William Charles Taylor

Insider

First SEC filing: Sept. 24, 2009 · Latest: Jan. 25, 2017

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

Insider at

MDXG selling June 14, 2017

Insider transactions

0 buys (P) 0 sells (S) Net: $0 + 67 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

67 other filings hidden

Date	Ticker	Code	Shares	Price	Value	Owned after	Δ own	A/D	vs now
Feb. 27, 2018	MDXG	M	20,000	$1.65	$33,000	557,057 Direct	+3.72%	Acquired	168.8% (price as of 2026-08-20)
Feb. 27, 2018	MDXG	M	20,000	$1.65	$33,000	269,394 Direct	-6.91%	Disposed	168.8% (price as of 2026-08-20)
Feb. 25, 2018	MDXG	F	7,287	$7.83	$57,057	537,057 Direct	-1.34%	Disposed	-43.4% (price as of 2026-08-20)
Feb. 22, 2018	MDXG	F	8,805	$8.88	$78,188	468,619 Direct	-1.84%	Disposed	-50.1% (price as of 2026-08-20)
Feb. 22, 2018	MDXG	F	15,175	$8.88	$134,754	453,444 Direct	-3.24%	Disposed	-50.1% (price as of 2026-08-20)
Feb. 22, 2018	MDXG	A	90,900	$8.88	$807,192	544,344 Direct	+20.05%	Acquired	-50.1% (price as of 2026-08-20)
Oct. 26, 2017	MDXG	A	10,000	—	—	477,424 Direct	+2.14%	Acquired	(price as of 2026-08-20)
June 14, 2017	MDXG	M	13,812	$7.24	$99,999	547,424 Direct	+2.59%	Acquired	-38.7% (price as of 2026-08-20)
June 14, 2017	MDXG	S 10b5-1	80,000	$14.52	$1,161,600	467,424 Direct	-14.61%	Disposed	-69.5% (price as of 2026-08-20)
June 14, 2017	MDXG	M	13,812	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-20)
May 25, 2017	MDXG	S 10b5-1	26,571	$13.74	$365,086	533,612 Direct	-4.74%	Disposed	-67.7% (price as of 2026-08-20)
May 10, 2017	MDXG	M	19,723	$5.07	$99,996	560,183 Direct	+3.65%	Acquired	-12.5% (price as of 2026-08-20)
May 10, 2017	MDXG	M	19,723	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-20)
April 27, 2017	MDXG	S 10b5-1	26,000	$11.40	$296,400	540,460 Direct	-4.59%	Disposed	-61.1% (price as of 2026-08-20)
March 6, 2017	MDXG	S 10b5-1	26,000	$8.18	$212,680	566,460 Direct	-4.39%	Disposed	-45.8% (price as of 2026-08-20)
Feb. 25, 2017	MDXG	F	11,929	—	—	592,460 Direct	-1.97%	Disposed	(price as of 2026-08-20)
Feb. 22, 2017	MDXG	A	150,000	—	—	614,370 Direct	+32.30%	Acquired	(price as of 2026-08-20)
Feb. 22, 2017	MDXG	F	9,981	—	—	604,389 Direct	-1.62%	Disposed	(price as of 2026-08-20)
Sept. 6, 2016	MDXG	S 10b5-1	20,400	$7.55	$154,020	566,566 Direct	-3.48%	Disposed	-41.3% (price as of 2026-08-20)
Aug. 1, 2016	MDXG	S 10b5-1	25,000	$7.55	$188,750	586,966 Direct	-4.09%	Disposed	-41.3% (price as of 2026-08-20)
July 29, 2016	MDXG	S 10b5-1	350	$7.50	$2,625	611,966 Direct	-0.06%	Disposed	-40.9% (price as of 2026-08-20)
