Thomas Kirk Walker
Insider
First SEC filing: Oct. 19, 2004 · Latest: Oct. 11, 2013
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 |
|---|---|---|---|---|---|---|---|---|---|
| Dec. 11, 2013 | COST | G | 445 | · | · | 249,743 Direct | -0.18% | Disposed | (price as of 2026-10-02) |
| Oct. 22, 2013 | COST | F | 4,515 | $117.81 | $531,912 | 248,281 Direct | -1.79% | Disposed | 681.5% (price as of 2026-10-02) |
| Oct. 22, 2013 | COST | F | 3,765 | $117.81 | $443,555 | 252,796 Direct | -1.47% | Disposed | 681.5% (price as of 2026-10-02) |
| Oct. 22, 2013 | COST | F | 3,011 | $117.81 | $354,726 | 256,561 Direct | -1.16% | Disposed | 681.5% (price as of 2026-10-02) |
| Oct. 22, 2013 | COST | F | 2,258 | $117.81 | $266,015 | 259,572 Direct | -0.86% | Disposed | 681.5% (price as of 2026-10-02) |
| Oct. 22, 2013 | COST | F | 1,505 | $117.81 | $177,304 | 261,830 Direct | -0.57% | Disposed | 681.5% (price as of 2026-10-02) |
| Sept. 20, 2013 | COST | A | 1,907 | $117.94 | $224,912 | 265,242 Direct | +0.72% | Acquired | 680.6% (price as of 2026-10-02) |
| Sept. 20, 2013 | COST | F | 2,541 | $117.94 | $299,686 | 263,335 Direct | -0.96% | Disposed | 680.6% (price as of 2026-10-02) |
| Sept. 20, 2013 | COST | A | 25,000 | · | · | 265,876 Direct | +10.38% | Acquired | (price as of 2026-10-02) |
| Dec. 12, 2012 | COST | A | 2,541 | $98.31 | $249,806 | 265,376 Direct | +0.97% | Acquired | 836.5% (price as of 2026-10-02) |
| Oct. 22, 2012 | COST | F | 1,215 | $95.00 | $115,425 | 262,835 Direct | -0.46% | Disposed | 869.1% (price as of 2026-10-02) |
| Oct. 22, 2012 | COST | F | 1,215 | $95.00 | $115,425 | 264,050 Direct | -0.46% | Disposed | 869.1% (price as of 2026-10-02) |
| Oct. 22, 2012 | COST | F | 1,215 | $95.00 | $115,425 | 265,265 Direct | -0.46% | Disposed | 869.1% (price as of 2026-10-02) |
| Oct. 22, 2012 | COST | F | 1,215 | $95.00 | $115,425 | 266,480 Direct | -0.45% | Disposed | 869.1% (price as of 2026-10-02) |
| Oct. 17, 2012 | COST | F | 1,650 | $96.78 | $159,687 | 267,695 Direct | -0.61% | Disposed | 851.3% (price as of 2026-10-02) |
| Sept. 26, 2012 | COST | F | 2,205 | $101.00 | $222,705 | 269,345 Direct | -0.81% | Disposed | 811.5% (price as of 2026-10-02) |
| Sept. 26, 2012 | COST | A | 25,000 | · | · | 271,550 Direct | +10.14% | Acquired | (price as of 2026-10-02) |
| Oct. 22, 2011 | COST | F | 1,215 | $85.30 | $103,640 | 246,550 Direct | -0.49% | Disposed | 979.3% (price as of 2026-10-02) |
| Oct. 22, 2011 | COST | F | 1,215 | $85.30 | $103,640 | 247,765 Direct | -0.49% | Disposed | 979.3% (price as of 2026-10-02) |
| Oct. 22, 2011 | COST | F | 1,215 | $85.30 | $103,640 | 248,980 Direct | -0.49% | Disposed | 979.3% (price as of 2026-10-02) |
| Oct. 19, 2011 | COST | F | 1,795 | $84.38 | $151,462 | 250,195 Direct | -0.71% | Disposed | 991.1% (price as of 2026-10-02) |
| Oct. 17, 2011 | COST | F | 1,773 | $82.36 | $146,024 | 251,990 Direct | -0.70% | Disposed | 1017.8% (price as of 2026-10-02) |
| Oct. 14, 2011 | COST | M | 44,000 | $43.79 | $1,926,760 | 0 Direct | -100.00% | Disposed | 2002.4% (price as of 2026-10-02) |
| Oct. 14, 2011 | COST | S | 44,000 | · | · | 253,763 Direct | -14.78% | Disposed | (price as of 2026-10-02) |
