NEIDORFF MICHAEL F
CIK 1186257 · View on SEC EDGAR ↗
First SEC filing: Aug. 5, 2009 · Latest: Aug. 5, 2009
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Insider transactions
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 |
|---|---|---|---|---|---|---|---|---|---|
| Dec. 14, 2021 | CNC | S 10b5-1 | 23,000 | $80.11 | $1,842,530 | 6,404,073 Direct | -0.36% | Disposed | -19.9% (price as of 2026-08-21) |
| Dec. 14, 2021 | CNC | S 10b5-1 | 27,000 | $79.37 | $2,142,990 | 6,427,073 Direct | -0.42% | Disposed | -19.2% (price as of 2026-08-21) |
| Oct. 28, 2021 | CNC | S 10b5-1 | 20,000 | $70.09 | $1,401,800 | 6,525,044 Direct | -0.31% | Disposed | -8.4% (price as of 2026-08-21) |
| Nov. 9, 2020 | CNC | S 10b5-1 | 300,000 | $70.12 | $21,036,000 | 6,287,732 Direct | -4.55% | Disposed | -8.5% (price as of 2026-08-21) |
| Nov. 25, 2019 | CNC | S 10b5-1 | 100,000 | $60.23 | $6,023,000 | 6,913,390 Direct | -1.43% | Disposed | 6.5% (price as of 2026-08-21) |
| Nov. 15, 2019 | CNC | S 10b5-1 | 75,000 | $57.00 | $4,275,000 | 7,013,390 Direct | -1.06% | Disposed | 12.6% (price as of 2026-08-21) |
| April 26, 2018 | CNC | S 10b5-1 | 250,000 | $108.20 | $27,050,000 | 3,625,571 Direct | -6.45% | Disposed | 18.6% (price as of 2026-08-21) |
| July 6, 2017 | CNC | S 10b5-1 | 35,000 | $80.26 | $2,809,100 | 3,779,083 Direct | -0.92% | Disposed | 59.9% (price as of 2026-08-21) |
| June 1, 2017 | CNC | S 10b5-1 | 25,000 | $75.00 | $1,875,000 | 3,824,083 Direct | -0.65% | Disposed | 71.1% (price as of 2026-08-21) |
Showing latest 100 of 493 transactions
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 |
|---|---|---|---|---|---|---|---|
| Dec. 15, 2021 | CNC | Common Stock Option (right to buy) | Common Stock | $81.85 | Dec. 15, 2031 | 67,244 | Acquired |
| Dec. 15, 2021 | CNC | Common Stock Option (right to buy) | Common Stock (74,000) | $81.85 | Dec. 15, 2031 | 74,000 | Acquired |
| April 29, 2021 | CNC | Common Stock Option (right to buy) | Common Stock (6,666) | $59.62 | Dec. 11, 2029 | 6,666 | Disposed |
| April 29, 2021 | CNC | Common Stock Option (right to buy) | Common Stock (7,500) | $28.51 | Dec. 14, 2026 | 7,500 | Disposed |
| Dec. 15, 2020 | CNC | Common Stock Option (right to buy) | Common Stock (150,000) | $59.73 | Dec. 15, 2030 | 150,000 | Acquired |
| March 4, 2020 | CNC | Common Stock Option (right to buy) | Common Stock (20,000) | $28.51 | Dec. 14, 2026 | 12,500 | Disposed |
| Dec. 11, 2019 | CNC | Common Stock Option (right to buy) | Common Stock (20,000) | $59.62 | Dec. 11, 2029 | 20,000 | Acquired |
| Dec. 18, 2018 | CNC | Common Stock Option (right to buy) | Common Stock (10,000) | $57.02 | Dec. 14, 2026 | 10,000 | Disposed |
| Dec. 14, 2016 | CNC | Common Stock Option (right to buy) | Common Stock (20,000) | $57.02 | Dec. 14, 2026 | 20,000 | Acquired |
| Dec. 9, 2016 | CNC | Common Stock Option (right to buy) | Common Stock (127,068) | $12.60 | Dec. 12, 2016 | 127,068 | Disposed |
| Oct. 10, 2016 | CNC | Common Stock Option (right to buy) | Common Stock (25,000) | $12.60 | Dec. 12, 2016 | 25,000 | Disposed |
| Sept. 7, 2016 | CNC | Common Stock Option (right to buy) | Common Stock (10,000) | $12.60 | Dec. 12, 2016 | 10,000 | Disposed |
