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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

78
Insider
Date
Role
Action
Shares
Price
Amount
Owens Gary M
19 Mar 2025
President and CEO
Sold after exercise
21,000
$123.91
$2.60M
Owens Gary M
1 Sep 2023
President and CEO
Sold after exercise
2,000
$142.82
$285.64K
Sakys John
24 Mar 2023
CFO
Sold after exercise
1,128
$167.01
$188.39K
Sakys John
24 Mar 2023
CFO
Sold after exercise
1,000
$167.01
$167.01K
Sakys John
22 Mar 2023
CFO
Sold after exercise
2,500
$171.62
$429.05K
Sakys John
15 Mar 2023
CFO
Sold after exercise
1,000
$165.71
$165.71K
Sakys John
9 Mar 2023
CFO
Sold after exercise
400
$169.97
$67.99K
Sakys John
9 Feb 2023
CFO
Sold after exercise
1,000
$184.27
$184.27K
Sakys John
23 Jan 2023
CFO
Sold after exercise
2,100
$210.19
$441.40K
Schmieder John Bradley
13 Jan 2023
Director
Sold after exercise
1,571
$191.31
$300.55K
GUILLEMIN EVAN
18 Aug 2022
Director
Sold after exercise
3,692
$196.12
$724.08K
Sakys John
16 Aug 2022
CFO
Sold after exercise
1,372
$200.58
$275.20K
Sakys John
15 Aug 2022
CFO
Sold after exercise
628
$200.54
$125.94K
Sullivan John James
7 Jun 2022
Director
Sold after exercise
5,192
$207.76
$1.08M
Sakys John
20 Apr 2022
CFO
Sold after exercise
72
$250.44
$18.03K
Sakys John
23 Mar 2022
CFO
Sold after exercise
930
$251.29
$233.70K
Sullivan John James
15 Feb 2022
Director
Sold after exercise
5,192
$259.42
$1.35M
Schmieder John Bradley
3 Jan 2022
Director
Sold after exercise
1,000
$327.77
$327.77K
Archbold Brian David
14 Dec 2021
SVP Operations
Sold after exercise
1,659
$325.02
$539.21K
Sakys John
10 Dec 2021
CFO
Sold after exercise
1,758
$324.74
$570.89K
GUILLEMIN EVAN
2 Dec 2021
Director
Sold after exercise
2,320
$310.61
$720.62K
Sullivan John James
15 Nov 2021
Director
Sold after exercise
5,192
$308.02
$1.60M
Sakys John
11 Nov 2021
CFO
Sold after exercise
1,000
$317.12
$317.12K
KELLY DAVID M
8 Nov 2021
Director
Sold after exercise
18
$324.07
$5.83K
Sakys John
20 Oct 2021
CFO
Sold after exercise
2,000
$309.86
$619.72K
Sakys John
10 Sep 2021
CFO
Sold after exercise
1,400
$270.21
$378.29K
Sullivan John James
16 Aug 2021
Director
Sold after exercise
5,192
$272.16
$1.41M
Sakys John
12 Aug 2021
CFO
Sold after exercise
1,000
$275.16
$275.16K
Sakys John
12 Jul 2021
CFO
Sold after exercise
1,000
$278.77
$278.77K
Sakys John
1 Jul 2021
CFO
Sold after exercise
1,000
$267.04
$267.04K
Sullivan John James
8 Jun 2021
Director
Sold after exercise
5,192
$258.19
$1.34M
DINOIA GREGORY
4 Jun 2021
SVP Commercial
Sold after exercise
540
$260.27
$140.55K
KELLY DAVID M
4 Jun 2021
Director
Sold after exercise
851
$260.28
$221.50K
Sakys John
12 Mar 2021
CFO
Sold after exercise
2,500
$263.84
$659.60K
Archbold Brian David
10 Mar 2021
SVP Continuous Improvement
Sold after exercise
223
$271.78
$60.61K
Sakys John
6 Jan 2021
CFO
Sold after exercise
16
$290.00
$4.64K
Sakys John
17 Nov 2020
CFO
Sold after exercise
984
$290.00
$285.36K
KELLY DAVID M
16 Nov 2020
Director
Sold after exercise
704
$283.31
$199.45K
GUILLEMIN EVAN
13 Nov 2020
Director
Sold after exercise
2,050
$274.30
$562.32K
GUILLEMIN EVAN
12 Nov 2020
Director
Sold after exercise