| Oct. 14, 2011 | COST | M | 44,000 | $43.79 | $1,926,760 | 297,763 Direct | +17.34% | Acquired | 2002.4% (price as of 2026-10-02) |
| Sept. 28, 2011 | COST | F | 2,206 | $83.79 | $184,841 | 228,763 Direct | -0.96% | Disposed | 998.8% (price as of 2026-10-02) |
| Sept. 28, 2011 | COST | A | 25,000 | · | · | 253,763 Direct | +10.93% | Acquired | (price as of 2026-10-02) |
| Sept. 28, 2011 | COST | F | 2,206 | $83.79 | $184,841 | 228,763 Direct | -0.96% | Disposed | 998.8% (price as of 2026-10-02) |
| April 12, 2011 | COST | F | 634 | $76.45 | $48,469 | 230,969 Direct | -0.27% | Disposed | 1104.3% (price as of 2026-10-02) |
| Oct. 22, 2010 | COST | F | 1,215 | $64.03 | $77,796 | 234,003 Direct | -0.52% | Disposed | 1337.8% (price as of 2026-10-02) |
| Oct. 22, 2010 | COST | F | 1,215 | $64.03 | $77,796 | 235,218 Direct | -0.51% | Disposed | 1337.8% (price as of 2026-10-02) |
| Oct. 19, 2010 | COST | F | 1,777 | $62.21 | $110,547 | 236,433 Direct | -0.75% | Disposed | 1379.9% (price as of 2026-10-02) |
| Oct. 17, 2010 | COST | F | 1,750 | $63.70 | $111,475 | 238,210 Direct | -0.73% | Disposed | 1345.3% (price as of 2026-10-02) |
| Oct. 8, 2010 | COST | M | 12,000 | $33.75 | $405,000 | 0 Direct | -100.00% | Disposed | 2627.9% (price as of 2026-10-02) |
| Oct. 8, 2010 | COST | M | 31,000 | $43.79 | $1,357,490 | 44,000 Direct | -41.33% | Disposed | 2002.4% (price as of 2026-10-02) |
| Oct. 8, 2010 | COST | S | 43,000 | · | · | 217,165 Direct | -16.53% | Disposed | (price as of 2026-10-02) |
| Oct. 8, 2010 | COST | M | 12,000 | $33.75 | $405,000 | 260,165 Direct | +4.84% | Acquired | 2627.9% (price as of 2026-10-02) |
| Oct. 8, 2010 | COST | M | 31,000 | $43.79 | $1,357,490 | 248,165 Direct | +14.27% | Acquired | 2002.4% (price as of 2026-10-02) |
| Oct. 7, 2010 | COST | F | 2,205 | $65.26 | $143,898 | 239,960 Direct | -0.91% | Disposed | 1310.7% (price as of 2026-10-02) |
| Oct. 7, 2010 | COST | A | 25,000 | · | · | 242,165 Direct | +11.51% | Acquired | (price as of 2026-10-02) |
| April 12, 2010 | COST | F | 625 | $60.35 | $37,719 | 217,165 Direct | -0.29% | Disposed | 1425.5% (price as of 2026-10-02) |
| Oct. 22, 2009 | COST | F | 1,216 | $58.27 | $70,856 | 223,746 Direct | -0.54% | Disposed | 1480.0% (price as of 2026-10-02) |
| Oct. 19, 2009 | COST | F | 1,750 | $59.23 | $103,652 | 224,962 Direct | -0.77% | Disposed | 1454.4% (price as of 2026-10-02) |
| Oct. 17, 2009 | COST | F | 1,750 | $58.48 | $102,340 | 226,712 Direct | -0.77% | Disposed | 1474.3% (price as of 2026-10-02) |
| Oct. 13, 2009 | COST | M | 75,000 | $37.35 | $2,801,250 | 0 Direct | -100.00% | Disposed | 2364.9% (price as of 2026-10-02) |
| Oct. 13, 2009 | COST | S | 75,000 | · | · | 228,462 Direct | -24.71% | Disposed | (price as of 2026-10-02) |
| Oct. 13, 2009 | COST | M | 75,000 | $37.35 | $2,801,250 | 303,462 Direct | +32.83% | Acquired | 2364.9% (price as of 2026-10-02) |
| Oct. 13, 2009 | COST | S | 75,000 | · | · | 153,462 Direct | -32.83% | Disposed | (price as of 2026-10-02) |
| Oct. 12, 2009 | COST | F | 2,205 | $58.03 | $127,956 | 228,462 Direct | -0.96% | Disposed | 1486.5% (price as of 2026-10-02) |
| Oct. 12, 2009 | COST | A | 25,000 | · | · | 230,667 Direct | +12.16% | Acquired | (price as of 2026-10-02) |
