(SRDX) Institutional Ownership Changes & 13F Activity

SRDX. Institutional ownership data tracks hedge funds, asset managers, and other institutional investors based on recent SEC Form 13F filings. This page analyzes institutional buying and selling activity, new holdings, and sold-out positions among tracked filers. Notable filers include Disciplined Growth Investors, Mairs & Power Growth Fund, and Renaissance Technologies LLC.

Portfolio quarterNameTypeQuantityRemainingReported stock balance
Q1 2019Renaissance Technologies LLCSell-42,5001,059,038$46,047
Q1 2019Disciplined Growth InvestorsBuy2,377174,360$7,581
Q4 2018Renaissance Technologies LLCBuy9,7001,101,538$52,059
Q4 2018Disciplined Growth InvestorsSell-1,783171,983$8,128
Q3 2018Renaissance Technologies LLCBuy93,4381,091,838$81,506
Q3 2018Mairs & Power Growth FundSell-7,0383,300$246
Q3 2018Disciplined Growth InvestorsSell-3,605173,766$12,972
Q2 2018Disciplined Growth InvestorsSell-367177,371$9,791
Q1 2018Renaissance Technologies LLCSell-25,138998,400$37,989
Q1 2018Disciplined Growth InvestorsSell-1,116177,738$6,763
Q4 2017Renaissance Technologies LLCSell-3,3001,023,538$28,659
Q4 2017Disciplined Growth InvestorsSell-2,201178,854$5,008
Q3 2017Renaissance Technologies LLCBuy22,5001,026,838$31,832
Q3 2017Disciplined Growth InvestorsSell-9,300181,055$5,613
Q2 2017Renaissance Technologies LLCBuy1,6171,004,338$28,272
Q2 2017Disciplined Growth InvestorsSell-147190,355$5,358
Q1 2017Renaissance Technologies LLCBuy38,6831,002,721$24,115
Q1 2017Disciplined Growth InvestorsSell-1,775190,502$4,582
Q4 2016Renaissance Technologies LLCBuy103,900964,038$24,487
Q4 2016Disciplined Growth InvestorsBuy15,700192,277$4,884
Q3 2016Renaissance Technologies LLCBuy9,600860,138$25,882
Q3 2016Disciplined Growth InvestorsSell-2,700176,577$5,313
Q3 2016Mairs & Power Growth FundSell-1,36210,338$311
Q2 2016Renaissance Technologies LLCBuy18,400850,538$19,971
Q2 2016Mairs & Power Growth FundSell-5,00011,700$275
Q2 2016Disciplined Growth InvestorsSell-2,075179,277$4,209
Q1 2016Renaissance Technologies LLCBuy77,200832,138$15,320
Q1 2016Mairs & Power Growth FundSell-4,12516,700$307
Q1 2016Disciplined Growth InvestorsBuy975181,352$3,339
Q4 2015Renaissance Technologies LLCBuy119,900754,938$15,303

Frequently asked questions about SRDX activity

  • Which institutional owners are buying SRDX?

    Institutional owners buying SRDX 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 SRDX activity?

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

  • Is institutional interest in SRDX increasing?

    Institutional interest in SRDX 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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