July 28, 2016	MDXG	S 10b5-1	3,762	$7.53	$28,328	612,316 Direct	-0.61%	Disposed	-41.1% (price as of 2026-08-20)
June 16, 2016	MDXG	S 10b5-1	24,333	$7.52	$182,984	616,078 Direct	-3.80%	Disposed	-41.0% (price as of 2026-08-20)
March 6, 2016	MDXG	F	6,114	—	—	640,411 Direct	-0.95%	Disposed	(price as of 2026-08-20)
Feb. 25, 2016	MDXG	F	4,058	—	—	654,533 Direct	-0.62%	Disposed	(price as of 2026-08-20)
Feb. 25, 2016	MDXG	F	8,008	—	—	646,525 Direct	-1.22%	Disposed	(price as of 2026-08-20)
Feb. 22, 2016	MDXG	A	85,000	—	—	658,591 Direct	+14.82%	Acquired	(price as of 2026-08-20)
Oct. 30, 2015	MDXG	M	40,606	$1.65	$67,000	573,591 Direct	+7.62%	Acquired	168.8% (price as of 2026-08-20)
Oct. 30, 2015	MDXG	M	40,606	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-20)
May 19, 2015	MDXG	M	80,000	$1.25	$100,000	512,985 Direct	+18.48%	Acquired	254.8% (price as of 2026-08-20)
May 19, 2015	MDXG	M	20,000	$1.65	$33,000	532,985 Direct	+3.90%	Acquired	168.8% (price as of 2026-08-20)
May 19, 2015	MDXG	M	80,000	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-20)
May 19, 2015	MDXG	M	20,000	—	—	40,606 Direct	-33.00%	Disposed	(price as of 2026-08-20)
May 18, 2015	MDXG	S 10b5-1	120,526	$10.01	$1,206,465	432,985 Direct	-21.77%	Disposed	-55.7% (price as of 2026-08-20)
May 15, 2015	MDXG	S 10b5-1	29,474	$10.00	$294,740	553,511 Direct	-5.06%	Disposed	-55.7% (price as of 2026-08-20)
March 9, 2015	MDXG	S 10b5-1	5,989	$10.02	$60,010	582,985 Direct	-1.02%	Disposed	-55.7% (price as of 2026-08-20)
Feb. 25, 2015	MDXG	A	72,036	—	—	588,974 Direct	+13.94%	Acquired	(price as of 2026-08-20)
Jan. 5, 2015	MDXG	M	32,342	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-20)
Jan. 5, 2015	MDXG	M	25,000	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-20)
Jan. 5, 2015	MDXG	M	32,432	$1.23	$39,891	516,938 Direct	+6.69%	Acquired	260.6% (price as of 2026-08-20)
Jan. 5, 2015	MDXG	M	25,000	$1.35	$33,750	484,506 Direct	+5.44%	Acquired	228.5% (price as of 2026-08-20)
Oct. 31, 2014	MDXG	M	62,136	—	—	52,864 Direct	-54.03%	Disposed	(price as of 2026-08-20)
Oct. 31, 2014	MDXG	M	87,864	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-20)
Oct. 31, 2014	MDXG	S 10b5-1	62,136	$10.01	$621,981	459,506 Direct	-11.91%	Disposed	-55.7% (price as of 2026-08-20)
Oct. 31, 2014	MDXG	S 10b5-1	87,864	$10.01	$879,519	521,642 Direct	-14.42%	Disposed	-55.7% (price as of 2026-08-20)
Oct. 31, 2014	MDXG	M	62,136	$1.10	$68,350	609,506 Direct	+11.35%	Acquired	303.2% (price as of 2026-08-20)
Oct. 31, 2014	MDXG	M	87,864	$0.70	$61,505	547,370 Direct	+19.12%	Acquired	533.6% (price as of 2026-08-20)
