Stock Analysis
Data Source: SEC EDGAR 13F
Updated Hourly

Prothena Corp plc (PRTA)

182 + Investors. Track Smart Money conviction in PRTA. See who's accumulating, reducing, or initiating positions.

Current Price
-- USD
Analyst Target
-- (0 analysts)
Upside
0.00%
Net Flow Q/Q
↑ +3
Streak
1Q ▲
Buyers last Q
56%

Smart Money Signals — PRTA

Based on 184 hedge funds · latest filing: 2026 Q1 · updated quarterly

📈

Buying streak — 1 quarter in a row

last 6Q
For 1 consecutive quarter, more hedge funds added PRTA than sold it. That's a consistent pattern of professional buying — not a one-time trade. When institutions keep buying quarter after quarter, it usually means they see a multi-year opportunity, not just a short-term momentum flip.
🏔️

At the ownership peak (97% of max)

97% of all-time peak
184 hedge funds hold PRTA right now — the highest count in 3.0 years. When ownership is this concentrated, any bad news can trigger a chain reaction: one big fund sells, others follow. This is a classic 'crowded trade' — high popularity doesn't equal safety.
📶

Steady growth — +14% more funds vs a year ago

fund count last 6Q
+22 new funds entered over the past year (+14% YoY). Gradual, steady growth in institutional ownership is generally a healthy signal — not a speculative rush, but consistent conviction.
🟡

Slight buying edge — 56% buying

100 buying77 selling
Last quarter: 100 funds bought or added vs 77 that reduced or exited. It's nearly a 50/50 split — some institutions are convinced, others are taking profits. This mixed picture is normal near price highs.
➡️

Steady new buyers — ~29 new funds per quarter

new funds entering per quarter
Funds opening this position for the first time: 54 → 34 → 24 → 29. A stable flow of new institutional buyers suggests ongoing interest without signs of either acceleration or slowdown.
🔒

57% of holders stayed for 2+ years

■ 57% conviction (2yr+) ■ 24% medium ■ 18% new
105 out of 184 hedge funds have held PRTA for over 2 years without selling. Long-term investors are generally harder to shake out during market stress, creating a stable ownership base that limits the risk of sudden capitulation.
📊

Peak discovery — momentum slowing

20 → 54 → 34 → 24 → 29 new funds/Q
New funds entering each quarter: 54 → 34 → 24 → 29. PRTA is well-known in the hedge fund world, but fresh entries are gradually declining. The explosive phase of institutional discovery is likely behind us.
🏛️

Veteran-anchored — 65% veterans vs 23% newcomers

■ 65% veterans ■ 13% 1-2yr ■ 23% new
Entry-cohort mix of 191 holders: 124 (65%) are 2+ year veterans, 24 entered 1–2 years ago, and 43 (23%) joined within the past year. A veteran-weighted cap table skews toward institutional memory over fresh momentum.
🏆

Elite ownership — 41% AUM from top-100 funds

41% from top-100 AUM funds
39 of 183 holders are among the 100 largest funds by AUM, controlling 41% of total institutional value in PRTA. When the biggest players dominate the cap table, it signifies deep institutional support — since mega-funds deploy the most rigorous due diligence and capital.
3.3
out of 10
Low Exit Risk
Exit risk score 3.3/10 — low institutional crowding. Ownership is below peak levels, holder base is relatively sticky, and buying momentum is positive.

Methodology note: these Smart Money cards use consecutive 13F disclosure snapshots, not trade-by-trade execution data. "Buying", "selling", "new holders", and "trimmed" refer to quarter-over-quarter changes in reported holders, aggregate shares, or disclosed position values between filings. They are useful for ownership regime analysis and crowding, but they do not imply exact trade timing on the filing date.

Institutional Sentiment Summary — PRTA

In 2026 Q1, 100 hedge funds were net buyers of PRTA (29 opened a new position, 71 added to an existing one), while 77 reduced or exited (51 trimmed, 26 sold completely) — a 56% buyer ratio, indicating a slight buying edge. 41% of total institutional value in PRTA is held by top-100 AUM funds, reflecting elite-tier ownership quality. Net fund flow last quarter: +3 funds (more new holders than closures). Total institutional holders: 184.

Hedge Fund Ownership: PRTA

How many hedge funds hold PRTA — quarterly history vs. share price
Quarterly hedge fund ownership of PRTA vs. share price

Market Analysis: PRTA

Analyst Price Targets

Avg. Price Target
--

Analyst Recommendations

Stock Performance

Real-time

Company Profile: PRTA

-- --

Institutional ownership data sourced from SEC EDGAR Form 13F-HR filings.

Is It Too Late to Buy Prothena Corp plc (PRTA) Based on Hedge Fund 13F Filings?

Signal Freshness measures how much PRTA has moved relative to its sector benchmark (XLV) since the 2026 Q1 13F filing. A stock that has barely outrun its sector is still a relatively fresh entry point — the fund's thesis has not yet been priced in by the broader market.

Since Quarter End March 31, 2026 · 82d ago
PRTA
nan%
XLV
+1.9%

PRTA outperformed XLV by nan% since March 31, 2026.

Since 13F Filing Date May 15, 2026 · 37d ago
PRTA
nan%
XLV
+3.0%

Since the filing became public, PRTA outperformed XLV by nan% .

Interpretation: The stock is tracking its sector benchmark closely. The signal remains fresh and the entry point is still near the fund's implied reference. Learn more →

Smart Money Signal ?
Limited Smart Money Interest

No strong consensus or elite conviction detected among institutional holders.

