Prothena Corp Public (PRTA) Tax Rate (2014 - 2026)
Prothena Corp Public (PRTA) posted Tax Rate of -0.01% for Q2 2026, up 55.32 percentage points from -55.34% a year earlier but down 0.01 percentage points from the prior quarter.
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Analysis
Prothena Corp Public (PRTA) Tax Rate (2014 - 2026) Analysis & Trends
For the trailing twelve months through Jun 30, 2026, Tax Rate at Prothena Corp Public was 0.98%, up 16.74 percentage points year-over-year; for FY2025, it came in at -21.54%, down 26.68 percentage points from FY2024.
- Annual Tax Rate shows a five-year change of -21.80 percentage points (FY2020 to FY2025).
- In prior years, Prothena Corp Public's Tax Rate was 5.13% in FY2024 (-3.25 pp), 8.38% in FY2023 (+1.49 pp), 6.89% in FY2022 (+0.01 pp) and 6.88% in FY2021 (+6.62 pp).
- Quarterly Tax Rate has run from a low of -88.37% in Q4 2022 to a high of 7.31% in Q2 2023 over five years.
- On a year-over-year basis, Tax Rate increased in two of the last eight quarters, with an average year-over-year change of +1.68 percentage points.
- The strongest year-over-year quarter for Tax Rate in the past five years was Q4 2023, with a gain of 92.82 percentage points; the weakest was Q4 2022, with a drop of 88.23 percentage points.
- According to Business Quant data, Tax Rate for the three prior quarters was 0.00% (Q1 2026), 0.17% (Q4 2025) and 1.08% (Q3 2025).
Peer Set
Peer Comparison
| # | Company | Market Cap | Enterprise Value | Gross Profit (Qtr) | Tax Rate (Qtr) |
|---|---|---|---|---|---|
| 1 | Johnson & Johnson | 655.56 Bn | 574.09 Bn | 17.26 Bn | 17.98% |
| 2 | AbbVie | 470.94 Bn | 444.10 Bn | 12.70 Bn | 15.47% |
| 3 | Merck | 367.14 Bn | 321.57 Bn | 12.21 Bn | - |
| 4 | Novartis Ag | 280.33 Bn | 236.20 Bn | 11.24 Bn | - |
| 5 | Astrazeneca | 257.78 Bn | 231.34 Bn | 12.86 Bn | - |
| 6 | Amgen | 226.04 Bn | 181.44 Bn | 7.24 Bn | 14.20% |
| 7 | Gilead Sciences | 188.89 Bn | 163.01 Bn | 6.22 Bn | - |
| 8 | Pfizer | 163.75 Bn | 110.70 Bn | 10.94 Bn | - |
| 9 | Vertex Pharmaceuticals | 133.68 Bn | 105.69 Bn | 2.84 Bn | 20.98% |
| 10 | Prothena Corp Public | 451.21 Mn | -804.86 Mn | - | - |
Historic Data
Download Data
Historic Data
| Date | Value |
|---|---|
| Mar 31, 2026 | 0.00% |
| Jun 30, 2021 | 1.08% |
| Jun 30, 2014 | 18.66% |
| Mar 31, 2014 | 0.84% |
API Access
Prothena Corp Public Tax Rate API
Pull this series into your own models, spreadsheets and apps with the Business Quant
Historical Metrics API. The request below matches the chart above — change the
frequency, period or values and it follows. Swap YOUR_API_KEY for your own key.
https://data.businessquant.com/historic?slug=tax-rate&ticker=PRTA&period=max&api_key=YOUR_API_KEYimport requests
url = "https://data.businessquant.com/historic"
params = {"slug": "tax-rate", "ticker": "PRTA", "period": "max", "api_key": "YOUR_API_KEY"}
data = requests.get(url, params=params).json()const res = await fetch("https://data.businessquant.com/historic?slug=tax-rate&ticker=PRTA&period=max&api_key=YOUR_API_KEY");
const data = await res.json();