| April 12, 2009 | COST | F | 629 | $46.90 | $29,500 | 205,667 Direct | -0.30% | Disposed | 1863.0% (price as of 2026-10-02) |
| Oct. 19, 2008 | COST | F | 1,806 | $57.98 | $104,712 | 206,296 Direct | -0.87% | Disposed | 1487.9% (price as of 2026-10-02) |
| Oct. 17, 2008 | COST | F | 1,823 | $57.98 | $105,698 | 208,102 Direct | -0.87% | Disposed | 1487.9% (price as of 2026-10-02) |
| Oct. 17, 2008 | COST | A | 25,000 | · | · | 209,925 Direct | +13.52% | Acquired | (price as of 2026-10-02) |
| Aug. 12, 2008 | COST | A | 25 | · | · | 184,925 Direct | +0.01% | Acquired | (price as of 2026-10-02) |
| April 12, 2008 | COST | F | 884 | $65.70 | $58,079 | 184,900 Direct | -0.48% | Disposed | 1301.3% (price as of 2026-10-02) |
| March 27, 2008 | COST | M | 12,000 | $33.75 | $405,000 | 12,000 Direct | -50.00% | Disposed | 2627.9% (price as of 2026-10-02) |
| March 27, 2008 | COST | M | 36,000 | $39.25 | $1,413,000 | 0 Direct | -100.00% | Disposed | 2245.6% (price as of 2026-10-02) |
| March 27, 2008 | COST | M | 12,000 | $30.41 | $364,920 | 0 Direct | -100.00% | Disposed | 2927.5% (price as of 2026-10-02) |
| March 27, 2008 | COST | S | 60,000 | · | · | 185,784 Direct | -24.41% | Disposed | (price as of 2026-10-02) |
| March 27, 2008 | COST | M | 12,000 | $33.75 | $405,000 | 245,784 Direct | +5.13% | Acquired | 2627.9% (price as of 2026-10-02) |
| March 27, 2008 | COST | M | 12,000 | $30.41 | $364,920 | 233,784 Direct | +5.41% | Acquired | 2927.5% (price as of 2026-10-02) |
| March 27, 2008 | COST | M | 36,000 | $39.25 | $1,413,000 | 221,784 Direct | +19.38% | Acquired | 2245.6% (price as of 2026-10-02) |
| Oct. 19, 2007 | COST | F | 1,823 | $65.70 | $119,771 | 210,784 Direct | -0.86% | Disposed | 1301.3% (price as of 2026-10-02) |
| April 12, 2007 | COST | F | 912 | $54.68 | $49,868 | 187,607 Direct | -0.48% | Disposed | 1583.7% (price as of 2026-10-02) |
| Feb. 12, 2007 | COST | M | 24,000 | $33.75 | $810,000 | 140,519 Direct | +20.60% | Acquired | 2627.9% (price as of 2026-10-02) |
| Feb. 12, 2007 | COST | M | 24,000 | $33.75 | $810,000 | 24,000 Direct | -50.00% | Disposed | 2627.9% (price as of 2026-10-02) |
| Feb. 12, 2007 | COST | M | 24,000 | $38.79 | $930,960 | 0 Direct | -100.00% | Disposed | 2273.4% (price as of 2026-10-02) |
| Feb. 12, 2007 | COST | S | 48,000 | $55.82 | $2,679,360 | 188,519 Direct | -20.29% | Disposed | 1549.3% (price as of 2026-10-02) |
| Feb. 12, 2007 | COST | M | 24,000 | $38.79 | $930,960 | 164,519 Direct | +17.08% | Acquired | 2273.4% (price as of 2026-10-02) |
| Jan. 12, 2007 | COST | M | 24,000 | $33.75 | $810,000 | 24,000 Direct | -50.00% | Disposed | 2627.9% (price as of 2026-10-02) |
| Jan. 12, 2007 | COST | M | 24,000 | $38.79 | $930,960 | 0 Direct | -100.00% | Disposed | 2273.4% (price as of 2026-10-02) |
| Jan. 12, 2007 | COST | S | 48,000 | $55.82 | $2,679,360 | 188,519 Direct | -20.29% | Disposed | 1549.3% (price as of 2026-10-02) |
| Jan. 12, 2007 | COST | M | 24,000 | $38.79 | $930,960 | 236,519 Direct | +11.29% | Acquired | 2273.4% (price as of 2026-10-02) |
| Jan. 12, 2007 | COST | M | 24,000 | $33.75 | $810,000 | 212,519 Direct | +12.73% | Acquired | 2627.9% (price as of 2026-10-02) |
| Oct. 19, 2006 | COST | A | 25,000 | · | · | 188,894 Direct | +15.25% | Acquired | (price as of 2026-10-02) |
