Stephen P. Mawer

Companies

• Calumet LubricantsBoard member Nov 12, 2024 to now¹
• Calumet Specialty Products Partners, L.P.Board member Mar 17, 2016 to Jan 22, 2024²
• Calumet Specialty Products Partners, L.P.Chair Aug 12, 2022 to Nov 22, 2022³
• Calumet Specialty Products Partners, L.P.Chief executive officer Feb 25, 2021 to Mar 8, 2022⁴

Holdings

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

Shares held

• CLCalumet Lubricants CLMT348,410 shares⁵$20.1M at $57.75Sep 25, 2026
• CSCalumet Specialty Products Partners, L.P.172,610 shares⁶Jan 18, 2024

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

Recent filings

• Sep 25, 2026Sold 24,555 shares of Calumet Lubricants⁵
• Sep 25, 2026Exercised options 61,387 shares of Calumet Lubricants⁵
• Jul 9, 2026Shares withheld for tax 5,512 shares of Calumet Lubricants⁷
• Jul 9, 2026Exercised options 13,780 shares of Calumet Lubricants⁷
• Mar 9, 2026Shares withheld for tax 12,589 shares of Calumet Lubricants⁸
• Mar 9, 2026Exercised options 27,806 shares of Calumet Lubricants⁸
• Jun 24, 2025Sold 2,962 shares of Calumet Lubricants⁹
• Jun 24, 2025Exercised options 7,403 shares of Calumet Lubricants⁹
• Apr 22, 2025Sold 3,655 shares at $9.29 of Calumet Lubricants¹⁰
• Mar 24, 2025Sold 3,655 shares at $12.88 of Calumet Lubricants¹¹
• Mar 11, 2025Shares withheld for tax 75,873 shares of Calumet Lubricants¹²
• Mar 11, 2025Exercised options 169,937 shares of Calumet Lubricants¹²
• Mar 6, 2025Sold 3,655 shares at $12.64 of Calumet Lubricants¹³
• Jan 17, 2025Sold 18,629 shares of Calumet Lubricants¹⁴
• Jan 17, 2025Exercised options 46,572 shares of Calumet Lubricants¹⁴
• Jan 18, 2024Sold 15,037 shares at $17.87 of Calumet Specialty Products Partners, L.P.⁶
• Jan 18, 2024Shares withheld for tax 30,717 shares of Calumet Specialty Products Partners, L.P.⁶
• Jan 18, 2024Exercised options 68,310 shares of Calumet Specialty Products Partners, L.P.⁶
• Nov 21, 2022Bought 3,500 shares at $16.27 of Calumet Specialty Products Partners, L.P.¹⁵
• Aug 22, 2022Bought 1,000 shares at $16.35 of Calumet Specialty Products Partners, L.P.¹⁶
• Aug 22, 2022Bought 1,000 shares at $16.32 of Calumet Specialty Products Partners, L.P.¹⁶
• Aug 22, 2022Bought 1,000 shares at $16.38 of Calumet Specialty Products Partners, L.P.¹⁶
• Aug 22, 2022Bought 2,000 shares at $16.42 of Calumet Specialty Products Partners, L.P.¹⁶
• Aug 16, 2022Bought 2,321 shares at $16.16 of Calumet Specialty Products Partners, L.P.¹⁷
• Aug 16, 2022Bought 2,000 shares at $16.18 of Calumet Specialty Products Partners, L.P.¹⁷