Stephen P Casper

CIK 1296969 · View on SEC EDGAR ↗

Insider

First SEC filing: Nov. 19, 2004 · Latest: Feb. 6, 2019

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Insider at

Insider transactions

0 buys (P) 1 sells (S) Net: $-298,544 + 44 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

44 other filings hidden
Date Ticker Code Shares Price Value Owned after Δ own A/D vs now
Sept. 8, 2025 MKTX S 1,600 $186.59 $298,544 43,208 Indirect -3.57% Disposed -13.2% (price as of 2026-08-19)
Sept. 6, 2024 MKTX S 1,000 $259.39 $259,390 9,201 Direct -9.80% Disposed -37.5% (price as of 2026-08-19)
June 7, 2024 MKTX S 500 $199.48 $99,740 10,201 Direct -4.67% Disposed -18.8% (price as of 2026-08-19)
Dec. 15, 2020 MKTX S 750 $554.96 $416,220 10,600 Direct -6.61% Disposed -70.8% (price as of 2026-08-19)
Aug. 27, 2020 MKTX S 500 $500.00 $250,000 11,350 Direct -4.22% Disposed -67.6% (price as of 2026-08-19)
May 5, 2020 MKTX S 200 $480.98 $96,196 11,567 Direct -1.70% Disposed -66.3% (price as of 2026-08-19)
May 5, 2020 MKTX S 1,400 $479.86 $671,804 11,767 Direct -10.63% Disposed -66.2% (price as of 2026-08-19)
May 5, 2020 MKTX S 200 $477.84 $95,568 13,167 Direct -1.50% Disposed -66.1% (price as of 2026-08-19)
May 5, 2020 MKTX S 200 $476.53 $95,306 13,367 Direct -1.47% Disposed -66.0% (price as of 2026-08-19)
Sept. 3, 2019 MKTX S 1,000 $402.82 $402,820 42,808 Indirect -2.28% Disposed -59.8% (price as of 2026-08-19)
June 7, 2019 MKTX S 102 $337.30 $34,405 13,055 Direct -0.78% Disposed -52.0% (price as of 2026-08-19)
Nov. 29, 2017 MKTX S 2,000 $195.84 $391,680 53,076 Direct -3.63% Disposed -17.3% (price as of 2026-08-19)
May 17, 2017 MKTX S 230 $184.70 $42,481 50,234 Direct -0.46% Disposed -12.3% (price as of 2026-08-19)
May 9, 2016 MKTX S 365 $127.69 $46,607 48,501 Direct -0.75% Disposed 26.9% (price as of 2026-08-19)
Dec. 7, 2015 MKTX S 1,500 $112.40 $168,600 43,866 Direct -3.31% Disposed 44.2% (price as of 2026-08-19)
Feb. 10, 2015 MKTX S 630 $80.35 $50,620 44,329 Direct -1.40% Disposed 101.7% (price as of 2026-08-19)
Dec. 8, 2014 MKTX S 2,000 $69.06 $138,120 39,959 Direct -4.77% Disposed 134.6% (price as of 2026-08-19)
Sept. 8, 2014 MKTX S 1,500 $59.48 $89,220 41,959 Direct -3.45% Disposed 172.4% (price as of 2026-08-19)
July 30, 2014 MKTX S 1,930 $57.05 $110,106 41,499 Direct -4.44% Disposed 184.0% (price as of 2026-08-19)
May 5, 2011 MKTX P 170 $22.20 $3,774 25,996 Direct +0.66% Acquired 629.9% (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
June 7, 2019 MKTX Stock Option (right to buy) Common Stock (3,187) $10.77 July 30, 2019 3,187 Disposed
Nov. 29, 2017 MKTX Stock Option (right to buy) Common Stock (4,225) $9.72 Aug. 1, 2018 4,225 Disposed
May 17, 2017 MKTX Employee Stock Option (right to buy) Common Stock (2,500) $16.99 Aug. 3, 2017 2,500 Disposed
May 9, 2016 MKTX Employee Stock Option (right to buy) Common Stock (5,000) $9.30 Aug. 4, 2016 5,000 Disposed
Feb. 10, 2015 MKTX Employee Stock Option (right to buy) Common Stock (5,000) $10.04 Aug. 15, 2015 5,000 Disposed
July 30, 2014 MKTX Employee Stock Option (right to buy) Common Stock (10,000) $11.00 Nov. 4, 2014 10,000 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

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
Nov. 19, 2004 MKTX Stock Option (right to buy)→ Common Stock, par value $0.003 (10,000) 10,000 Direct