Comparable stake leader
Conestoga Capital Advisors, LLC
SEC ownership of MESA LABORATORIES INC /CO/
Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0000724004.
Disclosed value leader
Conestoga Capital Advisors, LLC
Comparable rows
50/50
Latest evidence
31 Mar 2026
- Public ticker
- MLAB on Nasdaq
- Parsed ownership sources
-
13D/G and 13F
Source: Parsed SEC ownership filingsUse: Compare filing families carefully
- Largest SEC-reported holder
-
Conestoga Capital Advisors, LLC
Ranking: Comparable ownership first, then disclosed value
- Comparable ownership rows
-
50 of 50
Meaning: Rows with safely comparable ownership %
- Latest 13D/G holder
-
Conestoga Capital Advisors, LLC
Source: Latest parsed Schedule 13D/G stake
- Latest parsed ownership date
-
31 Mar 2026
Freshness: Most recent filing date in this holder set
- Issuer CIK
- 0000724004
- Issuer location
- Lakewood, CO
Ownership snapshot
CIK-linked ownership evidence from parsed SEC filings.
3 signals
Issuer
Names, identifiers, and filing context for this profile.
2 identity fields
Ownership snapshot
Top shareholders of MESA LABORATORIES INC /CO/ (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.
Comparable stake leader
Conestoga Capital Advisor...
Disclosed value leader
Conestoga Capital Advisor...
Comparable rows
50/50
Latest evidence
31 Mar 2026
13D/G
13F
Lead comparable stake: 11%
13D/G row: Conestoga Capital Advisors, LLC
Showing 1-8 of 50 holder rows.
Quick read
Conestoga Capital Advisors, LLC leads the comparable SEC ownership view at 11%.
50 of 50 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.
Open SEC evidence
Opens Conestoga Capital Advisors, LLC's linked filing trail.
Comparable ownership
Top 5
Conestoga Capital Advisors, LLC
11%
Long Path Smaller Companies Fund, LP
7.3%
BlackRock, Inc.
6.9%
ROYCE & ASSOCIATES LP
5%
Long Path Partners LP
7.3%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-8 of 50 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| Conestoga Capital Advisors, LLC |
13D/G
Conestoga Capital Advisors
|
11%
|
$71,997,569
618,111 shares
|
$0 | 31 Dec 2024 |
| Long Path Smaller Companies Fund, LP |
13D/G
|
7.3%
|
$35,870,044
405,583 shares
|
+$8,302,813 | 31 Mar 2026 |
| BlackRock, Inc. |
13F
13D/G
Company
|
6.9%
from 13D/G
|
$34,824,305
393,851 shares
|
— | 31 Mar 2026 |
| ROYCE & ASSOCIATES LP |
13D/G
13F
Company
|
5%
|
$31,579,825
271,118 shares
|
-$1,874,047 | 31 Mar 2025 |
| Long Path Partners LP |
13F
Company
|
7.3%
|
$35,861,649
405,583 shares
|
— | 31 Mar 2026 |
| Boston Partners |
13F
Company
|
4.8%
|
$23,762,126
268,711 shares
|
— | 31 Mar 2026 |
| Select Equity Group, L.P. |
13F
Company
|
4.2%
|
$20,856,952
235,885 shares
|
— | 31 Mar 2026 |
| VANGUARD CAPITAL MANAGEMENT LLC |
13F
Company
|
4.2%
|
$20,570,294
232,643 shares
|
— | 31 Mar 2026 |
How to read this table
Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
Forms 3/4/5 flow
Insider trading overview
Net insider flow leans to selling over the last 12 months. Net value: -$318,050.
