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Buy Day today: Neutral (51) Mixed market breadth · no major macro event
CALX

Calix Inc

Technology · Software - Infrastructure

35.20$ +0.3% vs. previous close Closing price · As of: Sep 18, 2026

Ownership

Ownership Structure

Who owns Calix Inc (CALX)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 90.5% of the shares are freely tradable; institutional investors hold 97.3%.

Institutional ownership ?Share of the stock held by institutional investors (funds, banks, insurers) according to regulatory filings. 97.3%
Insiders ?Share of the stock held by the executives, founders and major shareholders of the company itself. 9.6%
Float ?Share of stock freely tradable on the market — not locked up in the hands of founders, insiders, or major shareholders. 90.5%
Short % of float ?Shares sold short as a percentage of the freely tradable float — high values signal many bets on falling prices. 10.4%
Shares Outstanding ?Total number of shares issued. Price times share count gives market cap. 63Mio.

Largest Shareholders

Institutions

Institutions CALX
Name Stake (%) Shares Change (%) Date
BlackRock Inc 17.71 11,153,403 -2.7 03/31/2026
Vanguard Portfolio Management, LLC 8.79 5,533,754 +0.0 03/31/2026
AllianceBernstein L.P. 5.16 3,251,128 +122.3 03/31/2026
Vanguard Capital Management, LLC 4.27 2,686,525 +0.0 03/31/2026
State Street Corp 4.13 2,602,333 +10.1 03/31/2026
Geode Capital Management, LLC 2.28 1,435,706 -0.7 03/31/2026

Funds

Funds CALX
Name Stake (%) Shares Change (%) Date
iShares Core S&P Small-Cap ETF 5.61 3,533,632 -0.2 08/31/2026
Vanguard MStar Total Stk Mkt Idx Invest 2.90 1,823,738 +0.4 07/31/2026
Vanguard Information Technology ETF 2.41 1,518,217 +0.4 07/31/2026
iShares Russell 2000 ETF 2.40 1,514,009 -0.6 08/31/2026

Largest reported positions according to regulatory filings; stake as a percentage of shares outstanding, change versus the previous filing. Source: fundamentals data.

Insider holdings

Insider holdings CALX
Person Role Shares Value As of Type
Russo Carl Director 1,569,188 55,235,418 $ Jul 27, 2026 indirect

Holdings as of each person's most recent SEC Form 4 filing — excluding options and RSUs, which are not shares yet. Holdings may have changed between two filings.

Insiders

Insider Transactions

Insider Transactions
Date Person Role Type Shares Price Value
Jul 27, 2026 Russo Carl Director Sell 75,000 36.20 2,714,805

Reportable transactions by officers and major shareholders from SEC Form 4 filings. "Other" includes things like stock grants and option exercises without a buy/sell character. View all insider transactions →

Data as of: September 18, 2026 · Source: fundamental data & SEC filings (annual and quarterly reports, 10-K/10-Q)

Note: pure fact-based analysis, not investment advice and not a solicitation to buy or sell. All figures without guarantee.

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