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-Q2 13F filings (latest filed 2026-08-17). 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
13 tracked funds added or opened RDCM while 5 trimmed or exited it between 2026-Q1 and 2026-Q2 — the tape is split. When large holders disagree on a name, the funds moving first are sometimes ahead of the story.
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 5.8% of its own reported 13F book, while the median holder sizes it at 0.0% of theirs — a 5.8pp 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 2026-Q1 and 2026-Q2, across 51 tracked filers holding RDCM, 26 increased or opened the position and 21 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 2026-Q1 and 2026-Q2 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.
New buyers 3
- QVT Financial LP$6M
- RAYMOND JAMES FINANCIAL INC$1M
- Robertson Stephens Wealth Management, LLC$512K
Full exits 2
- ACADIAN ASSET MANAGEMENT LLC$8M
- Janney Montgomery Scott LLC$4M
Largest adds
- Value Base Ltd.$2M
- RENAISSANCE TECHNOLOGIES LLC$2M
- AWM Investment Company, Inc.$1M
- Yelin Lapidot Holdings Management Ltd.$785K
- Qube Research & Technologies Ltd$747K
- Private Advisor Group, LLC$673K
Largest trims
- Lynrock Lake LP$2M
- MARSHALL WACE, LLP$915K
- Squarepoint Ops LLC$509K
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 trimmed | 2,608,752 | $37M | 27.8% | 2026-Q2 |
| AWM Investment Company, Inc. trimmed | 951,796 | $13M | 10.1% | 2026-Q2 |
| Value Base Ltd. | 865,009 | $12M | 9.2% | 2026-Q2 |
| QVT Financial LP new | 445,265 | $6M | 4.7% | 2026-Q2 |
| Yelin Lapidot Holdings Management Ltd. | 404,595 | $6M | 4.3% | 2026-Q2 |
| Private Advisor Group, LLC trimmed | 350,471 | $5M | 3.7% | 2026-Q2 |
| HERALD INVESTMENT MANAGEMENT Ltd | 325,000 | $5M | 3.5% | 2026-Q2 |
| RENAISSANCE TECHNOLOGIES LLC added | 276,298 | $4M | 2.9% | 2026-Q2 |
| ARK Investment Management LLC added | 174,214 | $2M | 1.9% | 2026-Q2 |
| Russell Investments Group, Ltd. trimmed | 148,289 | $2M | 1.6% | 2026-Q2 |
| NANO CAP NEW MILLENNIUM GROWTH FUND L P trimmed | 100,000 | $1M | 1.1% | 2026-Q2 |
| RAYMOND JAMES FINANCIAL INC added | 96,805 | $1M | 1.0% | 2026-Q2 |
| BlackRock, Inc. added | 91,716 | $1M | 1.0% | 2026-Q2 |
| Qube Research & Technologies Ltd added | 77,207 | $1M | 0.8% | 2026-Q2 |
| MILLENNIUM MANAGEMENT LLC trimmed | 65,870 | $929K | 0.7% | 2026-Q2 |
| Point72 Asset Management, L.P. added | 51,343 | $724K | 0.5% | 2026-Q2 |
| MARSHALL WACE, LLP trimmed | 50,029 | $705K | 0.5% | 2026-Q2 |
| CITADEL ADVISORS LLC added | 46,097 | $650K | 0.5% | 2026-Q2 |
| Trexquant Investment LP trimmed | 39,328 | $555K | 0.4% | 2026-Q2 |
| Robertson Stephens Wealth Management, LLC new | 36,284 | $512K | 0.4% | 2026-Q2 |
| SEI INVESTMENTS CO added | 35,823 | $505K | 0.4% | 2026-Q2 |
| XTX Topco Ltd added | 32,951 | $465K | 0.4% | 2026-Q2 |
| Squarepoint Ops LLC trimmed | 31,928 | $450K | 0.3% | 2026-Q2 |
| ARS Investment Partners, LLC new | 30,478 | $430K | 0.3% | 2026-Q2 |
| NewEdge Advisors, LLC new | 26,299 | $371K | 0.3% | 2026-Q2 |
| UBS Group AG added | 25,603 | $361K | 0.3% | 2026-Q2 |
| LAZARD ASSET MANAGEMENT LLC added | 22,465 | $317K | 0.2% | 2026-Q2 |
| Boston Partners trimmed | 21,949 | $309K | 0.2% | 2026-Q2 |
| MORGAN STANLEY trimmed | 20,931 | $295K | 0.2% | 2026-Q2 |
| GOLDMAN SACHS GROUP INC trimmed | 19,459 | $274K | 0.2% | 2026-Q2 |
| Brevan Howard Capital Management LP new | 19,342 | $273K | 0.2% | 2026-Q2 |
| PRUDENTIAL FINANCIAL INC | 18,000 | $254K | 0.2% | 2026-Q2 |
| Man Group plc added | 17,500 | $247K | 0.2% | 2026-Q2 |
