Insider Trading activities of Zendesk, Inc. insiders.

Monthly summaries of insider trading activities (stock purchases, sales, and option exercises) reported by insiders of Zendesk, Inc. since 2005 are illustrated in Table 1 and Table 2. Table 1 shows the monthly insider trading data of Zendesk, Inc. since year 2005. Table 2 shows the detailed insider transactions of Zendesk, Inc. since 2005. The reporting company's ticker symbol is ZEN. The reporting company's CIK number is 1463172.
The total value of stock buying since 2005 is $12,764,495.
The total value of stock sales since 2005 is $164,531,247.
The total value of stock option exercises since 2005 is $13,929,457.


Table 1. Monthly summaries of insider stock purchases, sales, and option exercises for Zendesk, Inc. (ZEN).
Trading Period Insider Buying Insider Sales Option Exercises
year-month Shares Value Shares Value Shares Value
2018-11 0 $0 83,679 $4,571,649 23,627 $66,640
2018-10 0 $0 8,073 $502,264 22,623 $33,108
2018-09 0 $0 20,764 $1,452,447 26,622 $179,280
2018-08 0 $0 87,058 $5,422,606 29,294 $136,914
2018-07 0 $0 2,073 $125,063 16,620 $0
2018-06 0 $0 11,639 $673,987 26,125 $56,553
2018-05 0 $0 110,732 $6,128,746 78,176 $58,600
2018-04 0 $0 9,425 $466,472 22,521 $98,000
2018-03 0 $0 6,925 $338,627 20,025 $117,200
2018-02 0 $0 211,925 $8,586,871 155,017 $890,000
2018-01 0 $0 16,593 $606,949 26,857 $126,399
2017-12 0 $0 7,553 $257,784 16,862 $31,200
2017-11 0 $0 140,283 $4,858,271 96,855 $1,300,070
2017-10 0 $0 2,967 $89,309 11,861 $0
2017-09 0 $0 12,966 $378,938 26,262 $62,400
2017-08 0 $0 69,890 $1,976,410 19,643 $31,015
2017-07 0 $0 8,459 $247,477 24,645 $62,206
2017-06 0 $0 38,736 $1,085,432 61,236 $382,844
2017-05 0 $0 101,666 $2,730,250 179,715 $114,016
2017-04 0 $0 1,766 $49,801 4,634 $0
2017-03 0 $0 23,459 $642,737 19,341 $31,015
2017-02 0 $0 58,439 $1,468,620 13,020 $62,206
2017-01 0 $0 3,283 $77,547 8,372 $31,015
2016-12 0 $0 3,046 $65,501 8,372 $31,006
2016-11 0 $0 68,835 $1,644,750 14,984 $46,219
2016-10 0 $0 11,693 $342,600 18,373 $73,714
2016-09 0 $0 141,693 $4,315,494 118,371 $731,705
2016-08 0 $0 198,726 $6,048,313 61,740 $436,664
2016-07 0 $0 147,212 $4,221,317 150,954 $1,146,812
2016-06 0 $0 156,088 $4,146,077 154,847 $1,177,508
2016-05 0 $0 94,354 $2,340,934 96,098 $539,498
2016-04 0 $0 10,209 $222,996 14,152 $32,681
2016-03 0 $0 38,636 $773,063 38,654 $157,648
2016-02 0 $0 5,000 $82,135 5,468 $11,500
2016-01 0 $0 9,184 $213,964 14,023 $65,309
2015-12 0 $0 228,500 $5,862,364 191,716 $1,063,284
2015-11 0 $0 435,978 $10,857,175 340,991 $2,127,827
2015-10 0 $0 31,650 $644,900 34,573 $35,039
2015-09 0 $0 31,648 $681,959 34,570 $33,997
2015-08 0 $0 46,153 $953,851 38,155 $43,278
2015-07 0 $0 22,024 $467,352 26,573 $64,495
2015-06 0 $0 225,107 $5,034,149 55,745 $58,996
2015-05 0 $0 400,145 $9,006,483 92,657 $71,286
2015-04 0 $0 63,384 $1,448,334 67,931 $71,489
