{
 "as_of": "2026-11-08",
 "cmr": "us-cm-kg/NASDAQ/PRTA",
 "fence": "The page is the record's research on the issuer — no analyst, no rating, no view.",
 "markdown": "The page is the record's research on the issuer — no analyst, no rating, no view.\n\n# PROTHENA CORP PUBLIC LTD CO (NASDAQ: PRTA) — research page\n\nAs of 2026-11-08 · us-cm-kg · record version 1\n\n## Identity and listing\n\nThe issuer is PROTHENA CORP PUBLIC LTD CO, listed on NASDAQ under ticker PRTA, with ISIN USG728001086. The LEI is not on the record (no GLEIF record with the exact legal name in jurisdiction US-L2). Its security type is Corporate, its segment is not on the record, its sector is 2834 Pharmaceutical Preparations, and its jurisdiction is Ireland. Status: listed, not halted.\n\n## The disclosure read\n\nThe record holds 79 filings in the twelve months to 2026-11-08, across 42 filing days. By type: 46 directors' dealings, 17 regulatory filings, 8 results, 4 AGM/EGM, 2 director changes, 1 ad hoc and 1 corporate news. The median gap between filing days is 4 days. The latest filing is dated 2026-11-05, 3 days before the record date, and is of type results. The exchange median is 52 filings, a cadence gap of 6.0 days and a latency of 5.0 days across 4359 issuers. The sector median is 63.0 filings, a cadence gap of 6.0 days and a latency of 4.0 days across 526 issuers. The issuer's 79 filings are above the exchange median of 52 and above the sector median of 63.0.\n\n## Auditor\n\nThe auditor is not on the record (no dei:AuditorName tag on the latest annual report cover; foreign private issuers and older filings carry none). Its location is not on the record. The record holds no auditor changes.\n\n## Events and halts\n\nThe record holds no listing, delisting or name change lines. The domicile change is not on the record (EDGAR states no dated change of state of incorporation on a filing line). The segment move is not on the record (the exchanges' tier transfers are not EDGAR filings). The halt flag reads: listed, not halted.\n\n## Orderability\n\nThe outcome is not determinable. The chapter's orderability section carries no client categories, so the outcome cannot name its client category. The rule version is acm-68000/us/reasonable-basis-suitability-finra-rule-2111/r1, and the chapter is as of 2026-11-04.\n\n## Coverage\n\nNo research houses were found on the issuer's own investor-relations page, count 0.\n\n## Open research\n\nNo openly published research notes were found, count 0.\n\n## Licensed\n\nLicensed research: none loaded. A licensed row is served only to an agent whose firm holds that licence (licensor, entitlement). No licensed row is loaded.\n\n## As-of depth\n\nThe issuer's years sealed are 2021, 2022, 2023, 2024, 2025 and 2026. The market's earliest sealed date is 2021-01-04. The live record began on 2026-09-12. The market's vintage is sealed.\n\n## Sources\n\n7 source pages are named on this page; every value above carries its own source page and read date in the numbers.\n\n- https://www.sec.gov/files/company_tickers_exchange.json (identity.exchange)\n- https://www.sec.gov/data-research/sec-markets-data/fails-deliver-data (identity.isin)\n- https://data.sec.gov/submissions/CIK0001559053.json (identity.jurisdiction)\n- https://mcp.us-cm-kg.ai/events/NASDAQ/PRTA (the disclosure lines)\n- https://www.nasdaqtrader.com/rss.aspx?feed=tradehalts (the halt flag)\n- https://mcp.us-cm-kg.ai/book/aio.json (the orderability chapter)\n- https://mcp.us-cm-kg.ai/record/NASDAQ/PRTA (the record)\n",
 "market": "US",
 "node": "us-cm-kg",
 "numbers": {
  "as_of_depth": {
   "issuer_years_sealed": [
    "2021",
    "2022",
    "2023",
    "2024",
    "2025",
    "2026"
   ],
   "live_record_began": "2026-09-12",
   "node_history_from": "2021-01-04",
   "node_years_sealed": [