July 2, 2014	MDXG	M	21,429	—	—	203,571 Direct	-9.52%	Disposed	(price as of 2026-08-20)
July 2, 2014	MDXG	M	21,429	$1.23	$26,358	459,506 Direct	+4.89%	Acquired	260.6% (price as of 2026-08-20)
July 1, 2014	MDXG	M	78,571	—	—	87,864 Direct	-47.21%	Disposed	(price as of 2026-08-20)
July 1, 2014	MDXG	M	50,000	—	—	166,435 Direct	-23.10%	Disposed	(price as of 2026-08-20)
July 1, 2014	MDXG	M	78,571	$0.70	$55,000	438,077 Direct	+21.86%	Acquired	533.6% (price as of 2026-08-20)
July 1, 2014	MDXG	S 10b5-1	50,000	$7.50	$375,000	359,506 Direct	-12.21%	Disposed	-40.9% (price as of 2026-08-20)
July 1, 2014	MDXG	M	50,000	$0.70	$35,000	409,506 Direct	+13.91%	Acquired	533.6% (price as of 2026-08-20)
July 1, 2014	MDXG	S 10b5-1	98,000	$7.50	$735,000	359,506 Direct	-21.42%	Disposed	-40.9% (price as of 2026-08-20)
June 30, 2014	MDXG	S 10b5-1	2,000	$7.50	$15,000	457,506 Direct	-0.44%	Disposed	-40.9% (price as of 2026-08-20)
Feb. 25, 2014	MDXG	A	113,359	—	—	2,109,794 Direct	+5.68%	Acquired	(price as of 2026-08-20)
Feb. 25, 2014	MDXG	A	36,506	$7.24	$264,303	459,506 Direct	+8.63%	Acquired	-38.7% (price as of 2026-08-20)
Oct. 29, 2013	MDXG	A	50,000	—	—	1,996,435 Direct	+2.57%	Acquired	(price as of 2026-08-20)
Oct. 29, 2013	MDXG	A	18,000	$5.49	$98,820	423,000 Direct	+4.44%	Acquired	-19.2% (price as of 2026-08-20)
Sept. 11, 2013	MDXG	M	50,000	—	—	1,946,435 Direct	-2.50%	Disposed	(price as of 2026-08-20)
Sept. 11, 2013	MDXG	M	50,000	$0.70	$35,000	405,000 Direct	+14.08%	Acquired	533.6% (price as of 2026-08-20)
Aug. 28, 2013	MDXG	M	9,800	—	—	1,996,435 Direct	-0.49%	Disposed	(price as of 2026-08-20)
Aug. 28, 2013	MDXG	S	9,800	$6.15	$60,270	355,000 Direct	-2.69%	Disposed	-27.9% (price as of 2026-08-20)
Aug. 28, 2013	MDXG	M	9,800	$0.70	$6,860	364,800 Direct	+2.76%	Acquired	533.6% (price as of 2026-08-20)
Aug. 8, 2013	MDXG	M	200,000	—	—	2,006,235 Direct	-9.07%	Disposed	(price as of 2026-08-20)
Aug. 8, 2013	MDXG	M	200,000	$0.70	$140,000	355,000 Direct	+129.03%	Acquired	533.6% (price as of 2026-08-20)
Aug. 7, 2013	MDXG	M	83,765	—	—	2,206,235 Direct	-3.66%	Disposed	(price as of 2026-08-20)
Aug. 7, 2013	MDXG	S	83,765	$6.06	$507,616	155,000 Direct	-35.08%	Disposed	-26.8% (price as of 2026-08-20)
Aug. 7, 2013	MDXG	M	83,765	$0.70	$58,636	238,765 Direct	+54.04%	Acquired	533.6% (price as of 2026-08-20)
Aug. 6, 2013	MDXG	M	90,000	—	—	2,290,000 Direct	-3.78%	Disposed	(price as of 2026-08-20)
Aug. 6, 2013	MDXG	M	10,000	—	—	2,380,000 Direct	-0.42%	Disposed	(price as of 2026-08-20)
