337 tracked 13F filers disclose a position in OPEN as of the latest SEC 13F filings, a combined $2.2B in reported value. 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.
| # | Fund | Position value | Shares | Last move | As of | History |
|---|---|---|---|---|---|---|
| 1 | MORGAN STANLEY | $481.0M | 102.8M | ▲+99% Added · +51.2M sh | Q1 2026 | |
| 2 | VANGUARD PORTFOLIO MANAGEMENT LLC | $327.9M | 70.1M | →First observed position No prior filed position | Q1 2026 | |
| 3 | VANGUARD CAPITAL MANAGEMENT LLC | $166.3M | 35.5M | →First observed position No prior filed position | Q1 2026 | |
| 4 | GEODE CAPITAL MANAGEMENT, LLC | $115.3M | 25.0M | ▲+102% Added · +12.6M sh | Q2 2026 | |
| 5 | STATE STREET CORP | $100.6M | 21.8M | ▲+264% Added · +15.8M sh | Q2 2026 | |
| 6 | BlackRock, Inc. | $87.2M | 18.6M | ▲+4.1% Added · +729K sh | Q1 2026 | |
| 7 | JANE STREET GROUP, LLC | $68.9M | 14.7M | ▲+6.0% Added · +841K sh | Q1 2026 | |
| 8 | AMERICAN CENTURY COMPANIES INC | $66.5M | 14.2M | ▼−1.0% Reduced · −145K sh | Q1 2026 | |
| 9 | RENAISSANCE TECHNOLOGIES LLC | $55.3M | 11.8M | ▼−70% Reduced · −27.5M sh | Q1 2026 | |
| 10 | D. E. Shaw & Co., Inc. | $52.6M | 11.2M | ▲+74% Added · +4.8M sh | Q1 2026 | |
| 11 | CHARLES SCHWAB INVESTMENT MANAGEMENT INC | $52.6M | 11.2M | ▼−3.9% Reduced · −454K sh | Q1 2026 | |
| 12 | MILLENNIUM MANAGEMENT LLC | $50.7M | 10.8M | ▲+123% Added · +6.0M sh | Q1 2026 | |
| 13 | Qube Research & Technologies Ltd | $47.5M | 10.2M | ▲+683% Added · +8.9M sh | Q1 2026 | |
| 14 | DIMENSIONAL FUND ADVISORS LP | $42.5M | 9.1M | ▲+97% Added · +4.5M sh | Q1 2026 | |
| 15 | CITADEL ADVISORS LLC | $37.6M | 8.0M | ▲+5.4% Added · +412K sh | Q1 2026 | |
| 16 | UBS Group AG | $33.6M | 7.2M | ▲+31% Added · +1.7M sh | Q1 2026 | |
| 17 | TWO SIGMA INVESTMENTS, LP | $31.7M | 6.8M | ▲+66% Added · +2.7M sh | Q1 2026 | |
| 18 | CAPITAL FUND MANAGEMENT S.A. | $25.0M | 5.4M | ▲+141% Added · +3.2M sh | Q2 2026 | |
| 19 | Marex Group plc | $23.1M | 4.9M | ▼−15% Reduced · −881K sh | Q1 2026 | |
| 20 | VANGUARD FIDUCIARY TRUST CO | $22.9M | 4.9M | →First observed position No prior filed position | Q1 2026 | |
| 21 | Daiwa Securities Group Inc. | $21.6M | 4.7M | ▲New +4.7M sh | Q2 2026 | |
| 22 | Trexquant Investment LP | $19.0M | 4.1M | ▲+127% Added · +2.3M sh | Q1 2026 | |
| 23 | GOLDMAN SACHS GROUP INC | $18.5M | 3.9M | ▲+151% Added · +2.4M sh | Q1 2026 | |
| 24 | Privium Fund Management B.V. | $18.2M | 3.9M | ▲New +3.9M sh | Q2 2026 | |
| 25 | SUSQUEHANNA INTERNATIONAL GROUP, LLP | $15.6M | 3.3M | ▲35× Added · +3.2M 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.