2015-03 0 $0 1,509,431 $32,939,726 98,976 $224,488
2015-02 0 $0 132,381 $3,230,717 72,381 $144,106
2015-01 0 $0 153,786 $3,797,193 77,380 $145,557
2014-12 0 $0 575,680 $13,711,811 421,104 $819,295
2014-11 0 $0 360,495 $8,739,832 307,541 $705,375
2014-05 1,370,000 $12,764,495 0 $0 0 $0

Table 2. Detailed insider stock purchases, sales, and option exercises of Zendesk, Inc. insiders (ZEN)
  Trade Date   Insider Name Trade Type     Shares       Price ($)   Value ($)
2018-11-30 Keiser John T. (Chief Operating Officer) Sale 4,467 60.00 268,020
2018-11-19 Mcdermott Adrian (President of Products) Sale 1,810 54.54 98,717
2018-11-19 Titterton Jeffrey J (Chief Marketing Officer) Sale 402 54.54 21,925
2018-11-15 Gomez Elena (Chief Financial Officer) Option Ex 3,869 .00 0
2018-11-15 Svane Mikkel (Chairman and CEO) Sale 50,000 53.12 2,655,850
2018-11-15 Svane Mikkel (Chairman and CEO) Option Ex 2,657 .00 0
2018-11-15 Mcdermott Adrian (President of Products) Option Ex 3,597 .00 0
2018-11-15 Geschke John (CLO and SVP Administration) Option Ex 1,091 .00 0
2018-11-15 Keiser John T. (Chief Operating Officer) Option Ex 3,812 .00 0
2018-11-15 Titterton Jeffrey J (Chief Marketing Officer) Option Ex 1,601 .00 0
2018-11-13 Geschke John (CLO and SVP Administration) Sale 7,000 53.31 373,177
2018-11-13 Geschke John (CLO and SVP Administration) Option Ex 7,000 9.52 66,640
2018-11-07 Wilson L Michelle Sale 20,000 57.70 1,153,960
2018-10-17 Mcdermott Adrian (President of Products) Sale 1,809 63.70 115,233
2018-10-17 Titterton Jeffrey J (Chief Marketing Officer) Sale 264 63.70 16,816
2018-10-15 Gomez Elena (Chief Financial Officer) Option Ex 3,869 .00 0
2018-10-15 Svane Mikkel (Chairman and CEO) Option Ex 2,656 .00 0
2018-10-15 Mcdermott Adrian (President of Products) Option Ex 3,596 .00 0
2018-10-15 Geschke John (CLO and SVP Administration) Sale 5,000 60.74 303,705
2018-10-15 Geschke John (CLO and SVP Administration) Option Ex 6,092 1.59 9,668
2018-10-15 Keiser John T. (Chief Operating Officer) Option Ex 3,810 .00 0
2018-10-15 Titterton Jeffrey J (Chief Marketing Officer) Option Ex 1,600 .00 0
2018-10-05 Gomez Elena (Chief Financial Officer) Sale 1,000 66.51 66,510
2018-10-05 Gomez Elena (Chief Financial Officer) Option Ex 1,000 23.44 23,440
2018-09-20 Gomez Elena (Chief Financial Officer) Sale 500 67.20 33,600
2018-09-19 Titterton Jeffrey J (SVP, Marketing) Sale 264 68.46 18,073
2018-09-17 Geschke John (CLO and SVP Administration) Sale 5,000 69.71 348,564
2018-09-17 Geschke John (CLO and SVP Administration) Option Ex 5,000 9.52 47,600
2018-09-15 Gomez Elena (Chief Financial Officer) Option Ex 3,868 .00 0
2018-09-15 Svane Mikkel (Chairman and CEO) Option Ex 2,656 .00 0
2018-09-15 Mcdermott Adrian (President of Products) Option Ex 3,597 .00 0
2018-09-15 Geschke John (CLO and SVP Administration) Option Ex 1,092 .00 0
2018-09-15 Keiser John T. (Chief Operating Officer) Option Ex 3,810 .00 0
