| Feb. 27, 2015 |
WST
|
M |
10,000 |
$20.85 |
$208,500 |
13,832
Direct
|
-41.96%
|
Disposed |
1597.7%
(price as of 2026-08-20)
|
| Feb. 27, 2015 |
WST
|
S |
10,000 |
$54.85 |
$548,500 |
90,724
Direct
|
-9.93%
|
Disposed |
545.4%
(price as of 2026-08-20)
|
| Feb. 27, 2015 |
WST
|
M |
10,000 |
$20.85 |
$208,500 |
100,724
Direct
|
+11.02%
|
Acquired |
1597.7%
(price as of 2026-08-20)
|
| Dec. 31, 2014 |
WST
|
A |
7,222 |
$51.53 |
$372,150 |
90,724
Direct
|
+8.65%
|
Acquired |
586.9%
(price as of 2026-08-20)
|
| Nov. 26, 2014 |
WST
|
S |
8,000 |
$52.11 |
$416,880 |
83,335
Direct
|
-8.76%
|
Disposed |
579.3%
(price as of 2026-08-20)
|
| Aug. 21, 2014 |
WST
|
S |
10,000 |
$44.07 |
$440,700 |
90,795
Direct
|
-9.92%
|
Disposed |
703.2%
(price as of 2026-08-20)
|
| May 30, 2014 |
WST
|
M |
22,828 |
$22.48 |
$513,173 |
0
Direct
|
-100.00%
|
Disposed |
1474.6%
(price as of 2026-08-20)
|
| May 30, 2014 |
WST
|
S |
22,828 |
$42.17 |
$962,657 |
100,795
Direct
|
-18.47%
|
Disposed |
739.4%
(price as of 2026-08-20)
|
| May 30, 2014 |
WST
|
M |
22,828 |
$22.48 |
$513,173 |
123,623
Direct
|
+22.65%
|
Acquired |
1474.6%
(price as of 2026-08-20)
|
| Feb. 24, 2014 |
WST
|
A |
12,536 |
$47.34 |
$593,454 |
12,536
Direct
|
—
|
Acquired |
647.7%
(price as of 2026-08-20)
|
| Feb. 18, 2014 |
WST
|
A |
5,376 |
$48.69 |
$261,757 |
100,613
Direct
|
+5.64%
|
Acquired |
627.0%
(price as of 2026-08-20)
|
| Jan. 17, 2014 |
WST
|
F |
3,913 |
$49.69 |
$194,437 |
95,048
Direct
|
-3.95%
|
Disposed |
612.4%
(price as of 2026-08-20)
|
| Nov. 4, 2013 |
WST
|
M |
22,000 |
$12.76 |
$280,720 |
107,501
Direct
|
+25.73%
|
Acquired |
2674.1%
(price as of 2026-08-20)
|
| Nov. 4, 2013 |
WST
|
M |
16,708 |
$16.29 |
$272,173 |
124,209
Direct
|
+15.54%
|
Acquired |
2073.0%
(price as of 2026-08-20)
|
| Nov. 4, 2013 |
WST
|
S |
16,708 |
$46.99 |
$785,109 |
107,501
Direct
|
-13.45%
|
Disposed |
653.3%
(price as of 2026-08-20)
|
| Nov. 4, 2013 |
WST
|
S |
22,000 |
$46.99 |
$1,033,780 |
85,501
Direct
|
-20.46%
|
Disposed |
653.3%
(price as of 2026-08-20)
|
| Nov. 4, 2013 |
WST
|
M |
16,708 |
$16.29 |
$272,173 |
0
Direct
|
-100.00%
|
Disposed |
2073.0%
(price as of 2026-08-20)
|
| Nov. 4, 2013 |
WST
|
M |
22,000 |
$12.76 |
$280,720 |
0
Direct
|
-100.00%
|
Disposed |
2674.1%
(price as of 2026-08-20)
|
| Feb. 22, 2013 |
WST
|
F |
180 |
$60.70 |
$10,926 |
42,399
Direct
|
-0.42%
|
Disposed |
1066.3%
(price as of 2026-08-20)
|
| Feb. 19, 2013 |
WST
|
A |
11,414 |
— |