    "2021",
    "2022",
    "2023",
    "2024",
    "2025",
    "2026"
   ],
   "record_version": 1,
   "sealed": true
  },
  "auditor": {
   "auditor": {
    "market": "US",
    "reason": "no dei:AuditorName tag on the latest annual report cover (foreign private issuers and older filings carry none)",
    "state": "not_on_record"
   },
   "auditor_firm_id": {
    "market": "US",
    "state": "not_on_record"
   },
   "auditor_location": {
    "market": "US",
    "state": "not_on_record"
   },
   "changes": []
  },
  "cmr": "us-cm-kg/NASDAQ/PRTA",
  "coverage": {
   "count": 0,
   "houses": [],
   "pages_checked": [],
   "read_by": "Perplexity sonar (search) · page read by this rail",
   "read_date": "2026-11-11",
   "since": null,
   "state": "none_found"
  },
  "disclosure": {
   "against": {
    "exchange": {
     "issuers": 4359,
     "median_cadence_gap_days": 6,
     "median_filings": 52,
     "median_latency_days": 5,
     "name": "NASDAQ"
    },
    "sector": {
     "issuers": 526,
     "median_cadence_gap_days": 6,
     "median_filings": 63,
     "median_latency_days": 4,
     "name": "2834 Pharmaceutical Preparations"
    }
   },
   "by_type": {
    "ad_hoc": 1,
    "agm_egm": 4,
    "corporate_news": 1,
    "director_change": 2,
    "directors_dealings": 46,
    "regulatory_filing": 17,
    "results": 8
   },
   "cadence_median_gap_days": 4,
   "filing_days": 42,
   "filings": 79,
   "latency_days": 3,
   "latest": [
    {
     "category": "10-Q",
     "date": "2026-11-05",
     "source": "https://www.sec.gov/Archives/edgar/data/1559053/000155905326000031/prta-20260930.htm",
     "title": "10-Q — 10-Q",
     "type": "results"
    },
    {
     "category": "8-K",
     "date": "2026-11-05",
     "source": "https://www.sec.gov/Archives/edgar/data/1559053/000155905326000030/prta-20261105.htm",
     "title": "8-K — 8-K (items 2.02,9.01)",
     "type": "results"
    },
    {
     "category": "8-K",
     "date": "2026-10-29",
     "source": "https://www.sec.gov/Archives/edgar/data/1559053/000155905326000026/prta-20261028.htm",
     "title": "8-K — 8-K (items 1.02,9.01)",
     "type": "ad_hoc"
    },
    {
     "category": "4",
     "date": "2026-10-29",
     "source": "https://www.sec.gov/Archives/edgar/data/1559053/000104546326000023/xslF345X06/primary_doc.xml",
     "title": "4 — PRIMARY DOCUMENT",
     "type": "directors_dealings"
    },
    {
     "category": "4",
     "date": "2026-10-26",
     "source": "https://www.sec.gov/Archives/edgar/data/1559053/000104546326000022/xslF345X06/primary_doc.xml",
     "title": "4 — PRIMARY DOCUMENT",
     "type": "directors_dealings"
    }
   ],
   "latest_filing_date": "2026-11-05",
   "read": "the node's event lines (list_events_since), as get_filings serves them",
   "source": "https://mcp.us-cm-kg.ai/events/NASDAQ/PRTA",
   "window": {
    "from": "2025-11-08",
    "to": "2026-11-08"
   }
  },
  "identity": {
   "exchange": {
    "read_by": "EDGAR company_tickers_exchange.json (SEC list of exchange-listed filers)",
    "read_date": "2026-11-08",
    "read_date_basis": "the record version as_of",
    "source": "https://www.sec.gov/files/company_tickers_exchange.json",
    "state": "sourced",
    "value": "NASDAQ"
   },
   "isin": {
    "read_by": "SEC Fails-to-Deliver data (CUSIP for the symbol) · ISIN = US + CUSIP + ISO 6166 check digit",
    "read_date": "2026-09-29",
    "read_date_basis": "last_seen",
    "source": "https://www.sec.gov/data-research/sec-markets-data/fails-deliver-data",
    "state": "sourced",
    "value": "USG728001086"
   },
   "jurisdiction": {
    "read_by": "EDGAR submissions API (issuer header as filed) (stateOfIncorporation)",
    "read_date": "2026-11-08",
    "read_date_basis": "the record version as_of",
    "source": "https://data.sec.gov/submissions/CIK0001559053.json",
