Jane Street
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Jane Street’s Mesa Laboratories MLAB Stock Holding History

Jane Street’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
Q2 		$7.13M Buy
+71,580
New +$7.21M ﹤0.01% 3240
2026
Q1 		– Sell
-56,371
Closed -$4.43M – 12452
2025
Q4 		$4.43M Buy
56,371
+18,144
+47% +$1.38M ﹤0.01% 3425
2025
Q3 		$2.56M Buy
38,227
+24,442
+177% +$1.76M ﹤0.01% 4480
2025
Q2 		$1.3M Buy
13,785
+6,766
+96% +$743K ﹤0.01% 5139
2025
Q1 		$833K Sell
7,019
-27,380
-80% -$3.73M ﹤0.01% 5912
2024
Q4 		$4.54M Buy
34,399
+32,091
+1,390% +$3.94M ﹤0.01% 2799
2024
Q3 		$300K Sell
2,308
-20,134
-90% -$2.37M ﹤0.01% 8040
2024
Q2 		$1.95M Buy
+22,442
New +$2.35M ﹤0.01% 4527
2023
Q4 		– Sell
-3,216
Closed -$338K – 9565
2023
Q3 		$338K Sell
3,216
-3,238
-50% -$415K ﹤0.01% 6892
2023
Q2 		$829K Buy
6,454
+1,360
+27% +$207K ﹤0.01% 5523
2023
Q1 		$890K Buy
5,094
+3,430
+206% +$615K ﹤0.01% 5220
2022
Q4 		$277K Sell
1,664
-1,983
-54% -$311K ﹤0.01% 7152
2022
Q3 		$514K Buy
3,647
+1,562
+75% +$285K ﹤0.01% 6647
2022
Q2 		$425K Buy
+2,085
New +$457K ﹤0.01% 7022
2021
Q4 		– Sell
-1,058
Closed -$320K – 10547
2021
Q3 		$320K Buy
+1,058
New +$301K ﹤0.01% 8057
2021
Q2 		– Sell
-9,620
Closed -$2.34M – 10168
2021
Q1 		$2.34M Buy
9,620
+7,118
+284% +$1.96M ﹤0.01% 3715
2020
Q4 		$717K Buy
+2,502
New +$688K ﹤0.01% 5188
2020
Q3 		– Sell
-1,627
Closed -$353K – 7623
2020
Q2 		$353K Buy
+1,627
New +$375K ﹤0.01% 5597

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
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM
AQR Capital Management
AQR Capital Management Greenwich, Connecticut $287B AUM 42.33% 1-Year Est. Return
RIM
Ranger Investment Management Dallas, Texas $1.58B AUM 51% 1-Year Est. Return
Morgan Stanley
Morgan Stanley New York $1.89T AUM 35.08% 1-Year Est. Return
Diamond Hill Capital Management
Diamond Hill Capital Management Columbus, Ohio $12.5B AUM 7.49% 1-Year Est. Return
Raymond James Financial
Raymond James Financial St Petersburg, Florida $369B AUM 28.27% 1-Year Est. Return
Dimensional Fund Advisors
Dimensional Fund Advisors Austin, Texas $552B AUM 44.19% 1-Year Est. Return

Jane Street's MLAB Position: Q2 2026 in Review

Jane Street opened a new position in Mesa Laboratories (MLAB) in Q2 2026: 71,580 shares worth $7.13M. The stake represents ﹤0.01% of the portfolio and ranks #3240 among its holdings. This is a return to the name: Jane Street previously reported a position in MLAB as recently as Q4 2025.

Jane Street first reported a position in MLAB in Q2 2020 and has held it in 18 quarters since. 159 funds tracked by Wall St. Rank hold MLAB as of Q2 2026.

  • Jane Street held 71,580 shares of Mesa Laboratories worth $7.13M as of Q2 2026.
  • Mesa Laboratories was a new Jane Street position in Q2 2026.
  • Mesa Laboratories made up ﹤0.01% of Jane Street's portfolio in Q2 2026, its #3240 holding.
  • Jane Street first reported a position in Mesa Laboratories in Q2 2020 and has held it in 18 quarters since.
  • 159 funds tracked by Wall St. Rank held Mesa Laboratories as of Q2 2026.

Based on Jane Street's 13F filing for Q2 2026, filed 14 Aug 2026.