| VIRTUS ADVISERS, LLC added | 17,446 | $246K | 0.2% | 2026-Q2 |
| TWO SIGMA INVESTMENTS, LP trimmed | 14,588 | $206K | 0.2% | 2026-Q2 |
| GEODE CAPITAL MANAGEMENT, LLC | 13,724 | $194K | 0.1% | 2026-Q2 |
| BANK OF AMERICA CORP /DE/ added | 13,154 | $185K | 0.1% | 2026-Q2 |
| Eurizon Capital SGR S.p.A. new | 10,990 | $153K | 0.1% | 2026-Q2 |
| Cox Capital Mgt LLC | 10,000 | $141K | 0.1% | 2026-Q2 |
| Crewe Advisors LLC new | 7,000 | $99K | 0.1% | 2026-Q2 |
| NEW YORK STATE COMMON RETIREMENT FUND | 5,255 | $74K | 0.1% | 2026-Q2 |
| State of Tennessee, Department of Treasury trimmed | 5,009 | $71K | 0.1% | 2026-Q2 |
| PUBLIC EMPLOYEES RETIREMENT SYSTEM OF OHIO | 2,481 | $35K | 0.0% | 2026-Q2 |
| Tower Research Capital LLC (TRC) added | 827 | $12K | 0.0% | 2026-Q2 |
| Steward Partners Investment Advisory, LLC new | 580 | $8K | 0.0% | 2026-Q2 |
| JONES FINANCIAL COMPANIES LLLP trimmed | 550 | $7K | 0.0% | 2026-Q2 |
| OSAIC HOLDINGS, INC. trimmed | 275 | $4K | 0.0% | 2026-Q2 |
| WELLS FARGO & COMPANY/MN | 100 | $1K | 0.0% | 2026-Q2 |
| Caitong International Asset Management Co., Ltd new | 27 | $381 | 0.0% | 2026-Q2 |
| SBI Securities Co., Ltd. added | 21 | $296 | 0.0% | 2026-Q2 |
| ROYAL BANK OF CANADA trimmed | 18 | — | 0.0% | 2026-Q2 |
| ACADIAN ASSET MANAGEMENT LLC added | 628,129 | $8M | 5.7% | 2026-Q1 stale (1 quarter behind) |
| Janney Montgomery Scott LLC added | 327,479 | $4M | 3.0% | 2026-Q1 stale (1 quarter behind) |
| Walleye Capital LLC trimmed | 18,887 | $230K | 0.2% | 2026-Q1 stale (1 quarter behind) |
| NORTHERN TRUST CORP trimmed | 12,279 | $149K | 0.1% | 2026-Q1 stale (1 quarter behind) |
| JPMORGAN CHASE & CO added | 3,603 | $43K | 0.0% | 2026-Q1 stale (1 quarter behind) |
| ESSEX INVESTMENT MANAGEMENT CO LLC trimmed | 228,305 | $3M | 2.3% | 2025-Q4 stale (2 quarters behind) |
| Legato Capital Management LLC added | 73,866 | $966K | 0.7% | 2025-Q4 stale (2 quarters behind) |
| Acuitas Investments, LLC trimmed | 37,962 | $497K | 0.4% | 2025-Q4 stale (2 quarters behind) |
| JANE STREET GROUP, LLC new | 27,918 | $365K | 0.3% | 2025-Q4 stale (2 quarters behind) |
| Worth Venture Partners, LLC trimmed | 17,365 | $227K | 0.2% | 2025-Q4 stale (2 quarters behind) |
| BOOTHBAY FUND MANAGEMENT, LLC trimmed | 12,998 | $170K | 0.1% | 2025-Q4 stale (2 quarters behind) |
| GSA CAPITAL PARTNERS LLP | 11,605 | $152K | 0.1% | 2025-Q4 stale (2 quarters behind) |
| Jump Financial, LLC trimmed | 10,577 | $138K | 0.1% | 2025-Q4 stale (2 quarters behind) |
| CITIGROUP INC new | 1 | $13 | 0.0% | 2025-Q4 stale (2 quarters behind) |
| Inflection Point Investments LLP trimmed | 314,991 | $5M | 3.5% | 2025-Q3 stale (3 quarters behind) |
| Diametric Capital, LP trimmed | 17,123 | $248K | 0.2% | 2025-Q3 stale (3 quarters behind) |
| Quadrature Capital Ltd added | 16,354 | $237K | 0.2% | 2025-Q3 stale (3 quarters behind) |
| Cubist Systematic Strategies, LLC new | 13,211 | $191K | 0.1% | 2025-Q3 stale (3 quarters behind) |
| P.A.W. CAPITAL CORP trimmed | 128,320 | $2M | 1.3% | 2025-Q2 stale (4 quarters behind) |
| Corton Capital Inc. new | 15,484 | $210K | 0.2% | 2025-Q2 stale (4 quarters behind) |
| NATIONAL BANK OF CANADA /FI/ new | 2,500 | $34K | 0.0% | 2025-Q2 stale (4 quarters behind) |
| CONCOURSE FINANCIAL GROUP SECURITIES, INC. | 0 | — | 0.0% | 2025-Q2 stale (4 quarters behind) |
1 parent filing withheld from the table above, and from the coverage figures, to avoid listing one book twice: TWO SIGMA ADVISERS, LP (last filed 2025-Q4, 14,600 shares) reconciles to its 1 current affiliate (14,588 shares) — 0.082% apart.
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.