Who owns Cambium Networks Corporation (CMBM)
Which tracked institutional funds hold CMBM, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See CMBM company fundamentals →
Ownership as of the 2025-Q4 13F filings (latest filed 2026-02-23). 13F is disclosed up to 45 days after quarter-end, so the most recent quarter fills in over the following weeks.
How the tape is positioned
The tracked-fund tape on CMBM is one-sided between 2025-Q4 and 2026-Q1: 0 added or opened and 1 trimmed or exited — on balance reducing.
A prompt to read the filings, not a verdict. 13F is a quarter-end snapshot disclosed up to 45 days late; a fund adds or exits for mandate, benchmark, and timing reasons that have nothing to do with a view on the stock. This is a starting question, not a signal to trade.
Conviction spread
CMBM’s largest tracked holder by dollar value, Vector Capital Management, L.P., sizes it at 52.6% of its own reported 13F book, while the median holder sizes it at 0.0% of theirs — a 52.6pp conviction gap — its largest holder concentrates the name more heavily than the typical one.
Book-share is each fund’s reported value in CMBM divided by its whole reported 13F book, so it is comparable across funds of different sizes and is unaffected by stock splits. A higher share means a fund has committed more of its book to the name — a starting question about conviction, not a verdict or a signal to trade.
Institutional & insider positioning
Between 2025-Q3 and 2025-Q4, across 29 tracked filers holding CMBM, 10 increased or opened the position and 18 reduced or closed it; over the same quarter, there were no open-market insider Form 4s.
This fuses two public signals for the same quarter — how tracked institutions changed their positions and whether insiders bought or sold in the open market. It describes what was filed; it is a starting question, not a verdict or a signal to trade.
New buyers & exits
Funds opening or closing a position in CMBM between the 2025-Q4 and 2026-Q1 13F filings, and the largest changes among funds holding it in both. New buyers and exits are counted on fund presence (split-invariant); adds and trims are measured on reported value.
Full exits 1
- RENAISSANCE TECHNOLOGIES LLC$555K
Institutional holders
One row per tracked fund, largest reported value first. “% of value” is the fund’s share of this security’s tracked institutional value — not of shares outstanding. Rows marked stale are from an earlier filing than the security’s latest quarter — that fund is absent from the newest snapshot (position exited, or reported under a different name).
| Fund | Shares | Reported value | % of value | Quarter |
|---|---|---|---|---|
| RENAISSANCE TECHNOLOGIES LLC trimmed | 385,749 | $555K | 3.1% | 2025-Q4 |
| VANGUARD GROUP INC added | 218,960 | $315K | 1.7% | 2025-Q4 |
| BlackRock, Inc. trimmed | 142,861 | $206K | 1.1% | 2025-Q4 |
| JANE STREET GROUP, LLC added | 130,745 | $188K | 1.0% | 2025-Q4 |
| GEODE CAPITAL MANAGEMENT, LLC added | 129,734 | $187K | 1.0% | 2025-Q4 |
| RBF Capital, LLC trimmed | 121,652 | $175K | 1.0% | 2025-Q4 |
| GSA CAPITAL PARTNERS LLP trimmed | 118,546 | $171K | 0.9% | 2025-Q4 |
| TWO SIGMA INVESTMENTS, LP trimmed | 92,461 | $133K | 0.7% | 2025-Q4 |
| STATE STREET CORP added | 60,390 | $87K | 0.5% | 2025-Q4 |
| Friday Financial | 53,186 | $77K | 0.4% | 2025-Q4 |
| Focus Partners Advisor Solutions, LLC | 53,186 | $77K | 0.4% | 2025-Q4 |
| DEUTSCHE BANK AG\ | 38,809 | $56K | 0.3% | 2025-Q4 |
| Virtu Financial LLC added | 38,463 | $55K | 0.3% | 2025-Q4 |
| XTX Topco Ltd added | 32,810 | $47K | 0.3% | 2025-Q4 |
| NORTHERN TRUST CORP added | 26,280 | $38K | 0.2% | 2025-Q4 |
| UBS Group AG added | 15,960 | $23K | 0.1% | 2025-Q4 |
| TUDOR INVESTMENT CORP ET AL | 21,307 | $19K | 0.1% | 2025-Q4 |
| Scientech Research LLC new | 12,109 | $17K | 0.1% | 2025-Q4 |
