Robert J. Kostelnik

Director, FRONTIER OIL CORP /NEW/.

Companies

HF SinclairBoard member Nov 9, 2022 to now¹
HollyFrontier CorpBoard member Jul 1, 2011 to Nov 10, 2021²

Holdings

Stock this person has reported owning, from the forms officers and directors file with the SEC. See the biggest insider stakes.

Shares held

HF Sinclair DINO59,598 shares³$7.5M at $125.54Nov 12, 2025
HollyFrontier Corp47,235 shares⁴Nov 10, 2021

As of each latest filing. The line shows shares held over time.

Recent filings

Nov 12, 2025Granted 2,943 shares of HF Sinclair³
Nov 13, 2024Granted 3,772 shares of HF Sinclair⁵
Nov 8, 2023Granted 3,005 shares of HF Sinclair⁶
Nov 9, 2022Granted 2,643 shares of HF Sinclair⁷
Nov 10, 2021Granted 4,180 shares of HollyFrontier Corp⁴

Sources

The numbers on this page point here. Each one links to the record it came from.

1
SEC EDGARHF Sinclair, Board member
2
SEC EDGARHollyFrontier Corp, Board member
3
SEC EDGARHF Sinclair shares after the filing of Nov 12, 2025
4
SEC EDGARHollyFrontier Corp shares after the filing of Nov 10, 2021
5
SEC EDGARForm 4 filed Nov 14, 2024
6
SEC EDGARForm 4 filed Nov 9, 2023
7
SEC EDGARForm 4 filed Nov 9, 2022