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MESA LABORATORIES INC /CO/

MLAB Net selling
CIK 0000724004 #2870 in the set updated 17 Sep 2026
Bought (120 mo)
$1.45M
out of their own pocket, the only kind of buying there is
Sold (120 mo)
$70.18M
$1.47M on a plan · $33.09M straight out of an exercise
Sold at will
$35.62M
102 of 189 sales
Net
−$68.72M
−$34.17M against sales at will

By person

22 insiders · 252 transactions
Insider
Role
Bought
Sold
Net
Holding
Of company
Worth
Change
Sullivan John James
Director
—
$19.35M (29) scheduled
−$19.35M
95,398
1.70%
$10.85M
+15.9%
GUILLEMIN EVAN
Director
—
$10.45M (19)
−$10.45M
200,512
3.58%
$22.80M
−41.4%
Dwyer Robert V
Director
—
$8.49M (14)
−$8.49M
36,074
0.6447%
$4.10M
−52.8%
Sakys John
CFO
—
$8.32M (34) scheduled
−$8.32M
19,785
0.3536%
$2.25M
+1,086%
Owens Gary M
President and CEO
—
$6.57M (12)
−$6.57M
64,135
1.15%
$7.29M
+3,414%
Schmieder John Bradley
Director
—
$5.13M (16)
−$5.13M
82,120
1.47%
$9.34M
−1.7%
CAMPBELL H STUART
Director
—
$2.81M (13)
−$2.81M
41,677
0.7448%
$4.74M
−33.8%
KELLY DAVID M
Director
—
$2.64M (16) scheduled
−$2.64M
2,600
0.0465%
$295.59K
−55.6%
Archbold Brian David
SVP Operations
—
$2.37M (17) scheduled
−$2.37M
6,377
0.1140%
$725.00K
+1,957%
Adriance Glenn E
CSMO
—
$2.08M (5)
−$2.08M
10,000
0.1787%
$1.14M
−52.4%
DINOIA GREGORY
SVP Commercial
—
$1.08M (9)
−$1.08M
3,634
0.0649%
$413.15K
+159.6%
Kadia Siddhartha
President and CEO
$800.09K (1)
—
+$800.09K
7,093
0.1268%
$806.40K
—
BROOKS MICHAEL T
Director
—
$773.43K (2)
−$773.43K
32,730
0.5849%
$3.72M
+27.7%
Tripeny R Tony
Director
$302.26K (3)
—
+$302.26K
9,082
0.1623%
$1.03M
—
Ladiwala Shiraz Shabanali
Director
$252.81K (1)
—
+$252.81K
12,333
0.2204%
$1.40M
—
Capone Mark Christopher
Director
$99.33K (1)
—
+$99.33K
6,213
0.1110%
$706.36K
—
Crennen Lyndsey Elizabeth
CAO
—
$51.51K (2)
−$51.51K
2,020
0.0361%
$229.65K
+27.0%
Hall Shannon
Director
—
$40.24K (1)
−$40.24K
6,973
0.1246%
$792.76K
—
MESA LABORATORIES INC /CO/ entity
Director
—
—
—
29,788
0.5323%
$3.39M
+0.1%
Alltoft Jennifer Sadie
Director
—
—
—
7,662
0.1369%
$871.09K
—
Perez David Brian
Director
—
—
—
275
0.0049%
$31.26K
—
SEG Ventures, LLC entity
Director
—
—
—
0
0.0000%
$0.00
−100.0%

