David G Gomach

Insider

First SEC filing: Feb. 25, 2005 · Latest: Jan. 9, 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

Insider transactions

0 buys (P) 0 sells (S) Net: $0 + 50 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

50 other filings hidden

Date	Ticker	Code	Shares	Price	Value	Owned after	Δ own	A/D	vs now
Feb. 4, 2019	MKTX	M	3,187	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-20)
Feb. 4, 2019	MKTX	S	3,187	$215.83	$687,850	19,059 Indirect	-14.33%	Disposed	-25.0% (price as of 2026-08-20)
Feb. 4, 2019	MKTX	G	3,187	—	—	22,246 Indirect	+16.72%	Acquired	(price as of 2026-08-20)
Feb. 4, 2019	MKTX	G	3,187	—	—	299 Direct	-91.42%	Disposed	(price as of 2026-08-20)
Feb. 4, 2019	MKTX	M	3,187	$10.77	$34,324	3,486 Direct	+1065.89%	Acquired	1402.2% (price as of 2026-08-20)
Nov. 30, 2018	MKTX	G	299	—	—	19,059 Indirect	+1.59%	Acquired	(price as of 2026-08-20)
Nov. 30, 2018	MKTX	G	299	—	—	299 Direct	-50.00%	Disposed	(price as of 2026-08-20)
Aug. 8, 2018	MKTX	A	598	—	—	598 Direct	—	Acquired	(price as of 2026-08-20)
May 31, 2018	MKTX	G	259	—	—	18,760 Indirect	+1.40%	Acquired	(price as of 2026-08-20)
May 31, 2018	MKTX	G	259	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-20)
May 18, 2018	MKTX	S	700	$205.58	$143,906	18,501 Indirect	-3.65%	Disposed	-21.3% (price as of 2026-08-20)
May 18, 2018	MKTX	S	800	$204.54	$163,632	19,201 Indirect	-4.00%	Disposed	-20.9% (price as of 2026-08-20)
May 18, 2018	MKTX	S	500	$203.54	$101,770	20,001 Indirect	-2.44%	Disposed	-20.5% (price as of 2026-08-20)
May 18, 2018	MKTX	S	553	$202.18	$111,806	20,501 Indirect	-2.63%	Disposed	-20.0% (price as of 2026-08-20)
May 18, 2018	MKTX	S	2,401	$205.68	$493,838	21,054 Indirect	-10.24%	Disposed	-21.3% (price as of 2026-08-20)
May 18, 2018	MKTX	S	2,599	$204.95	$532,665	23,455 Indirect	-9.98%	Disposed	-21.1% (price as of 2026-08-20)
Feb. 5, 2018	MKTX	M	4,225	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-20)
Feb. 5, 2018	MKTX	S	523	$198.34	$103,732	26,054 Indirect	-1.97%	Disposed	-18.4% (price as of 2026-08-20)
Feb. 5, 2018	MKTX	S	3,702	$197.93	$732,737	26,577 Indirect	-12.23%	Disposed	-18.3% (price as of 2026-08-20)
Feb. 5, 2018	MKTX	M	4,225	$9.72	$41,067	30,279 Indirect	+16.22%	Acquired	1564.5% (price as of 2026-08-20)
Nov. 30, 2017	MKTX	G	259	—	—	26,054 Indirect	+1.00%	Acquired	(price as of 2026-08-20)
Nov. 30, 2017	MKTX	G	259	—	—	259 Direct	-50.00%	Disposed	(price as of 2026-08-20)
Aug. 10, 2017	MKTX	A	518	—	—	518 Direct	—	Acquired	(price as of 2026-08-20)
May 31, 2017	MKTX	G	318	—	—	25,795 Indirect	+1.25%	Acquired	(price as of 2026-08-20)
May 31, 2017	MKTX	G	318	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-20)
Feb. 7, 2017	MKTX	M	2,500	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-20)
Feb. 7, 2017	MKTX	S	2,870	$189.98	$545,243	25,477 Indirect	-10.12%	Disposed	-14.8% (price as of 2026-08-20)
Feb. 7, 2017	MKTX	S	2,500	$189.99	$474,975	28,347 Indirect	-8.10%	Disposed	-14.8% (price as of 2026-08-20)
Feb. 7, 2017	MKTX	G	2,500	—	—	30,847 Indirect	+8.82%	Acquired	(price as of 2026-08-20)
