Stocks › PRTA
PROTHENA CORP PUBLIC LTD CO
PRTA·Nasdaq·
Ireland·USD
Ireland·USD$8.02
-0.25 (-3.02%)
Close · Oct 6, 2026 · Close Prices from Tiingo.com
PRTA
PROTHENA CORP PUBLIC LTD CO · Nasdaq
Nasdaq 100S&P 500
Filings
Default90D1Y5YALL
PRTAS&P 500 (rebased)
Congress BuyCongress SellInsider BuyInsider SellForm 1448-K ResultsLobbying
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Daily closes, adjusted for splits and dividends · Close Prices from Tiingo.comHover a marker, every one is a filing · move across the line for the crosshair
Congressional Trades
Recent trades of PRTA by members of U.S. Congress · 6 on record
| Politician | Stock | Type | Filed | Traded | |
|---|---|---|---|---|---|
 James B. RenacciHouse · R · OH |
PRTAPROTHENA CORP PUBLIC LTD CO · Stock |
Sale $1,001 - $15,000 |
Dec 21, 2017 | Dec 15, 2017 | Filing ↗ |
| James B. RenacciHouse · R · OH |
PRTAPROTHENA CORP PUBLIC LTD CO · Stock |
Purchase $1,001 - $15,000 |
Jan 24, 2017 | Jan 13, 2017 | Filing ↗ |
| James B. RenacciHouse · R · OH |
PRTAPROTHENA CORP PUBLIC LTD CO · Stock |
Sale $1,001 - $15,000 |
Dec 20, 2016 | Dec 13, 2016 | Filing ↗ |
| James B. RenacciHouse · R · OH |
PRTAPROTHENA CORP PUBLIC LTD CO · Stock |
Purchase $1,001 - $15,000 |
Dec 6, 2016 | Nov 17, 2016 | Filing ↗ |
| James B. RenacciHouse · R · OH |
PRTAPROTHENA CORP PUBLIC LTD CO · Stock |
Purchase $1,001 - $15,000 |
Jul 22, 2015 | Jul 1, 2015 | Filing ↗ |
| James B. RenacciHouse · R · OH |
PRTAPROTHENA CORP PUBLIC LTD CO · Stock |
Purchase $1,001 - $15,000 |
Jul 22, 2015 | Jul 1, 2015 | Filing ↗ |
Whale Activity
Position changes in PRTA reported for 2026-06-30 by 1 tracked institutional filer
- Increased0
- New0
- Held0
- Decreased0
- Closed0
- No prior filing1
| Filer | Shares | Value | Change |
|---|---|---|---|
| Palo Alto Investors LP | 1.1M | $11.2M | — |
KeyVex tracks a curated set of large 13F filers plus the largest positions in recent filings, so this is a sample of institutional activity, not the whole market.
Insider Trading
Net shares bought (+) or sold (−) on the open market by PRTA insiders, by quarter · Form 4
Recent Insider Transactions
662 transactions on record · newest first
| Insider | Type | Shares | Price | Value | Date | |
|---|---|---|---|---|---|---|
| SCULLY WILLIAM P | Purchase | +100.0K | $8.57 | $857K | Oct 2, 2026 | Form 4 ↗ |
| SCULLY WILLIAM P | Purchase | +162.0K | $8.68 | $1.4M | Sep 29, 2026 | Form 4 ↗ |
| SCULLY WILLIAM P | Purchase | +103.5K | $8.60 | $890K | Sep 28, 2026 | Form 4 ↗ |
| SCULLY WILLIAM P | Purchase | +100.0K | $8.43 | $843K | Sep 18, 2026 | Form 4 ↗ |
| SCULLY WILLIAM P | Purchase | +27.0K | $9.47 | $256K | Sep 2, 2026 | Form 4 ↗ |
| SCULLY WILLIAM P | Purchase | +50.0K | $8.79 | $439K | Aug 20, 2026 | Form 4 ↗ |
| SCULLY WILLIAM P | Purchase | +3,500 | $8.62 | $30K | Aug 7, 2026 | Form 4 ↗ |
| SCULLY WILLIAM P | Purchase | +34.0K | $8.62 | $293K | Aug 7, 2026 | Form 4 ↗ |
| Kingston Anne EvansChief Strategy Officer | Sale | −7,662 | $8.47 | $65K | Jul 29, 2026 | Form 4 ↗ |
| Isaacs Michael JohnGeneral Counsel & Company Sec. | Sale | −8,386 | $8.47 | $71K | Jul 29, 2026 | Form 4 ↗ |
| SCULLY WILLIAM P10% owner | Purchase | +20.0K | $7.90 | $158K | Jun 16, 2026 | Form 4 ↗ |
| SCULLY WILLIAM P10% owner | Gift | −325.0K | $0.00 | $0 | Jun 15, 2026 | Form 4 ↗ |
| SCULLY WILLIAM P10% owner | Purchase | +125.0K | $8.17 | $1.0M | Jun 11, 2026 | Form 4 ↗ |
| SCULLY WILLIAM P10% owner | Purchase | +50.0K | $9.31 | $466K | Jun 4, 2026 | Form 4 ↗ |
| SCULLY WILLIAM P10% owner | Purchase | +50.0K | $9.43 | $472K | Jun 2, 2026 | Form 4 ↗ |
