George P. Shaffner

Insider

First SEC filing: March 2, 2012 · Latest: March 2, 2012

On this page

Insider at Companies where this person is a reporting insider.
Insider transactions Every share this person bought or sold, from Form 4 filings.
Derivatives Options and other derivative holdings reported by this person.

Insider at

Insider transactions

0 buys (P) 0 sells (S) Net: $0 + 56 non-open-market transactions below last 12 months, based on the transactions shown below

Price change vs current quote, split-adjusted for corporate actions since the filing — not benchmarked, not annualized, not size-weighted

56 other filings hidden

Date	Ticker	Code	Shares	Price	Value	Owned after	Δ own	A/D	vs now
May 6, 2015	MPC	M	4,436	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-20)
May 6, 2015	MPC	M	21,125	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-20)
May 6, 2015	MPC	S	4,436	$100.76	$446,971	14,282 Direct	-23.70%	Disposed	623.4% (price as of 2026-08-20)
May 6, 2015	MPC	S	21,125	$100.45	$2,122,006	18,718 Direct	-53.02%	Disposed	625.6% (price as of 2026-08-20)
May 6, 2015	MPC	M	4,436	$34.40	$152,598	39,843 Direct	+12.53%	Acquired	2018.8% (price as of 2026-08-20)
May 6, 2015	MPC	M	21,125	$41.69	$880,701	35,407 Direct	+147.91%	Acquired	1648.3% (price as of 2026-08-20)
May 4, 2015	MPC	M	17,297	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-20)
May 4, 2015	MPC	M	3,490	—	—	17,297 Direct	-16.79%	Disposed	(price as of 2026-08-20)
May 4, 2015	MPC	M	5,426	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-20)
May 4, 2015	MPC	S	5,426	$101.50	$550,739	14,282 Direct	-27.53%	Disposed	618.1% (price as of 2026-08-20)
May 4, 2015	MPC	S	17,297	$101.43	$1,754,435	19,708 Direct	-46.74%	Disposed	618.6% (price as of 2026-08-20)
May 4, 2015	MPC	S	3,490	$101.45	$354,060	37,005 Direct	-8.62%	Disposed	618.5% (price as of 2026-08-20)
May 4, 2015	MPC	M	5,426	$51.75	$280,796	40,495 Direct	+15.47%	Acquired	1308.5% (price as of 2026-08-20)
May 4, 2015	MPC	M	17,297	$25.74	$445,225	35,069 Direct	+97.33%	Acquired	2731.7% (price as of 2026-08-20)
May 4, 2015	MPC	M	3,490	$25.74	$89,833	17,772 Direct	+24.44%	Acquired	2731.7% (price as of 2026-08-20)
March 2, 2015	MPLX	A	487	—	—	7,009 Direct	+7.47%	Acquired	(price as of 2026-08-20)
March 2, 2015	MPLX	F	134	$82.17	$11,011	6,522 Direct	-2.01%	Disposed	-28.5% (price as of 2026-08-20)
March 2, 2015	MPC	A	10,667	—	—	10,667 Direct	—	Acquired	(price as of 2026-08-20)
March 2, 2015	MPC	A	1,415	—	—	14,282 Direct	+11.00%	Acquired	(price as of 2026-08-20)
March 2, 2015	MPC	F	178	$102.68	$18,277	12,867 Direct	-1.36%	Disposed	609.9% (price as of 2026-08-20)
March 2, 2015	MPC	F	419	$102.68	$43,023	13,045 Direct	-3.11%	Disposed	609.9% (price as of 2026-08-20)
Feb. 27, 2015	MPC	F	179	$106.58	$19,078	13,464 Direct	-1.31%	Disposed	583.9% (price as of 2026-08-20)
Feb. 27, 2015	MPLX	F	198	$81.14	$16,066	6,656 Direct	-2.89%	Disposed	-27.6% (price as of 2026-08-20)
Jan. 30, 2015	MPC	A	824	—	—	13,643 Direct	+6.43%	Acquired	(price as of 2026-08-20)
Dec. 5, 2014	MPC	F	51	$94.57	$4,823	12,819 Direct	-0.40%	Disposed	670.7% (price as of 2026-08-20)
March 3, 2014	MPC	A	10,937	—	—	10,937 Direct	—	Acquired	(price as of 2026-08-20)
March 3, 2014	MPC	A	1,632	—	—	12,870 Direct	+14.52%	Acquired	(price as of 2026-08-20)
March 3, 2014	MPLX	A	1,232	—	—	6,854 Direct	+21.91%	Acquired	(price as of 2026-08-20)
