Stephen P Casper
Insider
First SEC filing: Nov. 19, 2004 · Latest: Feb. 6, 2019
Insider at
Insider transactions
0 buys (P)
0 sells (S)
Net: $0
Price change vs current quote, split-adjusted for corporate actions since the filing — not benchmarked, not annualized, not size-weighted
| 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 | -12.0% (price as of 2026-10-02) |
| June 4, 2025 | MKTX | A | 784 | · | · | 9,985 Direct | +8.52% | Acquired | (price as of 2026-10-02) |
| Sept. 6, 2024 | MKTX | S | 1,000 | $259.39 | $259,390 | 9,201 Direct | -9.80% | Disposed | -36.7% (price as of 2026-10-02) |
| June 7, 2024 | MKTX | S | 500 | $199.48 | $99,740 | 10,201 Direct | -4.67% | Disposed | -17.7% (price as of 2026-10-02) |
| June 5, 2024 | MKTX | A | 781 | · | · | 10,701 Direct | +7.87% | Acquired | (price as of 2026-10-02) |
| Aug. 28, 2023 | MKTX | G | 200 | · | · | 9,920 Direct | -1.98% | Disposed | (price as of 2026-10-02) |
| June 7, 2023 | MKTX | A | 581 | · | · | 10,120 Direct | +6.09% | Acquired | (price as of 2026-10-02) |
| June 8, 2022 | MKTX | A | 586 | · | · | 9,539 Direct | +6.55% | Acquired | (price as of 2026-10-02) |
| Aug. 1, 2021 | MKTX | A | 353 | · | · | 8,953 Direct | +4.10% | Acquired | (price as of 2026-10-02) |
| March 11, 2021 | MKTX | G | 2,000 | · | · | 44,808 Indirect | +4.67% | Acquired | (price as of 2026-10-02) |
| March 11, 2021 | MKTX | G | 2,000 | · | · | 8,600 Direct | -18.87% | Disposed | (price as of 2026-10-02) |
| Dec. 15, 2020 | MKTX | S | 750 | $554.96 | $416,220 | 10,600 Direct | -6.61% | Disposed | -70.4% (price as of 2026-10-02) |
| Aug. 27, 2020 | MKTX | S | 500 | $500.00 | $250,000 | 11,350 Direct | -4.22% | Disposed | -67.2% (price as of 2026-10-02) |
| June 11, 2020 | MKTX | A | 283 | · | · | 11,850 Direct | +2.45% | Acquired | (price as of 2026-10-02) |
| May 5, 2020 | MKTX | S | 200 | $480.98 | $96,196 | 11,567 Direct | -1.70% | Disposed | -65.9% (price as of 2026-10-02) |
| May 5, 2020 | MKTX | S | 1,400 | $479.86 | $671,804 | 11,767 Direct | -10.63% | Disposed | -65.8% (price as of 2026-10-02) |
| May 5, 2020 | MKTX | S | 200 | $477.84 | $95,568 | 13,167 Direct | -1.50% | Disposed | -65.6% (price as of 2026-10-02) |
| May 5, 2020 | MKTX | S | 200 | $476.53 | $95,306 | 13,367 Direct | -1.47% | Disposed | -65.6% (price as of 2026-10-02) |
| Sept. 3, 2019 | MKTX | S | 1,000 | $402.82 | $402,820 | 42,808 Indirect | -2.28% | Disposed | -59.3% (price as of 2026-10-02) |
| July 30, 2019 | MKTX | A | 380 | · | · | 13,567 Direct | +2.88% | Acquired | (price as of 2026-10-02) |
| June 7, 2019 | MKTX | M | 3,187 | · | · | 0 Direct | -100.00% | Disposed | (price as of 2026-10-02) |
| June 7, 2019 | MKTX | S | 102 | $337.30 | $34,405 | 13,055 Direct | -0.78% | Disposed | -51.3% (price as of 2026-10-02) |
| June 7, 2019 | MKTX | M | 3,187 | $10.77 | $34,324 | 13,157 Direct | +31.97% | Acquired | 1424.0% (price as of 2026-10-02) |
