Calix, Inc. (CALX) Ownership
CALX ownership summary
as of October 18, 2026- Institutions
- 99.5% of shares outstanding
- Insiders
- 9.71% of shares outstanding
- Shares outstanding
- 63.0M
- Float
- 57.0M shares available to trade
- Short interest
- 11.86% 5.3M shares short
- Days to cover
- 4.81 short interest up 14.4% vs prior month
- Institutions 99.46%
- Insiders 9.71%
CALX top institutional holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | BlackRock Inc | 18.70% | 11.8M | $429.8M | +622,087 (+5.6%) | June 30, 2026 |
| 2 | Vanguard Portfolio Management, LLC | 8.88% | 5.6M | $204.0M | +54,294 (+1.0%) | June 30, 2026 |
| 3 | AllianceBernstein L.P. | 5.16% | 3.2M | $118.6M | −2,716 (−0.1%) | June 30, 2026 |
| 4 | State Street Corp | 4.63% | 2.9M | $106.4M | +313,227 (+12.0%) | June 30, 2026 |
| 5 | Vanguard Capital Management, LLC | 4.11% | 2.6M | $94.4M | −99,101 (−3.7%) | June 30, 2026 |
| 6 | Geode Capital Management, LLC | 2.35% | 1.5M | $54.1M | +45,889 (+3.2%) | June 30, 2026 |
| 7 | Westfield Capital Management Company, L.P. | 2.10% | 1.3M | $48.3M | −221,567 (−14.3%) | June 30, 2026 |
| 8 | Dimensional Fund Advisors, Inc. | 2.08% | 1.3M | $47.8M | +90,941 (+7.5%) | June 30, 2026 |
| 9 | Acadian Asset Management LLC | 1.97% | 1.2M | $45.3M | +441,292 (+55.1%) | June 30, 2026 |
| 10 | Citadel Advisors Llc | 1.92% | 1.2M | $44.1M | +780,566 (+182.3%) | June 30, 2026 |
| 11 | Paradigm Capital Management, Inc. | 1.58% | 997K | $36.4M | +228,934 (+29.8%) | June 30, 2026 |
| 12 | Fort Washington Investment Advisors Inc | 1.48% | 934K | $34.1M | +933,937 (0.0%) | September 30, 2026 |
| 13 | Arrowstreet Capital Limited Partnership | 1.39% | 876K | $32.0M | +324,687 (+58.9%) | June 30, 2026 |
| 14 | UBS Group AG | 1.36% | 857K | $31.3M | +212,115 (+32.9%) | June 30, 2026 |
| 15 | Loomis, Sayles & Company LP | 1.25% | 785K | $28.6M | −55,399 (−6.6%) | June 30, 2026 |
| 16 | MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. | 1.20% | 753K | $27.5M | +56,447 (+8.1%) | June 30, 2026 |
| 17 | Jane Street Group LLC | 1.14% | 719K | $26.2M | +366,823 (+104.2%) | June 30, 2026 |
| 18 | Two Sigma Investments LLC | 1.12% | 704K | $25.7M | +542,456 (+336.0%) | June 30, 2026 |
| 19 | Millennium Management LLC | 1.11% | 699K | $25.5M | −1.2M (−63.3%) | June 30, 2026 |
| 20 | Charles Schwab Investment Management Inc | 1.11% | 697K | $25.4M | +15,013 (+2.2%) | June 30, 2026 |
Value at the latest close. Change = shares bought or sold in the latest quarterly filing (13F). In the top 20, 15 holders added 5.0M shares and 5 cut 1.6M.