Buys
$452,076
Insiders: 3
Sells
$770,126
Insiders: 3
Net
-$318,050
Shares: -2,161
Window
Last 12 months
4 rolling buckets
Buy value
Sell value
Shares: 6,116
Shares: 8,277
| Window (months) | Buy shares | Sell shares | Buy value | Sell value | Net value |
|---|---|---|---|---|---|
| 0-3 | 0 | 8,277 | $0 | $770,126 | -$770,126 |
| 3-6 | 6,116 | 0 | $452,076 | $0 | +$452,076 |
| 6-9 | 0 | 0 | $0 | $0 | $0 |
| 9-12 | 0 | 0 | $0 | $0 | $0 |
Reporting owners
Insider holders from Forms 3/4/5
Showing 1-16 of 16 reporting-owner rows connected to MESA LABORATORIES INC /CO/. Open a relationship link for the CIK-to-CIK filing trail.
Rows
16
Largest Forms 3/4/5 holder
Gary M. Owens
Net 12M change
-$318,050
Latest report
18 Jun 2026
| Name | Relationship | Holdings Value | Past Year Net Change | Change % | Valuation | Report Date |
|---|---|---|---|---|---|---|
| Gary M. Owens | President and CEO | $7,737,724 | Mixed | 31 Mar 2026 | ||
| John Bradley Schmieder | Director | $7,051,714 | Mixed | 14 Sep 2023 | ||
| John James Sullivan | Director | $5,737,069 | Mixed | 02 Dec 2025 | ||
| MESA LABORATORIES INC /CO/ | Director | $3,350,351 | Mixed | 15 Jun 2022 | ||
| Evan Guillemin | Director | $3,281,699 | Mixed | 01 Sep 2022 | ||
| John Sakys | Cfo | $2,889,815 | -$376,872 | -12% | Mixed | 18 Jun 2026 |
| Brian David Archbold | SVP Operations | $1,462,847 | -$341,745 | -19% | Mixed | 18 Jun 2026 |
| Shiraz Shabanali Ladiwala | Director | $794,144 | +$252,805 | +47% | Mixed | 10 Mar 2026 |
| R. Tony Tripeny | Director | $538,854 | +$99,940 | +23% | Mixed | 10 Mar 2026 |
| Jennifer Sadie Alltoft | Director | $503,138 | Mixed | 15 Aug 2025 | ||
| Gregory Dinoia | SVP Commercial | $496,105 | Mixed | 17 Jun 2022 | ||
| Shannon Hall | Director | $450,237 | Mixed | 15 Aug 2025 | ||
| Mark Christopher Capone | Director | $390,410 | +$99,331 | +34% | Mixed | 10 Mar 2026 |
| David M. Kelly | Director | $292,136 | Mixed | 08 Nov 2021 | ||
| Lyndsey Elizabeth Crennen | Cao | $180,794 | -$51,509 | -22% | Filing P/S | 18 Jun 2026 |
| Siddhartha Kadia | President and CEO | Mixed | 14 Apr 2026 |
Recent insider transactions for MESA LABORATORIES INC /CO/
Showing up to 300 recent insider transactions from the last 12 months.