18 top-rated funds 1 high-conviction
Consensus
5.6
/ 10
breadth
×
Elite
1.5
/ 10
conviction
Hedge Fund Positioning: PRTA
182 + Investors

Track Smart Money conviction in PRTA. See who's accumulating, reducing, or initiating positions.

Metric All 13F Filers (2026 Q1) Prior (2025 Q4) Change
Funds Holding 182 181 0.55%
13F Shares 48M 49M -1.35%
Total Value $451M $463M -2.54%
New Positions 28 24 +4
Increased Positions 67 62 +5
Closed Positions 27 32 -5
Reduced Positions 50 58 -8
Total Calls 5 7 -28.57%
Total Puts 3 7 -57.14%
PUT/CALL Ratio 0.6 1.0 Bullish

Statistics: PRTA

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Beta (5Y Monthly) --
Short Ratio (Days to Cover) --
Short % of Float --

Financial Highlights

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Institutional Holders (2026 Q1)

182 + investors

Explore institutional interest and hedge fund ownership dynamics. Analyze portfolio weights, new positions, and conviction trends in PRTA. Verified SEC 13F-HR filings.

QUARTER:
Top 25 PRTA holders by conviction (% of portfolio weight) — 2026 Q1 · Source: SEC Form 13F
# Investor % of Portfolio Shares Mkt Value
1 Rangeley Capital, LLC 4.24% 449,460 $4.4M
2 Birchview Capital, LP 2.48% 449,019 $4.4M
3 Penbrook Management LLC 2.00% 271,720 $2.6M
4 Palo Alto Investors LP 1.80% 1,208,568 $11.7M
5 Monimus Capital Management, LP 1.31% 485,617 $4.7M
6 ADAR1 Capital Management, LLC 0.90% 1,581,443 $15.4M
7 Rubric Capital Management LP 0.51% 5,000,000 $48.6M
8 Focused Wealth Management, Inc 0.21% 207,403 $2.0M
9 DCF Advisers, LLC 0.19% 73,247 $712K
10 Duncan Williams Asset Management, LLC 0.19% 70,281 $683K
11 Seven Fleet Capital Management LP 0.13% 43,300 $421K
12 Foundation Wealth Management, LLC 0.13% 19,236 $187K
13 Purkiss Capital Advisors LLC 0.11% 25,086 $244K
14 Campbell & CO Investment Adviser LLC 0.08% 142,587 $1.4M
15 Armistice Capital, LLC 0.08% 439,411 $4.3M
16 Virtus Investment Advisers, LLC 0.07% 26,320 $256K
17 Fox Run Management, L.L.C. 0.06% 35,052 $324K
18 Jacobs Levy Equity Management, Inc 0.04% 972,017 $9.4M
19 Hennion & Walsh Asset Management, Inc. 0.03% 88,544 $861K
20 Quinn Opportunity Partners LLC 0.03% 50,000 $486K
21 CHICAGO TRUST Co NA 0.02% 15,057 $146K
22 Y-Intercept (Hong Kong) Ltd 0.02% 100,805 $980K
23 Martingale Asset Management L P 0.02% 69,101 $672K
24 Federated Hermes, INC. 0.02% 1,059,849 $10.3M
25 XTX Topco Ltd 0.02% 92,326 $897K
Investor Ownership
History 		% of Portfolio Prev % Rank Conviction Avg Buy Price 13F Score™ 3Y / 7Y Sell Timing Shares Mkt Value Change Change % Source Quarter Filed

Frequently Asked Questions — Prothena Corp plc (PRTA)

What does the Smart Money Trend signal show for PRTA?

Buying streak — 1 quarter in a row: For 1 consecutive quarter, more hedge funds added PRTA than sold it. That's a consistent pattern of professional buying — not a one-time trade. When institutions keep buying quarter after quarter, it usually means they see a multi-year opportunity, not just a short-term momentum flip.

What is the institutional breadth score for PRTA?

Slight buying edge — 56% buying: Last quarter: 100 funds bought or added vs 77 that reduced or exited. It's nearly a 50/50 split — some institutions are convinced, others are taking profits. This mixed picture is normal near price highs.

What is the fund quality score for PRTA holders?

Elite ownership — 41% AUM from top-100 funds: 39 of 183 holders are among the 100 largest funds by AUM, controlling 41% of total institutional value in PRTA. When the biggest players dominate the cap table, it signifies deep institutional support — since mega-funds deploy the most rigorous due diligence and capital.

How long have hedge funds held PRTA?

57% of holders stayed for 2+ years: 105 out of 184 hedge funds have held PRTA for over 2 years without selling. Long-term investors are generally harder to shake out during market stress, creating a stable ownership base that limits the risk of sudden capitulation.

Is it too late to buy Prothena Corp plc (PRTA) following the 2026 Q1 hedge fund 13F filings?

As of today, PRTA has moved nan% since the 2026 Q1 13F filing date (May 15, 2026), compared to +3.0% for the XLV sector ETF — an outperformance of nan%. Since the quarter end (March 31, 2026), PRTA has gained nan% vs +1.9% for XLV. The stock is tracking its sector benchmark closely. The signal remains fresh and the entry point is still near the fund's implied reference.

Where does this institutional ownership data come from?

All holdings data is sourced from SEC Form 13F filings, which institutional investment managers with over $100 million in assets are required to submit quarterly. Data is parsed directly from SEC EDGAR.

Disclaimer: The information on this page is for informational purposes only and does not constitute investment advice, a recommendation, or an offer to buy or sell any security. Institutional holdings data is sourced from SEC Form 13F filings and reflects positions as of the filing date. Past performance of any fund or portfolio is not indicative of future results. 13Foresight is not a registered investment adviser. Always conduct your own due diligence before making investment decisions.

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