Individual transactions

101
Insider
Date
Role
Action
Shares
Price
Amount
Sullivan John James
13 Aug 2026
Director
Sell
7,093
$112.80
$800.09K
Sakys John
22 Jun 2026
CFO
Sell
2,827
$89.50
$253.02K
Archbold Brian David
22 Jun 2026
SVP Operations
Sell
2,516
$89.50
$225.19K
Crennen Lyndsey Elizabeth
22 Jun 2026
CAO
Sell
442
$89.50
$39.56K
Sakys John
16 Jun 2025
CFO
Sell
642
$97.12
$62.35K
Archbold Brian David
16 Jun 2025
SVP Operations
Sell
472
$97.12
$45.84K
Owens Gary M
16 Jun 2025
President and CEO
Sell
1,939
$97.12
$188.31K
Owens Gary M
29 Oct 2024
President and CEO
Sell
2,551
$111.98
$285.65K
Owens Gary M
28 Oct 2024
President and CEO
Sell
2,518
$113.62
$286.09K
Hall Shannon
8 Dec 2022
Director
Sell
230
$174.98
$40.24K
Schmieder John Bradley
11 Nov 2022
Director
Sell
2,500
$175.45
$438.63K
Sakys John
21 Jun 2022
CFO
Sell
722
$188.22
$135.90K
DINOIA GREGORY
21 Jun 2022
SVP Commercial
Sell
555
$188.22
$104.46K
Archbold Brian David
21 Jun 2022
SVP Operations
Sell
392
$188.22
$73.78K
Owens Gary M
21 Jun 2022
President and CEO
Sell
1,756
$188.22
$330.52K
Sakys John
24 Mar 2022
CFO
Sell
670
$251.15
$168.27K
DINOIA GREGORY
8 Nov 2021
SVP Commercial
Sell
280
$323.72
$90.64K
Sullivan John James
1 Oct 2021
Director
Sell
1,250
$304.48
$380.60K
Sullivan John James
1 Sep 2021
Director
Sell
1,250
$268.22
$335.28K
KELLY DAVID M
31 Aug 2021
Director
Sell
603
$267.29
$161.18K
Schmieder John Bradley
11 Aug 2021
Director
Sell
800
$278.06
$222.45K
Archbold Brian David
9 Aug 2021
SVP Continuous Improvement
Sell
639
$280.03
$178.94K
Sullivan John James
2 Aug 2021
Director
Sell
1,250
$290.47
$363.09K
GUILLEMIN EVAN
16 Jul 2021
Director
Sell
720
$282.18
$203.17K
Sullivan John James
1 Jul 2021
Director
Sell
1,250
$267.44
$334.30K
Archbold Brian David
17 Jun 2021
SVP Continuous Improvement
Sell
400
$256.56
$102.62K
GUILLEMIN EVAN
16 Jun 2021
Director
Sell
720
$256.36
$184.58K
Archbold Brian David
16 Jun 2021
SVP Continuous Improvement
Sell
415
$260.14
$107.96K
Archbold Brian David
16 Jun 2021
SVP Continuous Improvement
Sell
921
$255.67
$235.47K
DINOIA GREGORY
16 Jun 2021
SVP Commericial
Sell
1,211
$255.67
$309.62K
Owens Gary M
16 Jun 2021
President and CEO
Sell
6,545
$255.67
$1.67M
Sakys John
16 Jun 2021
CFO
Sell
2,119
$255.67
$541.76K
Schmieder John Bradley
16 Jun 2021
Director
Sell
505
$262.27
$132.45K
Owens Gary M
7 Jun 2021
President and CEO
Sell
1,350
$264.00
$356.40K
Sullivan John James
1 Jun 2021
Director
Sell
2,215
$251.46
$556.98K
GUILLEMIN EVAN
17 May 2021
Director
Sell
720
$244.25
$175.86K
Sullivan John James
6 May 2021
Director
Sell
200
$250.05
$50.01K
Sullivan John James
5 May 2021
Director
Sell
100
$250.59
$25.06K
Sullivan John James
4 May 2021
Director
Sell
735
$250.14
$183.85K
GUILLEMIN EVAN
16 Apr 2021
Director
Sell
720
$253.77
$182.71K
Sullivan John James
5 Apr 2021
Director
Sell
500
$250.76
$125.38K
GUILLEMIN EVAN
16 Mar 2021
Director
Sell
720
$269.48
$194.03K
Sullivan John James
1 Mar 2021
Director
Sell
1,250
$273.94
$342.43K
DINOIA GREGORY
23 Feb 2021
SVP Commericial
Sell
280
$276.75
$77.49K
GUILLEMIN EVAN
16 Feb 2021
Director
Sell
3,600
$281.52
$1.01M
Schmieder John Bradley
10 Feb 2021
Director
Sell
1,750
$278.23
$486.90K
Sullivan John James
1 Feb 2021
Director
Sell
1,250
$277.67
$347.09K
Schmieder John Bradley
12 Jan 2021
Director
Sell
477
$285.23
$136.05K
Sullivan John James
4 Jan 2021
Director
Sell
1,250
$280.82
$351.03K
KELLY DAVID M
11 Dec 2020
Director
Sell
250
$283.18
$70.80K
Sullivan John James
1 Dec 2020
Director
Sell
1,250
$275.22
$344.03K
Sullivan John James
11 Nov 2020
Director
Sell
1,250
$272.36
$340.45K
Owens Gary M
8 Oct 2020
President and CEO