Aug. 6, 2013	MDXG	S	90,000	$6.34	$570,600	155,000 Direct	-36.73%	Disposed	-30.0% (price as of 2026-08-20)
Aug. 6, 2013	MDXG	M	90,000	$0.70	$63,000	245,000 Direct	+58.06%	Acquired	533.6% (price as of 2026-08-20)
Aug. 6, 2013	MDXG	S	10,000	$6.34	$63,400	155,000 Direct	-6.06%	Disposed	-30.0% (price as of 2026-08-20)
Aug. 6, 2013	MDXG	M	10,000	$0.50	$5,000	165,000 Direct	+6.45%	Acquired	787.0% (price as of 2026-08-20)
March 6, 2013	MDXG	A	55,000	$5.07	$278,850	155,000 Direct	+55.00%	Acquired	-12.5% (price as of 2026-08-20)
March 6, 2013	MDXG	A	165,000	$5.07	$836,550	2,390,000 Direct	+7.42%	Acquired	-12.5% (price as of 2026-08-20)
Oct. 31, 2012	MDXG	A	75,000	$2.94	$220,500	2,225,000 Direct	+3.49%	Acquired	50.9% (price as of 2026-08-20)
Aug. 7, 2012	MDXG	X	100,000	$0.70	$70,000	2,150,000 Direct	-4.44%	Disposed	533.6% (price as of 2026-08-20)
Aug. 7, 2012	MDXG	X	100,000	$0.70	$70,000	100,000 Direct	—	Acquired	533.6% (price as of 2026-08-20)
Aug. 7, 2012	MDXG	S	62,550	$2.23	$139,486	0 Direct	-100.00%	Disposed	98.9% (price as of 2026-08-20)
Feb. 23, 2012	MDXG	A	600,000	$1.25	$750,000	2,250,000 Direct	+36.36%	Acquired	254.8% (price as of 2026-08-20)
Dec. 14, 2011	MDXG	A	115,000	$1.10	$126,500	1,650,000 Direct	+7.49%	Acquired	303.2% (price as of 2026-08-20)
Aug. 3, 2011	MDXG	A	125,000	$1.18	$147,500	1,535,000 Direct	+8.87%	Acquired	275.8% (price as of 2026-08-20)
March 18, 2011	MDXG	A	225,000	$1.23	$276,750	1,410,000 Direct	+18.99%	Acquired	260.6% (price as of 2026-08-20)
Jan. 5, 2011	MDXG	A	75,000	—	—	1,185,000 Direct	+6.76%	Acquired	(price as of 2026-08-20)
Feb. 23, 2010	MDXG	A	350,000	—	—	350,000 Direct	—	Acquired	(price as of 2026-08-20)
Dec. 28, 2009	MDXG	P	20,850	—	—	20,850 Direct	—	Acquired	(price as of 2026-08-20)
Dec. 28, 2009	MDXG	P	41,700	$0.60	$25,020	41,700 Direct	—	Acquired	639.2% (price as of 2026-08-20)
Sept. 22, 2009	MDXG	A	750,000	—	—	760,000 Direct	+7500.00%	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
Feb. 27, 2018	MDXG	Stock Option	Common Stock (20,000)	$1.65	Feb. 23, 2020	20,000	Disposed
June 14, 2017	MDXG	Stock Option	Common Stock (13,812)	$7.24	Feb. 24, 2024	13,812	Disposed
May 10, 2017	MDXG	Stock Options	Common Stock (19,723)	$5.07	March 6, 2023	19,723	Disposed
Oct. 30, 2015	MDXG	Stock Option	Common Stock (40,606)	$1.65	Feb. 23, 2020	40,606	Disposed
May 19, 2015	MDXG	Stock Option	Common Stock (80,000)	$1.25	Feb. 23, 2022	80,000	Disposed
May 19, 2015	MDXG	Stock Option	Common Stock (20,000)	$1.65	Feb. 23, 2020	20,000	Disposed
Jan. 5, 2015	MDXG	Stock Option	Common Stock (32,342)	$1.23	March 18, 2021	32,342	Disposed
