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Overview
Smart money at a glance
Filings to Oct 1, 2026Net buying: insiders sold $136K and bought $4.2M on the open market in 90 days (SEC Form 4). Congress: no trades disclosed in 180 days.
- Company insidersSEC Form 4, last 90 days
- +$4M netNet buying
- CongressSTOCK Act, last 180 days
- NoneNo trades disclosed
- Big fundsSEC 13F, latest quarter
- NoneNo large changes
- Federal contractsUSAspending.gov, last 12 months
- No awardsNone on record
Key stats
Fundamentals Oct 1- Open
- $8.98
- 52-wk high
- $11.80
- High
- $8.99
- 52-wk low
- $7.73
- Low
- $8.37
- Prev close
- $8.78
- Mkt cap
- $450.7M
- Volume
- 634.8K
- Fwd P/E
- 10.6x
- Beta
- -0.33
- P/S
- 8.3x
- P/B
- 1.6x
- Profit margin
- -80.7%
- Op margin
- -1850.0%
- ROE
- -14.4%
What do analysts expect?
Analyst target and ratings are on paid plans
See the 12-month consensus target and the buy/hold/sell rating split.
Unlock the full resultsQuestions about PRTA filings
Are insiders buying or selling Prothena Corporation plc (PRTA) stock?
Net buying: insiders sold $136K and bought $4.2M of PRTA stock on the open market in the 90 days to Oct 1, 2026, according to SEC Form 4 filings. $136K of the sales were made under pre-set Rule 10b5-1 trading plans. The largest was Scully, William P (10% owner), who bought $4.2M. The latest filing was on Sep 30, 2026.
Which members of Congress have traded PRTA recently?
None. No member of Congress disclosed a PRTA trade with a trade date in the last 180 days, according to House and Senate STOCK Act filings.
How current is this PRTA smart-money data?
This summary uses filings available on Oct 1, 2026. Insiders must report trades to the SEC within 2 business days, members of Congress have up to 45 days to disclose a trade, and funds file 13F holdings up to 45 days after each quarter ends, so the latest moves may not be public yet.
Smart money
8 funds hold a position and insiders have been net buying.
What insiders are doing
Buys (3)
- SW
Scully William P
$1.4M
bought
- SW
Scully William P
$890K
bought
- SW
Scully William P
$843K
bought
How top traders are positioned
No tracked top-trader positions in PRTA right now.
Live Hyperliquid positioning - not every stock is covered
Activist stakes, short interest & more
Earnings
Earnings came in 17.9% above what analysts expected.
Earnings per share
-$0.39 expected
Reports Nov 5, 2026, in 35 days
Financials
What it sold, what it cost, what was left.
| USD | Sep 2025 | Dec 2025 | Mar 2026 | Jun 2026 |
|---|---|---|---|---|
| What came in | ||||
| Revenue | $2.4M | $21.0K | $51.1M | $1.0M |
| Cost of what it sold | $28.9M | $942.0K | $918.0K | — |
| Gross profit | -$26.5M | -$921.0K | $50.2M | $1.0M |
| What it spent | ||||
| Research and development | $28.9M | $14.6M | $12.6M | $8.8M |
| Sales and admin | $13.2M | $12.6M | $12.7M | $10.9M |
| Other operating costs | -$28.5M | -$942.0K | -$918.0K | $2.4M |
| Total operating expenses | $13.7M | $26.3M | $24.4M | $22.1M |
| What was left | ||||
| Operating profit | -$40.2M | -$27.2M | $25.8M | -$21.1M |
| Profit before tax | -$36.2M | -$21.6M | $32.7M | -$18.6M |
| Tax | $371.0K | $10.0K | $1.0K | $2.0K |
| Net profit | -$36.5M | -$21.6M | $32.7M | -$18.6M |
| EBITDA | -$35.9M | -$20.6M | $33.6M | -$18.2M |
Technicals
Price structure
This stock is under pressure.
Trend
Under pressure
0 / 100
RSI 14
20D volatility
52-week range
20D support
20D resistance
Returns
Price vs moving averages
Volume pace