| July 28, 2016 | CNC | Common Stock Option (right to buy) | Common Stock (10,000) | $12.60 | Dec. 12, 2016 | 10,000 | Disposed |
| Dec. 10, 2015 | CNC | Common Stock Option (right to buy) | Common Stock (400,000) | $12.70 | Dec. 13, 2015 | 400,000 | Disposed |
| Sept. 29, 2015 | CNC | Common Stock Option (right to buy) | Common Stock (20,000) | $12.60 | Dec. 12, 2016 | 20,000 | Disposed |
| May 28, 2015 | CAL | Restricted Stock Units | Common Stock (3,173) | — | — | 3,173 | Disposed |
| May 28, 2015 | CAL | Restricted Stock Units | Common Stock (575) | — | — | 575 | Disposed |
| May 28, 2014 | CNC | Common Stock Option (right to buy) | Common Stock (70,000) | $17.85 | July 27, 2014 | 70,000 | Disposed |
| Sept. 25, 2013 | CNC | Common Stock Option (right to buy) | Common Stock (100,000) | $17.85 | July 27, 2014 | 100,000 | Disposed |
| Dec. 3, 2012 | CNC | Common Stock Option (right to buy) | Common Stock (72,759) | $13.98 | Dec. 16, 2013 | 72,759 | Disposed |
| May 1, 2012 | CNC | Common Stock Option (right to buy) | Common Stock (10,000) | $17.85 | July 27, 2014 | 10,000 | Disposed |
| March 2, 2012 | CNC | Common Stock Option (right to buy) | Common Stock (81,409) | $13.98 | Dec. 16, 2013 | 81,409 | Disposed |
| March 1, 2012 | CNC | Common Stock Option (right to buy) | Common Stock (45,832) | $13.98 | Dec. 16, 2013 | 45,832 | Disposed |
| March 1, 2012 | CNC | Common Stock Option (right to buy) | Common Stock (22,759) | $13.58 | Aug. 26, 2013 | 22,759 | Disposed |
| Feb. 29, 2012 | CNC | Common Stock Option (right to buy) | Common Stock (100,000) | $13.58 | Aug. 26, 2013 | 100,000 | Disposed |
| Jan. 30, 2012 | CNC | Common Stock Option (right to buy) | Common Stock (32,573) | $13.58 | Aug. 26, 2013 | 32,573 | Disposed |
| Jan. 28, 2012 | CAL | Phantom Stock Units [F2] | Common Stock (79) | — | — | 79 | Acquired |
| Oct. 29, 2011 | CAL | Phantom Stock Units [F2] | Common Stock (81) | — | — | 81 | Acquired |
| July 30, 2011 | CAL | Phantom Stock Units [F2] | Common Stock (75) | — | — | 75 | Acquired |
| June 3, 2011 | CNC | Common Stock Option (right to buy) | Common Stock (3,966) | $25.21 | Dec. 12, 2016 | 3,966 | Disposed |
| June 3, 2011 | CNC | Common Stock Option (right to buy) | Common Stock (25,204) | $13.58 | Aug. 26, 2013 | 25,204 | Disposed |
| April 30, 2011 | CAL | Phantom Stock Units [F2] | Common Stock (229) | — | — | 57 | Acquired |
| March 7, 2011 | CNC | Common Stock Option (right to buy) | Common Stock (210) | $7.57 | July 24, 2012 | 210 | Acquired |
| March 7, 2011 | CNC | Common Stock Option (right to buy) | Common Stock (25,000) | $13.58 | Aug. 26, 2013 | 25,000 | Acquired |
| Feb. 11, 2011 | CNC | Phantom Stock | Common Stock (3,882) | — | Feb. 11, 2011 | 3,882 | Acquired |
| Jan. 29, 2011 | CAL | Phantom Stock Units [F2] | Common Stock (57) | — | — | 57 | Acquired |
| Jan. 24, 2011 | CNC | Common Stock Option (right to buy) | Common Stock (17,500) | $13.58 | Aug. 26, 2013 | 17,500 | Acquired |
| Dec. 31, 2010 | CNC | Phantom Stock | Common Stock (345) | — | Dec. 31, 2010 | 345 | Acquired |
| Dec. 23, 2010 | CNC | Phantom Stock | Common Stock (97) | — | Dec. 23, 2010 | 97 | Acquired |
