William N. Mathis

Insider

First SEC filing: April 12, 2016 · Latest: April 12, 2016

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

BSM selling June 14, 2019

Insider transactions

0 buys (P) 0 sells (S) Net: $0 + 74 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

74 other filings hidden

Date	Ticker	Code	Shares	Price	Value	Owned after	Δ own	A/D	vs now
Oct. 6, 2023	BSM	A	1,233	$17.23	$21,245	208,298 Direct	+0.60%	Acquired	-14.7% (price as of 2026-08-20)
July 7, 2023	BSM	A	1,332	$15.95	$21,245	207,065 Direct	+0.65%	Acquired	-7.8% (price as of 2026-08-20)
April 6, 2023	BSM	A	1,354	$15.69	$21,244	205,733 Direct	+0.66%	Acquired	-6.3% (price as of 2026-08-20)
Jan. 11, 2023	BSM	A	12,539	—	—	204,379 Direct	+6.54%	Acquired	(price as of 2026-08-20)
Jan. 6, 2023	BSM	A	1,259	$16.87	$21,239	191,840 Direct	+0.66%	Acquired	-12.9% (price as of 2026-08-20)
Oct. 7, 2022	BSM	A	1,357	$15.65	$21,237	190,581 Direct	+0.72%	Acquired	-6.1% (price as of 2026-08-20)
July 1, 2022	BSM	A	1,552	$13.69	$21,247	189,224 Direct	+0.83%	Acquired	7.4% (price as of 2026-08-20)
April 1, 2022	BSM	A	1,578	$13.46	$21,240	187,672 Direct	+0.85%	Acquired	9.2% (price as of 2026-08-20)
Jan. 11, 2022	BSM	A	14,115	—	—	186,094 Direct	+8.21%	Acquired	(price as of 2026-08-20)
Jan. 7, 2022	BSM	A	2,361	$10.35	$24,436	171,979 Direct	+1.39%	Acquired	42.0% (price as of 2026-08-20)
Oct. 1, 2021	BSM	A	1,498	$12.05	$18,051	169,618 Direct	+0.89%	Acquired	22.0% (price as of 2026-08-20)
July 2, 2021	BSM	A	1,680	$10.75	$18,060	168,120 Direct	+1.01%	Acquired	36.7% (price as of 2026-08-20)
April 5, 2021	BSM	A	2,071	$8.72	$18,059	166,440 Direct	+1.26%	Acquired	68.6% (price as of 2026-08-20)
Jan. 12, 2021	BSM	A	15,414	—	—	164,369 Direct	+10.35%	Acquired	(price as of 2026-08-20)
Jan. 4, 2021	BSM	A	2,703	$6.68	$18,056	148,955 Direct	+1.85%	Acquired	120.1% (price as of 2026-08-20)
Oct. 2, 2020	BSM	A	2,941	$6.14	$18,058	146,252 Direct	+2.05%	Acquired	139.4% (price as of 2026-08-20)
July 1, 2020	BSM	A	2,778	$6.50	$18,057	143,311 Direct	+1.98%	Acquired	126.2% (price as of 2026-08-20)
April 3, 2020	BSM	A	3,859	$4.68	$18,060	140,533 Direct	+2.82%	Acquired	214.1% (price as of 2026-08-20)
Jan. 13, 2020	BSM	A	13,389	—	—	136,674 Direct	+10.86%	Acquired	(price as of 2026-08-20)
Jan. 3, 2020	BSM	A	1,670	$12.72	$21,242	123,285 Direct	+1.37%	Acquired	15.6% (price as of 2026-08-20)
Oct. 4, 2019	BSM	A	1,492	$14.24	$21,246	121,615 Direct	+1.24%	Acquired	3.2% (price as of 2026-08-20)
July 8, 2019	BSM	A	1,370	$15.50	$21,235	120,123 Direct	+1.15%	Acquired	-5.2% (price as of 2026-08-20)
June 14, 2019	BSM	W	7,448	—	—	7,448 Indirect	—	Acquired	(price as of 2026-08-20)
June 14, 2019	BSM	W	210,960	—	—	210,960 Indirect	—	Acquired	(price as of 2026-08-20)
June 14, 2019	BSM	W	7,449	—	—	7,449 Indirect	—	Acquired	(price as of 2026-08-20)
June 14, 2019	BSM	W	210,959	—	—	210,959 Indirect	—	Acquired	(price as of 2026-08-20)
June 14, 2019	BSM	W	436,816	—	—	0 Indirect	-100.00%	Disposed	(price as of 2026-08-20)
June 14, 2019	BSM	S	2	$15.85	$32	436,816 Indirect	0.00%	Disposed	-7.3% (price as of 2026-08-20)
May 24, 2019	BSM	C	133,277	—	—	0 Indirect	-100.00%	Disposed	(price as of 2026-08-20)
May 24, 2019	BSM	C	247,701	—	—	0 Indirect	-100.00%	Disposed	(price as of 2026-08-20)
May 24, 2019	BSM	C	771,379	—	—	0 Indirect	-100.00%	Disposed	(price as of 2026-08-20)
May 24, 2019	BSM	C	635,845	—	—	0 Indirect	-100.00%	Disposed	(price as of 2026-08-20)
May 24, 2019	BSM	C	101,454	—	—	0 Indirect	-100.00%	Disposed	(price as of 2026-08-20)
May 24, 2019	BSM	C	31,314	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-20)
