EcoR1 Capital, LLC: JAZZ PHARMACEUTICALS PLC (JAZZ): Quarterly 13F Position History
As of Q1 2026, EcoR1 Capital, LLC reported 1,706,469 shares of JAZZ PHARMACEUTICALS PLC (JAZZ), worth $322.6M and representing 13.8% of its 13F equity book. The position first appeared in Q2 2023 and has been disclosed across 12 13F-HR filings in Pactolio's tracked window.
- 1,706,469Shares Held (Latest Filing)
- $322.6MReported Market Value (Latest Filing)
- 13.8%Portfolio Weight (% of 13F Equity Book)
- 0Quarter-over-Quarter Share Change
- +$32.5MQuarter-over-Quarter Value Change
- 1,706,469Peak Reported Shares (Historical)
Quarterly 13F-HR Disclosure History Source: SEC 13F-HR filings, 12 quarter s
| Quarter | Shares | QoQ Share Change | Share Change (%) | Market Value | Weight | Implied Price |
|---|---|---|---|---|---|---|
| Q1 2026 | 1,706,469 | 0 | — | $322.6M | 13.8% | $189.1 |
| Q4 2025 | 1,706,469 | 0 | — | $290.1M | 13.2% | $170.0 |
| Q3 2025 | 1,706,469 | 0 | — | $224.9M | 10.8% | $131.8 |
| Q2 2025 | 1,706,469 | 0 | — | $181.1M | 10.7% | $106.1 |
| Q1 2025 | 1,706,469 | 0 | — | $211.9M | 12.6% | $124.2 |
| Q4 2024 | 1,706,469 | 0 | — | $210.2M | 8.4% | $123.2 |
| Q3 2024 | 1,706,469 | +692,517 | +68.3% | $190.1M | 6.5% | $111.4 |
| Q2 2024 | 1,013,952 | 0 | — | $108.2M | 3.3% | $106.7 |
| Q1 2024 | 1,013,952 | 0 | — | $122.1M | 3.1% | $120.4 |
| Q4 2023 | 1,013,952 | +645,541 | +175.2% | $124.7M | 3.2% | $123.0 |
| Q3 2023 | 368,411 | 0 | — | $47.7M | 1.6% | $129.4 |
| Q2 2023 | 368,411 | — | — | $45.7M | 1.2% | $124.0 |
Methodology & FAQ
How This Position History Is Sourced
Each row is one SEC Form 13F-HR filing disclosing this position. Share count, market value, and reported quarter are taken verbatim from the filing; portfolio weight is recomputed against the same filing's total reported equity book. Implied price-per-share is market value divided by shares — a quarter-end mark, not the manager's cost basis. See the full methodology document for the normalization rules.
When did EcoR1 Capital, LLC first disclose a JAZZ position in 13F-HR filings?
EcoR1 Capital, LLC first reported JAZZ PHARMACEUTICALS PLC (JAZZ) on its 13F-HR filing for the period ending 2023-06-30 (Q2 2023). The position has appeared on 12 reported quarters within Pactolio's tracked window.
What was EcoR1 Capital, LLC's most recent quarter-over-quarter share-count change in JAZZ?
EcoR1 Capital, LLC held the same 1,706,469 shares of JAZZ between Q4 2025 and Q1 2026 — the reported share count was unchanged quarter-over-quarter.
Does the implied price-per-share represent EcoR1 Capital, LLC's cost basis in JAZZ?
No. The implied price-per-share column is the 13F-HR reported market value divided by reported share count on the filing date (end of quarter). It is a quarter-end mark, not a cost basis or transaction price. Use it as a sanity check on the value column, not as an indicator of the manager's entry or exit price.