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Calix CALX

US equityMarket cap rank #2717
$34.34 −$0.47 (-1.35%)
Market closed · Oct 5, 10:20 pm ET · Last extended-hours $34.34 0.00%
Open$34.73
Prev close$34.81
Day range$34.29 – $35.12
Volume964.3K
Market cap$2.16B
P/E (TTM)45.2
Dividend yield–

Ownership & positioning

Who holds it, who is betting against it, and where the big money is moving

Institutional ownership96.8%-0.25 pts vs. prior quarter
Institutions holding348+0 vs. prior quarter
Insider trades (recent)28 buys / 20 sellsNet buying
Short interest8.86% of floatDays to cover 5.6 · as of 15 Sep 2026
Short-sale volume share21.3%5-day average of daily volume

Short-sale volume as % of daily volume

16%21%25%30%Sep '26Sep '26Oct '26

Large-order net flow, last 20 sessions

Net of large-order buying minus selling, in USD. Over this window: −$9.37M (4 inflow days, 16 outflow days).

The five largest holders on file together own 46.3% of shares outstanding.

Largest holders

  • BlackRock18.70%
  • Vanguard Portfolio Management, LLC8.87%
  • Carl Russo8.77%
  • AllianceBernstein5.16%
  • Vanguard Capital Management, LLC4.77%
  • State Street Global Advisors4.63%
  • Geode Capital Management, LLC2.35%
  • Westfield Capital Management Company, L.P.2.10%

By investor type

  • Mutual Fund78.40%
  • Hedge Fund11.71%
  • Individual/Insider9.48%
  • Private Company2.89%
  • Public Company2.06%
  • Government Pension Fund1.41%
  • Insurance Company0.20%
  • Family Office/Trust0.09%

Reported short interest has fallen from 9.11% to 8.86% of float over the last 6 biweekly reports (30 Jun 2026 to 15 Sep 2026).

Short interest, by report

Report dateShares short% of floatDays to cover
15 Sep 2026 5,580,340 8.9% 5.6
31 Aug 2026 4,660,464 7.4% 6.0
14 Aug 2026 3,960,312 6.3% 5.2
31 Jul 2026 4,993,489 7.9% 2.9
15 Jul 2026 5,717,005 9.0% 5.2
30 Jun 2026 5,809,290 9.1% 3.9

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