    "state": "sourced",
    "value": "Ireland"
   },
   "lei": {
    "market": "US",
    "reason": "no GLEIF record with the exact legal name in jurisdiction US-L2",
    "state": "not_on_record"
   },
   "name": {
    "read_by": "EDGAR submissions API (issuer header as filed)",
    "read_date": "2026-11-08",
    "read_date_basis": "the record version as_of",
    "source": "https://data.sec.gov/submissions/CIK0001559053.json",
    "state": "sourced",
    "value": "PROTHENA CORP PUBLIC LTD CO"
   },
   "sector": {
    "read_by": "EDGAR submissions API (issuer header as filed) (SIC code as assigned by the SEC)",
    "read_date": "2026-11-08",
    "read_date_basis": "the record version as_of",
    "source": "https://data.sec.gov/submissions/CIK0001559053.json",
    "state": "sourced",
    "value": "2834 Pharmaceutical Preparations"
   },
   "security_type": {
    "read_by": "EDGAR submissions API (issuer header as filed)",
    "read_date": "2026-11-08",
    "read_date_basis": "the record version as_of",
    "source": "https://data.sec.gov/submissions/CIK0001559053.json",
    "state": "sourced",
    "value": "Corporate"
   },
   "segment": {
    "market": "US",
    "state": "not_on_record"
   },
   "ticker": {
    "read_by": "EDGAR company_tickers_exchange.json (SEC list of exchange-listed filers)",
    "read_date": "2026-11-08",
    "read_date_basis": "the record version as_of",
    "source": "https://www.sec.gov/files/company_tickers_exchange.json",
    "state": "sourced",
    "value": "PRTA"
   },
   "website": {
    "market": "US",
    "state": "not_on_record"
   }
  },
  "licensed": {
   "columns": [
    "licensor",
    "entitlement",
    "title",
    "date",
    "source"
   ],
   "rows": [],
   "rule": "A licensed row is served only to an agent whose firm holds that licence (licensor, entitlement). No licensed row is loaded."
  },
  "lifecycle": {
   "delisting": [],
   "domicile_change": {
    "market": "US",
    "reason": "EDGAR states no dated change of state of incorporation on a filing line",
    "state": "not_on_record"
   },
   "listing": [],
   "name_change": [],
   "segment_move": {
    "market": "US",
    "reason": "the exchanges' tier transfers are not EDGAR filings",
    "state": "not_on_record"
   }
  },
  "market": "US",
  "node": "us-cm-kg",
  "numbers_hash": "sha256:abed6a68de72a26d42d598a8bbfbe66a6f98350aff8ac166f5b841f1d8bf6ce9",
  "open_research": {
   "read_date": "2026-11-11",
   "rows": [],
   "state": "none_found"
  },
  "orderability": {
   "chapter_as_of": "2026-11-04",
   "client_categories": [],
   "determinable": false,
   "read": {
    "chapter": "https://mcp.us-cm-kg.ai/book/aio.json",
    "door": "https://mcp.us-cm-kg.ai/mcp",
    "tool": "get_orderability"
   },
   "reason": "the chapter's orderability section carries no client_categories: the outcome cannot name its client category",
   "rule_version": "acm-68000/us/reasonable-basis-suitability-finra-rule-2111/r1",
   "section": "us.aio.v8"
  },
  "record": {
   "as_of": "2026-11-08",
   "url": "https://mcp.us-cm-kg.ai/record/NASDAQ/PRTA",
   "version": 1
  },
  "schema": "research-numbers v0.1 (USR-01, 2026-11-11)",
  "status": {
   "read_date": "2026-11-08",
   "source": "https://www.nasdaqtrader.com/rss.aspx?feed=tradehalts",
   "value": "listed, not halted"
  }
 },
 "numbers_hash": "sha256:abed6a68de72a26d42d598a8bbfbe66a6f98350aff8ac166f5b841f1d8bf6ce9",
 "path": "/us/NASDAQ/PRTA",
 "schema": "research-page v0.1 (USR-02, 2026-11-11)",
 "sections": [
  {
   "id": "identity",
   "text": "The issuer is PROTHENA CORP PUBLIC LTD CO, listed on NASDAQ under ticker PRTA, with ISIN USG728001086. The LEI is not on the record (no GLEIF record with the exact legal name in jurisdiction US-L2). Its security type is Corporate, its segment is not on the record, its sector is 2834 Pharmaceutical Preparations, and its jurisdiction is Ireland. Status: listed, not halted.",