950
$273.77
$260.08K
Archbold Brian David
9 Nov 2020
SVP Continuous Improvement
Sold after exercise
533
$272.11
$145.03K
Sakys John
8 Oct 2020
CFO
Sold after exercise
942
$276.90
$260.84K
DINOIA GREGORY
2 Oct 2020
SVP Commercial
Sold after exercise
62
$260.00
$16.12K
DINOIA GREGORY
2 Oct 2020
SVP Commercial
Sold after exercise
270
$260.00
$70.20K
Sakys John
2 Sep 2020
CFO
Sold after exercise
702
$251.42
$176.50K
Sakys John
1 Sep 2020
CFO
Sold after exercise
298
$250.00
$74.50K
KELLY DAVID M
31 Aug 2020
Director
Sold after exercise
600
$245.00
$147.00K
KELLY DAVID M
28 Aug 2020
Director
Sold after exercise
180
$244.00
$43.92K
DINOIA GREGORY
17 Aug 2020
SVP Commercial
Sold after exercise
835
$245.70
$205.16K
KELLY DAVID M
17 Aug 2020
Director
Sold after exercise
800
$247.72
$198.18K
Sakys John
14 Aug 2020
CFO
Sold after exercise
1,000
$244.00
$244.00K
Schmieder John Bradley
12 Aug 2020
Director
Sold after exercise
1,429
$246.29
$351.95K
KELLY DAVID M
10 Aug 2020
Director
Sold after exercise
942
$250.00
$235.50K
KELLY DAVID M
10 Aug 2020
Director
Sold after exercise
85
$250.00
$21.25K
KELLY DAVID M
10 Aug 2020
Director
Sold after exercise
344
$250.00
$86.00K
Archbold Brian David
10 Aug 2020
SVP Continuous Improvement
Sold after exercise
38
$250.00
$9.50K
Archbold Brian David
10 Aug 2020
SVP Continuous Improvement
Sold after exercise
420
$250.00
$105.00K
Archbold Brian David
10 Aug 2020
SVP Continuous Improvement
Sold after exercise
145
$250.00
$36.25K
Sullivan John James
27 Feb 2020
Director
Sold after exercise
1,702
$256.02
$435.75K
Sullivan John James
26 Feb 2020
Director
Sold after exercise
1,070
$263.39
$281.83K
Sullivan John James
25 Feb 2020
Director
Sold after exercise
8,206
$267.09
$2.19M
KELLY DAVID M
19 Mar 2019
Director
Sold after exercise
684
$230.00
$157.32K
GUILLEMIN EVAN
20 Feb 2019
Director
Sold after exercise
1,746
$232.31
$405.61K
GUILLEMIN EVAN
13 Feb 2019
Director
Sold after exercise
1,254
$233.10
$292.31K
GUILLEMIN EVAN
11 Feb 2019
Director
Sold after exercise
500
$230.45
$115.23K
KELLY DAVID M
6 Feb 2019
Director
Sold after exercise
2,000
$229.62
$459.24K
KELLY DAVID M
6 Dec 2018
Director
Sold after exercise
1,700
$210.94
$358.60K
KELLY DAVID M
13 Sep 2018
Director
Sold after exercise
700
$190.01
$133.01K
Sakys John
15 Aug 2018
CFO
Sold after exercise
1,000
$203.50
$203.50K
Sullivan John James
15 Jun 2018
Director
Sold after exercise
12,000
$197.02
$2.36M
Sullivan John James
16 Feb 2018
Director
Sold after exercise
2,123
$138.00
$292.97K
Sullivan John James
15 Feb 2018
Director
Sold after exercise
1,877
$138.00
$259.03K
Sullivan John James
21 Feb 2017
President and CEO
Sold after exercise
6,918
$125.21
$866.20K
Sullivan John James
17 Feb 2017
President and CEO
Sold after exercise
2,160
$123.60
$266.98K
Sullivan John James
13 Feb 2017
President and CEO
Sold after exercise
5,922
$123.99
$734.27K
Adriance Glenn E
6 Feb 2017
CSMO
Sold after exercise
4,375
$125.38
$548.54K
Adriance Glenn E
23 Nov 2016
CMSO
Sold after exercise
3,567
$135.93
$484.86K
Sakys John
17 Nov 2016
CFO
Sold after exercise
221
$131.16
$28.99K
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