Prothena Corporation plc (PRTA) — 13F Holders Deep Dive (Q2 2026)

PRTA ranks #3109 out of 37696 tracked stocks by institutional interest — one of the most closely watched names in our coverage.

192 institutions disclose a position in PRTA, but none treat it as a major bet — even Rangeley Capital, LLC, its most concentrated holder, allocates just 3.7% of its own portfolio to it.

Farther Finance Advisors, LLC has trimmed its PRTA position for two straight quarters, cutting it by $4.1K while still holding $23.3K.

PRTA is up 2.7% today, and institutions have been net buyers of $25.9M this quarter — today's price move and the underlying institutional flow are pointing the same direction.

PRTA reported a net loss of $44.0M over the trailing twelve months.

• Not yet profitable — net loss of $44.0M over the trailing twelve months
• Revenue grew 427.3% year over year
• Net income improved year over year, from -$302.9M to -$44.0M
• Operating cash flow was negative, using $163.6M in cash
• Current ratio of 7.72x — enough short-term assets to cover short-term liabilities
• Liabilities run 0.17x equity — within a conventional range