— |
11,414
Direct
|
—
|
Acquired |
(price as of 2026-08-20)
|
| Feb. 19, 2013 |
WST
|
A |
2,789 |
$59.11 |
$164,858 |
42,579
Direct
|
+7.01%
|
Acquired |
1097.7%
(price as of 2026-08-20)
|
| Jan. 14, 2013 |
WST
|
F |
614 |
$55.05 |
$33,801 |
39,641
Direct
|
-1.53%
|
Disposed |
1186.0%
(price as of 2026-08-20)
|
| Nov. 30, 2012 |
WST
|
M |
14,600 |
$19.36 |
$282,656 |
0
Direct
|
-100.00%
|
Disposed |
3556.8%
(price as of 2026-08-20)
|
| Nov. 30, 2012 |
WST
|
F |
8,736 |
$54.03 |
$472,006 |
38,146
Direct
|
-18.63%
|
Disposed |
1210.3%
(price as of 2026-08-20)
|
| Nov. 30, 2012 |
WST
|
M |
14,600 |
$19.36 |
$282,656 |
46,882
Direct
|
+45.23%
|
Acquired |
3556.8%
(price as of 2026-08-20)
|
| May 30, 2012 |
WST
|
M |
16,000 |
$14.22 |
$227,520 |
0
Direct
|
-100.00%
|
Disposed |
4878.6%
(price as of 2026-08-20)
|
| May 30, 2012 |
WST
|
S |
16,000 |
$47.78 |
$764,480 |
30,542
Direct
|
-34.38%
|
Disposed |
1381.7%
(price as of 2026-08-20)
|
| May 30, 2012 |
WST
|
M |
16,000 |
$14.22 |
$227,520 |
46,542
Direct
|
+52.39%
|
Acquired |
4878.6%
(price as of 2026-08-20)
|
| Feb. 21, 2012 |
WST
|
A |
940 |
$42.44 |
$39,894 |
30,371
Direct
|
+3.19%
|
Acquired |
1568.1%
(price as of 2026-08-20)
|
| Feb. 21, 2012 |
WST
|
A |
16,393 |
— |
— |
16,393
Direct
|
—
|
Acquired |
(price as of 2026-08-20)
|
| Feb. 21, 2012 |
WST
|
A |
1,371 |
$42.44 |
$58,185 |
30,802
Direct
|
+4.66%
|
Acquired |
1568.1%
(price as of 2026-08-20)
|
| Jan. 16, 2012 |
WST
|
F |
583 |
$38.95 |
$22,708 |
30,851
Direct
|
-1.85%
|
Disposed |
1717.6%
(price as of 2026-08-20)
|
| Feb. 22, 2011 |
WST
|
A |
14,840 |
— |
— |
14,840
Direct
|
—
|
Acquired |
(price as of 2026-08-20)
|
| Feb. 22, 2011 |
WST
|
A |
1,268 |
$40.85 |
$51,798 |
28,777
Direct
|
+4.61%
|
Acquired |
1633.0%
(price as of 2026-08-20)
|
| Feb. 4, 2011 |
WST
|
F |
510 |
— |
— |
27,509
Direct
|
-1.82%
|
Disposed |
(price as of 2026-08-20)
|
| March 22, 2010 |
WST
|
A |
16,393 |
— |
— |
16,393
Direct
|
—
|
Acquired |
(price as of 2026-08-20)
|
| Feb. 19, 2010 |
WST
|
A |
1,101 |
$38.22 |
$42,080 |
25,655
Direct
|
+4.48%
|
Acquired |
1752.3%
(price as of 2026-08-20)
|
| Jan. 22, 2010 |
WST
|
F |
1,033 |
$38.17 |
$39,430 |
24,554
Direct
|
-4.04%
|
Disposed |
1754.7%
(price as of 2026-08-20)
|
| Feb. 24, 2009 |
WST
|
A |
2,561 |
$32.09 |
$82,182 |
19,976
Indirect
|
+14.71%
|
Acquired |
2106.1%
(price as of 2026-08-20)
|
| Feb. 24, 2009 |
WST
|
A |
2,854 |
$32.09 |
$91,585 |
21,211
Direct
|
+15.55%
