Robert J. Kostelnik serves as Executive at FRONTIER OIL CORP /NEW/, where they oversee executive responsibilities. Since joining the company, Robert J. Kostelnik has executed 20 insider transactions totaling $92.4K, demonstrating a bearish approach to their equity position. Their most recent transaction on Nov 12, 2025 involved receiving (via award) 2,943 shares valued at $0.
Robert J. Kostelnik currently holds 59,598 shares of FRONTIER OIL CORP /NEW/ (FTO), valued at approximately $0. This represents their equity stake as Executive.
Based on SEC Form 4 filings, Robert J. Kostelnik has been a net seller of FTO stock. They have purchased $0 and sold $92.4K worth of shares.
Robert J. Kostelnik's most recent insider trade was on Nov 12, 2025, when they sold 2,943 shares at $0.00 per share.
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| $N/A |
| Discretionary |
| Nov 9, 2022 | DINO | $0 | Award | 2,643 | $N/A | Discretionary |
| Nov 10, 2021 | HFC | $0 | Award | 4,180 | $N/A | Discretionary |
| Nov 11, 2020 | HFC | $0 | Award | 6,573 | $N/A | Discretionary |
| Nov 13, 2019 | HFC | $0 | Award | 2,663 | $N/A | Discretionary |
| Dec 3, 2018 | HFC | $49.5K | Sale | 811 | $61.05 | Discretionary |
| Nov 30, 2018 | HFC | $42.9K | Sale | 689 | $62.29 | Discretionary |
| Nov 7, 2018 | HFC | $0 | Award | 1,982 | $N/A | Discretionary |
| Nov 8, 2017 | HFC | $0 | Award | 3,190 | $N/A | Discretionary |
| Nov 9, 2016 | HFC | $0 | Award | 5,149 | $N/A | Discretionary |
| Nov 11, 2015 | HFC | $0 | Award | 2,730 | $N/A | Discretionary |
| Nov 12, 2014 | HFC | $0 | Award | 3,079 | $N/A | Discretionary |
| Nov 13, 2013 | HFC | $0 | Award | 3,009 | $N/A | Discretionary |
| Jan 23, 2013 | HFC | $0 | Award | 2,950 | $N/A | Discretionary |
| Jan 25, 2012 | HFC | $0 | Award | 4,600 | $N/A | Discretionary |
| Aug 25, 2011 | HFC | $0 | Award | 919 | $N/A | Discretionary |
| Jul 1, 2011 | FTO | $228.1K | Disposition | 7,060 | $32.31 | Discretionary |
| Jul 1, 2011 | HFC | $0 | Award | 3,396 | $N/A | Discretionary |
| Jan 25, 2011 | FTO | $125.1K | Award | 7,060 | $17.72 | Discretionary |