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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

6
Insider
Date
Role
Action
Shares
Price
Amount
Tripeny R Tony
13 Aug 2026
Director
Buy
900
$113.69
$102.32K
Kadia Siddhartha
13 Aug 2026
President and CEO
Buy indirect
7,093
$112.80
$800.09K
Tripeny R Tony
10 Mar 2026
Director
Buy
1,315
$76.00
$99.94K
Capone Mark Christopher
10 Mar 2026
Director
Buy
1,301
$76.35
$99.33K
Ladiwala Shiraz Shabanali
10 Mar 2026
Director
Buy
3,500
$72.23
$252.81K
Tripeny R Tony
9 Aug 2022
Director
Buy
500
$200.00
$100.00K
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