| Insider | Symbol | Class | Transaction | % | SEC-reported value | SEC-reported price | Shares | Shares owned | Date | Ownership |
|---|---|---|---|---|---|---|---|---|---|---|
| Lyndsey Elizabeth Crennen | MLAB | Common Stock | Sale | -18% | $39,560 | $89.50 | -442 | 2,020 | 22 Jun 2026 | Direct |
| Brian David Archbold | MLAB | Common Stock | Sale | -28.3% | $225,187 | $89.50 | -2,516 | 6,377 | 22 Jun 2026 | Direct |
| John Sakys | MLAB | Common Stock | Sale | -12.5% | $253,022 | $89.50 | -2,827 | 19,785 | 22 Jun 2026 | Direct |
| Lyndsey Elizabeth Crennen | MLAB | Common Stock | Award | 12% | 263 | 2,462 | 18 Jun 2026 | Direct | ||
| Lyndsey Elizabeth Crennen | MLAB | Common Stock | Options Exercise | 49.3% | 726 | 2,199 | 18 Jun 2026 | Direct | ||
| Lyndsey Elizabeth Crennen | MLAB | Restricted Stock Units - 3 | Options Exercise | -50.1% | -368 | 367 | 18 Jun 2026 | Direct | ||
| Lyndsey Elizabeth Crennen | MLAB | Restricted Stock Units - 2 | Options Exercise | -50.1% | -233 | 232 | 18 Jun 2026 | Direct | ||
| Lyndsey Elizabeth Crennen | MLAB | Restricted Stock Unit - 1 | Options Exercise | -100% | -125 | 0 | 18 Jun 2026 | Direct | ||
| Brian David Archbold | MLAB | Common Stock | Award | 26.4% | 1,859 | 8,893 | 18 Jun 2026 | Direct | ||
| Brian David Archbold | MLAB | Common Stock | Options Exercise | 89.6% | 3,324 | 7,034 | 18 Jun 2026 | Direct | ||
| Brian David Archbold | MLAB | Restricted Stock Units - 8 | Options Exercise | -50% | -2,480 | 2,480 | 18 Jun 2026 | Direct | ||
| Brian David Archbold | MLAB | Restricted Stock Units - 7 | Options Exercise | -100% | -844 | 0 | 18 Jun 2026 | Direct | ||
| John Sakys | MLAB | Common Stock | Award | 11.2% | 2,282 | 22,612 | 18 Jun 2026 | Direct | ||
| John Sakys | MLAB | Common Stock | Options Exercise | 22.9% | 3,792 | 20,330 | 18 Jun 2026 | Direct | ||
| John Sakys | MLAB | Restricted Stock Units - 7 | Options Exercise | -50% | -2,756 | 2,755 | 18 Jun 2026 | Direct | ||
| John Sakys | MLAB | Restricted Stock Units - 6 | Options Exercise | -100% | -1,036 | 0 | 18 Jun 2026 | Direct | ||
| Brian David Archbold | MLAB | Common Stock | Sale | -23.7% | $116,558 | $101.27 | -1,151 | 3,710 | 16 Jun 2026 | Direct |
| Lyndsey Elizabeth Crennen | MLAB | Common Stock | Sale | -7.42% | $11,950 | $101.27 | -118 | 1,473 | 16 Jun 2026 | Direct |
| John Sakys | MLAB | Common Stock | Sale | -6.89% | $123,850 | $101.27 | -1,223 | 16,538 | 16 Jun 2026 | Direct |
| Brian David Archbold | MLAB | Common Stock | Options Exercise | 102% | 2,454 | 4,861 | 15 Jun 2026 | Direct | ||
| Brian David Archbold | MLAB | Restricted Stock Units - 10 | Award | 4,328 | 4,328 | 15 Jun 2026 | Direct | |||
| Brian David Archbold | MLAB | Restricted Stock Units - 9 | Options Exercise | -33.4% | -2,454 | 4,892 | 15 Jun 2026 | Direct | ||
| Brian David Archbold | MLAB | Non Qualified Stock Options | Expiration of short derivative position | -13.1% | -1,780 | 11,852 | 15 Jun 2026 | Direct | ||
| John Sakys | MLAB | Common Stock | Options Exercise | 18.1% | 2,717 | 17,761 | 15 Jun 2026 | Direct | ||