May 24, 2019	BSM	C	133,277	—	—	235,032 Indirect	+130.98%	Acquired	(price as of 2026-08-20)
May 24, 2019	BSM	C	247,701	—	—	436,818 Indirect	+130.98%	Acquired	(price as of 2026-08-20)
May 24, 2019	BSM	C	771,379	—	—	1,387,107 Indirect	+125.28%	Acquired	(price as of 2026-08-20)
May 24, 2019	BSM	C	635,845	—	—	1,121,304 Indirect	+130.98%	Acquired	(price as of 2026-08-20)
May 24, 2019	BSM	C	101,454	—	—	178,913 Indirect	+130.98%	Acquired	(price as of 2026-08-20)
May 24, 2019	BSM	C	31,314	—	—	118,753 Direct	+35.81%	Acquired	(price as of 2026-08-20)
April 5, 2019	BSM	A	1,204	$17.64	$21,239	87,439 Direct	+1.40%	Acquired	-16.7% (price as of 2026-08-20)
Jan. 11, 2019	BSM	A	10,842	—	—	86,235 Direct	+14.38%	Acquired	(price as of 2026-08-20)
Jan. 4, 2019	BSM	A	1,372	$15.48	$21,239	75,393 Direct	+1.85%	Acquired	-5.0% (price as of 2026-08-20)
Nov. 13, 2018	BSM	P	4,213	$16.62	$70,020	615,728 Indirect	+0.69%	Acquired	-11.6% (price as of 2026-08-20)
Nov. 12, 2018	BSM	P	6,887	$16.88	$116,253	611,515 Indirect	+1.14%	Acquired	-12.9% (price as of 2026-08-20)
Nov. 9, 2018	BSM	P	300	$16.95	$5,085	604,628 Indirect	+0.05%	Acquired	-13.3% (price as of 2026-08-20)
Oct. 5, 2018	BSM	A	1,166	$18.21	$21,233	74,021 Direct	+1.60%	Acquired	-19.3% (price as of 2026-08-20)
July 6, 2018	BSM	A	1,149	$18.49	$21,245	72,855 Direct	+1.60%	Acquired	-20.5% (price as of 2026-08-20)
April 6, 2018	BSM	A	1,283	$16.55	$21,234	71,706 Direct	+1.82%	Acquired	-11.2% (price as of 2026-08-20)
April 5, 2018	BSM	C	242,745	—	—	485,459 Indirect	+100.01%	Acquired	(price as of 2026-08-20)
April 5, 2018	BSM	C	317,942	—	—	635,845 Indirect	+100.01%	Acquired	(price as of 2026-08-20)
April 5, 2018	BSM	C	8,000	—	—	0 Indirect	-100.00%	Disposed	(price as of 2026-08-20)
Jan. 11, 2018	BSM	A	9,536	—	—	70,423 Direct	+15.66%	Acquired	(price as of 2026-08-20)
Jan. 5, 2018	BSM	A	1,184	$17.94	$21,241	60,887 Direct	+1.98%	Acquired	-18.1% (price as of 2026-08-20)
Oct. 6, 2017	BSM	A	1,225	$17.34	$21,242	59,703 Direct	+2.09%	Acquired	-15.2% (price as of 2026-08-20)
July 7, 2017	BSM	A	1,348	$15.76	$21,244	58,478 Direct	+2.36%	Acquired	-6.7% (price as of 2026-08-20)
April 6, 2017	BSM	A	1,287	$16.51	$21,248	57,130 Direct	+2.30%	Acquired	-11.0% (price as of 2026-08-20)
March 31, 2017	BSM	X	8,000	$1024.38	$8,195,040	8,000 Indirect	-50.00%	Disposed	-98.6% (price as of 2026-08-20)
Jan. 11, 2017	BSM	A	9,095	—	—	55,843 Direct	+19.46%	Acquired	(price as of 2026-08-20)
Jan. 6, 2017	BSM	A	1,131	$18.78	$21,240	46,748 Direct	+2.48%	Acquired	-21.7% (price as of 2026-08-20)
Oct. 7, 2016	BSM	A	1,193	$17.81	$21,247	45,617 Direct	+2.69%	Acquired	-17.5% (price as of 2026-08-20)
July 8, 2016	BSM	A	1,370	$15.50	$21,235	44,424 Direct	+3.18%	Acquired	-5.2% (price as of 2026-08-20)
April 8, 2016	BSM	X	8,000	$1026.78	$8,214,240	16,000 Indirect	-33.33%	Disposed	-98.6% (price as of 2026-08-20)
April 8, 2016	BSM	A	1,516	$14.01	$21,239	43,054 Direct	+3.65%	Acquired	4.9% (price as of 2026-08-20)
March 14, 2016	BSM	P	11,410	$13.71	$156,431	604,328 Indirect	+1.92%	Acquired	7.2% (price as of 2026-08-20)
March 10, 2016	BSM	P	3,979	$13.50	$53,716	592,918 Indirect	+0.68%	Acquired	8.9% (price as of 2026-08-20)
May 6, 2015	BSM	J	24,000	—	—	1,627,028 Indirect	+1.50%	Acquired	(price as of 2026-08-20)
May 6, 2015	BSM	J	133,277	—	—	1,603,028 Indirect	+9.07%	Acquired	(price as of 2026-08-20)
May 6, 2015	BSM	J	247,701	—	—	1,469,751 Indirect	+20.27%	Acquired	(price as of 2026-08-20)
May 6, 2015	BSM	J	771,379	—	—	1,222,050 Indirect	+171.16%	Acquired	(price as of 2026-08-20)
