78 tracked 13F filers disclose a position in XOMA as of the latest SEC 13F filings, a combined $318.3M 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 | BVF INC/IL | $81.3M | 2.6M | —Held | Q1 2026 | |
| 2 | MORGAN STANLEY | $53.4M | 1.7M | ▼−0.7% Reduced · −13K sh | Q1 2026 | |
| 3 | FMR LLC | $40.9M | 1.3M | ▲+12% Added · +141K sh | Q1 2026 | |
| 4 | BlackRock, Inc. | $20.3M | 647K | ▲+5.8% Added · +35K sh | Q1 2026 | |
| 5 | Woodline Partners LP | $20.1M | 640K | ▲+143% Added · +377K sh | Q1 2026 | |
| 6 | VANGUARD CAPITAL MANAGEMENT LLC | $17.2M | 550K | →First observed position No prior filed position | Q1 2026 | |
| 7 | Opaleye Management Inc. | $9.4M | 300K | ▲+2.5% Added · +7K sh | Q1 2026 | |
| 8 | GEODE CAPITAL MANAGEMENT, LLC | $10.4M | 245K | ▲+6.8% Added · +16K sh | Q2 2026 | |
| 9 | WATER ISLAND CAPITAL LLC | $10.3M | 242K | ▲New +242K sh | Q2 2026 | |
| 10 | MILLENNIUM MANAGEMENT LLC | $6.4M | 205K | ▲New +205K sh | Q1 2026 | |
| 11 | STATE STREET CORP | $8.4M | 198K | ▲+2.4% Added · +5K sh | Q2 2026 | |
| 12 | DIMENSIONAL FUND ADVISORS LP | $4.2M | 133K | ▲+208% Added · +90K sh | Q1 2026 | |
| 13 | CITADEL ADVISORS LLC | $3.1M | 99K | ▲New +99K sh | Q1 2026 | |
| 14 | NORTHERN TRUST CORP | $2.9M | 93K | ▲+3.4% Added · +3K sh | Q1 2026 | |
| 15 | VANGUARD PORTFOLIO MANAGEMENT LLC | $2.7M | 86K | →First observed position No prior filed position | Q1 2026 | |
| 16 | TORNO CAPITAL, LLC | $3.4M | 80K | ▲New +80K sh | Q2 2026 | |
| 17 | Bank of New York Mellon Corp | $2.4M | 75K | ▲+9.7% Added · +7K sh | Q1 2026 | |
| 18 | UBS Group AG | $2.3M | 73K | ▲+178% Added · +46K sh | Q1 2026 | |
| 19 | Verition Fund Management LLC | $3.0M | 71K | ▲New +71K sh | Q2 2026 | |
| 20 | Simcoe Capital LLC | $2.9M | 68K | —Held | Q2 2026 | |
| 21 | VANGUARD FIDUCIARY TRUST CO | $2.1M | 67K | →First observed position No prior filed position | Q1 2026 | |
| 22 | CREDIT INDUSTRIEL ET COMMERCIAL | $1.5M | 35K | ▲New +35K sh | Q2 2026 | |
| 23 | CHARLES SCHWAB INVESTMENT MANAGEMENT INC | $852K | 27K | ▼−7.6% Reduced · −2K sh | Q1 2026 | |
| 24 | TWO SIGMA INVESTMENTS, LP | $818K | 26K | ▲+168% Added · +16K sh | Q1 2026 | |
| 25 | SIERRA SUMMIT ADVISORS LLC | $1.1M | 26K | ▲New +26K sh | Q2 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, 14 funds opened a new position in XOMA and 7 added to an existing one, while 2 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 |
|---|---|---|
| APPLE INCAAPL | 29 funds | $109.4B |
| MICROSOFT CORPMSFT | 29 funds | $92.2B |
| NORFOLK SOUTHERN CORPNSC | 29 funds | $3.7B |
| NVIDIA CORPNVDA | 28 funds | $140.6B |
| AMAZON.COM INCAMZN | 28 funds | $61.0B |
| ALPHABET INC-CL CGOOG | 27 funds | $41.9B |
| TESLA INCTSLA | 27 funds | $25.7B |
| JOHNSON & JOHNSONJNJ | 27 funds | $14.2B |
| CISCO SYSTEMS INCCSCO | 27 funds | $9.6B |
| CHEVRON CORPCVX | 27 funds | $9.0B |
| CATERPILLAR INCCAT | 27 funds | $8.9B |
| GOLDMAN SACHS GROUP INCGS | 27 funds | $6.6B |
Ranked by how many of XOMA's institutional holders also hold each name, a cross-fund conviction signal.
| Date | Insider | Role | Action | Shares | Value |
|---|---|---|---|---|---|
| Dec 4, 2025 | Hughes Owen | Chief Executive Officer, Director | Buy (P) | 100K | $2.5M |
| Sep 22, 2025 | BURNS THOMAS M. | SVP, Finance & CFO | Sell (S) | 15 | $552 |
| Sep 22, 2025 | BURNS THOMAS M. | SVP, Finance & CFO | Sell (S) | 4K | $155K |
| Sep 22, 2025 | BURNS THOMAS M. | SVP, Finance & CFO | Sell (S) | 15 | $554 |
| Jun 30, 2025 | Sitko Bradley | Chief Investment Officer | Buy (P) | 2K | $51K |
| May 20, 2025 | BURNS THOMAS M. | SVP, Finance & CFO | Sell (S) | 10K | $266K |
| May 20, 2025 | Hughes Owen | Chief Executive Officer, Director | Sell (S) | 26K | $651K |
| May 16, 2025 | BVF GP HOLDINGS LLC | 10% Owner | Sell (S) | 127K | $3.5M |
| May 16, 2025 | BVF GP HOLDINGS LLC | 10% Owner | Sell (S) | 265K | $7.2M |
| Apr 7, 2025 | LIMBER JOSEPH M | Director | Buy (P) | 5K | $134K |
| Apr 7, 2025 | Sitko Bradley | Chief Investment Officer | Buy (P) | 2K | $49K |
| Apr 4, 2025 | LIMBER JOSEPH M | Director | Buy (P) | 3K | $88K |
Connected entities for XOMA
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/XOMA/capital-change-brief"
Use Arkolith's capital_change_brief for XOMA. 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 XOMA. Filings are public domain, sourced to SEC EDGAR; price series derived from end-of-day closes.