Who owns RDCM
Which tracked institutional funds hold RDCM, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See RDCM company fundamentals →
Ownership as of the 2026-Q1 13F filings (latest filed 2026-05-18). 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 RDCM is one-sided between 2025-Q4 and 2026-Q1: 2 added or opened and 13 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
RDCM’s largest tracked holder by dollar value, Lynrock Lake LP, sizes it at 6.6% of its own reported 13F book, while the median holder sizes it at 0.0% of theirs — a 6.6pp conviction gap — its largest holder concentrates the name more heavily than the typical one.
Book-share is each fund’s reported value in RDCM 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-Q4 and 2026-Q1, across 44 tracked filers holding RDCM, 17 increased or opened the position and 27 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 RDCM 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 2
- ESSEX INVESTMENT MANAGEMENT CO LLC$3M
- Legato Capital Management LLC$966K
Largest adds
- Lynrock Lake LP$7M
- ACADIAN ASSET MANAGEMENT LLC$568K
Largest trims
- MARSHALL WACE, LLP$937K
- AWM Investment Company, Inc.$912K
- TWO SIGMA INVESTMENTS, LP$908K
- Value Base Ltd.$796K
- CITADEL ADVISORS LLC$607K
- Yelin Lapidot Holdings Management Ltd.$532K
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 |
|---|---|---|---|---|
| Lynrock Lake LP added | 3,166,666 | $39M | 33.0% | 2026-Q1 |
| AWM Investment Company, Inc. | 991,261 | $12M | 10.3% | 2026-Q1 |
| Value Base Ltd. | 865,009 | $11M | 9.0% | 2026-Q1 |
| ACADIAN ASSET MANAGEMENT LLC added | 628,129 | $8M | 6.5% | 2026-Q1 |
| Yelin Lapidot Holdings Management Ltd. trimmed | 404,595 | $5M | 4.2% | 2026-Q1 |
| Private Advisor Group, LLC added | 351,019 | $4M | 3.7% | 2026-Q1 |
| Janney Montgomery Scott LLC added | 327,479 | $4M | 3.4% | 2026-Q1 |
| HERALD INVESTMENT MANAGEMENT Ltd | 325,000 | $4M | 3.4% | 2026-Q1 |
| RENAISSANCE TECHNOLOGIES LLC trimmed | 193,793 | $2M | 2.0% | 2026-Q1 |
| ARK Investment Management LLC added | 172,735 | $2M | 1.8% | 2026-Q1 |
| Russell Investments Group, Ltd. trimmed | 168,362 | $2M | 1.8% | 2026-Q1 |
| MARSHALL WACE, LLP trimmed | 133,297 | $2M | 1.4% | 2026-Q1 |
| NANO CAP NEW MILLENNIUM GROWTH FUND L P | 102,000 | $1M | 1.1% | 2026-Q1 |
| BlackRock, Inc. added | 91,033 | $1M | 0.9% | 2026-Q1 |
| Squarepoint Ops LLC added | 78,851 | $959K | 0.8% | 2026-Q1 |
| MILLENNIUM MANAGEMENT LLC trimmed | 66,216 | $805K | 0.7% | 2026-Q1 |
| Trexquant Investment LP added | 59,216 | $720K | 0.6% | 2026-Q1 |
| SEI INVESTMENTS CO trimmed | 32,066 | $390K | 0.3% | 2026-Q1 |
| TWO SIGMA INVESTMENTS, LP trimmed | 29,675 | $361K | 0.3% | 2026-Q1 |
| Qube Research & Technologies Ltd new | 28,103 | $342K | 0.3% | 2026-Q1 |
| Boston Partners trimmed | 24,722 | $301K | 0.3% | 2026-Q1 |
| MORGAN STANLEY trimmed | 21,465 | $261K | 0.2% | 2026-Q1 |
| State of Tennessee, Department of Treasury | 20,909 | $254K | 0.2% | 2026-Q1 |
| LAZARD ASSET MANAGEMENT LLC added | 19,378 | $236K | 0.2% | 2026-Q1 |
