The company has issued more shares over this period, which dilutes each existing shareholder’s stake.
Diluted shares outstanding: 2.4M (2021) → 3.9M (2025)
Rubicon Technology, Inc. produces monocrystalline sapphire for a broad spectrum of optical and industrial applications, serving clients across North America, Asia, and other international markets. The company provides a range of optical and industrial-grade sapphire materials in various forms and dimensions, including sheets, rods, tubes, cores, ingots, and prisms. These offerings cater to diverse industries such as defense and aerospace, specialized lighting, scientific instrumentation, sensing and detection technologies, semiconductor fabrication equipment, electronic substrates, medical devices, and laser systems. Rubicon Technology's clientele encompasses defense subcontractors, industrial manufacturers, material fabricators, and resellers. Established in 2001, the company's operations are based in Bensenville, Illinois.
When traditional metrics don't capture the full picture, these are the signals growth stock investors use instead.
>+1,000% YoY
YoY Growth Rate
Revenue accelerating
+950.0% YoY
YoY Growth Rate
EPS growth accelerating
$0/ year
0.0% of revenue
Below sector average (3%)
Research and development spending
Cash flow positive
$45M cash & investments
Company generates more cash than it spends — no dilution risk from fundraising
Rubicon Technology grew revenue 28163% year-over-year and the growth rate is speeding up. That's the kind of momentum growth investors look for — the question is whether margins can follow.
The Winston Score above measures business quality today. Growth stocks often score lower because they invest in the future rather than maximising current profits. These metrics show what matters most for evaluating that future.
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ROIC above 25%. Every dollar invested in the business earns more than 25 cents back per year.
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FCF margin between 10% and 20%. Every $100 in sales becomes $10 to $20 in real cash.
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Interest coverage above 8. Profits cover interest many times over.
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P/E under 10. The price tag is small relative to last year's profit.
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Yield above 6% — often a flag the market is pricing in a cut.
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