Charles E Koob

Insider

First SEC filing: Feb. 27, 2012 · Latest: Feb. 8, 2019

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

Insider transactions

0 buys (P) 0 sells (S) Net: $0 + 43 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

43 other filings hidden

Date	Ticker	Code	Shares	Price	Value	Owned after	Δ own	A/D	vs now
Oct. 2, 2020	MDXG	A	26,236	$6.67	$174,994	1,431,525 Indirect	+1.87%	Acquired	-33.1% (price as of 2026-08-19)
Sept. 21, 2020	MDXG	G	50,000	—	—	1,455,289 Indirect	-3.32%	Disposed	(price as of 2026-08-19)
Sept. 21, 2020	MDXG	G	50,000	—	—	1,405,289 Indirect	-3.44%	Disposed	(price as of 2026-08-19)
Aug. 5, 2020	MDXG	A	29,661	—	—	1,505,289 Indirect	+2.01%	Acquired	(price as of 2026-08-19)
Jan. 22, 2020	MDXG	M	15,000	$1.20	$18,000	15,000 Direct	—	Acquired	271.7% (price as of 2026-08-19)
Jan. 22, 2020	MDXG	J	15,000	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-19)
Jan. 22, 2020	MDXG	J	15,000	—	—	1,475,628 Indirect	+1.03%	Acquired	(price as of 2026-08-19)
Jan. 22, 2020	MDXG	M	15,000	$1.20	$18,000	0 Direct	-100.00%	Disposed	271.7% (price as of 2026-08-19)
July 9, 2019	MDXG	J	723,154	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-19)
July 9, 2019	MDXG	J	723,154	—	—	1,460,628 Indirect	+98.06%	Acquired	(price as of 2026-08-19)
May 17, 2017	MDXG	A	12,153	—	—	1,324,459 Direct	+0.93%	Acquired	(price as of 2026-08-19)
May 1, 2017	MDXG	J	140,168	$13.14	$1,841,808	140,168 Indirect	—	Acquired	-66.1% (price as of 2026-08-19)
March 13, 2017	MDXG	S	50,486	$8.50	$429,131	1,312,306 Direct	-3.70%	Disposed	-47.5% (price as of 2026-08-19)
May 18, 2016	MDXG	A	21,429	—	—	1,502,960 Direct	+1.45%	Acquired	(price as of 2026-08-19)
May 14, 2015	MDXG	A	12,878	—	—	1,481,531 Direct	+0.88%	Acquired	(price as of 2026-08-19)
July 28, 2014	MDXG	A	15,000	—	—	15,000 Direct	—	Acquired	(price as of 2026-08-19)
July 28, 2014	MDXG	A	9,000	—	—	1,468,653 Direct	+0.62%	Acquired	(price as of 2026-08-19)
June 5, 2013	MDXG	M	50,000	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-19)
June 5, 2013	MDXG	M	50,000	$1.00	$50,000	1,459,653 Direct	+3.55%	Acquired	346.0% (price as of 2026-08-19)
May 9, 2013	MDXG	A	15,000	$6.60	$99,000	60,000 Direct	+33.33%	Acquired	-32.4% (price as of 2026-08-19)
May 9, 2013	MDXG	A	5,000	$6.60	$33,000	1,409,653 Direct	+0.36%	Acquired	-32.4% (price as of 2026-08-19)
Oct. 31, 2012	MDXG	A	15,000	$2.94	$44,100	45,000 Direct	+50.00%	Acquired	51.7% (price as of 2026-08-19)
Oct. 31, 2012	MDXG	A	15,000	$2.94	$44,100	65,000 Direct	+30.00%	Acquired	51.7% (price as of 2026-08-19)
Oct. 17, 2012	CLPT	A	8,594	$2.40	$20,626	508,885 Direct	+1.72%	Acquired	-83.5% (price as of 2026-08-19)
Sept. 4, 2012	CLPT	G	50,000	—	—	500,291 Direct	-9.09%	Disposed	(price as of 2026-08-19)
Aug. 17, 2012	CLPT	X	50,000	$0.01	$500	550,291 Direct	+9.99%	Acquired	3865.0% (price as of 2026-08-19)
Aug. 17, 2012	CLPT	X	50,000	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-19)
July 27, 2012	MDXG	X	25,243	$1.50	$37,864	50,000 Direct	-33.55%	Disposed	197.3% (price as of 2026-08-19)
July 27, 2012	MDXG	X	25,243	$1.50	$37,864	1,404,653 Direct	+1.83%	Acquired	197.3% (price as of 2026-08-19)
April 13, 2012	CLPT	A	45,000	—	—	45,000 Direct	—	Acquired	(price as of 2026-08-19)
March 27, 2012	MDXG	X	12,622	$0.01	$126	75,243 Direct	-14.37%	Disposed	44500.0% (price as of 2026-08-19)
March 27, 2012	MDXG	X	12,622	$0.01	$126	1,379,410 Direct	+0.92%	Acquired	44500.0% (price as of 2026-08-19)
March 9, 2012	MDXG	A	12,622	$0.01	$126	87,865 Direct	+16.77%	Acquired	44500.0% (price as of 2026-08-19)
Feb. 14, 2012	MDXG	X	100,000	$1.00	$100,000	30,000 Direct	—	Acquired	346.0% (price as of 2026-08-19)
Feb. 14, 2012	MDXG	X	100,000	$1.00	$100,000	1,366,788 Direct	+7.89%	Acquired	346.0% (price as of 2026-08-19)
Jan. 31, 2012	MDXG	A	38,813	$1.10	$42,694	1,266,788 Direct	+3.16%	Acquired	305.5% (price as of 2026-08-19)
Dec. 14, 2011	MDXG	A	15,000	$1.10	$16,500	130,000 Direct	+13.04%	Acquired	305.5% (price as of 2026-08-19)
Dec. 31, 2010	MDXG	P	25,243	$1.50	$37,864	190,243 Direct	+15.30%	Acquired	197.3% (price as of 2026-08-19)
Dec. 31, 2010	MDXG	P	50,486	$0.99	$49,981	1,227,975 Direct	+4.29%	Acquired	350.5% (price as of 2026-08-19)
Oct. 20, 2010	MDXG	P	50,000	$1.00	$50,000	165,000 Direct	+43.48%	Acquired	346.0% (price as of 2026-08-19)
May 11, 2010	MDXG	A	15,000	—	—	15,000 Direct	—	Acquired	(price as of 2026-08-19)
March 31, 2010	MDXG	C	300,000	$150000.00	$45,000,000,000	0 Direct	-100.00%	Disposed	-100.0% (price as of 2026-08-19)
March 31, 2010	MDXG	A	308,821	$0.50	$154,410	308,821 Direct	—	Acquired	792.0% (price as of 2026-08-19)
Nov. 19, 2009	MDXG	P	15,000	$0.50	$7,500	868,668 Direct	+1.76%	Acquired	792.0% (price as of 2026-08-19)
Oct. 19, 2009	MDXG	P	16,668	$0.45	$7,501	853,668 Direct	+1.99%	Acquired	891.1% (price as of 2026-08-19)
Aug. 20, 2009	MDXG	A	37,000	—	—	837,000 Direct	+4.62%	Acquired	(price as of 2026-08-19)
June 4, 2009	MDXG	A	100,000	$0.50	$50,000	200,000 Direct	+100.00%	Acquired	792.0% (price as of 2026-08-19)
April 7, 2009	MDXG	A	None	$150000.00	—	— Direct	—	Acquired	-100.0% (price as of 2026-08-19)
Feb. 20, 2009	MDXG	A	100,000	$1.00	$100,000	100,000 Direct	—	Acquired	346.0% (price as of 2026-08-19)