| Aug. 8, 2018 | MKTX | A | 702 | · | · | 53,778 Direct | +1.32% | Acquired | (price as of 2026-10-02) |
| Nov. 29, 2017 | MKTX | M | 4,225 | · | · | 0 Direct | -100.00% | Disposed | (price as of 2026-10-02) |
| Nov. 29, 2017 | MKTX | S | 2,000 | $195.84 | $391,680 | 53,076 Direct | -3.63% | Disposed | -16.2% (price as of 2026-10-02) |
| Nov. 29, 2017 | MKTX | M | 4,225 | $9.72 | $41,067 | 55,076 Direct | +8.31% | Acquired | 1588.7% (price as of 2026-10-02) |
| Aug. 10, 2017 | MKTX | A | 617 | · | · | 50,851 Direct | +1.23% | Acquired | (price as of 2026-10-02) |
| May 17, 2017 | MKTX | M | 2,500 | · | · | 0 Direct | -100.00% | Disposed | (price as of 2026-10-02) |
| May 17, 2017 | MKTX | S | 230 | $184.70 | $42,481 | 50,234 Direct | -0.46% | Disposed | -11.1% (price as of 2026-10-02) |
| May 17, 2017 | MKTX | M | 2,500 | $16.99 | $42,475 | 50,464 Direct | +5.21% | Acquired | 866.1% (price as of 2026-10-02) |
| Dec. 29, 2016 | MKTX | G | 1,300 | · | · | 47,868 Direct | -2.64% | Disposed | (price as of 2026-10-02) |
| Aug. 3, 2016 | MKTX | A | 763 | · | · | 49,264 Direct | +1.57% | Acquired | (price as of 2026-10-02) |
| Aug. 3, 2016 | MKTX | A | 667 | · | · | 49,168 Direct | +1.38% | Acquired | (price as of 2026-10-02) |
| May 9, 2016 | MKTX | M | 5,000 | · | · | 0 Direct | -100.00% | Disposed | (price as of 2026-10-02) |
| May 9, 2016 | MKTX | S | 365 | $127.69 | $46,607 | 48,501 Direct | -0.75% | Disposed | 28.5% (price as of 2026-10-02) |
| May 9, 2016 | MKTX | M | 5,000 | $9.30 | $46,500 | 48,866 Direct | +11.40% | Acquired | 1664.9% (price as of 2026-10-02) |
| Dec. 7, 2015 | MKTX | S | 1,500 | $112.40 | $168,600 | 43,866 Direct | -3.31% | Disposed | 46.0% (price as of 2026-10-02) |
| Nov. 23, 2015 | MKTX | G | 140 | · | · | 45,366 Direct | -0.31% | Disposed | (price as of 2026-10-02) |
| Aug. 6, 2015 | MKTX | A | 1,177 | · | · | 45,506 Direct | +2.66% | Acquired | (price as of 2026-10-02) |
| Feb. 10, 2015 | MKTX | M | 5,000 | · | · | 0 Direct | -100.00% | Disposed | (price as of 2026-10-02) |
| Feb. 10, 2015 | MKTX | S | 630 | $80.35 | $50,620 | 44,329 Direct | -1.40% | Disposed | 104.3% (price as of 2026-10-02) |
| Feb. 10, 2015 | MKTX | M | 5,000 | $10.04 | $50,200 | 44,959 Direct | +12.51% | Acquired | 1534.9% (price as of 2026-10-02) |
| Dec. 8, 2014 | MKTX | S | 2,000 | $69.06 | $138,120 | 39,959 Direct | -4.77% | Disposed | 137.7% (price as of 2026-10-02) |
| Sept. 8, 2014 | MKTX | S | 1,500 | $59.48 | $89,220 | 41,959 Direct | -3.45% | Disposed | 176.0% (price as of 2026-10-02) |
| Aug. 8, 2014 | MKTX | A | 1,960 | · | · | 43,459 Direct | +4.72% | Acquired | (price as of 2026-10-02) |
| July 30, 2014 | MKTX | M | 10,000 | · | · | 0 Direct | -100.00% | Disposed | (price as of 2026-10-02) |
| July 30, 2014 | MKTX | S | 1,930 | $57.05 | $110,106 | 41,499 Direct | -4.44% | Disposed | 187.7% (price as of 2026-10-02) |
| July 30, 2014 | MKTX | M | 10,000 | $11.00 | $110,000 | 43,429 Direct | +29.91% | Acquired | 1392.2% (price as of 2026-10-02) |
