GMTL vs RIO vs IONR Stock Comparison

Guardian Metal Resources, Rio Tinto and Ioneer Prices as of Oct 29, 2026 Peers: Industry group
RIO Rio Tinto Plc
$83.25 -11.6% 1M +14.7% 1Y
Market cap
$135.12B
P/E
–
Revenue (TTM)
—
Div. yield
5.59%
Iron Ore Basic Materials
3 wins
IONR ioneer Ltd
$2.82 -10.5% 1M -41.5% 1Y
Market cap
$188.56M
P/E
–
Revenue (TTM)
—
Div. yield
–
Lithium Basic Materials

Head to Head

3 decided of 12

Rio Tinto leads on 3 of the 12 questions below (Rio Tinto 3). Which ones matter depends on what you are buying for; a cheap multiple and slow growth often come together.

QuestionGMTLRIOIONRLeader
Larger companyMarket capitalisation $314.97M $135.12B $188.56M RIO
Cheaper on earningsLower P/E, profitable companies only -31.4x — — –
Cheaper on forward earningsLower price / next fiscal year consensus EPS — 10.6x — –
Faster revenue growthRevenue growth, trailing twelve months — — — –
More profitableNet margin, trailing twelve months — — — –
Better return on capitalReturn on invested capital — — — –
Less leveragedLower net debt / EBITDA — — — –
Higher dividend yieldTrailing dividend yield — 5.59% — –
Better 1-year returnPrice return, last 12 months — +14.7% -41.5% RIO
Better 5-year returnAnnualised price return, 5 years — +5.6%/yr — –
Less volatileAnnualised volatility, 1 year 92.5% 30.9% 79.3% RIO
Higher overall scoreMean of the five percentile scores vs peers — — — –

Percentile Scorecard

GMTLRIOIONR

Each axis is the mean percentile of its metrics against the company's industry group. 100 is the best in the group, 50 the middle.

Scores by Axis

AxisGMTLRIOIONR
Valuation 30 #115 of 163 – –
Growth – – –
Profitability – – –
Financial Health 95 #9 of 164 21 #130 of 164 98 #4 of 164
Shareholder Returns – 98 #3 of 108 –
Overall – – –
  • GMTL ranked among 176 companies in Metals and Mining
  • RIO ranked among 176 companies in Metals and Mining
  • IONR ranked among 176 companies in Metals and Mining

Price Performance

Price return, split-adjusted, before dividends. Click a name to hide or show it.

Returns

PeriodGMTLRIOIONRSPY
1 month -37.0%-11.6%-10.5% +0.7%
3 months -43.7%-14.3%-15.3% +3.7%
6 months -67.9%-17.1%-26.4% +7.1%
Year to date —+4.0%-41.3% +12.8%
1 year —+14.7%-41.5% +11.9%
3 years —+29.7%-26.8% +85.2%
3 years, per year —+9.0%-9.9% +22.8%
5 years —+31.6%— +67.6%
5 years, per year —+5.6%— +10.9%
10 years —+141.1%— +262.0%
10 years, per year —+9.2%— +13.7%

Risk

MeasureGMTLRIOIONRSPY
Volatility, 1Y 92.5%30.9%79.3% 12.7%
Downside volatility, 1Y 91.8%32.3%76.8% 12.6%
Beta vs S&P 500, 1Y 2.181.281.45 1.00
Return / volatility, 1Y —0.48-0.52 0.94
Max drawdown, 5Y -76.8%-39.0%-87.8% -25.4%
From 52-week high -73.6%-25.7%-55.9% -1.2%
52-week high $20.64$112.04$6.39 $779.14
52-week low $4.78$67.89$2.55 $631.97

Valuation History

Weekly multiples on trailing twelve-month fundamentals. Negative or extreme readings (a loss year, a collapsed denominator) are left out so the chart stays readable.

MultipleGMTLRIOIONR
P/E now vs peer median -31.4xmedian 13.2x —median 13.2x —median 13.2x
P/S now vs peer median —median 3.1x —median 3.1x —median 3.1x
EV/EBITDA now vs peer median —median 7.2x —median 7.2x —median 7.2x
P/FCF now vs peer median -52.3xmedian 15.2x —median 15.2x —median 15.2x
P/B now vs peer median 3.4xmedian 2.2x 2.0xmedian 2.2x 0.7xmedian 2.2x
PEG now vs peer median —median 0.30 —median 0.30 —median 0.30

Financial History

Reported figures by fiscal period, placed on the calendar year (or quarter) each period ended in, so companies with different fiscal years line up.

Trailing twelve monthsGMTLRIOIONR
Cash & equivalents $52.46M $8.87B $58.84M
Total debt – $16.90B –
Shares (diluted) 57.79M 1.63B 60.35M
Enterprise value $262.51M $95.63B $54.17M

All Metrics

58 metrics · best in bold

Bold marks the best reading: the lowest positive value for multiples, leverage and payout, the highest for everything else. The bar under each value is its percentile against that company's own peers. Hover a value for its rank and the peer median.