| Dec. 10, 2010 | CNC | Phantom Stock | Common Stock (106) | — | Dec. 10, 2010 | 106 | Acquired |
| Nov. 24, 2010 | CNC | Phantom Stock | Common Stock (110) | — | Nov. 24, 2010 | 110 | Acquired |
| Nov. 12, 2010 | CNC | Phantom Stock | Common Stock (115) | — | Nov. 12, 2010 | 115 | Acquired |
| Oct. 30, 2010 | CAL | Phantom Stock Units [F2] | Common Stock (62) | — | — | 62 | Acquired |
| Oct. 29, 2010 | CNC | Phantom Stock | Common Stock (113) | — | Oct. 29, 2010 | 113 | Acquired |
| Oct. 28, 2010 | CNC | Common Stock Option (right to buy) | Common Stock (5,000) | $13.58 | Aug. 26, 2013 | 5,000 | Disposed |
| Oct. 15, 2010 | CNC | Phantom Stock | Common Stock (105) | — | Oct. 15, 2010 | 105 | Acquired |
| Oct. 1, 2010 | CNC | Phantom Stock | Common Stock (108) | — | Oct. 1, 2010 | 108 | Acquired |
| Sept. 30, 2010 | CNC | Phantom Stock | Common Stock (330) | — | Sept. 30, 2010 | 330 | Acquired |
| Sept. 17, 2010 | CNC | Phantom Stock | Common Stock (116) | — | Sept. 17, 2010 | 116 | Acquired |
| Sept. 3, 2010 | CNC | Phantom Stock | Common Stock (123) | — | Sept. 3, 2010 | 123 | Acquired |
| Aug. 20, 2010 | CNC | Phantom Stock | Common Stock (124) | — | Aug. 20, 2010 | 124 | Acquired |
| Aug. 6, 2010 | CNC | Phantom Stock | Common Stock (116) | — | Aug. 6, 2010 | 116 | Acquired |
| Aug. 2, 2010 | CNC | Common Stock Option (right to buy) | Common Stock (5,000) | $13.58 | Aug. 26, 2013 | 5,000 | Disposed |
| July 31, 2010 | CAL | Phantom Stock Units [F1] | Common Stock (50) | — | — | 50 | Acquired |
| July 23, 2010 | CNC | Phantom Stock | Common Stock (123) | — | July 23, 2010 | 123 | Acquired |
| July 13, 2010 | CNC | Common Stock Option (right to buy) | Common Stock (6,000) | $13.58 | Aug. 26, 2013 | 6,000 | Disposed |
| July 9, 2010 | CNC | Phantom Stock | Common Stock (121) | — | July 9, 2010 | 121 | Acquired |
| June 30, 2010 | CNC | Phantom Stock | Common Stock (418) | — | June 30, 2010 | 418 | Acquired |
| June 25, 2010 | CNC | Phantom Stock | Common Stock (112) | — | June 25, 2010 | 112 | Acquired |
| June 11, 2010 | CNC | Phantom Stock | Common Stock (111) | — | June 11, 2010 | 111 | Acquired |
| May 28, 2010 | CNC | Phantom Stock | Common Stock (112) | — | May 28, 2010 | 112 | Acquired |
| May 14, 2010 | CNC | Phantom Stock | Common Stock (113) | — | May 14, 2010 | 113 | Acquired |
| May 10, 2010 | CNC | Common Stock Option (right to buy) | Common Stock (5,000) | $13.58 | Aug. 26, 2013 | 5,000 | Disposed |
| May 10, 2010 | CNC | Common Stock Option (right to buy) | Common Stock (10,000) | $7.57 | July 24, 2012 | 10,000 | Disposed |
| May 1, 2010 | CAL | Phantom Stock Units [F1] | Common Stock (37) | — | — | 37 | Acquired |
| April 30, 2010 | CNC | Phantom Stock | Common Stock (106) | — | April 30, 2010 | 106 | Acquired |
| April 16, 2010 | CNC | Phantom Stock | Common Stock (103) | — | April 16, 2010 | 103 | Acquired |
| April 1, 2010 | CNC | Phantom Stock | Common Stock (106) | — | April 1, 2010 | 106 | Acquired |
| March 31, 2010 | CNC | Phantom Stock | Common Stock (2,192) | — | March 31, 2010 | 2,192 | Acquired |