|
Acquired |
2106.1%
(price as of 2026-08-20)
|
| Feb. 24, 2009 |
WST
|
A |
2,568 |
$32.09 |
$82,407 |
19,983
Indirect
|
+14.75%
|
Acquired |
2106.1%
(price as of 2026-08-20)
|
| Feb. 24, 2009 |
WST
|
A |
11,000 |
— |
— |
11,000
Direct
|
—
|
Acquired |
(price as of 2026-08-20)
|
| Dec. 29, 2008 |
WST
|
A |
11 |
$35.90 |
$395 |
17,415
Indirect
|
+0.06%
|
Acquired |
1872.0%
(price as of 2026-08-20)
|
| Dec. 18, 2008 |
WST
|
D |
248 |
$37.14 |
$9,211 |
17,882
Indirect
|
-1.37%
|
Disposed |
1806.2%
(price as of 2026-08-20)
|
| Dec. 12, 2008 |
WST
|
A |
11 |
$36.00 |
$396 |
17,646
Indirect
|
+0.06%
|
Acquired |
1866.5%
(price as of 2026-08-20)
|
| Nov. 28, 2008 |
WST
|
A |
12 |
$35.50 |
$426 |
17,633
Indirect
|
+0.07%
|
Acquired |
1894.2%
(price as of 2026-08-20)
|
| Nov. 14, 2008 |
WST
|
A |
12 |
$35.16 |
$422 |
17,627
Indirect
|
+0.07%
|
Acquired |
1913.5%
(price as of 2026-08-20)
|
| Oct. 31, 2008 |
WST
|
A |
10 |
$39.92 |
$399 |
17,600
Indirect
|
+0.06%
|
Acquired |
1673.4%
(price as of 2026-08-20)
|
| Oct. 17, 2008 |
WST
|
A |
10 |
$40.39 |
$404 |
17,520
Indirect
|
+0.06%
|
Acquired |
1652.8%
(price as of 2026-08-20)
|
| Oct. 6, 2008 |
WST
|
A |
9 |
$44.09 |
$397 |
17,503
Indirect
|
+0.05%
|
Acquired |
1505.7%
(price as of 2026-08-20)
|
| Sept. 19, 2008 |
WST
|
A |
8 |
$51.66 |
$413 |
17,480
Indirect
|
+0.05%
|
Acquired |
1270.4%
(price as of 2026-08-20)
|
| Sept. 5, 2008 |
WST
|
A |
8 |
$48.52 |
$388 |
17,475
Indirect
|
+0.05%
|
Acquired |
1359.1%
(price as of 2026-08-20)
|
| Aug. 22, 2008 |
WST
|
A |
8 |
$49.10 |
$393 |
17,466
Indirect
|
+0.05%
|
Acquired |
1341.9%
(price as of 2026-08-20)
|
| Aug. 11, 2008 |
WST
|
S |
4,200 |
$49.21 |
$206,682 |
18,146
Direct
|
-18.80%
|
Disposed |
1338.6%
(price as of 2026-08-20)
|
| Aug. 8, 2008 |
WST
|
A |
8 |
$49.50 |
$396 |
17,458
Indirect
|
+0.05%
|
Acquired |
1330.2%
(price as of 2026-08-20)
|
| July 25, 2008 |
WST
|
A |
9 |
$45.72 |
$411 |
17,459
Indirect
|
+0.05%
|
Acquired |
1448.4%
(price as of 2026-08-20)
|
| July 21, 2008 |
WST
|
D |
206 |
$43.65 |
$8,992 |
17,454
Indirect
|
-1.17%
|
Disposed |
1521.9%
(price as of 2026-08-20)
|
| July 11, 2008 |
WST
|
A |
9 |
$43.59 |
$392 |
17,606
Indirect
|
+0.05%
|
Acquired |
1524.1%
(price as of 2026-08-20)
|
| June 27, 2008 |
WST
|
A |
9 |
$43.86 |
$395 |
17,595
Indirect
|
+0.05%
|
Acquired |
1514.1%
(price as of 2026-08-20)
|
| June 13, 2008 |
WST
|
A |
9 |
$47.95 |
$432 |
17,576
Indirect
|
+0.05%
|
Acquired |
1376.4%