Valuation

12 metrics
MetricGMTLRIOIONR
P/E -31.4x – –
P/FCF -52.3x – –
P/Operating cash flow – – –
P/S – – –
P/B 3.4x 2.0x 0.7x
P/Tangible book 6.0x 2.2x 0.7x
EV/EBITDA – – –
EV/EBIT – – –
EV/Revenue – – –
EV/FCF – – –
EV/Operating cash flow – – –
PEG (3Y EPS CAGR) – – –

Growth

14 metrics
MetricGMTLRIOIONR
Revenue growth (1Y) – – –
Revenue CAGR (3Y) – – –
Gross profit growth (1Y) – – –
Gross profit CAGR (3Y) – – –
Operating income growth (1Y) – – –
Operating income CAGR (3Y) – – –
Net income growth (1Y) – – –
Net income CAGR (3Y) – – –
EPS growth (1Y) – – –
EPS CAGR (3Y) – – –
Operating cash flow growth (1Y) – – –
Operating cash flow CAGR (3Y) – – –
Free cash flow growth (1Y) – – –
Free cash flow CAGR (3Y) – – –

Profitability

14 metrics
MetricGMTLRIOIONR
Gross margin – – –
EBITDA margin – – –
Operating margin – – –
Pretax margin – – –
Net margin – – –
FCF margin – – –
Operating cash flow margin – – –
Return on equity – – –
Return on assets – – –
Return on invested capital – – –
Return on capital employed – – –
Asset turnover – – –
Cash conversion (OCF / net income) – – –
Stock comp / revenue – – –

Financial Health

11 metrics
MetricGMTLRIOIONR
Debt / assets – – –
Debt / equity – 0.3x –
Net debt / EBITDA – – –
Debt / FCF – – –
Liabilities / assets 3.7% – 0.9%
Equity / assets 96.3% – 99.1%
Interest coverage – – –
Current ratio 15.3x 1.4x 25.8x
Quick ratio 14.8x 1.0x 25.8x
Cash ratio 14.4x 0.6x 25.6x
Altman Z-score – – –

Shareholder Returns

7 metrics
MetricGMTLRIOIONR
Dividend yield – 5.6% –
Net buyback yield – – –
Shareholder yield – 5.6% –
Payout ratio (earnings) – – –
Payout ratio (FCF) – – –
Dividend growth (1Y) – – –
Dividend CAGR (3Y) – – –

Analyst Estimates

Solid lines are reported fiscal-year results; dashed lines are the consensus for the years ahead. Hover a year for the analysts' high and low, and how each result compared with its estimate.

ConsensusGMTLRIOIONR
Forward P/E – 10.6xFY2026 –
EPS, next fiscal year $-0.25FY2027 $7.84FY2026 $0.00FY2026
EPS growth, next FY – +17.2%FY2026 –
EPS growth, the year after – +9.1% –
Revenue, next fiscal year $0.00FY2027 $67.58BFY2026 $717.29KFY2026
Revenue growth, next FY – +17.2%FY2026 +9.8%FY2026
Revenue growth, the year after – -8.0% -100.0%

Institutional Ownership

13F filings, quarter ended Jun 30, 2026
HoldersGMTLRIOIONR
Held by institutions 10.6% 7.9% 3.9%
Institutions holding 47 969 34
Change in shares held, QoQ +16.7% -1.1% -10.1%
Institutions buying 36 505 20
Institutions selling 10 283 5
Buyers to sellers 3.60 1.78 4.00

Return Correlation

Daily returns, last 12 months

1.00 means two stocks move in lockstep, 0 that they move independently. Pairs below about 0.5 diversify each other.

GMTLRIOIONR
GMTL 1.00 0.33 0.16
RIO 0.33 1.00 0.41
IONR 0.16 0.41 1.00

Add a Peer

Largest companies in the same industry

Related Comparisons

Frequently Asked Questions

Which is bigger, GMTL, RIO and IONR?

Rio Tinto (RIO) is the largest by market capitalisation: Guardian Metal Resources (GMTL) $314.97M, Rio Tinto (RIO) $135.12B, Ioneer (IONR) $188.56M.

Which stock has performed better?

Over the past year Rio Tinto (RIO) returned the most: Rio Tinto (RIO) +14.7%, Ioneer (IONR) -41.5%. Returns are price only, before dividends.

Which pays a higher dividend?

Only one of these companies pays a dividend: Rio Tinto (RIO) 5.59%. Guardian Metal Resources (GMTL) and Ioneer (IONR) pays no regular dividend.

Which stock is riskier?

By one-year price volatility, Rio Tinto (RIO) has been the steadiest (Guardian Metal Resources (GMTL) 92.5%, Rio Tinto (RIO) 30.9%, Ioneer (IONR) 79.3%). Volatility measures how widely the price swings, not the risk of the business.

Which is the better stock, GMTL, RIO and IONR?

There is no single answer; it depends on what you are buying for. On the 12 head-to-head measures on this page, Rio Tinto (RIO) leads on 3. Business Quant does not give investment advice; use the comparison as a starting point for your own research.

Data from SEC filings, exchange prices and consensus estimates, via Business Quant. Percentile scores compare each company with its own peer group, so two companies' scores are each relative to different peers unless you rank against the whole market. Price returns exclude dividends. Nothing on this page is investment advice.