GMTL vs MTRN vs RIO Stock Comparison

Guardian Metal Resources, Materion and Rio Tinto Prices as of Oct 23, 2026 Peers: Industry group
MTRN MATERION Corp
$220.82 -13.6% 1M +67.3% 1Y
Market cap
$4.72B
P/E
52.4x
Revenue (TTM)
$2.10B
Div. yield
0.00%
Industrial Minerals Basic Materials
2 wins
RIO Rio Tinto Plc
$83.40 -12.4% 1M +18.1% 1Y
Market cap
$135.87B
P/E
–
Revenue (TTM)
—
Div. yield
–
Iron Ore Basic Materials
3 wins

Head to Head

5 decided of 12

Rio Tinto leads on 3 of the 12 questions below (Rio Tinto 3, Materion 2). Which ones matter depends on what you are buying for; a cheap multiple and slow growth often come together.

QuestionGMTLMTRNRIOLeader
Larger companyMarket capitalisation $307.75M $4.72B $135.87B RIO
Cheaper on earningsLower P/E, profitable companies only -29.9x 52.4x — –
Cheaper on forward earningsLower price / next fiscal year consensus EPS — 29.7x 10.6x RIO
Faster revenue growthRevenue growth, trailing twelve months — +21.6% — –
More profitableNet margin, trailing twelve months — 4.3% — –
Better return on capitalReturn on invested capital — 8.1% — –
Less leveragedLower net debt / EBITDA — 2.1x — –
Higher dividend yieldTrailing dividend yield 0.00% 0.00% 0.00% –
Better 1-year returnPrice return, last 12 months — +67.3% +18.1% MTRN
Better 5-year returnAnnualised price return, 5 years — +25.5%/yr +4.8%/yr MTRN
Less volatileAnnualised volatility, 1 year 91.4% 61.6% 30.7% RIO
Higher overall scoreMean of the five percentile scores vs peers — 49/100 — –

Percentile Scorecard

GMTLMTRNRIO

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

AxisGMTLMTRNRIO
Valuation 29 #115 of 162 55 #73 of 162 –
Growth – 53 #70 of 147 –
Profitability – 55 #55 of 122 –
Financial Health 95 #9 of 166 27 #121 of 166 22 #129 of 166
Shareholder Returns – 53 #51 of 107 98 #3 of 107
Overall – 49 –
  • GMTL ranked among 176 companies in Metals and Mining
  • MTRN ranked among 176 companies in Metals and Mining
  • RIO 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

PeriodGMTLMTRNRIOSPY
1 month -51.9%-13.6%-12.4% -1.0%
3 months -52.8%-8.5%-8.6% +2.9%
6 months -71.8%+18.8%-16.3% +6.4%
Year to date —+77.6%+4.2% +11.4%
1 year —+67.3%+18.1% +13.1%
3 years —+132.0%+33.6% +79.4%
3 years, per year —+32.4%+10.1% +21.5%
5 years —+211.0%+26.6% +67.7%
5 years, per year —+25.5%+4.8% +10.9%
10 years —+651.1%+153.7% +255.2%
10 years, per year —+22.3%+9.8% +13.5%

Risk

MeasureGMTLMTRNRIOSPY
Volatility, 1Y 91.4%61.6%30.7% 12.7%
Downside volatility, 1Y 91.7%63.2%32.0% 12.7%
Beta vs S&P 500, 1Y 2.282.121.26 1.00
Return / volatility, 1Y —1.090.59 1.03
Max drawdown, 5Y -76.4%-48.1%-39.0% -25.4%
From 52-week high -74.9%-31.0%-25.6% -2.5%
52-week high $20.64$320.08$112.04 $779.14
52-week low $4.88$111.50$67.89 $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.

MultipleGMTLMTRNRIO
P/E now vs peer median -29.9xmedian 12.7x 51.0xmedian 12.7x —median 12.7x
P/S now vs peer median —median 3.1x 2.2xmedian 3.1x —median 3.1x
EV/EBITDA now vs peer median —median 6.9x 25.2xmedian 6.9x —median 6.9x
P/FCF now vs peer median -49.8xmedian 15.1x 78.3xmedian 15.1x —median 15.1x
P/B now vs peer median 3.2xmedian 2.1x 4.6xmedian 2.1x 2.0xmedian 2.1x
PEG now vs peer median —median 0.27 -16.15median 0.27 —median 0.27

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 monthsGMTLMTRNRIO
Revenue – $2.10B –
Gross profit – $335.97M –
Operating income – $125.67M –
Net income – $90.12M –
Free cash flow – $58.73M –
R&D – $25.74M –
EPS (diluted) – $4.28 –
Cash & equivalents $52.46M $19.99M $8.87B
Total debt – $440.69M $16.90B
Shares (diluted) 57.79M 21.08M 1.63B
Enterprise value $307.75M $4.66B $96.37B