| June 12, 2006 | COST | A | 12,500 | · | · | 164,259 Direct | +8.24% | Acquired | (price as of 2026-10-02) |
| April 28, 2006 | COST | M | 60,000 | $34.28 | $2,056,800 | 0 Direct | -100.00% | Disposed | 2585.7% (price as of 2026-10-02) |
| April 28, 2006 | COST | M | 60,000 | $43.00 | $2,580,000 | 0 Direct | -100.00% | Disposed | 2041.0% (price as of 2026-10-02) |
| April 28, 2006 | COST | M | 80,000 | $36.91 | $2,952,800 | 0 Direct | -100.00% | Disposed | 2394.3% (price as of 2026-10-02) |
| April 28, 2006 | COST | M | 80,000 | $22.88 | $1,830,400 | 0 Direct | -100.00% | Disposed | 3923.8% (price as of 2026-10-02) |
| April 28, 2006 | COST | S | 280,000 | $54.35 | $15,218,000 | 151,759 Direct | -64.85% | Disposed | 1593.9% (price as of 2026-10-02) |
| April 28, 2006 | COST | M | 60,000 | $34.28 | $2,056,800 | 431,759 Direct | +16.14% | Acquired | 2585.7% (price as of 2026-10-02) |
| April 28, 2006 | COST | M | 60,000 | $43.00 | $2,580,000 | 371,759 Direct | +19.25% | Acquired | 2041.0% (price as of 2026-10-02) |
| April 28, 2006 | COST | M | 80,000 | $36.91 | $2,952,800 | 311,759 Direct | +34.52% | Acquired | 2394.3% (price as of 2026-10-02) |
| April 28, 2006 | COST | M | 80,000 | $22.87 | $1,829,600 | 231,759 Direct | +52.72% | Acquired | 3925.6% (price as of 2026-10-02) |
| Oct. 10, 2005 | COST | M | 20,000 | $8.75 | $175,000 | 172,159 Direct | +13.14% | Acquired | 10421.7% (price as of 2026-10-02) |
| Oct. 10, 2005 | COST | M | 50,000 | $13.44 | $672,000 | 222,159 Direct | +29.04% | Acquired | 6750.1% (price as of 2026-10-02) |
| Oct. 10, 2005 | COST | S | 70,000 | $45.33 | $3,173,100 | 152,159 Direct | -31.51% | Disposed | 1931.0% (price as of 2026-10-02) |
| Oct. 10, 2005 | COST | M | 20,000 | · | · | 0 Direct | -100.00% | Disposed | (price as of 2026-10-02) |
| Oct. 10, 2005 | COST | M | 50,000 | · | · | 0 Direct | -100.00% | Disposed | (price as of 2026-10-02) |
| April 26, 2005 | COST | M | 20,000 | $8.25 | $165,000 | 122,902 Direct | +19.44% | Acquired | 11059.4% (price as of 2026-10-02) |
| April 26, 2005 | COST | M | 30,000 | $8.75 | $262,500 | 152,902 Direct | +24.41% | Acquired | 10421.7% (price as of 2026-10-02) |
| April 26, 2005 | COST | M | 20,000 | · | · | 0 Direct | -100.00% | Disposed | (price as of 2026-10-02) |
| April 26, 2005 | COST | M | 30,000 | · | · | 20,000 Direct | -60.00% | Disposed | (price as of 2026-10-02) |
| April 1, 2005 | COST | A | 75,000 | · | · | 75,000 Direct | · | Acquired | (price as of 2026-10-02) |
| Oct. 14, 2004 | COST | S | 50,000 | $45.36 | $2,268,000 | 102,902 Direct | -32.70% | Disposed | 1929.7% (price as of 2026-10-02) |
| April 1, 2004 | COST | A | 75,000 | · | · | 75,000 Direct | · | Acquired | (price as of 2026-10-02) |
| April 1, 2004 | COST | A | 75,000 | · | · | 75,000 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 |
|---|---|---|---|---|---|---|---|
| Oct. 14, 2011 | COST | Stock Option | Common Stock | $43.79 | April 1, 2015 | 44,000 | Disposed |
| Oct. 8, 2010 | COST | Stock Option | Common Stock | $33.75 | April 1, 2013 | 12,000 | Disposed |
| Oct. 8, 2010 | COST | Stock Option | Common Stock | $43.79 | April 1, 2015 | 31,000 | Disposed |