(price as of 2026-08-20)
|
| May 30, 2008 |
WST
|
A |
9 |
$47.43 |
$427 |
17,569
Indirect
|
+0.05%
|
Acquired |
1392.6%
(price as of 2026-08-20)
|
| May 16, 2008 |
WST
|
A |
9 |
$46.34 |
$417 |
17,560
Indirect
|
+0.05%
|
Acquired |
1427.7%
(price as of 2026-08-20)
|
| May 2, 2008 |
WST
|
A |
9 |
$46.90 |
$422 |
17,550
Indirect
|
+0.05%
|
Acquired |
1409.5%
(price as of 2026-08-20)
|
| April 18, 2008 |
WST
|
A |
9 |
$46.94 |
$422 |
17,489
Indirect
|
+0.05%
|
Acquired |
1408.2%
(price as of 2026-08-20)
|
| April 4, 2008 |
WST
|
A |
9 |
$44.76 |
$403 |
17,484
Indirect
|
+0.05%
|
Acquired |
1481.7%
(price as of 2026-08-20)
|
| April 1, 2008 |
WST
|
M |
12,000 |
$11.30 |
$135,600 |
0
Direct
|
-100.00%
|
Disposed |
6165.0%
(price as of 2026-08-20)
|
| April 1, 2008 |
WST
|
F |
5,754 |
$45.15 |
$259,793 |
22,125
Direct
|
-20.64%
|
Disposed |
1468.0%
(price as of 2026-08-20)
|
| April 1, 2008 |
WST
|
M |
12,000 |
$11.30 |
$135,600 |
27,879
Direct
|
+75.57%
|
Acquired |
6165.0%
(price as of 2026-08-20)
|
| March 20, 2008 |
WST
|
A |
9 |
$43.70 |
$393 |
17,479
Indirect
|
+0.05%
|
Acquired |
1520.0%
(price as of 2026-08-20)
|
| March 7, 2008 |
WST
|
A |
10 |
$39.70 |
$397 |
17,472
Indirect
|
+0.06%
|
Acquired |
1683.2%
(price as of 2026-08-20)
|
| Feb. 26, 2008 |
WST
|
A |
11,916 |
— |
— |
11,916
Direct
|
—
|
Acquired |
(price as of 2026-08-20)
|
| Feb. 26, 2008 |
WST
|
A |
1,689 |
$41.70 |
$70,431 |
17,461
Indirect
|
+10.71%
|
Acquired |
1597.7%
(price as of 2026-08-20)
|
| Feb. 26, 2008 |
WST
|
A |
4,494 |
$41.70 |
$187,400 |
15,772
Indirect
|
+39.85%
|
Acquired |
1597.7%
(price as of 2026-08-20)
|
| Feb. 22, 2008 |
WST
|
A |
10 |
$40.66 |
$407 |
11,278
Indirect
|
+0.09%
|
Acquired |
1641.1%
(price as of 2026-08-20)
|
| Feb. 8, 2008 |
WST
|
A |
11 |
$37.97 |
$418 |
11,273
Indirect
|
+0.10%
|
Acquired |
1764.5%
(price as of 2026-08-20)
|
| Jan. 25, 2008 |
WST
|
A |
11 |
$37.93 |
$417 |
11,261
Indirect
|
+0.10%
|
Acquired |
1766.5%
(price as of 2026-08-20)
|
| Jan. 11, 2008 |
WST
|
A |
10 |
$41.10 |
$411 |
11,207
Indirect
|
+0.09%
|
Acquired |
1622.5%
(price as of 2026-08-20)
|
| Dec. 28, 2007 |
WST
|
A |
10 |
$40.35 |
$404 |
11,197
Indirect
|
+0.09%
|
Acquired |
1654.5%
(price as of 2026-08-20)
|
| Dec. 14, 2007 |
WST
|
A |
11 |
$37.88 |
$417 |
11,191
Indirect
|
+0.10%
|
Acquired |
1768.9%
(price as of 2026-08-20)
|
| Nov. 30, 2007 |
WST
|
A |
11 |
$37.57 |
$413 |
11,181
Indirect
|
+0.10%
|
Acquired |
1784.3%
