil is 1370.8% above this industry median. Based on the distribution chart, Ioneer ranks #525 out of 2688 companies in the Metals & Mining industry, which is in the top quartile — a strong position relative to peers. Overall, Ioneer has a GF Score™ of 37/100, reflecting its overall financial health beyond just this single metric.
How does Ioneer's Market Cap compare to competitors?
According to the Metals & Mining industry distribution chart, Ioneer ranks #525 out of 2688 companies for Market Cap. This places Ioneer in the top 20% of its industry — outperforming the majority of peers. The industry median Market Cap is 21.64. Ioneer's value of $318.22 Mil is 1370.8% above this benchmark. See the competitive comparison table and distribution chart on this page for a detailed peer-by-peer breakdown.
What is a good Market Cap for a Metals & Mining company?
The median Market Cap among Metals & Mining companies is 21.64, based on 2,688 companies in the industry. Companies in the top quartile (top 25%) have a Market Cap significantly above this median, while those in the bottom quartile fall well below. However, Market Cap should not be evaluated in isolation — investors should consider it alongside profitability, growth, and financial strength metrics. Ioneer's current Market Cap of $318.22 Mil is 1370.8% above the industry median. Use the industry distribution chart on this page to see where any company falls relative to its peers.
What does a high Market Cap mean?
A high Market Cap can signal that a stock is expensive relative to its fundamentals. Market cap equals the total value of a company's shares: price times shares outstanding. View historical data on Ioneer and its competitors. For the Metals & Mining industry, the median Market Cap is 21.64 — values significantly above this may indicate overvaluation, while values below may suggest a bargain or underlying issues. Ioneer's current Market Cap is $318.22 Mil. However, context matters — high-growth companies often justify higher valuations. Always evaluate alongside other metrics like GF Score™ and GF Value™.
Is Ioneer stock overvalued right now?
Ioneer (IONR) has a current Market Cap of $318.22 Mil. The current Market Cap is $318.22 Mil and 1370.8% above the Metals & Mining industry median of 21.64. Ioneer's overall GF Score™ is 37/100 with 1 warning sign to review. Investors should evaluate multiple metrics — including profitability, growth, and financial strength — before making a decision.
How is Market Cap calculated?
Market Cap is calculated from a company's financial statements. For Ioneer (IONR), the current Market Cap is $318.22 Mil as of Jun. 27, 2026. GuruFocus calculates this using data sourced from SEC filings and annual reports. See the calculation section and 30-year financial data on this page for the full breakdown.
Ioneer Ltd is a mineral exploration and development company. The company's focus is on the Rhyolite Ridge Lithium-Boron Project located in Nevada, USA. Geographically, the group has a business presence in Australia and North America. The company's focus is to develop a U.S.-based source of lithium and boron.
37GF Score
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