ILLUMINA INC (ILMN) Stock Institutional Trading Activity


ILLUMINA INC (ILMN) position changes reported by tracked institutional filers across multiple SEC 13F reporting periods. Based on recent SEC 13F filings (Q4 2025), investors with some of the largest reported share count changes include Renaissance Technologies LLC, Triple Frond Partners, ARK Invest, Sequoia Financial Advisors, and AKO Capital. Explore insights into buying and selling patterns, position changes, and investment conviction levels to understand institutional trading behavior and market dynamics.

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Portfolio quarterNameTypeQuantityRemainingReported stock balance
Q4 2023Sequoia Financial AdvisorsBuy3,3625,852$814,855
Q4 2023ValueAct HoldingsSell-191,565328,045$45,676,986
Q4 2023Polen Capital ManagementSell-5,092,70133,913$81,021,086
Q3 2023Sequoia Financial AdvisorsSell-1952,490$341,762
Q3 2023ValueAct HoldingsBuy519,610519,610$71,332,061
Q3 2023Polen Capital ManagementBuy29,1535,126,614$703,781,508
Q2 2023Sequoia Financial AdvisorsBuy6992,685$503,441
Q2 2023Parnassus Endeavor FundSell-66,00955,628$10,429,694
Q2 2023Polen Capital ManagementBuy14,9835,097,461$955,722,870
Q1 2023Icahn Capital ManagementBuy430,000430,000$99,997
Q1 2023Sequoia Financial AdvisorsBuy3421,986$461,845
Q1 2023Parnassus Endeavor FundBuy4,138121,637$28,286,684
Q1 2023Polen Capital ManagementBuy34,0765,082,478$1,181,930,308
Q4 2022Sequoia Financial AdvisorsBuy8411,644$332,417
Q4 2022Polen Capital ManagementBuy527,0055,048,402$1,020,786,888
Q3 2022Parnassus Endeavor FundBuy44,395117,499$22,418
Q3 2022Polen Capital ManagementBuy1,731,1694,521,397$862,637
Q2 2022Renaissance Technologies LLCSell-238,08160,237$11,105
Q2 2022Polen Capital ManagementBuy159,0572,790,228$514,406
Q1 2022Sequoia Financial AdvisorsBuy116803$281
Q1 2022Parnassus Endeavor FundSell-159,39373,104$25,543
Q1 2022Renaissance Technologies LLCSell-81,100298,318$104,232
Q1 2022Polen Capital ManagementSell-31,5312,631,171$919,331
Q4 2021Sequoia Financial AdvisorsBuy133687$261
Q4 2021Renaissance Technologies LLCSell-44,708379,418$144,346
Q4 2021Polen Capital ManagementBuy126,6232,662,702$1,012,998
Q3 2021Parnassus Endeavor FundSell-15,295232,497$94,303
Q3 2021Sequoia Financial AdvisorsSell-128554$225
Q3 2021Viking Global InvestorsSell-253,339155,319$62,999
Q3 2021Renaissance Technologies LLCBuy287,608424,126$172,030

Frequently asked questions about ILMN activity

  • Which institutional owners are buying ILMN?

    Institutional owners buying ILMN include investors who have either initiated new positions or increased their existing holdings based on recent SEC 13F filings. The activity table above highlights which funds added shares in the latest reporting periods and how their positions changed over time.

  • What does "buy" mean in ILMN activity?

    "Buy" means an investor increased their reported position in ILMN compared to the prior reporting period. This reflects growing exposure to ILLUMINA INC (ILMN) rather than necessarily a brand-new position (though new positions also appear as buys when prior quantity was zero).

  • Is institutional interest in ILMN increasing?

    Institutional interest in ILMN can be assessed by comparing the number of tracked funds adding or increasing positions versus those trimming or exiting across the periods shown. A higher number of additions typically signals increasing participation among large filers, but it should be read alongside position sizes and the full table.