| SCULLY WILLIAM P10% owner | Purchase | +100.0K | $9.81 | $981K | May 22, 2026 | Form 4 ↗ |
| Zago Wagner M.Chief Scientific Officer | Grant / award | +85.0K | $0.00 | $0 | Jul 28, 2025 | Form 4 ↗ |
| Walker Karin LChief Accounting Officer | Grant / award | +25.0K | $0.00 | $0 | Jul 28, 2025 | Form 4 ↗ |
| Swanson Chad J.Chief Development Officer | Grant / award | +85.0K | $0.00 | $0 | Jul 28, 2025 | Form 4 ↗ |
| Smith Brandon S.Chief Operating Officer | Grant / award | +130.0K | $0.00 | $0 | Jul 28, 2025 | Form 4 ↗ |
Fund Holders
Mutual funds and ETFs holding PRTA · SEC Form N-PORT
| Fund | Shares | Value | % of fund | As of |
|---|---|---|---|---|
| Nuveen Quant Small Cap Equity Fund TIAA-CREF Funds | 652.1K | $7.2M | 0.19% | Apr 30, 2026 |
| VANGUARD EXPLORER FUND | 757.2K | $6.1M | 0.03% | Jul 31, 2026 |
| VANGUARD EXTENDED MARKET INDEX FUND VANGUARD INDEX FUNDS | 480.2K | $4.7M | 0.00% | Jun 30, 2026 |
| VANGUARD STRATEGIC SMALL-CAP EQUITY FUND VANGUARD HORIZON FUNDS | 333.1K | $3.3M | 0.10% | Jun 30, 2026 |
| VANGUARD RUSSELL 2000 INDEX FUND VANGUARD SCOTTSDALE FUNDS | 225.5K | $2.3M | 0.01% | May 31, 2026 |
| Bridge Builder Small/Mid Cap Growth Fund Bridge Builder Trust | 200.1K | $2.0M | 0.02% | Jun 30, 2026 |
| VANGUARD HEALTH CARE INDEX FUND VANGUARD WORLD FUND | 136.6K | $1.4M | 0.01% | May 31, 2026 |
| SMALL COMPANY GROWTH PORTFOLIO VANGUARD VARIABLE INSURANCE FUNDS | 127.6K | $1.2M | 0.07% | Jun 30, 2026 |
| Dimensional U.S. Small Cap ETF Dimensional ETF Trust | 120.8K | $981K | 0.01% | Jul 31, 2026 |
| Avantis U.S. Small Cap Equity ETF American Century ETF Trust | 82.5K | $839K | 0.03% | May 31, 2026 |
Mutual funds and ETFs whose N-PORT filings list PRTA's shares (CUSIP G72800108), each fund at its latest report since Mar 7, 2026, largest positions first. Bonds, options and short positions are left out.
Activist & Passive Stakes
Schedule 13D / 13G beneficial-ownership filings
- Fennell Todd W.SCHEDULE 13G/A · passive (13G) · 5.2M shares10.2%
Aug 19, 2026 · ↗ - Fennell Todd W.SCHEDULE 13G/A · passive (13G) · 5.0M shares9.8%
Aug 14, 2026 · ↗ - Abigail P. JohnsonSCHEDULE 13G/A · passive (13G) · 7.2M shares13.8%
Aug 6, 2026 · ↗ - FMR LLCSCHEDULE 13G/A · passive (13G) · 7.2M shares13.8%
Aug 6, 2026 · ↗ - BlackRock, Inc.SCHEDULE 13G/A · passive (13G) · 3.6M shares6.9%
Jul 29, 2026 · ↗ - David RosenSCHEDULE 13G/A · passive (13G) · 5.0M shares9.3%
May 15, 2026 · ↗ - Rubric Capital Management LPSCHEDULE 13G/A · passive (13G) · 5.0M shares9.3%
May 15, 2026 · ↗ - SCULLY WILLIAM PSCHEDULE 13G/A · passive (13G) · 5.4M shares10.3%
May 11, 2026 · ↗
Corporate Lobbying
Estimated quarterly lobbying spending reported under the LDA, filings naming PROTHENA CORP PUBLIC LTD CO as client
No lobbying filings found naming PROTHENA CORP PUBLIC LTD CO as the client.
Government Contracts
Federal awards to PROTHENA CORP PUBLIC LTD CO · USAspending
No federal contract awards found for PROTHENA CORP PUBLIC LTD CO.
U.S. Patents
Recent USPTO applications naming PROTHENA CORP PUBLIC LTD CO
No USPTO patent applications found for PROTHENA CORP PUBLIC LTD CO.
Annual Financials
From PRTA's 10-K filings · XBRL
No annual XBRL figures on record for PRTA. KeyVex's fundamentals cover about 130 large companies so far.
Stock Splits
Every split and reverse split in the price history
No stock splits in PRTA's price history.
Material Events (8-K)
Corporate events filed with the SEC
About PROTHENA CORP PUBLIC LTD CO
From SEC EDGAR company records
Industry (SIC 2834)Pharmaceutical Preparations
SectorHealthcare
HeadquartersDUBLIN 2, Ireland
IncorporatedL2
SEC CIK0001559053 ↗
Former namesProthena Corp plc, Neotope Corp Ltd