The public view is the crawlable proof. The same sourced dataset is available through REST and MCP for agents, research scripts, and back-office tools.
This stock page is the Follow view. The Build view lets your agent query RBBN owners, fund changes, insider filings, and source links through REST or MCP.
curl -H "Authorization: Bearer YOUR_API_KEY" \ "https://arkolith.com/api/v1/stocks/RBBN"
Use Arkolith to show who owns RBBN, which funds added or reduced it, and which SEC filings prove each claim.
| # | Fund | Position value | Shares | Last move | As of | History |
|---|---|---|---|---|---|---|
| 1 | PARADIGM CAPITAL MANAGEMENT INC/NY | $17.0M | 8.0M | ▼−3.4% Reduced · −287K sh | Q1 2026 | |
| 2 | VANGUARD PORTFOLIO MANAGEMENT LLC | $7.1M | 3.3M | ▲New +3.3M sh | Q1 2026 | |
| 3 | GEODE CAPITAL MANAGEMENT, LLC | $5.1M | 2.4M | ▲+4.9% Added · +112K sh | Q1 2026 | |
| 4 | Connor, Clark & Lunn Investment Management Ltd. | $4.4M | 2.1M | ▲+4.7% Added · +94K sh | Q1 2026 | |
| 5 | STATE STREET CORP | $4.0M | 1.9M | ▼−9.0% Reduced · −190K sh | Q1 2026 | |
| 6 | JACOBS LEVY EQUITY MANAGEMENT, INC | $1.5M | 685K | ▼−23% Reduced · −205K sh | Q1 2026 | |
| 7 | VANGUARD FIDUCIARY TRUST CO | $1.2M | 587K | ▲New +587K sh | Q1 2026 | |
| 8 | CITADEL ADVISORS LLC | $1.2M | 575K | ▲11× Added · +521K sh | Q1 2026 | |
| 9 | OP Asset Management Ltd | $438K | 207K | ▲New +207K sh | Q1 2026 | |
| 10 | Engineers Gate Manager LP | $297K | 140K | ▲+152% Added · +84K sh | Q1 2026 | |
| 11 | BRIDGEWAY CAPITAL MANAGEMENT, LLC | $187K | 88K | ▲New +88K sh | Q1 2026 | |
| 12 | PUBLIC EMPLOYEES RETIREMENT SYSTEM OF OHIO | $129K | 61K | —Held | Q1 2026 | |
| 13 | Vident Advisory, LLC | $106K | 50K | ▲New +50K sh | Q1 2026 | |
| 14 | WINTON GROUP Ltd | $106K | 50K | ▲+51% Added · +17K sh | Q1 2026 | |
| 15 | MetLife Investment Management, LLC | $84K | 39K | ▲+5.7% Added · +2K sh | Q1 2026 | |
| 16 | STATE BOARD OF ADMINISTRATION OF FLORIDA RETIREMENT SYSTEM | $80K | 38K | —Held | Q1 2026 | |
| 17 | Police & Firemen's Retirement System of New Jersey | $52K | 25K | —Held | Q1 2026 | |
| 18 | Essex Financial Services, Inc. | $52K | 25K | ▲+0.6% Added · +143 sh | Q1 2026 | |
| 19 | INTECH INVESTMENT MANAGEMENT LLC | $47K | 22K | ▼−19% Reduced · −5K sh | Q1 2026 | |
| 20 | Schonfeld Strategic Advisors LLC | $46K | 22K | ▲New +22K sh | Q1 2026 | |
| 21 | Vestmark Advisory Solutions, Inc. | $34K | 16K | ▲New +16K sh | Q1 2026 | |
| 22 | NewEdge Wealth, LLC | $34K | 16K | ▲New +16K sh | Q1 2026 | |
| 23 | Trilogy Capital Inc. | $33K | 15K | ▼−76% Reduced · −50K sh | Q1 2026 | |
| 24 | IEQ CAPITAL, LLC | $30K | 14K | ▲New +14K sh | Q1 2026 | |
| 25 | WEALTH ENHANCEMENT ADVISORY SERVICES, LLC | $30K | 14K | ▲New +14K sh | Q1 2026 |
Holders and values reflect the 13F filers Arkolith currently tracks, not the entire institutional universe. Counts and totals are a floor, not the full institutional ownership.
| Date | Insider | Role | Action | Shares | Value |
|---|---|---|---|---|---|
| Jun 16, 2026 | Tamone Tanya | Director | Option exercise (M) | 43K | — |
| Jun 16, 2026 | Tamone Tanya | Director | Option exercise (M) | 43K | $0 |
| Jun 15, 2026 | Bucci Sam | EVP, Chief Operating Officer | Grant (A) | 150K | $0 |
| Jun 15, 2026 | McCaffery Stephen J. | EVP, Global Sales | Grant (A) | 120K | $0 |
| Jun 15, 2026 | Marmurek Eric S | EVP, Chief Financial Officer | Grant (A) | 90K | $0 |
| Jun 15, 2026 | Marmurek Eric S | EVP, Chief Financial Officer | Grant (A) | 60K | $0 |
| Jun 15, 2026 | Macken Patrick W | EVP, Chief Legal Officer | Grant (A) | 163K | $0 |
| Jun 15, 2026 | Macken Patrick W | EVP, Chief Legal Officer | Grant (A) | 98K | $0 |
| Jun 15, 2026 | Bucci Sam | EVP, Chief Operating Officer | Grant (A) | 250K | $0 |
| Jun 15, 2026 | McCaffery Stephen J. | EVP, Global Sales | Grant (A) | 80K | $0 |
| Jun 15, 2026 | McCaffery Stephen J. | EVP, Global Sales | Grant (A) | 200K | $0 |
| Jun 15, 2026 | Bucci Sam | EVP, Chief Operating Officer | Grant (A) | 100K | $0 |
| Company | Co-held by | Combined value |
|---|---|---|
| BROADCOM INCAVGO | 41 funds | $8.5B |
| MICROSOFT CORPMSFT | 40 funds | $16.4B |
| AMAZON.COM INCAMZN | 40 funds | $11.8B |
| META PLATFORMS INC-CLASS AMETA | 40 funds | $7.7B |
| ELI LILLY & COLLY | 40 funds | $4.3B |
| BERKSHIRE HATHAWAY INC-CL BBRK/B | 40 funds | $4.2B |
| JOHNSON & JOHNSONJNJ | 40 funds | $3.5B |
| COSTCO WHOLESALE CORPCOST | 40 funds | $3.2B |
| MASTERCARD INC - AMA | 40 funds | $3.0B |
| PALANTIR TECHNOLOGIES INC-APLTR | 40 funds | $2.2B |
| BANK OF AMERICA CORPBAC | 40 funds | $1.7B |
| SALESFORCE INCCRM | 40 funds | $1.4B |
Ranked by how many of RBBN's institutional holders also hold each name, a cross-fund conviction signal. Via the MCP server (ticker.co_held).
13F holdings + Form 4 insider transactions + end-of-day price history + the live filing stream, joined for RBBN. Filings are public domain, sourced to SEC EDGAR; price series derived from end-of-day closes. Every panel above is one call to the Arkolith API & MCP server.