SEC 13F Intelligence

Granahan Investment Management, LLC / MGNI

Granahan Investment Management, LLC’s Magnite Inc Position

Does Granahan Investment Management, LLC own Magnite Inc (MGNI)? Yes — 2.55M shares worth $30M (+1.47% of its 13F portfolio) as of Q1 2026, down from 3.12M shares the prior filed quarter.

Position Value
$30M
Q1 2026
Shares
2.55M
% of Portfolio
+1.47%
Quarters Held
24
currently held

Position History MGNI

Reported value by quarter
Q2 ’20: $52MQ2 ’20Q3 ’20: $70MQ4 ’20: $206MQ1 ’21: $213MQ1 ’21Q2 ’21: $219MQ3 ’21: $201MQ4 ’21: $148MQ4 ’21Q1 ’22: $121MQ2 ’22: $84MQ3 ’22: $68MQ3 ’22Q4 ’22: $111MQ1 ’23: $85MQ2 ’23: $103MQ2 ’23Q3 ’23: $54MQ4 ’23: $63MQ1 ’24: $58MQ1 ’24Q2 ’24: $70MQ3 ’24: $55MQ4 ’24: $58MQ4 ’24Q1 ’25: $30MQ2 ’25: $88MQ3 ’25: $84MQ3 ’25Q4 ’25: $51MQ1 ’26: $30Mfilingsflow.com
QuarterSharesValue% of Portfolio
Q1 20262.55M$30M+1.47%
Q4 20253.12M$51M+2.17%
Q3 20253.87M$84M+3.45%
Q2 20253.64M$88M+3.58%
Q1 20252.65M$30M+1.51%
Q4 20243.61M$58M+2.40%
Q3 20244.00M$55M+2.18%
Q2 20245.23M$70M+2.78%
Q1 20245.44M$58M+2.05%
Q4 20236.73M$63M+2.08%
Q3 20237.20M$54M+1.94%
Q2 20237.55M$103M+3.17%
Q1 20239.13M$85M+2.57%
Q4 202210.45M$111M+3.39%
Q3 202210.42M$68M+2.23%
Q2 20229.50M$84M+2.88%
Q1 20229.13M$121M+2.99%
Q4 20218.48M$148M+3.06%
Q3 20217.16M$201M+3.81%
Q2 20216.47M$219M+4.08%
Q1 20215.11M$213M+4.51%
Q4 20206.72M$206M+4.63%
Q3 202010.02M$70M+2.36%
Q2 20207.86M$52M+1.89%

Common-stock position only; options are excluded. Quarters where the fund filed no 13F or reported no position are absent. See Granahan Investment Management, LLC’s full portfolio or all institutional holders of MGNI.