| John Sakys | MLAB | Restricted Stock Units - 9 | Award | 8,416 | 8,416 | 15 Jun 2026 | Direct | |||
| John Sakys | MLAB | Restricted Stock Units 8 | Options Exercise | -33.4% | -2,717 | 5,416 | 15 Jun 2026 | Direct | ||
| John Sakys | MLAB | Non Qualified Stock Option | Expiration of short derivative position | -20% | -3,951 | 15,755 | 15 Jun 2026 | Direct | ||
| Siddhartha Kadia | MLAB | Restricted Stock Units - 1 | Award | 35,236 | 35,236 | 14 Apr 2026 | Direct | |||
| Gary M. Owens | MLAB | Restricted Stock Unit - 10 | Disposed to Issuer | -33.3% | -8,211 | 16,448 | 31 Mar 2026 | Direct | ||
| Shiraz Shabanali Ladiwala | MLAB | Common Stock | Purchase | 69.7% | $252,805 | $72.23 | 3,500 | 8,523 | 10 Mar 2026 | Direct |
| Mark Christopher Capone | MLAB | Common Stock | Purchase | 61.1% | $99,331 | $76.35 | 1,301 | 3,429 | 10 Mar 2026 | Direct |
| R. Tony Tripeny | MLAB | Common Stock | Purchase | 32.2% | $99,940 | $76.00 | 1,315 | 5,398 | 10 Mar 2026 | Direct |
| John James Sullivan | MLAB | Common Stock | Gift | -7.33% | -2,000 | 25,282 | 02 Dec 2025 | Direct | ||
| Gary M. Owens | MLAB | Common Stock | Options Exercise | 22% | 11,558 | 64,135 | 27 Oct 2025 | Direct | ||
| Shiraz Shabanali Ladiwala | MLAB | Common Stock | Options Exercise | 63.4% | 1,949 | 5,023 | 15 Aug 2025 | Direct | ||
| Shiraz Shabanali Ladiwala | MLAB | Restricted Stock Units - 6 | Award | 3,810 | 3,810 | 15 Aug 2025 | Direct | |||
| Shiraz Shabanali Ladiwala | MLAB | Restricted Stock Units - 5 | Options Exercise | -100% | -1,949 | 0 | 15 Aug 2025 | Direct | ||
| John James Sullivan | MLAB | Common Stock | Options Exercise | 5.43% | 1,404 | 27,282 | 15 Aug 2025 | Direct | ||
| John James Sullivan | MLAB | Restricted Stock Units - 10 | Award | 2,784 | 2,784 | 15 Aug 2025 | Direct | |||
| John James Sullivan | MLAB | Restricted Stock Units - 9 | Options Exercise | -100% | -1,404 | 0 | 15 Aug 2025 | Direct | ||
| Shannon Hall | MLAB | Common Stock | Options Exercise | 50.4% | 1,404 | 4,189 | 15 Aug 2025 | Direct | ||
| Shannon Hall | MLAB | Restricted Stock Units - 8 | Award | 2,784 | 2,784 | 15 Aug 2025 | Direct | |||
| Shannon Hall | MLAB | Restricted Stock Units - 7 | Options Exercise | -100% | -1,404 | 0 | 15 Aug 2025 | Direct | ||
| R. Tony Tripeny | MLAB | Common Stock | Options Exercise | 52.4% | 1,404 | 4,083 | 15 Aug 2025 | Direct | ||
| R. Tony Tripeny | MLAB | Restricted Stock Units - 4 | Award | 2,784 | 2,784 | 15 Aug 2025 | Direct | |||
| R. Tony Tripeny | MLAB | Restricted Stock Units - 3 | Options Exercise | -100% | -1,404 | 0 | 15 Aug 2025 | Direct | ||
| Mark Christopher Capone | MLAB | Common Stock | Options Exercise | 193.9% | 1,404 | 2,128 | 15 Aug 2025 | Direct | ||
| Mark Christopher Capone | MLAB | Restricted Stock Units - 3 | Award | 2,784 | 2,784 | 15 Aug 2025 | Direct | |||
| Mark Christopher Capone | MLAB | Restricted Stock Units - 2 | Options Exercise | -100% | -1,404 | 0 | 15 Aug 2025 | Direct | ||
| Jennifer Sadie Alltoft | MLAB | Common Stock | Options Exercise | 40.4% | 1,404 | 4,878 | 15 Aug 2025 | Direct |
* marks a reported price that did not pass the local price check.