CERUS CORP (CERS) Institutional Ownership Changes & 13F Activity

CERUS CORP (CERS) institutional ownership data tracks hedge funds, asset managers, and other institutional investors based on recent SEC 13F filings (Q1 2026). This page analyzes institutional buying and selling activity, new holdings, and sold-out positions among tracked filers. Notable filers include ARK Invest and Renaissance Technologies LLC.

Portfolio quarterNameTypeQuantityRemainingReported stock balance
Q2 2022ARK InvestBuy897,21517,111,062$84,700
Q2 2022Renaissance Technologies LLCSell-303,700192,800$1,020
Q1 2022ARK InvestBuy455,80316,213,847$89,014
Q1 2022Renaissance Technologies LLCSell-145,973496,500$2,726
Q4 2021ARK InvestSell-1,327,70015,758,044$107,312
Q4 2021Renaissance Technologies LLCBuy532,773642,473$4,375
Q3 2021ARK InvestSell-3,857,16717,085,744$104,052
Q3 2021Renaissance Technologies LLCSell-312,762109,700$668
Q2 2021ARK InvestSell-4,599,04420,942,911$123,773
Q2 2021Renaissance Technologies LLCBuy221,325422,462$2,497
Q1 2021ARK InvestSell-4,030,31025,541,955$153,507
Q1 2021Renaissance Technologies LLCSell-157,563201,137$1,209
Q4 2020ARK InvestSell-427,80629,572,265$204,640
Q4 2020Renaissance Technologies LLCBuy330,434358,700$2,482
Q3 2020ARK InvestBuy8,241,63630,000,071$187,800
Q2 2020ARK InvestBuy7,753,37921,758,435$143,606
Q1 2020ARK InvestBuy4,588,59614,005,056$65,124
Q4 2019ARK InvestBuy733,2909,416,460$39,737
Q4 2019Renaissance Technologies LLCSell-29,07528,266$119
Q3 2019ARK InvestBuy190,1488,683,170$44,762
Q2 2019ARK InvestBuy853,5898,493,022$47,731
Q2 2019Renaissance Technologies LLCSell-203,85957,341$322
Q1 2019ARK InvestBuy898,6517,639,433$47,594
Q1 2019Renaissance Technologies LLCBuy195,100261,200$1,627
Q4 2018ARK InvestBuy241,7506,740,782$34,176
Q3 2018ARK InvestBuy803,6616,499,032$46,858
Q3 2018Renaissance Technologies LLCSell-494,11466,100$477
Q2 2018ARK InvestBuy443,3875,695,371$37,988
Q1 2018ARK InvestBuy1,687,6115,251,984$28,781
Q4 2017ARK InvestBuy881,1713,564,373$12,048

Frequently asked questions about CERS activity

  • Which institutional owners are buying CERS?

    Institutional owners buying CERS 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 CERS activity?

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

  • Is institutional interest in CERS increasing?

    Institutional interest in CERS 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.

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