| July 26, 2013 | MKTX | A | 2,010 | · | · | 33,429 Direct | +6.40% | Acquired | (price as of 2026-10-02) |
| July 27, 2012 | MKTX | A | 2,553 | · | · | 31,419 Direct | +8.84% | Acquired | (price as of 2026-10-02) |
| July 29, 2011 | MKTX | A | 2,870 | · | · | 28,866 Direct | +11.04% | Acquired | (price as of 2026-10-02) |
| May 5, 2011 | MKTX | P | 170 | $22.20 | $3,774 | 25,996 Direct | +0.66% | Acquired | 639.4% (price as of 2026-10-02) |
| July 30, 2010 | MKTX | A | 4,923 | · | · | 25,826 Direct | +23.55% | Acquired | (price as of 2026-10-02) |
| July 30, 2009 | MKTX | A | 4,178 | · | · | 20,903 Direct | +24.98% | Acquired | (price as of 2026-10-02) |
| July 30, 2009 | MKTX | M | 3,187 | · | · | 3,187 Direct | · | Acquired | (price as of 2026-10-02) |
| Aug. 1, 2008 | MKTX | A | 4,225 | · | · | 16,725 Direct | +33.80% | Acquired | (price as of 2026-10-02) |
| Aug. 1, 2008 | MKTX | A | 4,225 | · | · | 4,225 Direct | · | Acquired | (price as of 2026-10-02) |
| Aug. 3, 2007 | MKTX | M | 2,500 | · | · | 2,500 Direct | · | Acquired | (price as of 2026-10-02) |
| Aug. 3, 2007 | MKTX | A | 2,500 | · | · | 12,500 Direct | +25.00% | Acquired | (price as of 2026-10-02) |
| Aug. 4, 2006 | MKTX | M | 5,000 | · | · | 5,000 Direct | · | Acquired | (price as of 2026-10-02) |
| Aug. 4, 2006 | MKTX | A | 5,000 | · | · | 10,000 Direct | +100.00% | Acquired | (price as of 2026-10-02) |
| Aug. 15, 2005 | MKTX | M | 5,000 | $10.04 | $50,200 | 5,000 Direct | · | Acquired | 1534.9% (price as of 2026-10-02) |
| Aug. 15, 2005 | MKTX | A | 5,000 | · | · | 5,000 Direct | · | Acquired | (price as of 2026-10-02) |
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 | $10.77 | July 30, 2019 | 3,187 | Disposed |
| Nov. 29, 2017 | MKTX | Stock Option (right to buy) | Common Stock | $9.72 | Aug. 1, 2018 | 4,225 | Disposed |
| May 17, 2017 | MKTX | Employee Stock Option (right to buy) | Common Stock | $16.99 | Aug. 3, 2017 | 2,500 | Disposed |
| May 9, 2016 | MKTX | Employee Stock Option (right to buy) | Common Stock | $9.30 | Aug. 4, 2016 | 5,000 | Disposed |
| Feb. 10, 2015 | MKTX | Employee Stock Option (right to buy) | Common Stock | $10.04 | Aug. 15, 2015 | 5,000 | Disposed |
| July 30, 2014 | MKTX | Employee Stock Option (right to buy) | Common Stock | $11.00 | Nov. 4, 2014 | 10,000 | Disposed |
| July 30, 2009 | MKTX | Employee Stock Option (right to buy) | Common Stock | $10.77 | July 30, 2019 | 3,187 | Acquired |
| Aug. 1, 2008 | MKTX | Non-Qualified Stock Option (right to buy) | Common Stock | $9.72 | Aug. 1, 2018 | 4,225 | Acquired |
| Aug. 3, 2007 | MKTX | Employee Stock Option (right to buy) | Common Stock | $16.99 | Aug. 3, 2017 | 2,500 | Acquired |
| Aug. 4, 2006 | MKTX | Employee Stock Option (right to buy) | Common Stock | $9.30 | Aug. 4, 2016 | 5,000 | Acquired |
| Aug. 15, 2005 | MKTX | Employee Stock Option (right to buy) | Common Stock | $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) | 10,000 | Direct |