| BLAIR WILLIAM & CO/IL | 10,000 | $14K | 0.1% | 2025-Q4 |
| Tower Research Capital LLC (TRC) trimmed | 2,199 | $3K | 0.0% | 2025-Q4 |
| OSAIC HOLDINGS, INC. | 1,500 | $2K | 0.0% | 2025-Q4 |
| THOMPSON DAVIS & CO., INC. trimmed | 13,500 | $2K | 0.0% | 2026-Q1 |
| Cygnus Capital Advisors, LLC new | 15,771 | $2K | 0.0% | 2026-Q1 |
| JPMORGAN CHASE & CO | 537 | $774 | 0.0% | 2025-Q4 |
| BNP PARIBAS FINANCIAL MARKETS | 519 | $747 | 0.0% | 2025-Q4 |
| BANK OF AMERICA CORP /DE/ trimmed | 451 | $649 | 0.0% | 2025-Q4 |
| SBI Securities Co., Ltd. trimmed | 22 | $32 | 0.0% | 2025-Q4 |
| CITIGROUP INC trimmed | 1 | $1 | 0.0% | 2025-Q4 |
| HUNTINGTON NATIONAL BANK | 1 | — | 0.0% | 2026-Q1 |
| ACADIAN ASSET MANAGEMENT LLC | 26 | — | 0.0% | 2026-Q1 |
| Vector Capital Management, L.P. | 14,325,696 | $13M | 70.5% | 2025-Q3 stale |
| Topline Capital Management, LLC trimmed | 1,411,420 | $996K | 5.5% | 2025-Q1 stale |
| AMH Equity Ltd trimmed | 800,000 | $715K | 3.9% | 2025-Q3 stale |
| PARADIGM CAPITAL MANAGEMENT INC/NY | 466,900 | $418K | 2.3% | 2025-Q3 stale |
| TWO SIGMA ADVISERS, LP added | 444,200 | $397K | 2.2% | 2025-Q3 stale |
| BOOTHBAY FUND MANAGEMENT, LLC trimmed | 101,233 | $71K | 0.4% | 2025-Q1 stale |
| FEDERATED HERMES, INC. added | 75,000 | $53K | 0.3% | 2025-Q1 stale |
| HRT FINANCIAL LP added | 125,938 | $51K | 0.3% | 2025-Q2 stale |
| Squarepoint Ops LLC trimmed | 70,476 | $50K | 0.3% | 2025-Q1 stale |
| BARCLAYS PLC added | 26,264 | $48K | 0.3% | 2025-Q3 stale |
| LANDSCAPE CAPITAL MANAGEMENT, L.L.C. trimmed | 76,502 | $31K | 0.2% | 2025-Q2 stale |
| DIMENSIONAL FUND ADVISORS LP trimmed | 40,695 | $29K | 0.2% | 2025-Q1 stale |
| CITADEL ADVISORS LLC trimmed | 26,989 | $24K | 0.1% | 2025-Q3 stale |
| TWO SIGMA SECURITIES, LLC trimmed | 12,253 | $11K | 0.1% | 2025-Q3 stale |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP trimmed | 12,590 | $9K | 0.0% | 2025-Q1 stale |
| Engineers Gate Manager LP trimmed | 10,642 | $8K | 0.0% | 2025-Q1 stale |
| GOLDMAN SACHS GROUP INC trimmed | 14,620 | $6K | 0.0% | 2025-Q2 stale |
| JONES FINANCIAL COMPANIES LLLP new | 3,000 | $1K | 0.0% | 2025-Q2 stale |
| MORGAN STANLEY trimmed | 1,188 | $1K | 0.0% | 2025-Q3 stale |
| COLDSTREAM CAPITAL MANAGEMENT INC new | 1,064 | $751 | 0.0% | 2025-Q1 stale |
| GROUP ONE TRADING LLC | 1,000 | $405 | 0.0% | 2025-Q2 stale |
| RAYMOND JAMES FINANCIAL INC new | 90 | $36 | 0.0% | 2025-Q2 stale |
| SIMPLEX TRADING, LLC trimmed | 967 | — | 0.0% | 2025-Q3 stale |
| CONCOURSE FINANCIAL GROUP SECURITIES, INC. | 0 | — | 0.0% | 2025-Q2 stale |
Ownership over time
Tracked institutional holder count and total shares held by filing quarter (independent scales). The curated-era tail and any mid-ingest latest quarter are handled honestly — a partial quarter is not drawn as a collapse.
Reading this table
Funds hold the same stock for different reasons — an index fund “holds” almost everything, an active manager sizes a name to a mandate and a benchmark, and each fund entered at its own price and time. Because 13F is filed up to 45 days after quarter-end, every row is a backward-looking snapshot; a manager may have traded since. Share-class siblings (a company’s A and C shares) are rolled up to one line so a dual-class name is never double-counted. Compare like-for-like. A large holder is not an endorsement, and a fund exiting is not a warning — this is a starting question, not a verdict.
About 13F filings
A Form 13F is a quarterly disclosure that institutional investment managers with over $100 million in US-listed equities must file with the SEC. In plain English: it is a snapshot of the long stock positions a fund held at the end of a quarter. It covers long US-listed equities only — not short positions, options, cash, or private holdings — and the funds shown are the large sample we track, not the complete 13F universe.