(price as of 2026-08-20)
|
| Nov. 16, 2007 |
WST
|
A |
10 |
$39.29 |
$393 |
11,166
Indirect
|
+0.09%
|
Acquired |
1701.9%
(price as of 2026-08-20)
|
| Nov. 2, 2007 |
WST
|
A |
10 |
$38.75 |
$388 |
11,158
Indirect
|
+0.09%
|
Acquired |
1727.0%
(price as of 2026-08-20)
|
| Oct. 19, 2007 |
WST
|
A |
10 |
$40.01 |
$400 |
11,105
Indirect
|
+0.09%
|
Acquired |
1669.4%
(price as of 2026-08-20)
|
| Oct. 5, 2007 |
WST
|
A |
10 |
$40.21 |
$402 |
11,094
Indirect
|
+0.09%
|
Acquired |
1660.6%
(price as of 2026-08-20)
|
| Sept. 21, 2007 |
WST
|
A |
10 |
$41.08 |
$411 |
11,082
Indirect
|
+0.09%
|
Acquired |
1623.3%
(price as of 2026-08-20)
|
| Sept. 7, 2007 |
WST
|
A |
10 |
$40.10 |
$401 |
11,074
Indirect
|
+0.09%
|
Acquired |
1665.5%
(price as of 2026-08-20)
|
| Aug. 24, 2007 |
WST
|
A |
10 |
$40.72 |
$407 |
11,062
Indirect
|
+0.09%
|
Acquired |
1638.6%
(price as of 2026-08-20)
|
| Aug. 10, 2007 |
WST
|
A |
10 |
$41.92 |
$419 |
11,051
Indirect
|
+0.09%
|
Acquired |
1588.8%
(price as of 2026-08-20)
|
| July 27, 2007 |
WST
|
A |
8 |
$47.23 |
$378 |
11,034
Indirect
|
+0.07%
|
Acquired |
1398.9%
(price as of 2026-08-20)
|
| July 13, 2007 |
WST
|
A |
8 |
$51.83 |
$415 |
10,991
Indirect
|
+0.07%
|
Acquired |
1265.9%
(price as of 2026-08-20)
|
| June 29, 2007 |
WST
|
A |
8 |
$47.15 |
$377 |
10,989
Indirect
|
+0.07%
|
Acquired |
1401.5%
(price as of 2026-08-20)
|
| June 15, 2007 |
WST
|
A |
9 |
$48.33 |
$435 |
10,976
Indirect
|
+0.08%
|
Acquired |
1364.8%
(price as of 2026-08-20)
|
| June 1, 2007 |
WST
|
A |
8 |
$51.35 |
$411 |
10,963
Indirect
|
+0.07%
|
Acquired |
1278.7%
(price as of 2026-08-20)
|
| May 18, 2007 |
WST
|
A |
8 |
$48.65 |
$389 |
10,958
Indirect
|
+0.07%
|
Acquired |
1355.2%
(price as of 2026-08-20)
|
| May 4, 2007 |
WST
|
A |
8 |
$51.78 |
$414 |
10,948
Indirect
|
+0.07%
|
Acquired |
1267.2%
(price as of 2026-08-20)
|
| April 20, 2007 |
WST
|
A |
8 |
$47.12 |
$377 |
10,945
Indirect
|
+0.07%
|
Acquired |
1402.4%
(price as of 2026-08-20)
|
| April 9, 2007 |
WST
|
A |
8 |
$46.78 |
$374 |
10,909
Indirect
|
+0.07%
|
Acquired |
1413.4%
(price as of 2026-08-20)
|
| March 23, 2007 |
WST
|
A |
8 |
$45.75 |
$366 |
10,901
Indirect
|
+0.07%
|
Acquired |
1447.4%
(price as of 2026-08-20)
|
| March 9, 2007 |
WST
|
A |
8 |
$42.29 |
$338 |
10,896
Indirect
|
+0.07%
|
Acquired |
1574.0%
(price as of 2026-08-20)
|
| Feb. 28, 2007 |
WST
|
F |
28 |
$45.35 |
$1,270 |
15,485
Direct
|
-0.18%
|
Disposed |
1461.1%
(price as of 2026-08-20)
|