Figures computed from official regulatory filings — .
Ownershipinsiders 0% · institutions 0.01% · short 1.4% of float
In USD · as of Oct 5, 2026
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Rubicon Technology, Inc. provides monocrystalline sapphire for applications in optical and industrial systems in North America, Asia, and internationally. The company offers optical and industrial sapphire products in various shapes and sizes, including sheets, rods, tubes, core, ingots, and prisms for a range of end markets comprising defense and aerospace, specialty lighting, instrumentation, sensors and detectors, semiconductor process equipment, electronic substrates, medical, and laser applications. It serves defense subcontractors, industrial manufacturers, fabricators, and resellers. The company was incorporated in 2001 and is based in Bensenville, Illinois.
Market information source · Oct 5, 2026
SEC company identity · Oct 5, 2026
Open-market timeline · full history
7 buys39 sells— close pricebar = usd volume, √ scaleclick a period to filter the table
| Insider | Type | Value · USD | Signals | Details | |
|---|---|---|---|---|---|
| Brog Timothy Etrack record | Sell | $79.5K | SEC | ||
| Bandera Partners LLCtrack record |
| Sell |
| $61.2K |
| SEC |
| Bandera Partners LLCtrack record | Sell | $2.6M | SEC |
| Brog Timothy Etrack record | Sell | $1.2M | SEC |
| MIKOLAJCZYK MICHAEL Etrack record | Sell | $637K | Unusual size | SEC |
| Westphal Susan | Sell | $89.4K | SEC |
| Gramm Jeffersontrack record | Award | n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise)) | SEC |
| MIKOLAJCZYK MICHAEL Etrack record | Award | n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise)) | SEC |
| Westphal Susan | Award | n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise)) | SEC |
| Brog Timothy Etrack record | Other | $101.9K | SEC |
| Brog Timothy Etrack record | Exercise | n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise)) | SEC |
| Brog Timothy Etrack record | Other | $100.5K | SEC |
| Brog Timothy Etrack record | Exercise | n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise)) | SEC |
| Brog Timothy Etrack record | AwardD (derivative) | n/a (No price was disclosed in the filing) | SEC |
| MIKOLAJCZYK MICHAEL Etrack record | AwardD (derivative) | $10K | SEC |
| Gramm Jeffersontrack record | AwardD (derivative) | $10K | SEC |
| Westphal Susan | Award | n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise)) | SEC |
| Gramm Jeffersontrack record | Award | n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise)) | SEC |
| MIKOLAJCZYK MICHAEL Etrack record | Award | n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise)) | SEC |
| Westphal Susan | AwardD (derivative) | $10K | SEC |
| Brog Timothy Etrack record | Award | n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise)) | SEC |
| Brog Timothy Etrack record | Other | $161.6K | SEC |
| Brog Timothy Etrack record | Exercise | n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise)) | SEC |
| Brog Timothy Etrack record | Other | $44.9K | SEC |
| Westphal Susan | Award | n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise)) | SEC |