May 6, 2015	BSM	J	317,903	—	—	450,671 Indirect	+239.44%	Acquired	(price as of 2026-08-20)
May 6, 2015	BSM	J	101,454	—	—	132,768 Indirect	+323.99%	Acquired	(price as of 2026-08-20)
May 6, 2015	BSM	J	31,314	—	—	31,314 Direct	—	Acquired	(price as of 2026-08-20)
May 6, 2015	BSM	J	101,755	—	—	1,229,154 Indirect	+9.03%	Acquired	(price as of 2026-08-20)
May 6, 2015	BSM	J	189,117	—	—	1,127,399 Indirect	+20.16%	Acquired	(price as of 2026-08-20)
May 6, 2015	BSM	J	588,939	—	—	938,282 Indirect	+168.58%	Acquired	(price as of 2026-08-20)
May 6, 2015	BSM	J	242,714	—	—	349,343 Indirect	+227.62%	Acquired	(price as of 2026-08-20)
May 6, 2015	BSM	J	77,459	—	—	106,629 Indirect	+265.54%	Acquired	(price as of 2026-08-20)
May 6, 2015	BSM	J	23,907	—	—	29,170 Direct	+454.25%	Acquired	(price as of 2026-08-20)
May 6, 2015	BSM	A	5,263	—	—	5,263 Direct	—	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 24, 2019	BSM	Subordinated units representing limited partner interests	Common units representing limited partner interests (133,277)	—	—	133,277	Disposed
May 24, 2019	BSM	Subordinated units representing limited partner interests	Common units representing limited partner interests (247,701)	—	—	247,701	Disposed
May 24, 2019	BSM	Subordinated units representing limited partner interests	Common units representing limited partner interests (771,379)	—	—	771,379	Disposed
May 24, 2019	BSM	Subordinated units representing limited partner interests	Common units representing limited partner interests (635,845)	—	—	635,845	Disposed
May 24, 2019	BSM	Subordinated units representing limited partner interests	Common units representing limited partner interests (101,454)	—	—	101,454	Disposed
May 24, 2019	BSM	Subordinated units representing limited partner interests	Common units representing limited partner interests (31,314)	—	—	31,314	Disposed
April 5, 2018	BSM	Subordinated units representing limited partner interests	Common units representing limited partner interests (317,942)	—	—	317,942	Acquired
April 5, 2018	BSM	Preferred units representing limited partner interests	Common and subordinated units representing LP interests	—	—	8,000	Disposed
March 31, 2017	BSM	Preferred units representing limited partner interests	Common and subordinated units representing LP interests	—	—	8,000	Disposed
April 8, 2016	BSM	Preferred units representing limited partner interests	Common and subordinated units representing LP interests	—	—	8,000	Disposed
May 6, 2015	BSM	Preferred units representing limited partner interests	Common and subordinated units representing LP interests	—	—	24,000	Acquired
May 6, 2015	BSM	Subordinated units representing limited partner interests	Common units representing limited partner interests (133,277)	—	—	133,277	Acquired
May 6, 2015	BSM	Subordinated units representing limited partner interests	Common units representing limited partner interests (247,701)	—	—	247,701	Acquired
May 6, 2015	BSM	Subordinated units representing limited partner interests	Common units representing limited partner interests (771,379)	—	—	771,379	Acquired
May 6, 2015	BSM	Subordinated units representing limited partner interests	Common units representing limited partner interests (317,903)	—	—	317,903	Acquired
May 6, 2015	BSM	Subordinated units representing limited partner interests	Common units representing limited partner interests (101,454)	—	—	101,454	Acquired
May 6, 2015	BSM	Subordinated units representing limited partner interests	Common units representing limited partner interests (31,314)	—	—	31,314	Acquired

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