| March 19, 2010 | CNC | Phantom Stock | Common Stock (123) | — | March 19, 2010 | 123 | Acquired |
| March 5, 2010 | CNC | Phantom Stock | Common Stock (137) | — | March 5, 2010 | 137 | Acquired |
| Feb. 19, 2010 | CNC | Phantom Stock | Common Stock (140) | — | Feb. 19, 2010 | 140 | Acquired |
| Feb. 12, 2010 | CNC | Phantom Stock | Common Stock (5,840) | — | Feb. 12, 2010 | 5,840 | Acquired |
| Feb. 5, 2010 | CNC | Phantom Stock | Common Stock (137) | — | Feb. 5, 2010 | 137 | Acquired |
| Jan. 30, 2010 | CAL | Phantom Stock Units [F1] | Common Stock (58) | — | — | 58 | Acquired |
| Jan. 22, 2010 | CNC | Phantom Stock | Common Stock (131) | — | Jan. 22, 2010 | 131 | Acquired |
| Jan. 8, 2010 | CNC | Phantom Stock | Common Stock (112) | — | Jan. 8, 2010 | 112 | Acquired |
| Dec. 31, 2009 | CNC | Phantom Stock | Common Stock (373) | — | Dec. 31, 2009 | 373 | Acquired |
| Dec. 23, 2009 | CNC | Phantom Stock | Common Stock (107) | — | Dec. 23, 2009 | 107 | Acquired |
| Dec. 11, 2009 | CNC | Phantom Stock | Common Stock (120) | — | Dec. 11, 2009 | 120 | Acquired |
| Nov. 25, 2009 | CNC | Phantom Stock | Common Stock (122) | — | Nov. 25, 2009 | 122 | Acquired |
| Nov. 13, 2009 | CNC | Phantom Stock | Common Stock (123) | — | Nov. 13, 2009 | 123 | Acquired |
| Oct. 31, 2009 | CAL | Phantom Stock Units [F1] | Common Stock (68) | — | — | 68 | Acquired |
| Oct. 30, 2009 | CNC | Phantom Stock | Common Stock (126) | — | Oct. 30, 2009 | 126 | Acquired |
| Oct. 16, 2009 | CNC | Phantom Stock | Common Stock (125) | — | Oct. 16, 2009 | 125 | Acquired |
| Oct. 2, 2009 | CNC | Phantom Stock | Common Stock (126) | — | Oct. 2, 2009 | 126 | Acquired |
| Sept. 30, 2009 | CNC | Phantom Stock | Common Stock (358) | — | Sept. 30, 2009 | 358 | Acquired |
| Sept. 18, 2009 | CNC | Phantom Stock | Common Stock (121) | — | Sept. 18, 2009 | 121 | Acquired |
| Sept. 4, 2009 | CNC | Phantom Stock | Common Stock (132) | — | Sept. 4, 2009 | 132 | Acquired |
| Aug. 21, 2009 | CNC | Phantom Stock | Common Stock (125) | — | Aug. 21, 2009 | 125 | Acquired |
| Aug. 7, 2009 | CNC | Phantom Stock | Common Stock (128) | — | Aug. 7, 2009 | 128 | Acquired |
| July 31, 2009 | CAL | Phantom Stock Units [F1] | Common Stock (90) | — | — | 90 | Acquired |
| July 24, 2009 | CNC | Phantom Stock | Common Stock (124) | — | July 24, 2009 | 124 | Acquired |
| July 10, 2009 | CNC | Phantom Stock | Common Stock (124) | — | July 10, 2009 | 124 | Acquired |
| June 30, 2009 | CNC | Phantom Stock | Common Stock (397) | — | June 30, 2009 | 397 | Acquired |
| June 26, 2009 | CNC | Phantom Stock | Common Stock (117) | — | June 26, 2009 | 117 | Acquired |
| June 12, 2009 | CNC | Phantom Stock | Common Stock (129) | — | June 12, 2009 | 129 | Acquired |
| May 29, 2009 | CNC | Phantom Stock | Common Stock (127) | — | May 29, 2009 | 127 | Acquired |
| May 15, 2009 | CNC | Phantom Stock | Common Stock (123) | — | May 15, 2009 | 123 | Acquired |
| May 1, 2009 | CNC | Phantom Stock | Common Stock (126) | — | May 1, 2009 | 126 | Acquired |
Showing latest 100 of 223 transactions
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 |
|---|---|---|---|---|
| March 7, 2006 | CAL | No Securities Are Beneficially Owned | 0 | Direct |