INSPIRE MEDICAL SYSTEMS INC (INSP) Institutional Ownership Changes & 13F Activity

INSPIRE MEDICAL SYSTEMS INC (INSP) 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 Renaissance Technologies LLC, Mairs & Power Growth Fund, and Viking Global Investors.

Portfolio quarterNameTypeQuantityRemainingReported stock balance
Q1 2026Renaissance Technologies LLCBuy59,200469,968$24,240,949
Q4 2025Renaissance Technologies LLCBuy255,768410,768$37,885,133
Q4 2025Mairs & Power Growth FundSell-7,83057,616$5,313,924
Q3 2025Renaissance Technologies LLCBuy28,200155,000$11,501,000
Q3 2025Mairs & Power Growth FundSell-2,35865,446$4,856,093
Q2 2025Renaissance Technologies LLCSell-63,900126,800$16,454,836
Q2 2025Mairs & Power Growth FundSell-2,97267,804$8,798,925
Q1 2025Renaissance Technologies LLCBuy54,000190,700$30,374,696
Q1 2025Mairs & Power Growth FundBuy6,10570,776$11,273,201
Q4 2024Renaissance Technologies LLCBuy36,200136,700$25,341,446
Q4 2024Mairs & Power Growth FundBuy3,49864,671$11,988,710
Q3 2024Renaissance Technologies LLCBuy26,900100,500$21,210,525
Q3 2024Mairs & Power Growth FundSell-2,66061,173$12,910,562
Q2 2024Renaissance Technologies LLCSell-36,00073,600$9,849,888
Q2 2024Mairs & Power Growth FundBuy4,64563,833$8,542,770
Q1 2024Mairs & Power Growth FundSell-5,42159,188$12,712,991
Q1 2024Renaissance Technologies LLCSell-4,000109,600$23,541
Q4 2023Renaissance Technologies LLCSell-201,800113,600$23,110
Q4 2023Mairs & Power Growth FundBuy2,09864,609$13,143,409
Q3 2023Renaissance Technologies LLCBuy58,300315,400$62,588
Q3 2023Mairs & Power Growth FundBuy9,89662,511$12,404,683
Q2 2023Mairs & Power Growth FundSell-54,69852,615$17,080,934
Q2 2023Renaissance Technologies LLCBuy46,100257,100$83,465
Q1 2023Viking Global InvestorsSell-203,217346,576$81,123,044
Q1 2023Renaissance Technologies LLCBuy170,200211,000$49,389
Q1 2023Mairs & Power Growth FundSell-18,326107,313$25,118,754
Q4 2022Viking Global InvestorsSell-83,779549,793$138,481,861
Q4 2022Renaissance Technologies LLCBuy24,30040,800$10,277
Q4 2022Mairs & Power Growth FundSell-6,368125,639$31,645,951
Q3 2022Viking Global InvestorsBuy38,379633,572$112,377

Frequently asked questions about INSP activity

  • Which institutional owners are buying INSP?

    Institutional owners buying INSP 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 INSP activity?

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

  • Is institutional interest in INSP increasing?

    Institutional interest in INSP 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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