March 3, 2014	MPC	F	607	$84.18	$51,097	11,238 Direct	-5.12%	Disposed	765.9% (price as of 2026-08-20)
Feb. 27, 2014	MPLX	F	198	$49.36	$9,773	5,622 Direct	-3.40%	Disposed	19.1% (price as of 2026-08-20)
Feb. 27, 2014	MPC	F	179	$85.68	$15,337	11,845 Direct	-1.49%	Disposed	750.7% (price as of 2026-08-20)
Feb. 24, 2014	MPC	F	1,001	$88.78	$88,869	12,024 Direct	-7.69%	Disposed	721.0% (price as of 2026-08-20)
Dec. 5, 2013	MPC	F	51	$84.11	$4,290	13,025 Direct	-0.39%	Disposed	766.6% (price as of 2026-08-20)
June 3, 2013	MPC	F	1,846	$81.59	$150,615	13,076 Direct	-12.37%	Disposed	793.3% (price as of 2026-08-20)
March 11, 2013	MPC	M	8,653	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-20)
March 11, 2013	MPC	M	2,440	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-20)
March 11, 2013	MPC	M	899	—	—	2,440 Direct	-26.92%	Disposed	(price as of 2026-08-20)
March 11, 2013	MPC	M	5,077	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-20)
March 11, 2013	MPC	S	8,653	$88.48	$765,617	14,922 Direct	-36.70%	Disposed	723.8% (price as of 2026-08-20)
March 11, 2013	MPC	M	8,653	$24.79	$214,508	23,575 Direct	+57.99%	Acquired	2840.2% (price as of 2026-08-20)
March 11, 2013	MPC	M	2,440	$43.38	$105,847	14,922 Direct	+19.55%	Acquired	1580.2% (price as of 2026-08-20)
March 11, 2013	MPC	S	899	$88.48	$79,544	12,482 Direct	-6.72%	Disposed	723.8% (price as of 2026-08-20)
March 11, 2013	MPC	M	899	$43.38	$38,999	13,381 Direct	+7.20%	Acquired	1580.2% (price as of 2026-08-20)
March 11, 2013	MPC	S	5,077	$88.48	$449,213	12,482 Direct	-28.91%	Disposed	723.8% (price as of 2026-08-20)
March 11, 2013	MPC	M	5,077	$32.06	$162,769	17,559 Direct	+40.67%	Acquired	2173.5% (price as of 2026-08-20)
March 1, 2013	MPC	F	419	$83.68	$35,062	12,482 Direct	-3.25%	Disposed	771.0% (price as of 2026-08-20)
Feb. 27, 2013	MPC	A	10,458	—	—	10,458 Direct	—	Acquired	(price as of 2026-08-20)
Feb. 27, 2013	MPC	A	1,644	—	—	12,901 Direct	+14.60%	Acquired	(price as of 2026-08-20)
Feb. 27, 2013	MPLX	A	1,820	—	—	5,820 Direct	+45.50%	Acquired	(price as of 2026-08-20)
Dec. 11, 2012	MPC	I	22	$62.05	$1,365	0 Indirect	-100.00%	Disposed	1074.7% (price as of 2026-08-20)
Dec. 10, 2012	MPC	I	3,819	$60.50	$231,050	22 Indirect	-99.43%	Disposed	1104.8% (price as of 2026-08-20)
Dec. 5, 2012	MPC	F	35	$58.69	$2,054	11,257 Direct	-0.31%	Disposed	1141.9% (price as of 2026-08-20)
Oct. 31, 2012	MPLX	P	4,000	$22.00	$88,000	4,000 Direct	—	Acquired	167.1% (price as of 2026-08-20)
Feb. 29, 2012	MPC	A	22,409	—	—	22,409 Direct	—	Acquired	(price as of 2026-08-20)
Feb. 29, 2012	MPC	A	3,851	—	—	11,291 Direct	+51.76%	Acquired	(price as of 2026-08-20)
Dec. 5, 2011	MPC	A	4,436	—	—	4,436 Direct	—	Acquired	(price as of 2026-08-20)
Dec. 5, 2011	MPC	A	321	—	—	7,440 Direct	+4.51%	Acquired	(price as of 2026-08-20)
Aug. 9, 2011	MPC	I	3,700	$34.74	$128,538	3,700 Indirect	—	Acquired	1998.1% (price as of 2026-08-20)
June 30, 2011	MPC	A	21,125	—	—	21,125 Direct	—	Acquired	(price as of 2026-08-20)
June 30, 2011	MPC	A	20,787	—	—	20,787 Direct	—	Acquired	(price as of 2026-08-20)
June 30, 2011	MPC	A	8,653	—	—	8,653 Direct	—	Acquired	(price as of 2026-08-20)
June 30, 2011	MPC	A	3,339	—	—	3,339 Direct	—	Acquired	(price as of 2026-08-20)
June 30, 2011	MPC	A	5,426	—	—	5,426 Direct	—	Acquired	(price as of 2026-08-20)
June 30, 2011	MPC	A	5,077	—	—	5,077 Direct	—	Acquired	(price as of 2026-08-20)
June 30, 2011	MPC	A	6,977	—	—	7,131 Direct	+4530.52%	Acquired	(price as of 2026-08-20)

