Steven L Begleiter

Insider

First SEC filing: July 22, 2011 · Latest: June 12, 2026

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

Insider transactions

0 buys (P) 0 sells (S) Net: $0 + 40 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

40 other filings hidden

Date	Ticker	Code	Shares	Price	Value	Owned after	Δ own	A/D	vs now
June 10, 2026	MKTX	A	1,390	—	—	12,074 Direct	+13.01%	Acquired	(price as of 2026-08-20)
June 4, 2025	MKTX	A	784	—	—	10,684 Direct	+7.92%	Acquired	(price as of 2026-08-20)
June 5, 2024	MKTX	A	781	—	—	9,900 Direct	+8.56%	Acquired	(price as of 2026-08-20)
June 7, 2023	MKTX	A	581	—	—	9,119 Direct	+6.80%	Acquired	(price as of 2026-08-20)
Feb. 7, 2023	MKTX	S	1,000	$348.73	$348,730	8,538 Direct	-10.48%	Disposed	-53.6% (price as of 2026-08-20)
June 8, 2022	MKTX	A	497	—	—	9,538 Direct	+5.50%	Acquired	(price as of 2026-08-20)
Aug. 1, 2021	MKTX	A	300	—	—	9,041 Direct	+3.43%	Acquired	(price as of 2026-08-20)
June 11, 2020	MKTX	A	238	—	—	8,741 Direct	+2.80%	Acquired	(price as of 2026-08-20)
May 15, 2020	MKTX	G	150	—	—	8,503 Direct	-1.73%	Disposed	(price as of 2026-08-20)
July 30, 2019	MKTX	A	324	—	—	8,653 Direct	+3.89%	Acquired	(price as of 2026-08-20)
Aug. 8, 2018	MKTX	A	598	—	—	8,329 Direct	+7.74%	Acquired	(price as of 2026-08-20)
June 19, 2018	WT	A	8,936	—	—	149,607 Direct	+6.35%	Acquired	(price as of 2026-08-20)
Aug. 10, 2017	MKTX	A	518	—	—	7,731 Direct	+7.18%	Acquired	(price as of 2026-08-20)
June 20, 2017	WT	A	10,214	—	—	140,671 Direct	+7.83%	Acquired	(price as of 2026-08-20)
Aug. 3, 2016	MKTX	A	636	—	—	7,213 Direct	+9.67%	Acquired	(price as of 2026-08-20)
June 20, 2016	WT	A	9,487	—	—	130,457 Direct	+7.84%	Acquired	(price as of 2026-08-20)
June 15, 2016	MKTX	G	179	—	—	6,577 Direct	-2.65%	Disposed	(price as of 2026-08-20)
May 3, 2016	WT	J	20,054	—	—	120,970 Direct	+19.87%	Acquired	(price as of 2026-08-20)
May 3, 2016	WT	J	203,536	—	—	0 Indirect	-100.00%	Disposed	(price as of 2026-08-20)
May 3, 2016	WT	J	203,536	—	—	203,536 Indirect	—	Acquired	(price as of 2026-08-20)
May 3, 2016	WT	J	996,000	—	—	0 Indirect	-100.00%	Disposed	(price as of 2026-08-20)
Aug. 6, 2015	MKTX	A	972	—	—	6,756 Direct	+16.80%	Acquired	(price as of 2026-08-20)
June 24, 2015	WT	A	3,485	—	—	100,916 Direct	+3.58%	Acquired	(price as of 2026-08-20)
May 27, 2015	WT	P	24	$20.52	$492	97,431 Direct	+0.02%	Acquired	11.8% (price as of 2026-08-20)
March 4, 2015	WT	P	26	$18.85	$490	97,407 Direct	+0.03%	Acquired	21.7% (price as of 2026-08-20)
Aug. 8, 2014	MKTX	A	1,604	—	—	5,784 Direct	+38.37%	Acquired	(price as of 2026-08-20)
June 27, 2014	WT	A	6,672	—	—	97,381 Direct	+7.36%	Acquired	(price as of 2026-08-20)
Nov. 12, 2013	WT	J	10,084	—	—	90,709 Direct	+12.51%	Acquired	(price as of 2026-08-20)
Nov. 12, 2013	WT	J	104,379	—	—	0 Indirect	-100.00%	Disposed	(price as of 2026-08-20)
Nov. 12, 2013	WT	J	104,379	—	—	104,379 Indirect	—	Acquired	(price as of 2026-08-20)
Nov. 12, 2013	WT	J	500,000	—	—	996,000 Indirect	-33.42%	Disposed	(price as of 2026-08-20)
Aug. 2, 2013	WT	S	22,500	$13.05	$293,625	80,625 Direct	-21.82%	Disposed	75.8% (price as of 2026-08-20)
Aug. 1, 2013	WT	S	22,500	$13.15	$295,875	103,625 Direct	-17.84%	Disposed	74.4% (price as of 2026-08-20)
July 26, 2013	MKTX	A	1,627	—	—	4,180 Direct	+63.73%	Acquired	(price as of 2026-08-20)
July 24, 2013	WT	A	6,144	—	—	125,625 Direct	+5.14%	Acquired	(price as of 2026-08-20)
May 29, 2013	WT	J	49,770	—	—	119,481 Direct	+71.39%	Acquired	(price as of 2026-08-20)
May 29, 2013	WT	J	518,637	—	—	0 Indirect	-100.00%	Disposed	(price as of 2026-08-20)
May 29, 2013	WT	J	518,637	—	—	518,637 Indirect	—	Acquired	(price as of 2026-08-20)
May 29, 2013	WT	J	2,500,000	—	—	1,496,000 Indirect	-62.56%	Disposed	(price as of 2026-08-20)
May 22, 2013	WT	G	3,750	—	—	69,711 Direct	-5.10%	Disposed	(price as of 2026-08-20)
March 15, 2013	WT	S	4,000	$10.26	$41,040	3,996,000 Indirect	-0.10%	Disposed	123.6% (price as of 2026-08-20)
Feb. 13, 2013	WT	S	4,000	$10.26	$41,040	3,996,000 Indirect	-0.10%	Disposed	123.6% (price as of 2026-08-20)
Feb. 13, 2013	WT	J	73,461	—	—	73,461 Direct	—	Acquired	(price as of 2026-08-20)
Feb. 13, 2013	WT	J	779,291	—	—	0 Indirect	-100.00%	Disposed	(price as of 2026-08-20)
Feb. 13, 2013	WT	J	779,291	—	—	779,291 Indirect	—	Acquired	(price as of 2026-08-20)
Feb. 13, 2013	WT	J	4,000,000	—	—	4,000,000 Indirect	-50.00%	Disposed	(price as of 2026-08-20)
July 27, 2012	MKTX	A	2,553	—	—	2,553 Direct	—	Acquired	(price as of 2026-08-20)
Feb. 3, 2012	WT	S	277,682	$5.33	$1,480,045	8,000,000 Indirect	-3.35%	Disposed	330.4% (price as of 2026-08-20)
Feb. 2, 2012	WT	S	1,722,318	$5.33	$9,179,955	8,277,682 Indirect	-17.22%	Disposed	330.4% (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.

Initial ownership (Form 3) 1 holding

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

Date	Ticker	Security	Shares	Ownership
July 22, 2011	WT	Common Stock	10,000,000	Indirect