MDU RES GROUP INC

Ticker: MDU CUSIP: 552690109 Class: COM

CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM's Holding History (CIK: 0001081019)

Note: Option positions (PUT/CALL) are excluded.

Q4 2025

Shares 193,444 Value ($000) $3,776 Avg Close $19.57 Range $17.31 - $21.34

Q3 2025

Shares 193,625 Value ($000) $3,448 Avg Close $16.46 Range $15.63 - $17.87

Q2 2025

Shares 193,615 Value ($000) $3,228 Avg Close $16.45 Range $14.69 - $17.49

Q1 2025

Shares 193,291 Value ($000) $3,269 Avg Close $16.76 Range $15.90 - $18.33

Q4 2024

Shares 181,961 Value ($000) $3,279 Avg Close $16.91 Range $14.27 - $19.63

Q3 2024

Shares 185,781 Value ($000) $5,092 Avg Close $13.65 Range $12.67 - $14.89

Q2 2024

Shares 191,359 Value ($000) $4,803 Avg Close $13.17 Range $12.37 - $13.72

Q1 2024

Shares 196,000 Value ($000) $4,939 Avg Close $10.98 Range $9.86 - $13.32

Q4 2023

Shares 207,532 Value ($000) $4,109 Avg Close $9.95 Range $9.41 - $10.65

Q3 2023

Shares 217,699 Value ($000) $4,263 Avg Close $10.78 Range $10.08 - $11.69

Q2 2023

Shares 239,650 Value ($000) $5,018 Avg Close $10.43 Range $9.61 - $10.94

Q1 2023

Shares 255,927 Value ($000) $7,801 Avg Close $10.70 Range $9.98 - $11.37

Q4 2022

Shares 259,787 Value ($000) $7,882 Avg Close $10.27 Range $9.29 - $11.06

Q3 2022

Shares 256,921 Value ($000) $7,027 Avg Close $10.02 Range $8.94 - $11.08

Q2 2022

Shares 262,367 Value ($000) $7,081 Avg Close $9.15 Range $8.51 - $9.69

Q1 2022

Shares 261,626 Value ($000) $6,972 Avg Close $9.45 Range $8.60 - $10.74

Q4 2021

Shares 283,341 Value ($000) $8,738 Avg Close $9.99 Range $9.15 - $10.63

Q3 2021

Shares 337,722 Value ($000) $10,020 Avg Close $10.53 Range $9.83 - $11.13

Q2 2021

Shares 340,819 Value ($000) $10,681 Avg Close $10.95 Range $10.22 - $11.62

Q1 2021

Shares 347,621 Value ($000) $10,988 Avg Close $9.46 Range $8.38 - $10.66

Q4 2020

Shares 349,139 Value ($000) $9,196 Avg Close $8.05 Range $7.18 - $8.74

Q3 2020

Shares 350,000 Value ($000) $7,875 Avg Close $7.32 Range $6.58 - $8.03

Q2 2020

Shares 342,753 Value ($000) $7,602 Avg Close $7.03 Range $5.94 - $8.01

Q1 2020

Shares 332,833 Value ($000) $7,156 Avg Close $8.83 Range $4.81 - $10.26

Q4 2019

Shares 307,924 Value ($000) $9,148 Avg Close $9.10 Range $8.60 - $9.50

Q3 2019

Shares 313,442 Value ($000) $8,836 Avg Close $8.44 Range $7.93 - $9.12

Q2 2019

Shares 312,597 Value ($000) $8,065 Avg Close $7.99 Range $7.59 - $8.30

Q1 2019

Shares 306,980 Value ($000) $7,929 Avg Close $7.90 Range $7.22 - $8.40

Q4 2018

Shares 320,839 Value ($000) $7,649 Avg Close $7.88 Range $7.03 - $8.27

Q3 2018

Shares 323,189 Value ($000) $8,303 Avg Close $8.58 Range $7.77 - $9.02

Q2 2018

Shares 322,969 Value ($000) $9,263 Avg Close $8.49 Range $8.18 - $8.87

Q1 2018

Shares 322,942 Value ($000) $9,094 Avg Close $8.03 Range $7.29 - $8.53

Q4 2017

Shares 333,178 Value ($000) $8,956 Avg Close $8.04 Range $7.71 - $8.41

Q3 2017

Shares 331,223 Value ($000) $8,595 Avg Close $7.77 Range $7.44 - $8.20

Q2 2017

Shares 358,057 Value ($000) $9,381 Avg Close $7.92 Range $7.51 - $8.25

Q1 2017

Shares 397,547 Value ($000) $10,880 Avg Close $8.03 Range $7.53 - $8.67

Q4 2016

Shares 415,047 Value ($000) $11,941 Avg Close $7.89 Range $7.09 - $8.72

Q3 2016

Shares 425,847 Value ($000) $10,834 Avg Close $6.91 Range $6.46 - $7.47

Q2 2016

Shares 422,247 Value ($000) $10,134 Avg Close $6.12 Range $5.33 - $6.90