Jan. 5, 2015	MDXG	Stock Option	Common Stock (25,000)	$1.35	Jan. 5, 2021	25,000	Disposed
Oct. 31, 2014	MDXG	Stock Option	Common Stock (62,136)	$1.10	Dec. 14, 2021	62,136	Disposed
Oct. 31, 2014	MDXG	Stock Option	Common Stock (87,864)	$0.70	Sept. 22, 2019	87,864	Disposed
July 2, 2014	MDXG	Stock Option	Common Stock (21,429)	$1.23	March 18, 2021	21,429	Disposed
July 1, 2014	MDXG	Stock Option	Common Stock (78,571)	$0.70	Sept. 22, 2019	78,571	Disposed
July 1, 2014	MDXG	Stock Option	Common Stock (50,000)	$0.70	Sept. 22, 2019	50,000	Disposed
Feb. 25, 2014	MDXG	Stock Option	Common Stock (113,359)	$7.24	Feb. 24, 2024	113,359	Acquired
Oct. 29, 2013	MDXG	Stock Option	Common Stock (50,000)	$5.49	Oct. 29, 2023	50,000	Acquired
Sept. 11, 2013	MDXG	Stock Option	Common Stock (50,000)	$0.70	Sept. 22, 2019	50,000	Disposed
Aug. 28, 2013	MDXG	Stock Option	Common Stock (9,800)	$0.70	Sept. 22, 2019	9,800	Disposed
Aug. 8, 2013	MDXG	Stock Option	Common Stock (200,000)	$0.70	Sept. 22, 2019	200,000	Disposed
Aug. 7, 2013	MDXG	Stock Option	Common Stock (83,765)	$0.70	Sept. 22, 2019	83,765	Disposed
Aug. 6, 2013	MDXG	Stock Option	Common Stock (90,000)	$0.70	Sept. 22, 2019	90,000	Disposed
Aug. 6, 2013	MDXG	Stock Option	Common Stock (10,000)	$0.50	July 31, 2019	10,000	Disposed
March 6, 2013	MDXG	Stock Option	Common Stock (165,000)	$5.07	March 6, 2023	165,000	Acquired
Oct. 31, 2012	MDXG	Stock Option	Common Stock (75,000)	$2.94	Oct. 30, 2022	75,000	Acquired
Aug. 7, 2012	MDXG	Stock Option	Common Stock (100,000)	$0.70	Sept. 21, 2019	100,000	Disposed
Feb. 23, 2012	MDXG	Stock Option	Common Stock (600,000)	$1.25	Feb. 23, 2022	600,000	Acquired
Dec. 14, 2011	MDXG	Stock Option	Common Stock (115,000)	$1.10	Dec. 14, 2021	115,000	Acquired
Aug. 3, 2011	MDXG	Stock Option	Common Stock (125,000)	$1.18	Aug. 3, 2021	125,000	Acquired
March 18, 2011	MDXG	Stock Option	Common Stock (225,000)	$1.23	March 18, 2021	225,000	Acquired
Jan. 5, 2011	MDXG	Stock Option	Common Stock (75,000)	$1.35	Jan. 4, 2021	75,000	Acquired
Feb. 23, 2010	MDXG	Stock Option	Common Stock (350,000)	$1.65	Feb. 23, 2020	350,000	Acquired
Dec. 28, 2009	MDXG	Common Stock Warrants (Right to Buy)	Common Stock (20,850)	$1.50	Dec. 28, 2014	20,850	Acquired
Sept. 22, 2009	MDXG	Stock Option	Common Stock (750,000)	$0.70	Sept. 22, 2019	750,000	Acquired

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

Initial ownership (Form 3) 1 holding

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

Date	Ticker	Security	Shares	Ownership
Sept. 24, 2009	MDXG	Stock Option→ Common Stock (10,000)	10,000	Direct