289 tracked 13F filers disclose a position in RARE as of the latest SEC 13F filings, a combined $2.4B 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 | RTW INVESTMENTS, LP | $260.3M | 7.8M | ▲+114% Added · +4.1M sh | Q2 2026 | |
| 2 | BlackRock, Inc. | $152.9M | 7.3M | ▲+10% Added · +668K sh | Q1 2026 | |
| 3 | STATE STREET CORP | $205.6M | 6.2M | ▲+23% Added · +1.1M sh | Q2 2026 | |
| 4 | VANGUARD PORTFOLIO MANAGEMENT LLC | $112.8M | 5.4M | →First observed position No prior filed position | Q1 2026 | |
| 5 | AQR CAPITAL MANAGEMENT LLC | $95.9M | 4.6M | ▲+236% Added · +3.2M sh | Q1 2026 | |
| 6 | VANGUARD CAPITAL MANAGEMENT LLC | $87.8M | 4.2M | →First observed position No prior filed position | Q1 2026 | |
| 7 | SANDS CAPITAL MANAGEMENT, LLC | $105.5M | 3.2M | ▼−1.7% Reduced · −56K sh | Q2 2026 | |
| 8 | FRONTIER CAPITAL MANAGEMENT CO LLC | $95.1M | 2.8M | ▲+30% Added · +657K sh | Q2 2026 | |
| 9 | GEODE CAPITAL MANAGEMENT, LLC | $86.1M | 2.6M | ▲+39% Added · +729K sh | Q2 2026 | |
| 10 | TWO SIGMA INVESTMENTS, LP | $46.2M | 2.2M | ▲+420% Added · +1.8M sh | Q1 2026 | |
| 11 | CITADEL ADVISORS LLC | $44.3M | 2.1M | ▼−9.1% Reduced · −211K sh | Q1 2026 | |
| 12 | Bellevue Group AG | $66.2M | 2.0M | ▼−17% Reduced · −397K sh | Q2 2026 | |
| 13 | MILLENNIUM MANAGEMENT LLC | $37.1M | 1.8M | ▲+101% Added · +892K sh | Q1 2026 | |
| 14 | Sofinnova Investments, Inc. | $57.3M | 1.7M | ▼−45% Reduced · −1.4M sh | Q2 2026 | |
| 15 | MORGAN STANLEY | $31.4M | 1.5M | ▼−18% Reduced · −326K sh | Q1 2026 | |
| 16 | JACOBS LEVY EQUITY MANAGEMENT, INC | $30.0M | 1.4M | ▼−18% Reduced · −318K sh | Q1 2026 | |
| 17 | NORGES BANK | $29.0M | 1.3M | ▲+28% Added · +277K sh | Q4 2025 | |
| 18 | D. E. Shaw & Co., Inc. | $26.4M | 1.3M | ▲+266% Added · +916K sh | Q1 2026 | |
| 19 | VOLORIDGE INVESTMENT MANAGEMENT, LLC | $41.5M | 1.2M | ▼−13% Reduced · −185K sh | Q2 2026 | |
| 20 | BANK OF AMERICA CORP /DE/ | $21.9M | 1.0M | ▼−14% Reduced · −167K sh | Q1 2026 | |
| 21 | Candriam S.C.A. | $33.4M | 1.0M | ▼−8.6% Reduced · −94K sh | Q2 2026 | |
| 22 | Rock Springs Capital Management LP | $32.3M | 968K | ▼−21% Reduced · −251K sh | Q2 2026 | |
| 23 | Jefferies Financial Group Inc. | $31.0M | 930K | ▲60× Added · +914K sh | Q2 2026 | |
| 24 | Qube Research & Technologies Ltd | $19.2M | 915K | ▲New +915K sh | Q1 2026 | |
| 25 | Point72 Asset Management, L.P. | $18.7M | 893K | ▲New +893K 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, 7 funds opened a new position in RARE and 31 added to an existing one, while 25 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 |
|---|---|---|
| NVIDIA CORPNVDA | 157 funds | $346.3B |
| AMAZON.COM INCAMZN | 157 funds | $171.9B |
| ELI LILLY & COLLY | 157 funds | $66.6B |
| MICROSOFT CORPMSFT | 156 funds | $234.0B |
| META PLATFORMS INC-CLASS AMETA | 153 funds | $98.1B |
| BROADCOM INCAVGO | 151 funds | $134.9B |
| BOSTON SCIENTIFIC CORPBSX | 150 funds | $14.3B |
| ALPHABET INC-CL AGOOGL | 149 funds | $140.0B |
| LAM RESEARCH CORPLRCX | 149 funds | $31.0B |
| INTUITIVE SURGICAL INCISRG | 148 funds | $23.4B |
| JPMORGAN CHASE & COJPM | 147 funds | $53.4B |
| MICRON TECHNOLOGY INCMU | 147 funds | $36.5B |
Ranked by how many of RARE's institutional holders also hold each name, a cross-fund conviction signal.
| Date | Insider | Role | Action | Shares | Value |
|---|---|---|---|---|---|
| Aug 3, 2026 | Parschauer Karah Herdman | EVP and Chief Legal Officer | Sell (S) | 2K | $47K |
| Aug 3, 2026 | Horn Howard | Chief Financial Officer | Sell (S) | 5K | $117K |
| Jul 1, 2026 | Horn Howard | Chief Financial Officer | Sell (S) | 5K | $156K |
| Jun 15, 2026 | Parschauer Karah Herdman | EVP and Chief Legal Officer | Sell (S) | 2K | $47K |
| Jun 15, 2026 | Sanders Corazon (Corsee) D. | Director | Sell (S) | 2K | $50K |
| Jun 1, 2026 | Horn Howard | Chief Financial Officer | Sell (S) | 5K | $111K |
| May 18, 2026 | SULIMAN SHEHNAAZ | Director | Sell (S) | 6K | $144K |
| May 5, 2026 | Crombez Eric | EVP and Chief Medical Officer | Sell (S) | 344 | $9K |
| May 1, 2026 | Horn Howard | Chief Financial Officer | Sell (S) | 5K | $117K |
| Apr 1, 2026 | Horn Howard | Chief Financial Officer | Sell (S) | 5K | $98K |
| Mar 10, 2026 | Parschauer Karah Herdman | EVP and Chief Legal Officer | Sell (S) | 4K | $80K |
| Mar 6, 2026 | Parschauer Karah Herdman | EVP and Chief Legal Officer | Sell (S) | 6K | $129K |
Connected entities for RARE
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/RARE/capital-change-brief"
Use Arkolith's capital_change_brief for RARE. 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 RARE. Filings are public domain, sourced to SEC EDGAR; price series derived from end-of-day closes.