IDEX CORP (IEX) Stock Institutional Trading Activity


IDEX CORP (IEX) position changes reported by tracked institutional filers across multiple SEC 13F reporting periods. Based on recent SEC 13F filings (Q3 2025), investors with some of the largest reported share count changes include Dodge & Cox Stock Fund, Renaissance Technologies LLC, Sequoia Financial Advisors, Fundsmith, and Mairs & Power Growth Fund. 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 2019Renaissance Technologies LLCSell-1,13091,095$14,929
Q2 2019Renaissance Technologies LLCBuy16,70092,225$15,876
Q3 2018Renaissance Technologies LLCBuy22,80075,525$11,379
Q1 2018Ariel Appreciation FundSell-17,12658,816$8,382
Q1 2018Renaissance Technologies LLCBuy49,92552,725$7,514
Q4 2017Ariel Appreciation FundSell-74,62575,942$10,022
Q4 2017Renaissance Technologies LLCSell-74,2252,800$370
Q3 2017Ariel Appreciation FundSell-14,026150,567$18,289
Q3 2017Renaissance Technologies LLCSell-40,30077,025$9,356
Q2 2017Ariel Appreciation FundSell-31,559164,593$18,601
Q2 2017Renaissance Technologies LLCSell-55,100117,325$13,259
Q1 2017Ariel Appreciation FundSell-16,832196,152$18,342
Q1 2017Renaissance Technologies LLCBuy82,300172,425$16,123
Q4 2016Ariel Appreciation FundSell-42,684212,984$19,181
Q4 2016Renaissance Technologies LLCBuy40,90090,125$8,117
Q3 2016Ariel Appreciation FundSell-13,506255,668$23,923
Q3 2016Renaissance Technologies LLCSell-38,00049,225$4,606
Q2 2016Ariel Appreciation FundSell-70,638269,174$22,099
Q2 2016Renaissance Technologies LLCBuy31,60087,225$7,161
Q1 2016Ariel Appreciation FundBuy12,860339,812$28,164
Q1 2016Renaissance Technologies LLCBuy6,60055,625$4,610
Q4 2015Ariel Appreciation FundBuy2,632326,952$25,048
Q3 2015Ariel Appreciation FundSell-91,961324,320$23,124
Q2 2015Ariel Appreciation FundSell-10,965416,281$32,711
Q1 2015Ariel Appreciation FundSell-1,975427,246$32,398
Q1 2015Renaissance Technologies LLCSell-39,70049,025$3,718
Q4 2014Mairs & Power Growth FundSell-584,072$317
Q4 2014Ariel Appreciation FundSell-125,080429,221$33,411
Q3 2014Mairs & Power Growth FundBuy584,130$299
Q3 2014Ariel Appreciation FundSell-1,235554,301$40,115

Frequently asked questions about IEX activity

  • Which institutional owners are buying IEX?

    Institutional owners buying IEX 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 IEX activity?

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

  • Is institutional interest in IEX increasing?

    Institutional interest in IEX 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.