2018-09-15 Titterton Jeffrey J (SVP, Marketing) Option Ex 1,599 .00 0
2018-09-12 Nelson Elizabeth A Sale 10,000 70.42 704,210
2018-09-10 Gomez Elena (Chief Financial Officer) Sale 4,000 70.00 280,000
2018-09-10 Gomez Elena (Chief Financial Officer) Option Ex 4,000 27.06 108,240
2018-09-06 Gomez Elena (Chief Financial Officer) Sale 1,000 68.00 68,000
2018-09-06 Gomez Elena (Chief Financial Officer) Option Ex 1,000 23.44 23,440
2018-08-23 Gomez Elena (Chief Financial Officer) Sale 7,000 65.00 455,000
2018-08-23 Gomez Elena (Chief Financial Officer) Option Ex 5,000 23.44 117,200
2018-08-17 Mcdermott Adrian (President of Products) Sale 1,811 62.10 112,463
2018-08-17 Keiser John T. (Chief Operating Officer) Sale 1,489 62.10 92,466
2018-08-17 Titterton Jeffrey J (SVP, Marketing) Sale 264 62.10 16,394
2018-08-15 Gomez Elena (Chief Financial Officer) Option Ex 3,869 .00 0
2018-08-15 Svane Mikkel (Chairman and CEO) Sale 50,000 62.46 3,123,050
2018-08-15 Svane Mikkel (Chairman and CEO) Option Ex 2,657 .00 0
2018-08-15 Mcdermott Adrian (President of Products) Option Ex 3,598 .00 0
2018-08-15 Geschke John (CLO and SVP Administration) Sale 7,666 62.44 478,680
2018-08-15 Geschke John (CLO and SVP Administration) Option Ex 8,758 2.25 19,714
2018-08-15 Keiser John T. (Chief Operating Officer) Option Ex 3,811 .00 0
2018-08-15 Titterton Jeffrey J (SVP, Marketing) Option Ex 1,601 .00 0
2018-08-06 Gomez Elena (Chief Financial Officer) Sale 1,092 60.79 66,382
2018-08-06 Koplow Hilarie A. Sale 2,723 60.79 165,531
2018-08-06 Keiser John T. (Chief Operating Officer) Sale 15,013 60.79 912,640
2018-07-18 Mcdermott Adrian (President of Products) Sale 1,809 60.33 109,136
2018-07-18 Titterton Jeffrey J (SVP, Marketing) Sale 264 60.33 15,927
2018-07-15 Gomez Elena (Chief Financial Officer) Option Ex 3,868 .00 0
2018-07-15 Svane Mikkel (Chairman and CEO) Option Ex 2,656 .00 0
2018-07-15 Mcdermott Adrian (President of Products) Option Ex 3,596 .00 0
2018-07-15 Geschke John (CLO and SVP Administration) Option Ex 1,091 .00 0
2018-07-15 Keiser John T. (Chief Operating Officer) Option Ex 3,809 .00 0
2018-07-15 Titterton Jeffrey J (SVP, Marketing) Option Ex 1,600 .00 0
2018-06-19 Mcdermott Adrian (President of Products) Sale 1,810 58.13 105,215
2018-06-19 Titterton Jeffrey J (SVP, Marketing) Sale 329 58.13 19,124
2018-06-15 Gomez Elena (Chief Financial Officer) Option Ex 3,870 .00 0
2018-06-15 Svane Mikkel (Chairman and CEO) Option Ex 2,656 .00 0
2018-06-15 Mcdermott Adrian (President of Products) Option Ex 3,598 .00 0
2018-06-15 Geschke John (CLO and SVP Administration) Sale 5,000 59.02 295,115
2018-06-15 Geschke John (CLO and SVP Administration) Option Ex 6,092 2.25 13,713
2018-06-15 Keiser John T. (Chief Operating Officer) Option Ex 3,811 .00 0
2018-06-15 Titterton Jeffrey J (SVP, Marketing) Option Ex 1,598 .00 0
2018-06-01 Geschke John (CLO and SVP Administration) Sale 4,500 56.56 254,533
