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Video: Compound Annual Growth Rate (CAGR) Definition
RBCN Historical Price Range
Date Open High Low Close Volume
05/04/2026 $3.80 $3.80 $3.80 $3.80 0
05/05/2026 $3.80 $3.80 $3.80 $3.80 0
05/06/2026 $4.00 $4.00 $4.00 $4.00 7.30K
05/07/2026 $4.00 $4.00 $3.95 $4.00 6.10K
05/08/2026 $3.90 $4.00 $3.90 $4.00 4.50K
About RBCN
Rubicon Technology is operating through its subsidiary, Rubicon Technology Worldwide LLC (RTW). RTW is a materials provider specializing in monocrystalline sapphire for applications in optical and industrial systems. Co. provides optical and industrial sapphire products in various shapes and sizes, including round and rectangular windows and blanks, domes, tubes and rods. These optical sapphire products are used in equipment for a variety of end markets and applications, including defense and aerospace, specialty lighting, instrumentation, sensors and detectors, semiconductor process equipment, electronic substrates, medical and laser applications.
RBCN historical stock prices picture
RBCN (RBCN) has the following price history information. Looking back at RBCN historical stock prices for the last five trading days, on May 04, 2026, RBCN opened at $3.80, traded as high as $3.80 and as low as $3.80, and closed at $3.80. Trading volume was a total of 0 shares. On May 05, 2026, RBCN opened at $3.80, traded as high as $3.80 and as low as $3.80, and closed at $3.80. Trading volume was a total of 0 shares. On May 06, 2026, RBCN opened at $4.00, traded as high as $4.00 and as low as $4.00, and closed at $4.00. Trading volume was a total of 7.30K shares. On May 07, 2026, RBCN opened at $4.00, traded as high as $4.00 and as low as $3.95, and closed at $4.00. Trading volume was a total of 6.10K shares. On May 08, 2026, RBCN opened at $3.90, traded as high as $4.00 and as low as $3.90, and closed at $4.00. Trading volume was a total of 4.50K shares.

RBCN Historical Stock Prices By Date:

RBCN historical cagr picture

Below, we examine the compound annual growth rate — CAGR for short — of an investment into RBCN shares, starting with a $10,000 purchase of RBCN, and working forward through the historical stock price information to today.

Growth of $10,000.00
Without Dividends Reinvested
Start date: 08/17/2022
End date: 05/08/2026
Start price/share: $5.01
End price/share: $4.00
Dividends collected/share: $0.00
Total return: -20.16%
Average Annual Total Return: -5.86%
Starting investment: $10,000.00
Ending investment: $7,985.13
Years: 3.73
RBCN Historical Closing Prices
Date Close
05/04/2026$3.80
05/05/2026$3.80
05/06/2026$4.00
05/07/2026$4.00
05/08/2026$4.00
Technology Historical Prices
RBCN is categorized under the Technology sector; below are some other companies in the same sector:

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Also explore: RBCN shares outstanding history

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