Mary L Whitson

Insider

First SEC filing: Jan. 30, 2008 · Latest: Jan. 30, 2008

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.
Initial holdings The stakes this person held when they first started reporting.

Insider at

SD selling Oct. 9, 2013

Insider transactions

0 buys (P) 0 sells (S) Net: $0 + 71 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

71 other filings hidden

Date	Ticker	Code	Shares	Price	Value	Owned after	Δ own	A/D	vs now
Oct. 9, 2013	SD	S	8,000	$5.99	$47,920	294,433 Direct	-2.65%	Disposed	139.2% (price as of 2026-08-21)
Oct. 1, 2013	SD	A	6,321	$6.14	$38,811	302,433 Direct	+2.13%	Acquired	133.4% (price as of 2026-08-21)
July 13, 2013	SD	F	2,935	$4.87	$14,293	296,112 Direct	-0.98%	Disposed	194.3% (price as of 2026-08-21)
July 10, 2013	SD	F	1,467	$5.05	$7,408	299,047 Direct	-0.49%	Disposed	183.8% (price as of 2026-08-21)
July 9, 2013	SD	F	2,446	$4.90	$11,985	300,514 Direct	-0.81%	Disposed	192.4% (price as of 2026-08-21)
July 8, 2013	SD	F	2,935	$4.87	$14,293	302,960 Direct	-0.96%	Disposed	194.3% (price as of 2026-08-21)
July 1, 2013	SD	A	2,782	$4.80	$13,354	305,895 Direct	+0.92%	Acquired	198.5% (price as of 2026-08-21)
April 9, 2013	SD	S	10,000	$5.19	$51,900	303,113 Direct	-3.19%	Disposed	176.1% (price as of 2026-08-21)
April 1, 2013	SD	A	3,032	$5.22	$15,827	313,113 Direct	+0.98%	Acquired	174.5% (price as of 2026-08-21)
Jan. 15, 2013	SD	A	36,000	—	—	310,081 Direct	+13.13%	Acquired	(price as of 2026-08-21)
Jan. 14, 2013	SD	F	2,934	$6.66	$19,540	274,081 Direct	-1.06%	Disposed	115.2% (price as of 2026-08-21)
Jan. 13, 2013	SD	F	2,934	$6.86	$20,127	277,015 Direct	-1.05%	Disposed	108.9% (price as of 2026-08-21)
Jan. 9, 2013	SD	F	1,468	$6.93	$10,173	279,949 Direct	-0.52%	Disposed	106.8% (price as of 2026-08-21)
Jan. 8, 2013	SD	F	1,437	$6.97	$10,016	281,417 Direct	-0.51%	Disposed	105.6% (price as of 2026-08-21)
Jan. 2, 2013	SD	A	2,081	$6.42	$13,360	282,854 Direct	+0.74%	Acquired	123.2% (price as of 2026-08-21)
Oct. 1, 2012	SD	A	5,504	$7.06	$38,858	280,773 Direct	+2.00%	Acquired	103.0% (price as of 2026-08-21)
July 13, 2012	SD	A	36,000	—	—	275,269 Direct	+15.05%	Acquired	(price as of 2026-08-21)
July 11, 2012	SD	F	714	$6.16	$4,398	239,269 Direct	-0.30%	Disposed	132.6% (price as of 2026-08-21)
July 10, 2012	SD	F	1,427	$6.10	$8,705	239,983 Direct	-0.59%	Disposed	134.9% (price as of 2026-08-21)
July 9, 2012	SD	F	2,378	$6.41	$15,243	241,410 Direct	-0.98%	Disposed	123.6% (price as of 2026-08-21)
July 8, 2012	SD	F	2,854	$6.43	$18,351	243,788 Direct	-1.16%	Disposed	122.9% (price as of 2026-08-21)
July 2, 2012	SD	A	2,044	$6.54	$13,368	246,642 Direct	+0.84%	Acquired	119.1% (price as of 2026-08-21)
April 2, 2012	SD	A	2,035	$8.00	$16,280	244,598 Direct	+0.84%	Acquired	79.1% (price as of 2026-08-21)