2018-06-01 Geschke John (CLO and SVP Administration) Option Ex 4,500 9.52 42,840
2018-05-31 Nelson Elizabeth A Sale 10,000 56.68 566,830
2018-05-30 Stalder Dana Sale 40,000 56.52 2,260,680
2018-05-17 Mcdermott Adrian (President of Products) Sale 2,695 55.07 148,413
2018-05-17 Titterton Jeffrey J (SVP, Marketing) Sale 3,541 55.07 195,002
2018-05-16 Mcdermott Adrian (President of Products) Sale 915 55.00 50,325
2018-05-16 Marooney Caryn Option Ex 7,150 .00 0
2018-05-16 Frandsen Michael Lyle Option Ex 3,058 .00 0
2018-05-16 Koplow Hilarie A. Option Ex 5,445 .00 0
2018-05-16 Stalder Dana Option Ex 7,150 .00 0
2018-05-16 Bass Carl Option Ex 7,150 .00 0
2018-05-16 Nelson Elizabeth A Option Ex 7,150 .00 0
2018-05-16 Wilson L Michelle Option Ex 7,150 .00 0
2018-05-15 Gomez Elena (Chief Financial Officer) Option Ex 3,868 .00 0
2018-05-15 Svane Mikkel (Chairman and CEO) Sale 50,000 54.30 2,714,750
2018-05-15 Svane Mikkel (Chairman and CEO) Option Ex 2,657 .00 0
2018-05-15 Mcdermott Adrian (President of Products) Option Ex 3,597 .00 0
2018-05-15 Geschke John (CLO and SVP Administration) Option Ex 1,091 .00 0
2018-05-15 Keiser John T. (Chief Operating Officer) Option Ex 3,811 .00 0
2018-05-15 Titterton Jeffrey J (SVP, Marketing) Option Ex 16,399 .00 0
2018-05-08 Mcdermott Adrian (President of Products) Sale 1,081 53.79 58,146
2018-05-07 Gomez Elena (Chief Financial Officer) Sale 2,500 53.84 134,600
2018-05-07 Gomez Elena (Chief Financial Officer) Option Ex 2,500 23.44 58,600
2018-04-20 Gomez Elena (Chief Financial Officer) Sale 500 49.67 24,835
2018-04-19 Mcdermott Adrian (President of Products) Sale 1,425 50.16 71,478
2018-04-17 Gomez Elena (Chief Financial Officer) Sale 2,500 50.00 125,000
2018-04-17 Gomez Elena (Chief Financial Officer) Option Ex 2,500 23.44 58,600
2018-04-16 Geschke John (CLO and SVP Administration) Sale 5,000 49.03 245,159
2018-04-16 Geschke John (CLO and SVP Administration) Option Ex 5,000 7.88 39,400
2018-04-15 Gomez Elena (Chief Financial Officer) Option Ex 3,868 .00 0
2018-04-15 Svane Mikkel (Chairman and CEO) Option Ex 2,655 .00 0
2018-04-15 Mcdermott Adrian (President of Products) Option Ex 3,596 .00 0
2018-04-15 Geschke John (CLO and SVP Administration) Option Ex 1,092 .00 0
2018-04-15 Keiser John T. (Chief Operating Officer) Option Ex 3,810 .00 0
2018-03-27 Gomez Elena (Chief Financial Officer) Sale 5,000 50.00 250,000
2018-03-27 Gomez Elena (Chief Financial Officer) Option Ex 5,000 23.44 117,200
2018-03-20 Gomez Elena (Chief Financial Officer) Sale 500 46.04 23,020
2018-03-20 Mcdermott Adrian (President of Products) Sale 1,425 46.04 65,607
2018-03-15 Gomez Elena (Chief Financial Officer) Option Ex 3,870 .00 0
2018-03-15 Svane Mikkel (Chairman and CEO) Option Ex 2,656 .00 0
2018-03-15 Mcdermott Adrian (President of Products) Option Ex 3,597 .00 0
2018-03-15 Geschke John (CLO and SVP Administration) Option Ex 1,092 .00 0
2018-03-15 Keiser John T. (Chief Operating Officer) Option Ex 3,810 .00 0