Feb. 7, 2017	MKTX	G	2,500	—	—	318 Direct	-88.72%	Disposed	(price as of 2026-08-20)
Feb. 7, 2017	MKTX	M	2,500	$16.99	$42,475	2,818 Direct	+786.16%	Acquired	852.3% (price as of 2026-08-20)
Aug. 3, 2016	MKTX	A	636	—	—	636 Direct	—	Acquired	(price as of 2026-08-20)
May 31, 2016	MKTX	G	486	—	—	28,029 Indirect	+1.76%	Acquired	(price as of 2026-08-20)
May 31, 2016	MKTX	G	486	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-20)
May 24, 2016	MKTX	S	600	$139.54	$83,724	27,543 Indirect	-2.13%	Disposed	15.9% (price as of 2026-08-20)
May 24, 2016	MKTX	S	4,323	$138.96	$600,724	28,143 Indirect	-13.32%	Disposed	16.4% (price as of 2026-08-20)
Feb. 5, 2016	MKTX	S	100	$110.36	$11,036	30,376 Indirect	-0.33%	Disposed	46.6% (price as of 2026-08-20)
Feb. 5, 2016	MKTX	S	300	$109.02	$32,706	30,476 Indirect	-0.97%	Disposed	48.4% (price as of 2026-08-20)
Feb. 5, 2016	MKTX	S	500	$108.17	$54,085	30,776 Indirect	-1.60%	Disposed	49.6% (price as of 2026-08-20)
Feb. 5, 2016	MKTX	S	1,600	$106.99	$171,184	31,276 Indirect	-4.87%	Disposed	51.2% (price as of 2026-08-20)
Aug. 13, 2015	MKTX	M	5,000	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-20)
Aug. 13, 2015	MKTX	S	1,496	$95.71	$143,182	2,576 Direct	-36.74%	Disposed	69.0% (price as of 2026-08-20)
Aug. 13, 2015	MKTX	S	3,504	$94.95	$332,705	4,072 Direct	-46.25%	Disposed	70.4% (price as of 2026-08-20)
Aug. 13, 2015	MKTX	M	5,000	$9.30	$46,500	7,576 Direct	+194.10%	Acquired	1639.7% (price as of 2026-08-20)
Aug. 6, 2015	MKTX	A	972	—	—	2,576 Direct	+60.60%	Acquired	(price as of 2026-08-20)
Feb. 12, 2015	MKTX	S	4,000	$81.43	$325,720	32,876 Indirect	-10.85%	Disposed	98.7% (price as of 2026-08-20)
Aug. 12, 2014	MKTX	S	5,000	$56.52	$282,600	36,876 Indirect	-11.94%	Disposed	186.3% (price as of 2026-08-20)
Aug. 12, 2014	MKTX	M	5,000	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-20)
Aug. 12, 2014	MKTX	M	5,000	$10.04	$50,200	41,876 Indirect	+13.56%	Acquired	1511.5% (price as of 2026-08-20)
Aug. 8, 2014	MKTX	A	1,604	—	—	38,480 Direct	+4.35%	Acquired	(price as of 2026-08-20)
Dec. 20, 2013	MKTX	G	1,000	—	—	36,876 Direct	-2.64%	Disposed	(price as of 2026-08-20)
July 30, 2013	MKTX	M	5,000	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-20)
July 30, 2013	MKTX	S	5,000	$52.20	$261,000	37,876 Direct	-11.66%	Disposed	209.9% (price as of 2026-08-20)
July 30, 2013	MKTX	M	5,000	$13.70	$68,500	42,876 Direct	+13.20%	Acquired	1080.9% (price as of 2026-08-20)
July 26, 2013	MKTX	A	1,627	—	—	37,876 Direct	+4.49%	Acquired	(price as of 2026-08-20)
July 27, 2012	MKTX	A	2,553	—	—	36,249 Direct	+7.58%	Acquired	(price as of 2026-08-20)
July 29, 2011	MKTX	A	2,870	—	—	33,696 Direct	+9.31%	Acquired	(price as of 2026-08-20)
July 30, 2010	MKTX	A	4,923	—	—	30,826 Direct	+19.01%	Acquired	(price as of 2026-08-20)
July 30, 2009	MKTX	M	3,187	—	—	3,187 Direct	—	Acquired	(price as of 2026-08-20)
July 30, 2009	MKTX	A	4,178	—	—	25,903 Direct	+19.23%	Acquired	(price as of 2026-08-20)
Nov. 3, 2008	MKTX	P	500	$5.65	$2,825	21,725 Direct	+2.36%	Acquired	2763.5% (price as of 2026-08-20)