Last quarter, 5 funds opened a new position in OPEN and 23 added to an existing one, while 13 reduced and 0 exited entirely — based on 13F filings from active, signal-eligible managers (passive index funds and other mechanical holders are excluded from this count).
| Company | Co-held by | Combined value |
|---|---|---|
| AMAZON.COM INCAMZN | 178 funds | $130.6B |
| MICROSOFT CORPMSFT | 177 funds | $180.3B |
| META PLATFORMS INC-CLASS AMETA | 177 funds | $74.8B |
| NVIDIA CORPNVDA | 176 funds | $270.8B |
| APPLE INCAAPL | 173 funds | $201.7B |
| ALPHABET INC-CL AGOOGL | 173 funds | $98.6B |
| BROADCOM INCAVGO | 171 funds | $106.2B |
| TESLA INCTSLA | 171 funds | $52.3B |
| INTEL CORPINTC | 171 funds | $14.9B |
| ELI LILLY & COLLY | 169 funds | $54.8B |
| ALPHABET INC-CL CGOOG | 168 funds | $89.9B |
| MICRON TECHNOLOGY INCMU | 168 funds | $30.4B |
Ranked by how many of OPEN's institutional holders also hold each name, a cross-fund conviction signal.
| Date | Insider | Role | Action | Shares | Value |
|---|---|---|---|---|---|
| Aug 14, 2026 | Nejatian Kasra | Chief Executive Officer, Director | Buy (P) | 28K | $100K |
| Jul 15, 2026 | Nguyen Giang | Chief Operating Officer | Sell (S) | 4K | $17K |
| Jun 16, 2026 | Benson David C | Director | Sell (S) | 40K | $193K |
| May 15, 2026 | Schwartz Christina | Chief Financial Officer | Sell (S) | 74K | $322K |
| May 11, 2026 | Nejatian Kasra | Chief Executive Officer, Director | Buy (P) | 100K | $488K |
| Apr 15, 2026 | Nguyen Giang | Chief Operating Officer | Sell (S) | 11K | $50K |
| Feb 17, 2026 | Schwartz Christina | Chief Financial Officer | Sell (S) | 74K | $321K |
| Nov 17, 2025 | Schwartz Christina | See Remarks | Sell (S) | 74K | $584K |
| Nov 11, 2025 | Nejatian Kasra | Chief Executive Officer, Director | Buy (P) | 125K | $1.0M |
| Sep 26, 2025 | Wu Eric Chung-Wei | Director | Buy (P) | 301K | $2.0M |
| Sep 11, 2025 | Wu Eric Chung-Wei | Director | Buy (P) | 451K | $3.0M |
| Aug 28, 2025 | Radhakrishna Shrisha | President | Buy (P) | 2K | $7K |
| Class | 13F holders | Value held |
|---|---|---|
| OPENthis pagecs | 337 funds | $2.2B |
| OPENWwt | 120 funds | $3.0M |
| OPENLwt | 120 funds | $1.5M |
| OPENZwt | 116 funds | $3.4M |
| 683712AA10.250 08/15/26 CVT | 1 funds | $8.1M |
| 683712903CALL | 1 funds | $1K |
Same issuer, multiple share classes. The consensus leaderboards count this company once across all classes; this is the per-class detail.
Connected entities for OPEN
This stock page is the public Follow view. For one current, evidence-backed answer, use capital_change_brief through REST or MCP. It compares tracked 13F changes with qualifying Form 4 activity and cites the SEC evidence.
curl -H "Authorization: Bearer YOUR_API_KEY" \ "https://arkolith.com/api/v1/stocks/OPEN/capital-change-brief"
Use Arkolith's capital_change_brief for OPEN. Tell me what changed, whether insider activity corroborates it, and cite the SEC evidence.
13F holdings + Form 4 insider transactions + end-of-day price history + the live filing stream, joined for OPEN. Filings are public domain, sourced to SEC EDGAR; price series derived from end-of-day closes.