Jan. 14, 2012	SD	F	2,854	$8.05	$22,975	242,563 Direct	-1.16%	Disposed	78.0% (price as of 2026-08-21)
Jan. 13, 2012	SD	A	36,000	—	—	245,417 Direct	+17.19%	Acquired	(price as of 2026-08-21)
Jan. 11, 2012	SD	F	714	$8.47	$6,048	209,417 Direct	-0.34%	Disposed	69.2% (price as of 2026-08-21)
Jan. 9, 2012	SD	F	1,614	$8.50	$13,719	210,131 Direct	-0.76%	Disposed	68.6% (price as of 2026-08-21)
Jan. 8, 2012	SD	F	1,616	$8.54	$13,801	211,745 Direct	-0.76%	Disposed	67.8% (price as of 2026-08-21)
Jan. 3, 2012	SD	A	1,563	$8.30	$12,973	213,361 Direct	+0.74%	Acquired	72.7% (price as of 2026-08-21)
Oct. 3, 2011	SD	A	7,407	$5.07	$37,553	211,798 Direct	+3.62%	Acquired	182.6% (price as of 2026-08-21)
July 11, 2011	SD	F	719	$10.28	$7,391	205,190 Direct	-0.35%	Disposed	39.4% (price as of 2026-08-21)
July 11, 2011	SD	F	799	$10.28	$8,214	204,391 Direct	-0.39%	Disposed	39.4% (price as of 2026-08-21)
July 10, 2011	SD	F	1,438	$10.83	$15,574	205,909 Direct	-0.69%	Disposed	32.3% (price as of 2026-08-21)
July 9, 2011	SD	F	2,397	$10.83	$25,960	207,347 Direct	-1.14%	Disposed	32.3% (price as of 2026-08-21)
July 8, 2011	SD	A	36,000	—	—	209,744 Direct	+20.72%	Acquired	(price as of 2026-08-21)
July 1, 2011	SD	A	1,171	$10.55	$12,354	173,744 Direct	+0.68%	Acquired	35.8% (price as of 2026-08-21)
April 1, 2011	SD	A	901	$13.01	$11,722	172,573 Direct	+0.52%	Acquired	10.1% (price as of 2026-08-21)
Jan. 14, 2011	SD	A	36,000	—	—	171,672 Direct	+26.53%	Acquired	(price as of 2026-08-21)
Jan. 11, 2011	SD	F	738	$7.80	$5,756	135,672 Direct	-0.54%	Disposed	83.7% (price as of 2026-08-21)
Jan. 10, 2011	SD	F	904	$7.85	$7,096	136,410 Direct	-0.66%	Disposed	82.5% (price as of 2026-08-21)
Jan. 9, 2011	SD	F	1,627	$7.81	$12,707	137,314 Direct	-1.17%	Disposed	83.5% (price as of 2026-08-21)
Jan. 8, 2011	SD	F	1,627	$7.81	$12,707	138,941 Direct	-1.16%	Disposed	83.5% (price as of 2026-08-21)
Jan. 3, 2011	SD	A	1,607	$7.54	$12,117	140,568 Direct	+1.16%	Acquired	90.1% (price as of 2026-08-21)
Oct. 5, 2010	SD	A	5,602	$5.87	$32,884	138,961 Direct	+4.20%	Acquired	144.1% (price as of 2026-08-21)
July 11, 2010	SD	F	718	$6.26	$4,495	134,157 Direct	-0.53%	Disposed	128.9% (price as of 2026-08-21)
July 11, 2010	SD	F	798	$6.26	$4,995	133,359 Direct	-0.59%	Disposed	128.9% (price as of 2026-08-21)
July 10, 2010	SD	F	1,437	$6.26	$8,996	134,875 Direct	-1.05%	Disposed	128.9% (price as of 2026-08-21)
July 9, 2010	SD	A	30,000	—	—	136,312 Direct	+28.22%	Acquired	(price as of 2026-08-21)
July 6, 2010	SD	A	2,053	$5.90	$12,113	106,312 Direct	+1.97%	Acquired	142.9% (price as of 2026-08-21)
April 5, 2010	SD	A	2,143	$7.58	$16,244	104,259 Direct	+2.10%	Acquired	89.1% (price as of 2026-08-21)
Jan. 11, 2010	SD	F	718	$10.34	$7,424	102,116 Direct	-0.70%	Disposed	38.6% (price as of 2026-08-21)