| Oct. 13, 2009 | COST | Stock Option | Common Stock | $37.35 | April 1, 2014 | 75,000 | Disposed |
| March 27, 2008 | COST | Stock Option | Common Stock | $33.75 | April 1, 2013 | 12,000 | Disposed |
| March 27, 2008 | COST | Stock Option | Common Stock | $39.25 | April 2, 2012 | 36,000 | Disposed |
| March 27, 2008 | COST | Stock Option | Common Stock | $30.41 | April 1, 2013 | 12,000 | Disposed |
| Feb. 12, 2007 | COST | Stock Option | Common Stock | $33.75 | April 1, 2013 | 24,000 | Disposed |
| Feb. 12, 2007 | COST | Stock Option | Common Stock | $38.79 | April 1, 2012 | 24,000 | Disposed |
| Jan. 12, 2007 | COST | Stock Option | Common Stock | $33.75 | April 1, 2013 | 24,000 | Disposed |
| Jan. 12, 2007 | COST | Stock Option | Common Stock | $38.79 | April 2, 2012 | 24,000 | Disposed |
| April 28, 2006 | COST | Stock Option | Common Stock | $34.28 | April 24, 2011 | 60,000 | Disposed |
| April 28, 2006 | COST | Stock Option | Common Stock | $43.00 | March 13, 2010 | 60,000 | Disposed |
| April 28, 2006 | COST | Stock Option | Common Stock | $36.91 | Feb. 9, 2009 | 80,000 | Disposed |
| April 28, 2006 | COST | Stock Option | Common Stock | $22.88 | Feb. 17, 2008 | 80,000 | Disposed |
| Oct. 10, 2005 | COST | Stock Option | Common Stock | $8.75 | April 10, 2006 | 20,000 | Disposed |
| Oct. 10, 2005 | COST | Stock Option | Common Stock | $13.44 | April 2, 2007 | 50,000 | Disposed |
| April 26, 2005 | COST | Stock Option | Common Stock | $8.25 | Oct. 26, 2005 | 20,000 | Disposed |
| April 26, 2005 | COST | Stock Option | Common Stock | $8.75 | April 10, 2006 | 30,000 | Disposed |
| April 1, 2005 | COST | Stock Option | Common Stock | $43.79 | April 1, 2015 | 75,000 | Acquired |
| April 1, 2004 | COST | Stock Option | Common Stock | $37.35 | March 31, 2014 | 75,000 | Acquired |
| April 1, 2004 | COST | Stock Option | Common Stock | $37.35 | March 31, 2014 | 75,000 | Acquired |
Exercise/conversion price is blank when not applicable (e.g. RSUs).
Initial ownership (Form 3) 11 holdings
Securities held when first becoming an insider, per SEC Form 3.
| Date | Ticker | Security | Shares | Ownership |
|---|---|---|---|---|
| Oct. 19, 2004 | COST | Common Stock | 152,902 | Direct |
| Feb. 6, 2004 | COST | Common Stock | 155,142 | Direct |
| Feb. 6, 2004 | COST | Stock Option [F1] | 20,000 | Direct |
| Feb. 6, 2004 | COST | Stock Option [F1] | 50,000 | Direct |
| Feb. 6, 2004 | COST | Stock Option [F1] | 50,000 | Direct |
| Feb. 6, 2004 | COST | Stock Option [F1] | 80,000 | Direct |
| Feb. 6, 2004 | COST | Stock Option [F2] | 60,000 | Direct |
| Feb. 6, 2004 | COST | Stock Option [F1] | 60,000 | Direct |
| Feb. 6, 2004 | COST | Stock Option [F1] | 80,000 | Direct |
| Feb. 6, 2004 | COST | Stock Option [F2] | 60,000 | Direct |
| Feb. 6, 2004 | COST | Stock Option [F1] | 60,000 | Direct |
Compensation (DEF 14A)
Matched by name from proxy statements (DEF 14A) — verify against the filing.
| Fiscal year | Salary | Bonus | Stock awards | Option awards | Non-equity incentive | Pension change | Other | Total |
|---|---|---|---|---|---|---|---|---|
| 2008 | $458,462 | $42,063 | · | · | · | · | $64,061 | $2,642,501 |
Figures from the Summary Compensation Table of the company's proxy statement (DEF 14A). Compensation is not a recommendation.