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
Jan. 22, 2020	MDXG	Stock Option	Common Stock (15,000)	$1.20	May 10, 2020	15,000	Disposed
July 28, 2014	MDXG	Stock Option	Common Stock (15,000)	$6.28	July 27, 2024	15,000	Acquired
June 5, 2013	MDXG	Warrant	Common Stock (50,000)	$1.00	Oct. 21, 2013	50,000	Disposed
May 9, 2013	MDXG	Stock Option	Common Stock (15,000)	$6.60	May 8, 2023	15,000	Acquired
Oct. 31, 2012	MDXG	Stock Option	Common Stock (15,000)	$2.94	Oct. 30, 2022	15,000	Acquired
Oct. 31, 2012	MDXG	Stock Option	Common Stock (15,000)	$2.94	Oct. 30, 2022	15,000	Acquired
Aug. 17, 2012	CLPT	Warrants (right to buy)	Common Stock (50,000)	$0.01	Sept. 14, 2013	50,000	Disposed
July 27, 2012	MDXG	Warrant	Common Stock (25,243)	$1.50	Aug. 3, 2012	25,243	Disposed
April 13, 2012	CLPT	Stock Option (right to buy)	Common Stock (45,000)	$1.00	April 13, 2022	45,000	Acquired
March 27, 2012	MDXG	Warrant	Common Stock (12,622)	$0.01	Dec. 31, 2015	12,622	Disposed
March 9, 2012	MDXG	Warrant	Common Stock (12,622)	$0.01	Dec. 31, 2015	12,622	Acquired
Feb. 14, 2012	MDXG	Stock Option	Common Stock (100,000)	$1.00	Feb. 14, 2012	100,000	Acquired
Dec. 14, 2011	MDXG	Stock Option	Common Stock (15,000)	$1.10	Dec. 14, 2021	15,000	Acquired
Dec. 31, 2010	MDXG	Warrant	Common Stock (25,243)	$1.50	Dec. 31, 2015	25,243	Acquired
Oct. 20, 2010	MDXG	Warrant	Common Stock (50,000)	$1.00	Oct. 20, 2013	50,000	Acquired
May 11, 2010	MDXG	Stock Option	Common Stock (15,000)	$1.20	May 11, 2020	15,000	Acquired
March 31, 2010	MDXG	3% Convertible Senior Secured Promissory Note	Common Stock (300,000)	$0.50	April 7, 2012	300,000	Disposed
April 7, 2009	MDXG	3% Convertible Senior Secured Promissory Notes	Common Stock (300,000)	$0.50	April 7, 2012	—	Acquired

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

Initial ownership (Form 3) 10 holdings

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

Date	Ticker	Security	Shares	Ownership
Feb. 27, 2012	CLPT	Common Stock	20,000	Indirect
Feb. 27, 2012	CLPT	Common Stock	480,291	Direct
Feb. 27, 2012	CLPT	Warrants (right to buy)→ Common Stock (50,000)	50,000	Direct
Feb. 27, 2012	CLPT	Stock Option (right to buy)→ Common Stock (3,750)	3,750	Direct
Feb. 27, 2012	CLPT	Stock Option (right to buy)→ Common Stock (2,500)	2,500	Direct
Feb. 27, 2012	CLPT	Stock Option (right to buy)→ Common Stock (2,500)	2,500	Direct
Feb. 27, 2012	CLPT	Stock Option (right to buy)→ Common Stock (38,000)	38,000	Direct
Feb. 27, 2012	CLPT	Stock Option (right to buy)→ Common Stock (12,000)	12,000	Direct
Feb. 15, 2008	MDXG	Series A Preferred Stock [F1]	120,000	Indirect
Feb. 15, 2008	MDXG	Stock option→ Common Stock (309,142)	309,142	Direct