Jan. 10, 2010	SD	F	798	$10.84	$8,650	102,834 Direct	-0.77%	Disposed	32.2% (price as of 2026-08-21)
Jan. 9, 2010	SD	F	1,437	$10.84	$15,577	103,632 Direct	-1.37%	Disposed	32.2% (price as of 2026-08-21)
Jan. 8, 2010	SD	A	18,000	—	—	105,069 Direct	+20.67%	Acquired	(price as of 2026-08-21)
Jan. 4, 2010	SD	A	1,112	$10.12	$11,253	87,069 Direct	+1.29%	Acquired	41.6% (price as of 2026-08-21)
Oct. 7, 2009	SD	A	2,243	$13.08	$29,338	85,957 Direct	+2.68%	Acquired	9.6% (price as of 2026-08-21)
July 11, 2009	SD	F	798	$8.77	$6,998	84,432 Direct	-0.94%	Disposed	63.4% (price as of 2026-08-21)
July 11, 2009	SD	F	718	$8.77	$6,297	83,714 Direct	-0.85%	Disposed	63.4% (price as of 2026-08-21)
July 10, 2009	SD	A	18,000	—	—	85,230 Direct	+26.77%	Acquired	(price as of 2026-08-21)
July 2, 2009	SD	P	100	$8.39	$839	200 Indirect	+100.00%	Acquired	70.8% (price as of 2026-08-21)
July 1, 2009	SD	A	1,477	$8.61	$12,717	67,230 Direct	+2.25%	Acquired	66.4% (price as of 2026-08-21)
March 30, 2009	SD	A	1,545	$6.57	$10,151	65,753 Direct	+2.41%	Acquired	118.1% (price as of 2026-08-21)
Jan. 11, 2009	SD	F	718	$7.85	$5,636	64,208 Direct	-1.11%	Disposed	82.5% (price as of 2026-08-21)
Jan. 10, 2009	SD	F	798	$7.85	$6,264	64,926 Direct	-1.21%	Disposed	82.5% (price as of 2026-08-21)
Jan. 9, 2009	SD	A	18,000	—	—	65,724 Direct	+37.72%	Acquired	(price as of 2026-08-21)
Jan. 7, 2009	SD	A	1,610	$7.90	$12,719	47,724 Direct	+3.49%	Acquired	81.4% (price as of 2026-08-21)
Oct. 17, 2008	SD	A	2,286	$11.62	$26,563	46,114 Direct	+5.22%	Acquired	23.3% (price as of 2026-08-21)
Aug. 15, 2008	SD	P	100	$33.37	$3,337	100 Indirect	—	Acquired	-57.1% (price as of 2026-08-21)
July 14, 2008	SD	A	654	$35.86	$23,452	43,379 Direct	+1.53%	Acquired	-60.0% (price as of 2026-08-21)
July 14, 2008	SD	A	249	$39.15	$9,748	43,628 Direct	+0.57%	Acquired	-63.4% (price as of 2026-08-21)
July 14, 2008	SD	A	200	$60.53	$12,106	43,828 Direct	+0.46%	Acquired	-76.3% (price as of 2026-08-21)
July 11, 2008	SD	F	798	$61.46	$49,045	33,725 Direct	-2.31%	Disposed	-76.7% (price as of 2026-08-21)
July 11, 2008	SD	A	9,000	—	—	42,725 Direct	+26.69%	Acquired	(price as of 2026-08-21)
Jan. 11, 2008	SD	A	9,000	—	—	32,081 Direct	+38.99%	Acquired	(price as of 2026-08-21)
Jan. 10, 2008	SD	F	798	$31.06	$24,786	23,081 Direct	-3.34%	Disposed	-53.9% (price as of 2026-08-21)
Nov. 9, 2007	SD	P	600	$26.00	$15,600	23,879 Direct	+2.58%	Acquired	-44.9% (price as of 2026-08-21)

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.

Initial ownership (Form 3) 2 holdings

Securities held when first becoming an insider, per SEC Form 3.

Date	Ticker	Security	Shares	Ownership
Jan. 30, 2008	SD	Common Stock	25,721	Direct
Nov. 5, 2007	SD	Common Stock	23,279	Direct