Frank Semple

Companies

• Marathon PetroleumBoard member 2021 to now⁶
• MPLXBoard member Dec 7, 2015 to now⁷
• Hyliion Holdings Corp.Board member Feb 27, 2019 to Oct 5, 2020⁸
• MPLXVice chair Dec 7, 2015 to Dec 8, 2015⁷

Holdings

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

Shares held

• Marathon Petroleum MPC14,720 shares⁹$7.0M at $473.55Apr 30, 2026
• MMPLX MPLX112,253 shares¹⁰$6.6M at $58.52Aug 18, 2026

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

Recent filings

• Aug 14, 2026Granted 1,073 shares of MPLX¹⁰
• May 15, 2026Granted 1,194 shares of MPLX¹¹
• Apr 30, 2026Granted 728 shares of Marathon Petroleum⁹
• Apr 30, 2026Granted 2,580 shares of MPLX¹²
• Apr 30, 2026Granted 3,029 shares of MPLX¹³
• Feb 17, 2026Granted 1,072 shares of MPLX¹⁴
• Nov 14, 2025Granted 1,132 shares of MPLX¹⁵
• Aug 15, 2025Granted 1,051 shares of MPLX¹⁶
• May 16, 2025Granted 990 shares of MPLX¹⁷
• May 1, 2025Granted 1,276 shares of Marathon Petroleum¹⁸
• May 1, 2025Granted 2,848 shares of MPLX¹⁹
• Apr 1, 2025Granted 94 shares of Marathon Petroleum²⁰
• Apr 1, 2025Granted 220 shares of MPLX²¹
• Feb 14, 2025Granted 888 shares of MPLX²²
• Jan 2, 2025Granted 294 shares of Marathon Petroleum²³
• Jan 2, 2025Granted 738 shares of MPLX²⁴
• Nov 15, 2024Granted 982 shares of MPLX²⁵
• Oct 1, 2024Granted 251 shares of Marathon Petroleum²⁶
• Oct 1, 2024Granted 803 shares of MPLX²⁷
• Aug 16, 2024Granted 933 shares of MPLX²⁸
• Jul 1, 2024Granted 225 shares of Marathon Petroleum²⁹
• Jul 1, 2024Granted 831 shares of MPLX³⁰
• May 13, 2024Granted 924 shares of MPLX³¹
• Apr 1, 2024Granted 193 shares of Marathon Petroleum³²
• Apr 1, 2024Granted 862 shares of MPLX³³