Sell
323
$276.91
$89.44K
Owens Gary M
7 Oct 2020
President and CEO
Sell
677
$275.00
$186.18K
Owens Gary M
6 Oct 2020
President and CEO
Sell
1,000
$265.00
$265.00K
Owens Gary M
16 Sep 2020
President and CEO
Sell
100
$249.32
$24.93K
DINOIA GREGORY
4 Sep 2020
SVP Commerical
Sell
280
$243.55
$68.19K
Archbold Brian David
21 Feb 2020
SVP of Continuous Improvement
Sell
123
$268.19
$32.99K
Schmieder John Bradley
19 Feb 2020
Director
Sell
1,800
$266.46
$479.63K
Dwyer Robert V
13 Feb 2020
Director
Sell
6,133
$258.62
$1.59M
Dwyer Robert V
12 Feb 2020
Director
Sell
1,367
$258.72
$353.67K
GUILLEMIN EVAN
16 Dec 2019
Director
Sell
7,500
$251.31
$1.88M
Schmieder John Bradley
25 Nov 2019
Director
Sell
700
$238.06
$166.64K
Dwyer Robert V
19 Feb 2019
Director
Sell
342
$232.00
$79.34K
Dwyer Robert V
15 Feb 2019
Director
Sell
5,575
$232.00
$1.29M
GUILLEMIN EVAN
12 Feb 2019
Director
Sell
1,500
$228.77
$343.16K
Dwyer Robert V
11 Feb 2019
Director
Sell
1,727
$235.00
$405.85K
Schmieder John Bradley
8 Feb 2019
Director
Sell
2,500
$232.70
$581.75K
Dwyer Robert V
8 Feb 2019
Director
Sell
2,356
$235.05
$553.78K
GUILLEMIN EVAN
10 Dec 2018
Director
Sell
2,000
$208.02
$416.04K
GUILLEMIN EVAN
7 Dec 2018
Director
Sell
8,000
$212.47
$1.70M
GUILLEMIN EVAN
6 Dec 2018
Director
Sell
3,000
$212.50
$637.50K
GUILLEMIN EVAN
4 Dec 2018
Director
Sell
2,000
$218.74
$437.48K
BROOKS MICHAEL T
10 Sep 2018
Director
Sell
2,700
$195.39
$527.55K
Dwyer Robert V
20 Jun 2018
Director
Sell
5,000
$210.03
$1.05M
CAMPBELL H STUART
11 Jun 2018
Director
Sell
989
$191.17
$189.06K
Dwyer Robert V
14 Mar 2018
Director
Sell
5,000
$144.01
$720.05K
Schmieder John Bradley
8 Feb 2018
Director
Sell
3,000
$132.27
$396.81K
CAMPBELL H STUART
21 Aug 2017
Director
Sell
1,000
$130.16
$130.16K
CAMPBELL H STUART
18 Aug 2017
Director
Sell
1,000
$130.00
$130.00K
CAMPBELL H STUART
17 Aug 2017
Director
Sell
1,000
$130.83
$130.83K
CAMPBELL H STUART
15 Aug 2017
Director
Sell
2
$134.10
$268.20
CAMPBELL H STUART
11 Aug 2017
Director
Sell
608
$134.08
$81.52K
CAMPBELL H STUART
10 Aug 2017
Director
Sell
1,000
$136.58
$136.58K
CAMPBELL H STUART
9 Aug 2017
Director
Sell
1,000
$137.61
$137.61K
CAMPBELL H STUART
4 Aug 2017
Director
Sell
1,000
$143.09
$143.09K
CAMPBELL H STUART
3 Aug 2017
Director
Sell
1,000
$143.12
$143.12K
CAMPBELL H STUART
2 Aug 2017
Director
Sell
1,000
$143.61
$143.61K
Dwyer Robert V
16 Jun 2017
Director
Sell
7,150
$139.00
$993.85K
Dwyer Robert V
14 Jun 2017
Director
Sell
4,000
$140.27
$561.08K
KELLY DAVID M
12 Jun 2017
Director
Sell
1,000
$142.00
$142.00K
Adriance Glenn E
9 Jun 2017
CSMO
Sell
4,000
$148.98
$595.92K
BROOKS MICHAEL T
20 Mar 2017
Director
Sell
2,000
$122.94
$245.88K
Dwyer Robert V
22 Feb 2017
Director
Sell
3,300
$125.14
$412.96K
Dwyer Robert V
21 Feb 2017
Director
Sell
1,700
$125.12
$212.70K
Adriance Glenn E
7 Feb 2017
CSMO
Sell
2,625
$123.12
$323.19K
Adriance Glenn E
7 Feb 2017
CSMO
Sell
1,070
$121.65
$130.17K
Schmieder John Bradley
7 Feb 2017
Director
Sell
2,000
$122.90
$245.80K
CAMPBELL H STUART
7 Feb 2017
Director
Sell
8,000
$121.55
$972.40K
Dwyer Robert V
15 Dec 2016
Director
Sell
1,000
$134.00
$134.00K
Dwyer Robert V
14 Dec 2016
Director
Sell
1,002
$132.13
$132.39K
Showing 250 of 252 transactions. The figures above use every one of them.

What was left out

Form 4 filings counted 414
Amendments (4/A) skipped 14
Filings about a different issuer 0
Unreadable filings 0
Joint filings 0
Sales on a Rule 10b5-1 plan 8
Sales straight out of an exercise 79
Sales at will 102
Transactions with no price 0
Shares from compensation/vesting 835,842
Sales filed before the plan box existed 93
History held since 12 Oct 2016