Ticker · CUSIP 98419J206
Holders (tracked)
3
Combined shares
78,323
Combined value
$2.08M
Last close
$39.71
Quarter
2025Q4
Price · 1Y$39.71+18.53 (+87.49%)H $40.13 · L $21.18 · Avg Vol 146K
Position opened
Tracked holders · last 8 quarters
Flat over the last 8 quarters.
Price is +49.3% vs the avg quarter-end implied price across tracked holders.
SEC event timeline
6 events
- Ken Griffin (Citadel Advisors) exited2026-02-17−7,581 shares · 2025Q4Position
- Two Sigma Investments opened position2026-02-17+9,715 shares · 2025Q4Position
- Wellington Management trimmed2026-02-17−3,025 shares · 2025Q4Position
- Renaissance Technologies added2026-02-12+10,117 shares · 2025Q4Position
- Wellington Management opened position2025-11-14+32,616 shares · 2025Q3Position
- Renaissance Technologies added2025-11-13+17,000 shares · 2025Q3Position
Insider activity
Last 30 days
Net (open-market)
$0
Buys
0 · $0
Sells
0 · $0
Unique insiders
1
| Date | Insider | Code | Shares | Price | Value |
|---|---|---|---|---|---|
| 04-13 | Trigilio Jeffrey Chief Financial Officer · Insider | F | 1,632 | $36.76 | $60.0K |
| 04-13 | Trigilio Jeffrey Chief Financial Officer · Insider | M | 4,000 | — | $0 |
Follow-the-investor returns
If you'd copied each holder of XOMA…
Cost basis inferred from each manager's quarter-over-quarter position changes. Sorted by % return on the position they're still holding.
| Investor | First in | Cost basis | Return | Position value today |
|---|---|---|---|---|
| Two Sigma Investments | 2017Q3 | $29.58 | +34.2% | $386K |
| Renaissance Technologies | 2018Q1 | $30.67 | +29.5% | $1.5M |
| Wellington Management | 2025Q3 | $38.54 | +3.0% | $1.2M |
Who moved on this name in 2025Q4
Position changes reported for the latest quarter, grouped by direction.
New positions1
- Two Sigma Investments+9,715$258K
Added to1
- Renaissance Technologies+10,117$269K
Trimmed1
- Wellington Management−3,025$80K
Exited1
- Ken Griffin (Citadel Advisors)−7,581$292K
Institutional ownership over time
Distinct super-investors holding this ticker · combined dollar value, by quarter.
| Quarter | Holders | Combined value |
|---|---|---|
| 2022Q1 | 3 | $13.9M |
| 2022Q2 | 6 | $8.6M |
| 2022Q3 | 5 | $3.9M |
| 2022Q4 | 6 | $3.8M |
| 2023Q1 | 7 | $5.8M |
| 2023Q2 | 7 | $11.1M |
| 2023Q3 | 6 | $7.8M |
| 2023Q4 | 6 | $10.5M |
| 2024Q1 | 5 | $12.4M |
| 2024Q2 | 5 | $12.8M |
| 2024Q3 | 5 | $1.0M |
| 2024Q4 | 4 | $816K |
| 2025Q1 | 5 | $759K |
| 2025Q2 | 1 | $300K |
| 2025Q3 | 3 | $2.7M |
| 2025Q4 | 3 | $2.1M |
Who owns XOMA
3 super-investors · 2025Q4
Tracked stake
78.3K
shares
Combined value
$2M
% of shares outstanding
—
shares-out unknown
Quarter action mix
New1Added1Trim1
| # | Manager | Shares | Value |
|---|---|---|---|
| 1 | Renaissance Technologies | 39.0K | $1M |
| 2 | Wellington Management | 29.6K | $787K |
| 3 | Two Sigma Investments | 9.7K | $258K |
Recent moves
20 transactions
- −7,581 · 2025Q4
- −3,025 · 2025Q4
- +9,715 · 2025Q4
- +10,117 · 2025Q4
- +32,616 · 2025Q3
- +17,000 · 2025Q3
- −14,054 · 2025Q2
- −1,800 · 2025Q2
- +14,054 · 2025Q1
- −2,400 · 2025Q1
- −15,293 · 2024Q4
- +7,619 · 2024Q4
- +15,293 · 2024Q3
- SOLDT. Rowe Price−8,778 · 2024Q3
- +8,481 · 2024Q3
- ADDBlackRock+31,977 · 2024Q2
- −28,301 · 2024Q1
- +8,778 · 2024Q1
- −12,296 · 2024Q1
- TRIMBlackRock−7,977 · 2024Q1
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