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
MetricGMTLMTRNRIO
P/E -29.9x 51.0x –
P/FCF -49.8x 78.3x –
P/Operating cash flow – 42.5x –
P/S – 2.2x –
P/B 3.2x 4.6x 2.0x
P/Tangible book 5.7x 5.1x 2.2x
EV/EBITDA – 25.2x –
EV/EBIT – 40.0x –
EV/Revenue – 2.4x –
EV/FCF – 85.5x –
EV/Operating cash flow – 46.4x –
PEG (3Y EPS CAGR) – -16.15 –

Growth

14 metrics
MetricGMTLMTRNRIO
Revenue growth (1Y) – 21.6% –
Revenue CAGR (3Y) – 7.2% –
Gross profit growth (1Y) – 1.0% –
Gross profit CAGR (3Y) – -2.4% –
Operating income growth (1Y) – 120.8% –
Operating income CAGR (3Y) – -3.7% –
Net income growth (1Y) – 453.5% –
Net income CAGR (3Y) – -2.9% –
EPS growth (1Y) – 447.1% –
EPS CAGR (3Y) – -3.2% –
Operating cash flow growth (1Y) – -26.2% –
Operating cash flow CAGR (3Y) – -13.1% –
Free cash flow growth (1Y) – -36.0% –
Free cash flow CAGR (3Y) – -1.8% –

Profitability

14 metrics
MetricGMTLMTRNRIO
Gross margin – 16.0% –
EBITDA margin – 9.5% –
Operating margin – 6.0% –
Pretax margin – 4.6% –
Net margin – 4.3% –
FCF margin – 2.8% –
Operating cash flow margin – 5.2% –
Return on equity – 9.2% –
Return on assets – 4.8% –
Return on invested capital – 8.1% –
Return on capital employed – 8.0% –
Asset turnover – 1.1x –
Cash conversion (OCF / net income) – 1.2x –
Stock comp / revenue – 0.7% –

Financial Health

11 metrics
MetricGMTLMTRNRIO
Debt / assets – 23.6% –
Debt / equity – 0.4x 0.3x
Net debt / EBITDA – 2.1x –
Debt / FCF – 7.5x –
Liabilities / assets 3.7% 46.8% –
Equity / assets 96.3% 53.2% –
Interest coverage – 4.1x –
Current ratio 15.3x 2.9x 1.4x
Quick ratio 14.8x 1.1x 1.0x
Cash ratio 14.4x 0.1x 0.6x
Altman Z-score – 5.59 –

Shareholder Returns

7 metrics
MetricGMTLMTRNRIO
Dividend yield – 0.3% 5.6%
Net buyback yield – – –
Shareholder yield – 0.3% 5.6%
Payout ratio (earnings) – 13.0% –
Payout ratio (FCF) – 20.0% –
Dividend growth (1Y) – 3.8% –
Dividend CAGR (3Y) – 4.4% –

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.

ConsensusGMTLMTRNRIO
Forward P/E – 29.7xFY2026 10.6xFY2026
EPS, next fiscal year $-0.25FY2027 $7.43FY2026 $7.86FY2026
EPS growth, next FY – +36.6%FY2026 +17.5%FY2026
EPS growth, the year after – +18.8% +8.8%
Revenue, next fiscal year $0.00FY2027 $2.50BFY2026 $67.63BFY2026
Revenue growth, next FY – +39.7%FY2026 +17.3%FY2026
Revenue growth, the year after – +8.4% -7.9%

Institutional Ownership

13F filings, quarter ended Jun 30, 2026
HoldersGMTLMTRNRIO
Held by institutions 10.6% 97.0% 7.9%
Institutions holding 47 404 968
Change in shares held, QoQ +16.7% +3.3% -1.1%
Institutions buying 36 238 504
Institutions selling 10 121 283
Buyers to sellers 3.60 1.97 1.78

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.

GMTLMTRNRIO
GMTL 1.00 0.40 0.37
MTRN 0.40 1.00 0.42
RIO 0.37 0.42 1.00

Add a Peer

Largest companies in the same industry

Related Comparisons

Frequently Asked Questions

Which is bigger, GMTL, MTRN and RIO?

Rio Tinto (RIO) is the largest by market capitalisation: Guardian Metal Resources (GMTL) $307.75M, Materion (MTRN) $4.72B, Rio Tinto (RIO) $135.87B.

Which stock has performed better?

Over the past year Materion (MTRN) returned the most: Materion (MTRN) +67.3%, Rio Tinto (RIO) +18.1%. Over five years, Materion (MTRN) compounded fastest (Materion (MTRN) +25.5%/yr, Rio Tinto (RIO) +4.8%/yr). Returns are price only, before dividends.

Which pays a higher dividend?

Only one of these companies pays a dividend: Guardian Metal Resources (GMTL) 0.00%, Materion (MTRN) 0.00%, Rio Tinto (RIO) 0.00%. Guardian Metal Resources (GMTL) and Rio Tinto (RIO) pays no regular dividend.

Which stock is riskier?

By one-year price volatility, Rio Tinto (RIO) has been the steadiest (Guardian Metal Resources (GMTL) 91.4%, Materion (MTRN) 61.6%, Rio Tinto (RIO) 30.7%). Volatility measures how widely the price swings, not the risk of the business.

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

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.