California State Teachers Retirement System (CalSTRS)
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California State Teachers Retirement System (CalSTRS)’s Magnite MGNI Stock Holding History

California State Teachers Retirement System (CalSTRS)’s Portfolio MGNI Stock Details MGNI Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q1 		$2.1M Buy
176,528
+40,004
+29% +$536K ﹤0.01% 1493
2025
Q4 		$2.22M Buy
136,524
+3,943
+3% +$65.4K ﹤0.01% 1361
2025
Q3 		$2.89M Buy
132,581
+6
+0% +$142 ﹤0.01% 1208
2025
Q2 		$3.2M Buy
132,575
+2,514
+2% +$37K ﹤0.01% 1108
2025
Q1 		$1.48M Buy
130,061
+11,387
+10% +$182K ﹤0.01% 1493
2024
Q4 		$1.89M Sell
118,674
-540
-0.5% -$7.92K ﹤0.01% 1438
2024
Q3 		$1.65M Sell
119,214
-3,619
-3% -$49.3K ﹤0.01% 1506
2024
Q2 		$1.63M Sell
122,833
-2,354
-2% -$25.7K ﹤0.01% 1495
2024
Q1 		$1.35M Sell
125,187
-786
-0.6% -$7.85K ﹤0.01% 1644
2023
Q4 		$1.18M Sell
125,973
-5,408
-4% -$42.7K ﹤0.01% 1731
2023
Q3 		$991K Sell
131,381
-32,022
-20% -$345K ﹤0.01% 1798
2023
Q2 		$2.23M Buy
163,403
+8,736
+6% +$97.2K ﹤0.01% 1426
2023
Q1 		$1.43M Sell
154,667
-2,192
-1% -$23.4K ﹤0.01% 1681
2022
Q4 		$1.66M Buy
156,859
+3,012
+2% +$27.5K ﹤0.01% 1591
2022
Q3 		$1.01M Sell
153,847
-4,217
-3% -$33.9K ﹤0.01% 1882
2022
Q2 		$1.4M Sell
158,064
-4,225
-3% -$45.3K ﹤0.01% 1722
2022
Q1 		$2.14M Sell
162,289
-14,187
-8% -$191K ﹤0.01% 1562
2021
Q4 		$3.09M Buy
176,476
+6,127
+4% +$138K ﹤0.01% 1460
2021
Q3 		$4.77M Buy
170,349
+25,619
+18% +$771K 0.01% 1168
2021
Q2 		$4.9M Sell
144,730
-21,995
-13% -$745K 0.01% 1186
2021
Q1 		$6.94M Buy
166,725
+4,050
+2% +$175K 0.01% 987
2020
Q4 		$5M Buy
162,675
+2,386
+1% +$36.1K 0.01% 1113
2020
Q3 		$1.11M Buy
160,289
+4,889
+3% +$32.7K ﹤0.01% 1802
2020
Q2 		$1.04M Buy
155,400
+80,027
+106% +$500K ﹤0.01% 1836
2020
Q1 		$418K Buy
75,373
+873
+1% +$8.02K ﹤0.01% 2154
2019
Q4 		$608K Sell
74,500
-1,747
-2% -$14.4K ﹤0.01% 2247
2019
Q3 		$664K Buy
76,247
+2,458
+3% +$21.5K ﹤0.01% 2163
2019
Q2 		$469K Buy
+73,789
New +$453K ﹤0.01% 2401
2018
Q2 		– Sell
-68,542
Closed -$123K – 3044
2018
Q1 		$123K Sell
68,542
-1,922
-3% -$3.64K ﹤0.01% 2891
2017
Q4 		$132K Sell
70,464
-2,500
-3% -$6.25K ﹤0.01% 2905
2017
Q3 		$284K Sell
72,964
-5,700
-7% -$24.3K ﹤0.01% 2721
2017
Q2 		$404K Buy
78,664
+3,800
+5% +$20.9K ﹤0.01% 2587
2017
Q1 		$441K Sell
74,864
-1,800
-2% -$14K ﹤0.01% 2554
2016
Q4 		$569K Sell
76,664
-2,100
-3% -$16.4K ﹤0.01% 2449
2016
Q3 		$652K Buy
78,764
+700
+0.9% +$7.44K ﹤0.01% 2342
2016
Q2 		$1.07M Buy
78,064
+23,670
+44% +$381K ﹤0.01% 1989
2016
Q1 		$994K Buy
54,394
+6,833
+14% +$105K ﹤0.01% 2024
2015
Q4 		$782K Sell
47,561
-135,266
-74% -$2.09M ﹤0.01% 2145
2015
Q3 		$2.66M Buy
182,827
+28,427
+18% +$434K 0.01% 1350
2015
Q2 		$2.31M Buy
154,400
+139,755
+954% +$2.41M 0.01% 1557
2015
Q1 		$262K Hold
14,645
– – ﹤0.01% 2794
2014
Q4 		$236K Buy
14,645
+62
+0.4% +$800 ﹤0.01% 2876
2014
Q3 		$171K Buy
14,583
+183
+1% +$2K ﹤0.01% 2938
2014
Q2 		$185K Buy
+14,400
New +$216K ﹤0.01% 2950

Other funds holding MGNI

BlackRock
BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return
Wellington Management Group
Wellington Management Group Boston, Massachusetts $535B AUM 26.23% 1-Year Est. Return
VPM
Vanguard Portfolio Management Malvern, Pennsylvania $1.91T AUM
VCM
Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM
Capital Research Global Investors
Capital Research Global Investors Los Angeles, California $645B AUM 30.41% 1-Year Est. Return
Boston Partners
Boston Partners Boston, Massachusetts $95.5B AUM 28.4% 1-Year Est. Return
American Century Companies
American Century Companies Kansas City, Missouri $194B AUM 35% 1-Year Est. Return
Fidelity Investments
Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return
Dimensional Fund Advisors
Dimensional Fund Advisors Austin, Texas $481B AUM 30.42% 1-Year Est. Return
N
Nuveen Charlotte, North Carolina $369B AUM 31.66% 1-Year Est. Return

California State Teachers Retirement System (CalSTRS)'s MGNI Position: Q1 2026 in Review

California State Teachers Retirement System (CalSTRS) increased its Magnite (MGNI) stake by 29% in Q1 2026, buying an estimated $536K and bringing the position to 176,528 shares worth $2.1M. The position accounts for ﹤0.01% of the portfolio, ranked #1493.

California State Teachers Retirement System (CalSTRS) first reported a position in MGNI in Q2 2014 and has held it in 44 quarters since. The position peaked at $6.94M in Q1 2021. 296 funds tracked by Wall St. Rank hold MGNI as of Q1 2026.

  • California State Teachers Retirement System (CalSTRS) held 176,528 shares of Magnite worth $2.1M as of Q1 2026.
  • California State Teachers Retirement System (CalSTRS) bought 40,004 Magnite shares in Q1 2026, an estimated $536K.
  • Magnite made up ﹤0.01% of California State Teachers Retirement System (CalSTRS)'s portfolio in Q1 2026, its #1493 holding.
  • California State Teachers Retirement System (CalSTRS) first reported a position in Magnite in Q2 2014 and has held it in 44 quarters since.
  • California State Teachers Retirement System (CalSTRS)'s Magnite position peaked at $6.94M in Q1 2021.
  • 296 funds tracked by Wall St. Rank held Magnite as of Q1 2026.

Based on California State Teachers Retirement System (CalSTRS)'s 13F filing for Q1 2026, filed 18 May 2026.