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
Q3 2021Polen Capital ManagementBuy55,3032,536,079$1,028,659
Q2 2021Parnassus Endeavor FundBuy1,797247,792$117,258
Q2 2021Sequoia Financial AdvisorsSell-44682$323
Q2 2021Polen Capital ManagementBuy103,7472,480,776$1,173,928
Q1 2021Parnassus Endeavor FundBuy47,596245,995$94,477
Q1 2021Sequoia Financial AdvisorsBuy31726$279
Q1 2021Renaissance Technologies LLCBuy118,600136,518$52,431
Q1 2021Polen Capital ManagementBuy48,7512,377,029$912,922
Q4 2020ARK InvestSell-928,07850,585$18,716
Q4 2020Sequoia Financial AdvisorsBuy29695$257
Q4 2020Polen Capital ManagementBuy1,765,5032,328,278$861,463
Q3 2020ARK InvestBuy50,126978,663$302,485
Q3 2020Parnassus Endeavor FundBuy121,612198,399$61,321
Q3 2020Sequoia Financial AdvisorsBuy666666$206
Q3 2020Renaissance Technologies LLCSell-117,20817,918$5,538
Q3 2020Polen Capital ManagementBuy562,775562,775$173,942
Q2 2020ARK InvestSell-75,489928,537$343,884
Q2 2020Parnassus Endeavor FundSell-19,33276,787$28,438
Q2 2020Renaissance Technologies LLCBuy134,226135,126$50,044
Q1 2020ARK InvestBuy276,2861,004,026$274,220
Q1 2020Parnassus Endeavor FundBuy31,52996,119$26,252
Q1 2020Renaissance Technologies LLCSell-192,218900$246
Q4 2019ARK InvestBuy32,430727,740$241,420
Q4 2019Parnassus Endeavor FundBuy12,62264,590$21,427
Q4 2019Viking Global InvestorsSell-1,518,298408,658$135,568
Q4 2019Lone Pine CapitalSell-1,155,350519,808$172,441
Q3 2019ARK InvestBuy157,779695,310$211,527
Q3 2019Parnassus Endeavor FundBuy51,96851,968$15,810
Q3 2019Viking Global InvestorsBuy555,8691,926,956$586,219
Q2 2019ARK InvestBuy70,578537,531$197,892

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.