Q1 2016

Shares 425,351 Value ($000) $8,277 Avg Close $5.02 Range $4.40 - $5.57

Q4 2015

Shares 372,386 Value ($000) $6,822 Avg Close $5.10 Range $4.59 - $5.49

Q3 2015

Shares 366,575 Value ($000) $6,305 Avg Close $4.95 Range $4.48 - $5.44

Q2 2015

Shares 355,724 Value ($000) $6,947 Avg Close $5.79 Range $5.30 - $6.32

Q1 2015

Shares 362,279 Value ($000) $7,731 Avg Close $6.06 Range $5.47 - $6.65

Q4 2014

Shares 368,366 Value ($000) $8,657 Avg Close $6.84 Range $5.78 - $7.67

Q3 2014

Shares 364,903 Value ($000) $10,148 Avg Close $8.38 Range $7.36 - $9.47

Q2 2014

Shares 349,883 Value ($000) $12,281 Avg Close $9.15 Range $8.68 - $9.59

Q1 2014

Shares 343,483 Value ($000) $11,785 Avg Close $8.65 Range $7.84 - $9.29

Q4 2013

Shares 341,883 Value ($000) $10,445 Avg Close $7.80 Range $7.24 - $8.15

Q3 2013

Shares 395,030 Value ($000) $11,049 Avg Close $7.25 Range $6.78 - $7.90

Q2 2013

Shares 329,052 Value ($000) $8,526 Avg Close $6.58 Range $6.07 - $7.05

Q1 2013

Shares 328,245 Value ($000) $8,203 Avg Close $6.06 Range $5.54 - $6.49

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	193,444	$3,776	$19.57	$17.31 - $21.34
Q3 2025	193,625	$3,448	$16.46	$15.63 - $17.87
Q2 2025	193,615	$3,228	$16.45	$14.69 - $17.49
Q1 2025	193,291	$3,269	$16.76	$15.90 - $18.33
Q4 2024	181,961	$3,279	$16.91	$14.27 - $19.63
Q3 2024	185,781	$5,092	$13.65	$12.67 - $14.89
Q2 2024	191,359	$4,803	$13.17	$12.37 - $13.72
Q1 2024	196,000	$4,939	$10.98	$9.86 - $13.32
Q4 2023	207,532	$4,109	$9.95	$9.41 - $10.65
Q3 2023	217,699	$4,263	$10.78	$10.08 - $11.69
Q2 2023	239,650	$5,018	$10.43	$9.61 - $10.94
Q1 2023	255,927	$7,801	$10.70	$9.98 - $11.37
Q4 2022	259,787	$7,882	$10.27	$9.29 - $11.06
Q3 2022	256,921	$7,027	$10.02	$8.94 - $11.08
Q2 2022	262,367	$7,081	$9.15	$8.51 - $9.69
Q1 2022	261,626	$6,972	$9.45	$8.60 - $10.74
Q4 2021	283,341	$8,738	$9.99	$9.15 - $10.63
Q3 2021	337,722	$10,020	$10.53	$9.83 - $11.13
Q2 2021	340,819	$10,681	$10.95	$10.22 - $11.62
Q1 2021	347,621	$10,988	$9.46	$8.38 - $10.66
Q4 2020	349,139	$9,196	$8.05	$7.18 - $8.74
Q3 2020	350,000	$7,875	$7.32	$6.58 - $8.03
Q2 2020	342,753	$7,602	$7.03	$5.94 - $8.01
Q1 2020	332,833	$7,156	$8.83	$4.81 - $10.26
Q4 2019	307,924	$9,148	$9.10	$8.60 - $9.50
Q3 2019	313,442	$8,836	$8.44	$7.93 - $9.12
Q2 2019	312,597	$8,065	$7.99	$7.59 - $8.30
Q1 2019	306,980	$7,929	$7.90	$7.22 - $8.40
Q4 2018	320,839	$7,649	$7.88	$7.03 - $8.27
Q3 2018	323,189	$8,303	$8.58	$7.77 - $9.02
Q2 2018	322,969	$9,263	$8.49	$8.18 - $8.87
Q1 2018	322,942	$9,094	$8.03	$7.29 - $8.53
Q4 2017	333,178	$8,956	$8.04	$7.71 - $8.41
Q3 2017	331,223	$8,595	$7.77	$7.44 - $8.20
Q2 2017	358,057	$9,381	$7.92	$7.51 - $8.25
Q1 2017	397,547	$10,880	$8.03	$7.53 - $8.67
Q4 2016	415,047	$11,941	$7.89	$7.09 - $8.72
Q3 2016	425,847	$10,834	$6.91	$6.46 - $7.47
Q2 2016	422,247	$10,134	$6.12	$5.33 - $6.90
Q1 2016	425,351	$8,277	$5.02	$4.40 - $5.57
Q4 2015	372,386	$6,822	$5.10	$4.59 - $5.49
Q3 2015	366,575	$6,305	$4.95	$4.48 - $5.44
Q2 2015	355,724	$6,947	$5.79	$5.30 - $6.32
Q1 2015	362,279	$7,731	$6.06	$5.47 - $6.65
Q4 2014	368,366	$8,657	$6.84	$5.78 - $7.67
Q3 2014	364,903	$10,148	$8.38	$7.36 - $9.47
Q2 2014	349,883	$12,281	$9.15	$8.68 - $9.59
Q1 2014	343,483	$11,785	$8.65	$7.84 - $9.29
Q4 2013	341,883	$10,445	$7.80	$7.24 - $8.15
Q3 2013	395,030	$11,049	$7.25	$6.78 - $7.90
Q2 2013	329,052	$8,526	$6.58	$6.07 - $7.05
Q1 2013	328,245	$8,203	$6.06	$5.54 - $6.49