Nov. 3, 2008	MKTX	P	2,500	$5.60	$14,000	21,225 Direct	+13.35%	Acquired	2789.1% (price as of 2026-08-20)
Nov. 3, 2008	MKTX	P	500	$5.55	$2,775	18,725 Direct	+2.74%	Acquired	2815.1% (price as of 2026-08-20)
Nov. 3, 2008	MKTX	P	1,500	$5.50	$8,250	18,225 Direct	+8.97%	Acquired	2841.6% (price as of 2026-08-20)
Aug. 1, 2008	MKTX	A	4,225	—	—	4,225 Direct	—	Acquired	(price as of 2026-08-20)
Aug. 1, 2008	MKTX	A	4,225	—	—	16,725 Direct	+33.80%	Acquired	(price as of 2026-08-20)
Aug. 3, 2007	MKTX	M	2,500	—	—	2,500 Direct	—	Acquired	(price as of 2026-08-20)
Aug. 3, 2007	MKTX	A	2,500	—	—	12,500 Direct	+25.00%	Acquired	(price as of 2026-08-20)
Aug. 4, 2006	MKTX	M	5,000	—	—	5,000 Direct	—	Acquired	(price as of 2026-08-20)
Aug. 4, 2006	MKTX	A	5,000	—	—	10,000 Direct	+100.00%	Acquired	(price as of 2026-08-20)
Aug. 15, 2005	MKTX	A	5,000	—	—	5,000 Direct	—	Acquired	(price as of 2026-08-20)
Aug. 15, 2005	MKTX	M	5,000	$10.04	$50,200	5,000 Direct	—	Acquired	1511.5% (price as of 2026-08-20)
June 14, 2004	CME	A	5,600	—	—	5,600 Direct	—	Acquired	(price as of 2026-08-20)
June 14, 2004	CME	A	800	—	—	3,290 Direct	+32.13%	Acquired	(price as of 2026-08-20)
Nov. 13, 2003	CME	M	15,000	$22.00	$330,000	70,000 Direct	-17.65%	Disposed	6015.9% (price as of 2026-08-20)
Nov. 13, 2003	CME	S	15,000	$67.00	$1,005,000	2,490 Direct	-85.76%	Disposed	1908.2% (price as of 2026-08-20)
Nov. 13, 2003	CME	M	15,000	$22.00	$330,000	0 Direct	—	Acquired	6015.9% (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. 4, 2019	MKTX	Stock Option (right to buy)	Common Stock (3,187)	$10.77	July 30, 2019	3,187	Disposed
Feb. 5, 2018	MKTX	Stock Option (right to buy)	Common Stock (4,225)	$9.72	Aug. 1, 2018	4,225	Disposed
Feb. 7, 2017	MKTX	Employee Stock Option (right to buy)	Common Stock (2,500)	$16.99	Aug. 3, 2017	2,500	Disposed
Aug. 13, 2015	MKTX	Employee Stock Option (right to buy)	Common Stock (5,000)	$9.30	Aug. 4, 2016	5,000	Disposed
Aug. 12, 2014	MKTX	Employee Stock Option (right to buy)	Common Stock (5,000)	$10.04	Aug. 15, 2015	5,000	Disposed
July 30, 2013	MKTX	Employee Stock Option (right to buy)	Common Stock (5,000)	$13.70	Feb. 17, 2015	5,000	Disposed
July 30, 2009	MKTX	Employee Stock Option (right to buy)	Common Stock (3,187)	$10.77	July 30, 2019	3,187	Acquired
Aug. 1, 2008	MKTX	Non-Qualified Stock Option (right to buy)	Common Stock (4,225)	$9.72	Aug. 1, 2018	4,225	Acquired
Aug. 3, 2007	MKTX	Employee Stock Option (right to buy)	Common Stock (2,500)	$16.99	Aug. 3, 2017	2,500	Acquired
Aug. 4, 2006	MKTX	Employee Stock Option (right to buy)	Common Stock (5,000)	$9.30	Aug. 4, 2016	5,000	Acquired
Aug. 15, 2005	MKTX	Employee Stock Option (right to buy)	Common Stock (5,000)	$10.04	Aug. 15, 2015	5,000	Acquired
June 14, 2004	CME	Stock Options (Right to buy)	Common Stock Class A (5,600)	$127.00	June 14, 2014	5,600	Acquired
Nov. 13, 2003	CME	Employee Stock Option (right to buy)	Class A Common Stock (15,000)	$22.00	May 7, 2011	15,000	Disposed

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
Feb. 25, 2005	MKTX	Stock Option (right to buy)→ Common Stock, par value $0.003 per share. (5,000)	5,000	Direct