InsidersTradesSigma
Total declarations
Companies
▲ Purchases (4 ops.)
▼ Sales (2 ops.)
Insider track record
Board DirectorDisclosed buys
4
Disclosed sells
2
T+90 hit rate
100%
T+90 mean return
+6.5%
Across 2 buy signals with a settled T+90 return. Return basis: close on the day after publication.
Signal history
Discover the full record of transactions filed by Gramm Jefferson, Director. Insider active across 2 companies, notably Rubicon Technology, Inc.. In total, 9 filings have been published. Breakdown: 4 buys · 2 sells. Total volume traded: €5.9m. History available since 23 June 2021. The latest transaction was disclosed on 4 December 2024 (Acquisition). Regulator: SEC (Form 4). All data is openly available.
Declarations9 total
1,250,000 shares@ US$1.6057.6% of flowCommon Stock, par value $0.0001 per shareSEC:0000921895-24-002897:0
Ideal exit: 31 Aug 2025 (T+270)
350,000 shares@ US$1.2011.7% of flowCommon Stock, par value $0.0001 per shareSEC:0000921895-24-001619:0
Ideal exit: 17 Apr 2025 (T+270)
850,000 shares@ US$1.2028.2% of flowCommon Stock, par value $0.0001 per shareSEC:0000921895-24-001607:0
Ideal exit: 13 Apr 2025 (T+270)
360,000 shares@ US$0.252.5% of flowCommon Stock, par value $0.0001 per shareSEC:0000921895-23-000406:0
Ideal exit: 5 Nov 2023 (T+270)
3,059 shares@ US$20.002.3% of flowCommon Stock, $0.001 Par Value Per ShareSEC:0000921895-22-002519:0
129,933 shares@ US$20.0097.7% of flowCommon Stock, $0.001 Par Value Per ShareSEC:0000921895-22-002519:1
1,010 shares0Common StockSEC:0001213900-22-043432:0
1,250 shares0Common StockSEC:0001213900-21-034537
1,250 shares0Common StockSEC:0001213900-21-034537:0
9 of 9 declarations
About Gramm Jefferson
Jefferson Gramm is a Board Member at Rubicon Technology, Inc. He plays a key role in the governance of the company, contributing to strategic decision-making.
