Janus Henderson Group
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Janus Henderson Group’s Mesa Laboratories MLAB Stock Holding History

Janus Henderson Group’s Portfolio MLAB Stock Details MLAB Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q1 		$6.14M Sell
69,401
-47,241
-41% -$4.07M ﹤0.01% 899
2025
Q4 		$9.16M Sell
116,642
-29,012
-20% -$2.21M ﹤0.01% 765
2025
Q3 		$9.76M Buy
145,654
+32,369
+29% +$2.33M ﹤0.01% 754
2025
Q2 		$10.7M Buy
113,285
+32,541
+40% +$3.57M 0.01% 709
2025
Q1 		$9.65M Sell
80,744
-5,542
-6% -$755K 0.01% 715
2024
Q4 		$11.4M Buy
86,286
+8,092
+10% +$993K 0.01% 704
2024
Q3 		$10.2M Sell
78,194
-35,825
-31% -$4.21M 0.01% 685
2024
Q2 		$9.89M Buy
114,019
+111,711
+4,840% +$11.7M 0.01% 671
2024
Q1 		$253K Sell
2,308
-1
-0% -$101 ﹤0.01% 2306
2023
Q4 		$242K Sell
2,309
-4
-0.2% -$390 ﹤0.01% 2358
2023
Q3 		$243K Buy
2,313
+1
+0% +$128 ﹤0.01% 2283
2023
Q2 		$297K Sell
2,312
-2
-0.1% -$305 ﹤0.01% 2253
2023
Q1 		$404K Buy
+2,314
New +$415K ﹤0.01% 2134
2022
Q3 		– Sell
-1,040
Closed -$212K – 2411
2022
Q2 		$212K Sell
1,040
-1
-0.1% -$219 ﹤0.01% 2273
2022
Q1 		$265K Buy
1,041
+1
+0.1% +$272 ﹤0.01% 2296
2021
Q4 		$342K Buy
+1,040
New +$326K ﹤0.01% 2129

Other funds holding MLAB

LPP
Long Path Partners Stamford, Connecticut $235M AUM 22.51% 1-Year Est. Return
BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
Boston Partners
Boston Partners Boston, Massachusetts $113B AUM 38.87% 1-Year Est. Return
Select Equity Group
Select Equity Group New York $20.2B AUM 17.52% 1-Year Est. Return
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM
RIM
Ranger Investment Management Dallas, Texas $1.58B AUM 51% 1-Year Est. Return
AQR Capital Management
AQR Capital Management Greenwich, Connecticut $287B AUM 42.33% 1-Year Est. Return
Morgan Stanley
Morgan Stanley New York $1.89T AUM 35.08% 1-Year Est. Return
RA
Royce & Associates New York $12.4B AUM 64.17% 1-Year Est. Return
Diamond Hill Capital Management
Diamond Hill Capital Management Columbus, Ohio $12.5B AUM 7.49% 1-Year Est. Return

Janus Henderson Group's MLAB Position: Q1 2026 in Review

Janus Henderson Group reduced its Mesa Laboratories (MLAB) stake by 41% in Q1 2026, selling an estimated $4.07M and leaving 69,401 shares worth $6.14M. The position accounts for ﹤0.01% of the portfolio, ranked #899.

Janus Henderson Group first reported a position in MLAB in Q4 2021 and has held it in 16 quarters since. The position peaked at $11.4M in Q4 2024. 161 funds tracked by Wall St. Rank hold MLAB as of Q1 2026.

  • Janus Henderson Group held 69,401 shares of Mesa Laboratories worth $6.14M as of Q1 2026.
  • Janus Henderson Group sold 47,241 Mesa Laboratories shares in Q1 2026, an estimated $4.07M.
  • Mesa Laboratories made up ﹤0.01% of Janus Henderson Group's portfolio in Q1 2026, its #899 holding.
  • Janus Henderson Group first reported a position in Mesa Laboratories in Q4 2021 and has held it in 16 quarters since.
  • Janus Henderson Group's Mesa Laboratories position peaked at $11.4M in Q4 2024.
  • 161 funds tracked by Wall St. Rank held Mesa Laboratories as of Q1 2026.

Based on Janus Henderson Group's 13F filing for Q1 2026, filed 15 May 2026.