   "title": "Identity and listing"
  },
  {
   "id": "disclosure",
   "text": "The record holds 79 filings in the twelve months to 2026-11-08, across 42 filing days. By type: 46 directors' dealings, 17 regulatory filings, 8 results, 4 AGM/EGM, 2 director changes, 1 ad hoc and 1 corporate news. The median gap between filing days is 4 days. The latest filing is dated 2026-11-05, 3 days before the record date, and is of type results. The exchange median is 52 filings, a cadence gap of 6.0 days and a latency of 5.0 days across 4359 issuers. The sector median is 63.0 filings, a cadence gap of 6.0 days and a latency of 4.0 days across 526 issuers. The issuer's 79 filings are above the exchange median of 52 and above the sector median of 63.0.",
   "title": "The disclosure read"
  },
  {
   "id": "auditor",
   "text": "The auditor is not on the record (no dei:AuditorName tag on the latest annual report cover; foreign private issuers and older filings carry none). Its location is not on the record. The record holds no auditor changes.",
   "title": "Auditor"
  },
  {
   "id": "events",
   "text": "The record holds no listing, delisting or name change lines. The domicile change is not on the record (EDGAR states no dated change of state of incorporation on a filing line). The segment move is not on the record (the exchanges' tier transfers are not EDGAR filings). The halt flag reads: listed, not halted.",
   "title": "Events and halts"
  },
  {
   "id": "orderability",
   "text": "The outcome is not determinable. The chapter's orderability section carries no client categories, so the outcome cannot name its client category. The rule version is acm-68000/us/reasonable-basis-suitability-finra-rule-2111/r1, and the chapter is as of 2026-11-04.",
   "title": "Orderability"
  },
  {
   "id": "coverage",
   "text": "No research houses were found on the issuer's own investor-relations page, count 0.",
   "title": "Coverage"
  },
  {
   "id": "open_research",
   "text": "No openly published research notes were found, count 0.",
   "title": "Open research"
  },
  {
   "id": "licensed",
   "text": "Licensed research: none loaded. A licensed row is served only to an agent whose firm holds that licence (licensor, entitlement). No licensed row is loaded.",
   "title": "Licensed"
  },
  {
   "id": "depth",
   "text": "The issuer's years sealed are 2021, 2022, 2023, 2024, 2025 and 2026. The market's earliest sealed date is 2021-01-04. The live record began on 2026-09-12. The market's vintage is sealed.",
   "title": "As-of depth"
  },
  {
   "id": "sources",
   "text": "7 source pages are named on this page; every value above carries its own source page and read date in the numbers.",
   "title": "Sources"
  }
 ],
 "sources": [
  {
   "for": "identity.exchange",
   "source": "https://www.sec.gov/files/company_tickers_exchange.json"
  },
  {
   "for": "identity.isin",
   "source": "https://www.sec.gov/data-research/sec-markets-data/fails-deliver-data"
  },
  {
   "for": "identity.jurisdiction",
   "source": "https://data.sec.gov/submissions/CIK0001559053.json"
  },
  {
   "for": "the disclosure lines",
   "source": "https://mcp.us-cm-kg.ai/events/NASDAQ/PRTA"
  },
  {
   "for": "the halt flag",
   "source": "https://www.nasdaqtrader.com/rss.aspx?feed=tradehalts"
  },
  {
   "for": "the orderability chapter",
   "source": "https://mcp.us-cm-kg.ai/book/aio.json"
  },
  {
   "for": "the record",
   "source": "https://mcp.us-cm-kg.ai/record/NASDAQ/PRTA"
  }
 ],
 "title": "PROTHENA CORP PUBLIC LTD CO (PRTA) — research page",
 "writer": {
  "by": "Claude through the platform account, Haiku class; one pass; checked against the numbers",
  "engine": "claude-haiku-5-5"
 }
}