Health Care · Pharmaceutical Preparations · Nasdaq · CIK 1559053 · FYE Dec 31 · Prices AT CLOSE 2026-08-21 (USD) Last $9.45 · Day +4.65% · Mkt cap $485M · 1Y +10.4% · Off 52W high −19.9% · Vol (1Y) 47.5% Price2023-08-21 → 2026-08-21 PRTA close: $57.2 on 2023-08-21 to $9.5 on 2026-08-21. Split-adj closes · 240 of 3,434 · price returnⓘ At a glance | Short interest15.9% of sh out | | Days to cover14.0d | | 13F net flow (QoQ)+0.46% | | Top-10 13F concentration59.4% | | Next report (est.)2026-11-06 |
SI 2026-07-31 · 13F 2026-Q1ⓘ Key fundamentalsFY 2025 | Sales (TTM)$54.5M | | Earnings (TTM)-$44.0M | | ROE−63.6% | | Net margin−2520.6% | | Sales growth 3Y−43.6% |
FY ratios · TTM sales/earnings (USD)ⓘ Trailing returns | YTD−1.0% | | 1Y+10.4% | | 3Y−83.5% | | 5Y−84.8% | | 10Y−82.6% | | Since incept. (ann.)+2.0% |
Total return · from 2012-12-21ⓘ Risk | Ann. volatility (1Y)47.5% | | Ann. volatility (3Y)65.0% | | Sharpe (1Y)0.45 | | Sharpe (3Y)−0.60 | | Max drawdown (1Y)−29.5% | | Max drawdown (3Y)−92.0% | | Beta (3Y vs SPY)0.86 |
Daily returns, ann.ⓘ Top institutional holders13F 2026-Q1 | Manager | Shares | Value | % sh out | QoQ |
|---|
| FMR LLC | 7.6M | $73M | 14.03% | +0.0% | | Rubric Capital Management LP | 5.0M | $49M | 9.29% | +36.0% | | BlackRock, Inc. | 4.6M | $45M | 8.63% | +13.1% | | STATE STREET CORP | 1.9M | $19M | 3.60% | −14.5% | | D. E. Shaw & Co., Inc. | 1.8M | $17M | 3.28% | +4.9% | | ADAR1 Capital Management, LLC | 1.6M | $15M | 2.94% | +8.5% | | ACADIAN ASSET MANAGEMENT LLC | 1.5M | $15M | 2.87% | +7.7% | | VANGUARD PORTFOLIO MANAGEMENT LLC | 1.4M | $14M | 2.69% | new |
Δ vs 2025-Q4ⓘ Latest reported quarterslast report 2026-08-06 | Period end | Reported | EPS | EPS YoY | Revenue | Rev YoY |
|---|
| 2026-06-30 | 2026-08-06 | −$0.36 | — | $1.0M | −77.1% | | 2026-03-31 | 2026-05-07 | $0.60 | — | $51.1M | +1706.4% | | 2025-12-31 | 2026-02-19 | −$0.39 | — | $21,000 | −99.0% | | 2025-09-30 | 2025-11-06 | −$0.68 | — | $2.4M | +149.0% |
As-reported XBRL · next 2026-11-06 est.ⓘ Segment mixFY2025 (ended Dec 2025) Collaboration 99% · License 1% product & service · TAGGED revenueⓘ Basis & disclosures - EOD closes · nothing imputed or averaged · absent “—”
- As-of differs by block · 13F = US long, 45+d lag, LOWER bound
- Not investment advice · no recommendation, price target or solicitation
- EDGAR + foreign registers · marketstack (licensed EOD) · spzco.com/methodology
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