CALX top mutual fund and ETF holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | iShares Core S&P Small-Cap ETF | 5.42% | 3.4M | $124.5M | +846 (+0.0%) | September 30, 2026 |
| 2 | Vanguard MStar Total Stk Mkt Idx Invest | 2.89% | 1.8M | $66.5M | −2,743 (−0.2%) | August 31, 2026 |
| 3 | Vanguard Information Technology ETF | 2.40% | 1.5M | $55.2M | +3,474 (+0.2%) | September 30, 2026 |
| 4 | iShares Russell 2000 ETF | 2.39% | 1.5M | $55.0M | −17,344 (−1.1%) | September 30, 2026 |
| 5 | Vanguard Small Cap Index | 2.03% | 1.3M | $46.6M | −44,024 (−3.3%) | September 30, 2026 |
| 6 | Global X US Infrastructure Dev ETF | 1.95% | 1.2M | $44.8M | +8,640 (+0.7%) | September 30, 2026 |
| 7 | Harbor Small Cap Growth Instl | 1.48% | 933K | $34.1M | +284,600 (+43.9%) | September 30, 2026 |
| 8 | iShares Cybersecurity and Tech ETF | 1.39% | 876K | $32.0M | — | September 30, 2026 |
| 9 | Touchstone Small Company A | 1.14% | 716K | $26.1M | +716,270 (0.0%) | September 30, 2026 |
| 10 | Vanguard MStar Small Cap Growth Indx Inv | 1.13% | 710K | $25.9M | −49,570 (−6.5%) | September 30, 2026 |
| 11 | Fidelity Small Cap Index | 1.03% | 647K | $23.6M | +4,841 (+0.8%) | July 31, 2026 |
| 12 | Vanguard Strategic Equity Inv | 0.89% | 561K | $20.5M | +93,268 (+20.0%) | June 30, 2026 |
| 13 | iShares Russell 2000 Growth ETF | 0.87% | 548K | $20.0M | −693 (−0.1%) | September 30, 2026 |
| 14 | AB Discovery Value Advisor | 0.86% | 544K | $19.9M | −12,444 (−2.2%) | August 31, 2026 |
| 15 | iShares S&P Small-Cap 600 Growth ETF | 0.84% | 531K | $19.4M | — | September 30, 2026 |
| 16 | Nomura Small Cap Core I | 0.84% | 529K | $19.3M | — | August 31, 2026 |
| 17 | State Street SPDR Port S&P 600 Sm CpETF | 0.83% | 525K | $19.2M | — | September 30, 2026 |
| 18 | State Street® SPDR® S&P® Telecom ETF | 0.75% | 471K | $17.2M | +4,486 (+1.0%) | September 30, 2026 |
| 19 | Loomis Sayles Small Cap Growth Instl | 0.71% | 450K | $16.4M | +30,463 (+7.3%) | August 31, 2026 |
| 20 | iShares U.S. Digital Infras & RE ETF | 0.70% | 440K | $16.0M | — | September 30, 2026 |
Funds report holdings monthly or quarterly; dates differ by fund.
CALX insider transactions
latest 9| Date | Name | Transaction | Price | Shares | Value |
|---|---|---|---|---|---|
| 2025-11-06 | Cory Sindelar | Sell | $65.30 | 50,000 | $3.3M |
| 2025-11-04 | Carl Russo | Sell | $64.09 | 420,000 | $26.9M |
| 2025-11-04 | Shane Todd Marshall Eleniak | Sell | $65.34 | 50,000 | $3.3M |
| 2025-10-30 | Cory Sindelar | Sell | $65.00 | 10,000 | $650,000 |
| 2025-08-28 | Cory Sindelar | Sell | $60.00 | 10,000 | $600,000 |
| 2025-07-28 | Carl Russo | Sell | $55.40 | 25,000 | $1.4M |
| 2025-07-23 | Cory Sindelar | Sell | $56.00 | 10,000 | $560,000 |
| 2025-06-30 | Cory Sindelar | Sell | $52.00 | 10,000 | $520,000 |
| 2025-04-28 | Carl Russo | Sell | $39.59 | 25,000 | $989,750 |
Reported trades by company officers, directors and other filers (including disclosures by members of Congress where EODHD lists them). "—" where the filing gives no share count.
CALX shares outstanding
Year-end shares outstanding, adjusted for splits.
Who owns CALX
Institutional investors own 99.5% of Calix's shares and insiders 9.71%. The largest holder is BlackRock Inc with 18.70% of the shares (11.8M), as of June 30, 2026. Among the top 20 institutions, 15 added shares and 5 reduced their stake in the latest filings. Short interest is 11.86% of the float, or 4.81 days of average trading volume. The share count rose 37.3% since 2014.
Related: CALX analyst forecast, CALX key metrics. See the CALX stock overview for the latest quote and news.
CALX ownership FAQ
Who owns the most Calix stock?
The largest shareholders of Calix are BlackRock Inc (18.70%), Vanguard Portfolio Management, LLC (8.88%), AllianceBernstein L.P. (5.16%), State Street Corp (4.63%), Vanguard Capital Management, LLC (4.11%).
What percentage of Calix is owned by institutions?
Institutions hold 99.5% of Calix's shares outstanding; insiders hold 9.71%.
Which funds own Calix?
The largest fund holders of Calix are iShares Core S&P Small-Cap ETF (5.42%), Vanguard MStar Total Stk Mkt Idx Invest (2.89%), Vanguard Information Technology ETF (2.40%), iShares Russell 2000 ETF (2.39%), Vanguard Small Cap Index (2.03%).
What is Calix's short interest?
5.3M shares of Calix were sold short, 11.86% of the float; at the average daily volume it would take 4.81 days to cover.
Are insiders buying or selling Calix?
Of the latest 9 reported insider transactions in Calix (since April 28, 2025), 0 were purchases and 9 were sales.
How many shares of Calix are outstanding?
Calix has 63.0M shares outstanding, of which 57.0M are in the public float.