| Walleye Capital LLC trimmed | 18,887 | $230K | 0.2% | 2026-Q1 |
| UBS Group AG trimmed | 18,389 | $224K | 0.2% | 2026-Q1 |
| PRUDENTIAL FINANCIAL INC | 18,000 | $219K | 0.2% | 2026-Q1 |
| VIRTUS ADVISERS, LLC | 15,356 | $187K | 0.2% | 2026-Q1 |
| Point72 Asset Management, L.P. added | 14,813 | $180K | 0.2% | 2026-Q1 |
| Man Group plc new | 14,496 | $176K | 0.2% | 2026-Q1 |
| GEODE CAPITAL MANAGEMENT, LLC | 13,724 | $167K | 0.1% | 2026-Q1 |
| BANK OF AMERICA CORP /DE/ trimmed | 12,364 | $150K | 0.1% | 2026-Q1 |
| NORTHERN TRUST CORP trimmed | 12,279 | $149K | 0.1% | 2026-Q1 |
| CITADEL ADVISORS LLC trimmed | 10,782 | $131K | 0.1% | 2026-Q1 |
| Cox Capital Mgt LLC | 10,000 | $122K | 0.1% | 2026-Q1 |
| NEW YORK STATE COMMON RETIREMENT FUND | 5,255 | $64K | 0.1% | 2026-Q1 |
| JPMORGAN CHASE & CO added | 3,603 | $43K | 0.0% | 2026-Q1 |
| JONES FINANCIAL COMPANIES LLLP added | 2,550 | $31K | 0.0% | 2026-Q1 |
| PUBLIC EMPLOYEES RETIREMENT SYSTEM OF OHIO | 2,481 | $30K | 0.0% | 2026-Q1 |
| OSAIC HOLDINGS, INC. added | 1,080 | $13K | 0.0% | 2026-Q1 |
| Tower Research Capital LLC (TRC) trimmed | 267 | $3K | 0.0% | 2026-Q1 |
| WELLS FARGO & COMPANY/MN trimmed | 100 | $1K | 0.0% | 2026-Q1 |
| ROYAL BANK OF CANADA trimmed | 84 | $1K | 0.0% | 2026-Q1 |
| SBI Securities Co., Ltd. | 20 | $243 | 0.0% | 2026-Q1 |
| Inflection Point Investments LLP trimmed | 314,991 | $5M | 3.9% | 2025-Q3 stale |
| ESSEX INVESTMENT MANAGEMENT CO LLC trimmed | 228,305 | $3M | 2.6% | 2025-Q4 stale |
| P.A.W. CAPITAL CORP trimmed | 128,320 | $2M | 1.5% | 2025-Q2 stale |
| Legato Capital Management LLC added | 73,866 | $966K | 0.8% | 2025-Q4 stale |
| Acuitas Investments, LLC trimmed | 37,962 | $497K | 0.4% | 2025-Q4 stale |
| JANE STREET GROUP, LLC added | 27,918 | $365K | 0.3% | 2025-Q4 stale |
| GOLDMAN SACHS GROUP INC added | 24,026 | $314K | 0.3% | 2025-Q4 stale |
| Diametric Capital, LP trimmed | 17,123 | $248K | 0.2% | 2025-Q3 stale |
| Quadrature Capital Ltd added | 16,354 | $237K | 0.2% | 2025-Q3 stale |
| Worth Venture Partners, LLC trimmed | 17,365 | $227K | 0.2% | 2025-Q4 stale |
| Corton Capital Inc. new | 15,484 | $210K | 0.2% | 2025-Q2 stale |
| XTX Topco Ltd new | 14,988 | $196K | 0.2% | 2025-Q4 stale |
| Cubist Systematic Strategies, LLC new | 13,211 | $191K | 0.2% | 2025-Q3 stale |
| TWO SIGMA ADVISERS, LP added | 14,600 | $191K | 0.2% | 2025-Q4 stale |
| BOOTHBAY FUND MANAGEMENT, LLC trimmed | 12,998 | $170K | 0.1% | 2025-Q4 stale |
| GSA CAPITAL PARTNERS LLP | 11,605 | $152K | 0.1% | 2025-Q4 stale |
| PRELUDE CAPITAL MANAGEMENT, LLC added | 12,109 | $138K | 0.1% | 2025-Q1 stale |
| Jump Financial, LLC trimmed | 10,577 | $138K | 0.1% | 2025-Q4 stale |
| Federation des caisses Desjardins du Quebec | 5,508 | $63K | 0.1% | 2025-Q1 stale |
| RAYMOND JAMES FINANCIAL INC new | 2,500 | $34K | 0.0% | 2025-Q2 stale |
| NATIONAL BANK OF CANADA /FI/ new | 2,500 | $34K | 0.0% | 2025-Q2 stale |
| CITIGROUP INC new | 1 | $13 | 0.0% | 2025-Q4 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.