Ken Griffin Mesa Laboratories Inc Transaction History

Citadel Advisors LLC

$550 Billion
Q2 2025

A detailed history of Ken Griffin (Citadel Advisors LLC) transactions in Mesa Laboratories Inc stock. As of the latest transaction made, Citadel Advisors LLC holds 26,873 shares of MLAB stock, worth $1.7 Million. This represents 0.0% of its overall portfolio holdings.

Number of Shares

26,873

Previous 6,082 341.84%

Holding current value

$1.7 Million

Previous $721,000 251.04%

% of portfolio

0.0%

Previous 0.0%

27 transactions

Quarter	Operation	Price Per share	shares change	shares Held
Q2 2025 Aug 14, 2025	BUY	$92.73 - $128.0 $1.93 Million - $2.66 Million	20,791 Added 341.84%	26,873 $2.53 Million
Q1 2025 May 15, 2025	SELL	$118.66 - $154.76 $87,215 - $113,748	-735 Reduced 10.78%	6,082 $721,000
Q4 2024 Feb 14, 2025	SELL	$98.59 - $135.91 $384,303 - $529,777	-3,898 Reduced 36.38%	6,817 $898,000
Q3 2024 Nov 14, 2024	SELL	$87.73 - $140.86 $1.23 Million - $1.97 Million	-13,980 Reduced 56.61%	10,715 $1.39 Million
Q2 2024 Aug 14, 2024	SELL	$84.94 - $122.22 $771,679 - $1.11 Million	-9,085 Reduced 26.89%	24,695 $2.14 Million
Q1 2024 May 15, 2024	BUY	$90.62 - $114.1 $590,117 - $743,019	6,512 Added 23.88%	33,780 $3.71 Million
Q4 2023 Feb 14, 2024	BUY	$84.55 - $115.06 $95,541 - $130,017	1,130 Added 4.32%	27,268 $2.86 Million
Q3 2023 Nov 14, 2023	SELL	$104.28 - $143.36 $2.17 Million - $2.99 Million	-20,851 Reduced 44.37%	26,138 $2.75 Million
Q2 2023 Aug 14, 2023	BUY	$125.33 - $184.35 $5.33 Million - $7.85 Million	42,562 Added 961.42%	46,989 $6.04 Million
Q1 2023 May 15, 2023	SELL	$163.15 - $203.76 $7.52 Million - $9.4 Million	-46,111 Reduced 91.24%	4,427 $773,000
Q4 2022 Feb 14, 2023	BUY	$118.55 - $188.84 $3.35 Million - $5.34 Million	28,257 Added 126.82%	50,538 $8.4 Million
Q3 2022 Nov 14, 2022	BUY	$139.58 - $214.98 $2.47 Million - $3.8 Million	17,680 Added 384.26%	22,281 $3.14 Million
Q2 2022 Aug 15, 2022	SELL	$182.13 - $260.0 $1.86 Million - $2.66 Million	-10,229 Reduced 68.98%	4,601 $938,000
Q1 2022 May 16, 2022	BUY	$248.18 - $329.02 $3.3 Million - $4.37 Million	13,291 Added 863.61%	14,830 $3.78 Million
Q4 2021 Feb 14, 2022	SELL	$295.95 - $332.41 $263,691 - $296,177	-891 Reduced 36.67%	1,539 $504,000
Q3 2021 Nov 15, 2021	SELL	$266.92 - $322.44 $852,008 - $1.03 Million	-3,192 Reduced 56.78%	2,430 $735,000
Q2 2021 Aug 16, 2021	SELL	$235.0 - $272.85 $1.29 Million - $1.5 Million	-5,508 Reduced 49.49%	5,622 $1.52 Million
Q1 2021 May 17, 2021	SELL	$243.02 - $297.01 $233,542 - $285,426	-961 Reduced 7.95%	11,130 $2.71 Million
Q4 2020 Feb 16, 2021	BUY	$258.4 - $289.99 $1.78 Million - $1.99 Million	6,877 Added 131.89%	12,091 $3.47 Million
Q3 2020 Nov 16, 2020	SELL	$211.1 - $255.87 $1.66 Million - $2.02 Million	-7,882 Reduced 60.19%	5,214 $1.33 Million
Q2 2020 Aug 14, 2020	BUY	$208.55 - $264.25 $2.12 Million - $2.69 Million	10,174 Added 348.19%	13,096 $2.84 Million
Q1 2020 May 15, 2020	SELL	$190.69 - $270.25 $654,829 - $928,038	-3,434 Reduced 54.03%	2,922 $660,000
Q4 2019 Feb 14, 2020	BUY	$213.21 - $251.5 $1.36 Million - $1.6 Million	6,356 New	6,356 $1.59 Million
Q2 2019 Aug 14, 2019	SELL	$185.45 - $260.0 $737,163 - $1.03 Million	-3,975 Closed	0 $0
Q1 2019 May 15, 2019	BUY	$204.75 - $240.24 $248,976 - $292,131	1,216 Added 44.07%	3,975 $0
Q4 2018 Feb 14, 2019	SELL	$171.0 - $221.34 $94,221 - $121,958	-551 Reduced 16.65%	2,759 $574,000
Q3 2018 Nov 13, 2018	BUY	$181.0 - $222.93 $599,110 - $737,898	3,310 New	3,310 $0

Others Institutions Holding MLAB

# of Institutions

169

Shares Held

5.75M

Call Options Held

Put Options Held

View Full List

About MESA LABORATORIES INC

Ticker MLAB
Exchange NASDAQ
Sector Technology
Industry Scientific & Technical Instruments
Shares Outstandng 5,317,270
Market Cap $336M
Description
Mesa Laboratories, Inc. develops, manufactures, and sells life sciences tools and quality control products and services in the United States, Europe, the Asia Pacific, and internationally. The company's Sterilization and Disinfection Control segment manufactures and sells biological, cleaning, and chemical indicators that are used to assess the ...

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