PRTA · Prothena Corp Public Ltd Co

Track PRTA — free

$8.86 -0.22 (-2.42%) At close · Aug 14

Market Cap

$454.85M

51.34M

Options Chain

Underlying $8.86 · at close Aug 14, 2026 Options Calculator

Positioning

Aug 21, 2026 · 5 days to expiry · 32 contracts · mixed snapshot sessions · Jul 9, 2026–Aug 12, 2026; 23 unknown

Put / call OI

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dated and unknown snapshot sessions

Open interest

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dated and unknown snapshot sessions

Volume

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dated and unknown snapshot sessions

Chain

Click any strike for greeks, breakeven and the calculator

Expiry

Aug 21 5d Sep 18 33d Dec 18 124d Jan 15 152d Mar 19 215d Jan 21 523d

Calls						Puts
OI	Vol	IV	Δ	Last	Strike	Last	Δ	IV	Vol	OI
0	—	1613.6%	0.982	—		$0.10	—	—	1	1
Call · $1 In the money Snapshot session Unknown Last — Breakeven — Implied vol 1613.6% Delta 0.982 ≈98% ITM Gamma 0.002 Theta -0.073 Vega 0.001 Open interest 0 Model this call Put · $1 Snapshot session Jul 22, 2026 Last $0.10 Breakeven $0.90 Implied vol — Delta — Gamma — Theta — Vega — Open interest 1 Model this put
0	—	913.8%	0.97	—		—	—	—	—	0
Call · $2 In the money Snapshot session Unknown Last — Breakeven — Implied vol 913.8% Delta 0.97 ≈97% ITM Gamma 0.007 Theta -0.061 Vega 0.001 Open interest 0 Model this call Put · $2 Snapshot session Unknown Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this put
0	—	773.9%	0.947	—		—	—	—	—	0
Call · $3 In the money Snapshot session Unknown Last — Breakeven — Implied vol 773.9% Delta 0.947 ≈95% ITM Gamma 0.013 Theta -0.084 Vega 0.001 Open interest 0 Model this call Put · $3 Snapshot session Unknown Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this put
0	—	555.7%	0.934	—		—	—	—	—	0
Call · $4 In the money Snapshot session Unknown Last — Breakeven — Implied vol 555.7% Delta 0.934 ≈93% ITM Gamma 0.021 Theta -0.071 Vega 0.001 Open interest 0 Model this call Put · $4 Snapshot session Unknown Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this put
0	—	427.3%	0.913	—		—	—	—	—	0
Call · $5 In the money Snapshot session Unknown Last — Breakeven — Implied vol 427.3% Delta 0.913 ≈91% ITM Gamma 0.034 Theta -0.068 Vega 0.002 Open interest 0 Model this call Put · $5 Snapshot session Unknown Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this put
0	—	315.7%	0.885	—		—	—	—	—	0
Call · $6 In the money Snapshot session Unknown Last — Breakeven — Implied vol 315.7% Delta 0.885 ≈88% ITM Gamma 0.057 Theta -0.061 Vega 0.002 Open interest 0 Model this call Put · $6 Snapshot session Unknown Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this put
1	1	232.3%	0.834	$1.42		—	-0.182	257.3%	—	0
Call · $7 In the money Snapshot session Aug 4, 2026 Last $1.42 Breakeven $8.42 Implied vol 232.3% Delta 0.834 ≈83% ITM Gamma 0.099 Theta -0.058 Vega 0.003 Open interest 1 Model this call Put · $7 Snapshot session Unknown Last — Breakeven — Implied vol 257.3% Delta -0.182 ≈18% ITM Gamma 0.096 Theta -0.068 Vega 0.003 Open interest 0 Model this put
20	1	142.5%	0.749	$1.00		$0.14	-0.288	188.3%	43	44
Call · $8 In the money Snapshot session Aug 11, 2026 Last $1.00 Breakeven $9.00 Implied vol 142.5% Delta 0.749 ≈75% ITM Gamma 0.206 Theta -0.045 Vega 0.004 Open interest 20 Model this call Put · $8 Snapshot session Aug 6, 2026 Last $0.14 Breakeven $7.86 Implied vol 188.3% Delta -0.288 ≈29% ITM Gamma 0.168 Theta -0.064 Vega 0.004 Open interest 44 Model this put
Underlying $8.86
1.8k	239	70.4%	0.449	$0.34		$0.95	-0.482	182.8%	2	1
Call · $9 Snapshot session Aug 10, 2026 Last $0.34 Breakeven $9.34 Implied vol 70.4% Delta 0.449 ≈45% ITM Gamma 0.516 Theta -0.028 Vega 0.004 Open interest 1.8k Model this call Put · $9 In the money Snapshot session Aug 7, 2026 Last $0.95 Breakeven $8.05 Implied vol 182.8% Delta -0.482 ≈48% ITM Gamma 0.202 Theta -0.072 Vega 0.004 Open interest 1 Model this put
291	5	90.9%	0.151	$0.08		—	—	—	—	0
Call · $10 Snapshot session Aug 12, 2026 Last $0.08 Breakeven $10.08 Implied vol 90.9% Delta 0.151 ≈15% ITM Gamma 0.239 Theta -0.021 Vega 0.003 Open interest 291 Model this call Put · $10 In the money Snapshot session Unknown Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this put
1.7k	3	189%	0.21	$0.10		—	—	—	—	0
Call · $11 Snapshot session Jul 23, 2026 Last $0.10 Breakeven $11.10 Implied vol 189% Delta 0.21 ≈21% ITM Gamma 0.14 Theta -0.054 Vega 0.003 Open interest 1.7k Model this call Put · $11 In the money Snapshot session Unknown Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this put
20	10	183.6%	0.111	$0.17		—	—	—	—	0
Call · $12 Snapshot session Jul 9, 2026 Last $0.17 Breakeven $12.17 Implied vol 183.6% Delta 0.111 ≈11% ITM Gamma 0.094 Theta -0.034 Vega 0.002 Open interest 20 Model this call Put · $12 In the money Snapshot session Unknown Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this put
0	—	229.5%	0.113	—		—	—	—	—	0
Call · $13 Snapshot session Unknown Last — Breakeven — Implied vol 229.5% Delta 0.113 ≈11% ITM Gamma 0.076 Theta -0.043 Vega 0.002 Open interest 0 Model this call Put · $13 In the money Snapshot session Unknown Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this put
0	—	—	—	—		—	—	—	—	0
Call · $14 Snapshot session Unknown Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this call Put · $14 In the money Snapshot session Unknown Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this put
0	—	—	—	—		—	-0.91	285.5%	—	0
Call · $15 Snapshot session Unknown Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this call Put · $15 In the money Snapshot session Unknown Last — Breakeven — Implied vol 285.5% Delta -0.91 ≈91% ITM Gamma 0.053 Theta -0.045 Vega 0.001 Open interest 0 Model this put
0	—	—	—	—		—	—	—	—	0
Call · $16 Snapshot session Unknown Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this call Put · $16 In the money Snapshot session Unknown Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this put

About this data

Each contract's last price, volume, greeks, implied volatility and open interest belongs to the snapshot session shown in its details; unknown means the provider omitted the timestamp. This chain has mixed snapshot sessions · Jul 9, 2026–Aug 12, 2026; 23 unknown. Cross-contract positioning totals are shown only when every returned row has the same known session. Bid and ask are not included on this plan.

In-the-money strikes are tinted, deepening toward the money, and the bar beside each open-interest figure scales to the heaviest strike shown.

Key facts CIK 1559053 CUSIP G72800108 13F (30d) 181 filings 177 filers Visit website Investor relations