NASDAQ:RBCN

Rubicon Technology Stock Insider Trading

Technology > Semiconductors

Buy RBCN

*Your capital is at risk

$5.80

+0.200 (+3.57%)

At Close: Jun 03, 2026

Rubicon Technology Stock Insider Power

Based on the 100 latest insides trades, we have calculated the insider power to be negative at 0. In total, the insiders bought 398.92K and sold 953.85K RBCN shares in the last 100 trades. The insider score can be negative despite buy/sell ratio being positive. The score focuses on the quality of the trades.

Insider Power (Last 100 transactions)	0
● Buy	398.92K shares
● Sell	953.85K shares
74% Buy Activity Negligible or No Correlation
No Significant Signals No statistically significant buy or sell signals detected in recent insider data.

Historical Insider Trades

Date	Type	Person	Role	Amount
Feb 22, 2023 Sell	Common Stock S-Sale	Brog Timothy Director	Director	52 624 Value: $79.5K
Feb 22, 2023 Sell	Common Stock S-Sale	Brog Timothy Director	Director	52 624 Value: $79.5K
Aug 19, 2022 Buy	Common Stock	Eidinger John Director	Director	0 Value: $0
Aug 19, 2022 Buy	Common Stock	Seirer Darren Clay	Director	0 Value: $0
Aug 19, 2022 Buy	Common Stock	Seirer Darren Clay	Director	0 Value: $0
Aug 19, 2022 Buy	Common Stock	Eidinger John Director	Director	0 Value: $0
Aug 19, 2022 Buy	Common Stock, par value $0.001 per share	Janel Corp 10 Percent Owner	10% Owner	0 Value: $0
Aug 19, 2022 Buy	Common Stock, par value $0.001 per share	Janel Corp 10 Percent Owner	10% Owner	0 Value: $0
Aug 19, 2022 Sell	Common Stock, $0.001 Par Value Per Share S-Sale	Bylinsky Gregory	Director	129 933 Value: $2.60M
Aug 19, 2022 Sell	Common Stock, $0.001 Par Value Per Share S-Sale	Gramm Jefferson See Footnote 1	Director	129 933 Value: $2.60M
Aug 19, 2022 Sell	Common Stock, $0.001 Par Value Per Share S-Sale	Gramm Jefferson See Footnote 1	Director	3 059 Value: $61.2K
Aug 19, 2022 Sell	Common Stock, $0.001 Par Value Per Share S-Sale	Gramm Jefferson See Footnote 1	Director	3 059 Value: $61.2K
Aug 19, 2022 Sell	Common Stock, $0.001 Par Value Per Share S-Sale	Gramm Jefferson See Footnote 1	Director	129 933 Value: $2.60M
Aug 19, 2022 Sell	Common Stock, $0.001 Par Value Per Share S-Sale	Bylinsky Gregory	Director	129 933 Value: $2.60M
Aug 19, 2022 Sell	Common Stock S-Sale	Brog Timothy Chief Executive Officer	CEO / President	58 315 Value: $1.17M
Aug 19, 2022 Sell	Common Stock S-Sale	Mikolajczyk Michael E	Director	31 851 Value: $637.0K
Aug 19, 2022 Sell	Common Stock S-Sale	Westphal Susan	Director	4 472 Value: $89.4K
Aug 19, 2022 Sell	Common Stock S-Sale	Westphal Susan	Director	4 472 Value: $89.4K
Aug 19, 2022 Sell	Common Stock S-Sale	Mikolajczyk Michael E	Director	31 851 Value: $637.0K
Aug 19, 2022 Sell	Common Stock S-Sale	Brog Timothy Chief Executive Officer	CEO / President	58 315 Value: $1.17M
Jul 29, 2022 Buy	Common Stock A-Award	Gramm Jefferson	Director	1 010 Value: $0
Jul 29, 2022 Buy	Common Stock A-Award	Mikolajczyk Michael E	Director	1 010 Value: $0
Jul 29, 2022 Buy	Common Stock A-Award	Westphal Susan Director	Director	1 010 Value: $0
Jul 29, 2022 Buy	Common Stock A-Award	Westphal Susan Director	Director	1 010 Value: $0
Jul 29, 2022 Buy	Common Stock A-Award	Mikolajczyk Michael E	Director	1 010 Value: $0

About Insider Power

Insider Power is a proprietary algorithm developed by StockInvest.us to evaluate the significance of insider transactions. The calculation considers the size, type, and timing of transactions, as well as the insider’s role within the company.

It is important to note that, in general, there is little to no correlation between insider transactions and short-term stock price movements. In one of our studies, only 0.22%^* of stocks with insider activity showed a measurable correlation — and even then, it was unclear whether the effect was caused by insider actions or simply by the stock’s broader trend.

While our algorithms are designed to highlight potentially meaningful signals, these cannot be regarded as statistically significant on their own. Insider trading activity should therefore be seen as informative rather than as direct trading guidance. The Insider Power metric was created to present this information in a clearer and more accessible way, helping investors better understand the possible context of insider activity.

* October 6th, 2025 - Tested on 5562 stocks

ABOUT RUBICON TECHNOLOGY

Rubicon Technology, Inc. provides monocrystalline sapphire for applications in optical and industrial systems in North America and Asia. The company offers optical and industrial sapphire products in various shapes and sizes, including round and rectangular windows and wafers, domes, tubes, and rods for a range of end markets comprising defense and aerospace, specialty lighting, instrumentation, sensors and detectors, semiconductor process equipm...

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