2018-02-28 Mcdermott Adrian (President of Products) Sale 40,000 43.54 1,741,560
2018-02-28 Mcdermott Adrian (President of Products) Option Ex 40,000 6.24 249,600
2018-02-21 Mcdermott Adrian (President of Products) Sale 1,425 43.00 61,275
2018-02-20 Gomez Elena (Chief Financial Officer) Sale 500 41.99 20,995
2018-02-15 Gomez Elena (Chief Financial Officer) Option Ex 3,867 .00 0
2018-02-15 Svane Mikkel (Chairman and CEO) Option Ex 2,655 .00 0
2018-02-15 Mcdermott Adrian (President of Products) Option Ex 3,595 .00 0
2018-02-15 Geschke John (CLO and SVP Administration) Option Ex 1,090 .00 0
2018-02-15 Keiser John T. (Chief Operating Officer) Option Ex 3,810 .00 0
2018-02-14 Mcdermott Adrian (President of Products) Sale 40,000 41.72 1,668,839
2018-02-14 Mcdermott Adrian (President of Products) Option Ex 40,000 6.24 249,600
2018-02-13 Geschke John (CLO and SVP Administration) Sale 5,000 40.91 204,555
2018-02-13 Geschke John (CLO and SVP Administration) Option Ex 5,000 9.52 47,600
2018-02-12 Nelson Elizabeth A Sale 10,000 40.02 400,220
2018-02-09 Mcdermott Adrian (President of Products) Sale 49,700 39.07 1,941,977
2018-02-09 Mcdermott Adrian (President of Products) Option Ex 49,700 6.24 310,128
2018-02-09 Geschke John (CLO and SVP Administration) Sale 5,000 38.78 193,900
2018-02-09 Geschke John (CLO and SVP Administration) Option Ex 5,000 6.24 31,200
2018-02-09 Nelson Elizabeth A Sale 10,000 39.00 390,000
2018-02-08 Svane Mikkel (Chairman and CEO) Sale 50,000 39.03 1,951,550
2018-02-08 Mcdermott Adrian (President of Products) Sale 300 40.00 12,000
2018-02-08 Mcdermott Adrian (President of Products) Option Ex 300 6.24 1,872
2018-01-19 Mcdermott Adrian (President of Products) Sale 1,593 36.27 57,778
2018-01-16 Geschke John (CLO and SVP Administration) Sale 5,000 37.80 189,025
2018-01-16 Geschke John (CLO and SVP Administration) Option Ex 5,000 9.52 47,600
2018-01-15 Gomez Elena (Chief Financial Officer) Option Ex 3,149 .00 0
2018-01-15 Svane Mikkel (Chairman and CEO) Option Ex 1,898 .00 0
2018-01-15 Mcdermott Adrian (President of Products) Option Ex 3,063 .00 0
2018-01-15 Geschke John (CLO and SVP Administration) Option Ex 631 .00 0
2018-01-15 Keiser John T. (Chief Operating Officer) Option Ex 3,116 .00 0
2018-01-12 Geschke John (CLO and SVP Administration) Sale 5,000 36.95 184,740
2018-01-12 Geschke John (CLO and SVP Administration) Option Ex 5,000 6.24 31,200
2018-01-08 Geschke John (CLO and SVP Administration) Sale 1,493 35.17 52,510
2018-01-08 Geschke John (CLO and SVP Administration) Option Ex 1,493 9.52 14,213

Insider trading activities including stock purchases, stock sales, and option exercises of ZEN listed in the above tables cannot be completely guaranteed as to their accuracy. For more insider trading information of Zendesk, Inc. (symbol ZEN, CIK number 1463172) see the Securities and Exchange Commission (SEC) website.