Primecap Management
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Primecap Management’s Magnite MGNI Stock Holding History

Primecap Management’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
2021
Q4 		– Sell
-266,500
Closed -$7.46M – 344
2021
Q3 		$7.46M Hold
266,500
– – 0.01% 275
2021
Q2 		$9.02M Sell
266,500
-33,500
-11% -$1.14M 0.01% 264
2021
Q1 		$12.5M Hold
300,000
– – 0.01% 255
2020
Q4 		$9.21M Hold
300,000
– – 0.01% 258
2020
Q3 		$2.08M Hold
300,000
– – ﹤0.01% 285
2020
Q2 		$2M Hold
300,000
– – ﹤0.01% 274
2020
Q1 		$1.67M Sell
300,000
-33,600
-10% -$309K ﹤0.01% 265
2019
Q4 		$2.72M Sell
333,600
-291,208
-47% -$2.39M ﹤0.01% 270
2019
Q3 		$5.44M Sell
624,808
-670,992
-52% -$5.88M ﹤0.01% 246
2019
Q2 		$8.24M Hold
1,295,800
– – 0.01% 247
2019
Q1 		$7.88M Sell
1,295,800
-37,000
-3% -$190K 0.01% 246
2018
Q4 		$4.97M Hold
1,332,800
– – ﹤0.01% 251
2018
Q3 		$4.8M Hold
1,332,800
– – ﹤0.01% 265
2018
Q2 		$3.8M Hold
1,332,800
– – ﹤0.01% 258
2018
Q1 		$2.4M Hold
1,332,800
– – ﹤0.01% 266
2017
Q4 		$2.49M Sell
1,332,800
-375,000
-22% -$937K ﹤0.01% 265
2017
Q3 		$6.64M Sell
1,707,800
-260,000
-13% -$1.11M 0.01% 240
2017
Q2 		$10.1M Sell
1,967,800
-315,000
-14% -$1.73M 0.01% 231
2017
Q1 		$13.4M Sell
2,282,800
-632,528
-22% -$4.93M 0.01% 215
2016
Q4 		$21.6M Sell
2,915,328
-501,598
-15% -$3.91M 0.02% 196
2016
Q3 		$28.3M Sell
3,416,926
-940,874
-22% -$10M 0.03% 188
2016
Q2 		$59.5M Buy
4,357,800
+36,500
+0.8% +$588K 0.06% 153
2016
Q1 		$79M Buy
4,321,300
+1,924,400
+80% +$29.5M 0.08% 144
2015
Q4 		$39.4M Buy
2,396,900
+860,600
+56% +$13.3M 0.04% 179
2015
Q3 		$22.3M Buy
1,536,300
+1,420,300
+1,224% +$21.7M 0.02% 195
2015
Q2 		$1.74M Buy
+116,000
New +$2M ﹤0.01% 250

Other funds holding MGNI

Vanguard Group
Vanguard Group Malvern, Pennsylvania $6.9T AUM 27.45% 1-Year Est. Return
Fidelity Investments
Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return
GIM
Granahan Investment Management Waltham, Massachusetts $2.07B AUM 56.45% 1-Year Est. Return
BlackRock
BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return
Allianz Asset Management
Allianz Asset Management Munich, Germany $95.4B AUM 38.74% 1-Year Est. Return
Allspring Global Investments
Allspring Global Investments Charlotte, North Carolina $59.7B AUM 29.08% 1-Year Est. Return
EC
Edenbrook Capital Mt. Kisco, New York $321M AUM 79.21% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return
NTCM
Nine Ten Capital Management Chicago, Illinois $315M AUM 62.95% 1-Year Est. Return
Goldman Sachs
Goldman Sachs New York $871B AUM 31.28% 1-Year Est. Return

Primecap Management's MGNI Position: Q4 2021 in Review

Primecap Management sold out of Magnite (MGNI) in Q4 2021, closing a stake of 266,500 shares — an estimated $7.46M sold.

Primecap Management first reported a position in MGNI in Q2 2015 and held it in 26 quarters. The position peaked at $79M in Q1 2016. 247 funds tracked by Wall St. Rank hold MGNI as of Q4 2021.

  • Primecap Management reported no remaining Magnite position as of Q4 2021 after selling out during the quarter.
  • Primecap Management sold 266,500 Magnite shares in Q4 2021, an estimated $7.46M.
  • Primecap Management first reported a position in Magnite in Q2 2015 and held it in 26 quarters.
  • Primecap Management's Magnite position peaked at $79M in Q1 2016.
  • 247 funds tracked by Wall St. Rank held Magnite as of Q4 2021.

Based on Primecap Management's 13F filing for Q4 2021, filed 11 Feb 2022.