P = Open-market purchase · S = Sale · A = Grant/award · M = Option exercise · G = Gift · F = Tax withholding

Insider transactions are not a recommendation; sales are often driven by liquidity or tax reasons.

Derivative holdings (Form 4 Table II)

Options, RSUs and convertible securities reported on Form 4 Table II.

Date	Ticker	Security	Underlying	Exercise price	Expiration	Shares	A/D
May 6, 2015	MPC	Stock Option (right to buy)	Common Stock (4,436)	$34.40	Dec. 5, 2021	4,436	Disposed
May 6, 2015	MPC	Stock Option (right to buy)	Common Stock (21,125)	$41.69	Feb. 23, 2021	21,125	Disposed
May 4, 2015	MPC	Stock Option (right to buy)	Common Stock (17,297)	$25.74	May 26, 2020	17,297	Disposed
May 4, 2015	MPC	Stock Option (right to buy)	Common Stock (3,490)	$25.74	May 26, 2020	3,490	Disposed
May 4, 2015	MPC	Stock Option (right to buy)	Common Stock (5,426)	$51.75	May 30, 2017	5,426	Disposed
March 2, 2015	MPC	Stock Option (right to buy)	Common Stock (10,667)	$101.78	March 1, 2025	10,667	Acquired
March 3, 2014	MPC	Stock Option (right to buy)	Common Stock (10,937)	$83.37	March 1, 2024	10,937	Acquired
March 11, 2013	MPC	Stock Option (right to buy)	Common Stock (8,653)	$24.79	May 27, 2019	8,653	Disposed
March 11, 2013	MPC	Stock Option (right to buy)	Common Stock (2,440)	$43.38	May 28, 2018	2,440	Disposed
March 11, 2013	MPC	Stock Option (right to buy)	Common Stock (899)	$43.38	May 28, 2018	899	Disposed
March 11, 2013	MPC	Stock Option (right to buy)	Common Stock (5,077)	$32.06	June 1, 2016	5,077	Disposed
Feb. 27, 2013	MPC	Stock Option (right to buy)	Common Stock (10,458)	$82.74	Feb. 27, 2023	10,458	Acquired
Feb. 29, 2012	MPC	Stock Option (right to buy)	Common Stock (22,409)	$41.55	March 1, 2022	22,409	Acquired
Dec. 5, 2011	MPC	Stock Option (right to buy)	Common Stock (4,436)	$34.40	Dec. 5, 2021	4,436	Acquired
June 30, 2011	MPC	Stock Option (right to buy)	Common Stock (21,125)	$41.69	Feb. 23, 2021	21,125	Acquired
June 30, 2011	MPC	Stock Option (right to buy)	Common Stock (20,787)	$25.74	May 26, 2020	20,787	Acquired
June 30, 2011	MPC	Stock Option (right to buy)	Common Stock (8,653)	$24.79	May 27, 2019	8,653	Acquired
June 30, 2011	MPC	Stock Option (right to buy)	Common Stock (3,339)	$43.38	May 28, 2018	3,339	Acquired
June 30, 2011	MPC	Stock Option (right to buy)	Common Stock (5,426)	$51.75	May 30, 2017	5,426	Acquired
June 30, 2011	MPC	Stock Option (right to buy)	Common Stock (5,077)	$32.06	June 1, 2016	5,077	Acquired

Exercise/conversion price is blank when not applicable (e.g. RSUs).