Prothena Corporation plc
GB ˙ LSE ˙ IE00B91XRN20
9,22 $ ↑0,32 (3,60%)
2026-06-04
AKTIENPREIS
SecurityGB:0Y3M / Prothena Corporation plc
InstitutionCreative Planning
Latest Disclosed Ownership72,986 shares
Latest Disclosed Value $ 709,424
Creative Planning ownership in 0Y3M / Prothena Corporation plc

On May 12, 2026 - Creative Planning filed a 13F-HR form disclosing ownership of 72,986 shares of Prothena Corporation plc (GB:0Y3M) valued at $708,898 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 61,969 shares of Prothena Corporation plc. This represents a change in shares of 17.78% during the quarter. The current value of the position is $672,566 USD.

Creative Planning has a history of taking positions in derivatives of the underlying security (0Y3M) in the form of stock options.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

Upgrade to unlock premium data and export to Excel .

Institutional Put/Call Ratios
(Premium Subscription Required)

In addition to reporting standard equity and debt issues, institutions with more than 100MM assets under management must also disclose their put and call option holdings. Since put options generally indicate negative sentiment, and call options indicate positive sentiment, we can get a sense of the overall institutional sentiment by plotting the ratio of puts to calls. The chart to the right plots the historical put/call ratio for this instrument.

Using Put/Call Ratio as an indicator of investor sentiment overcomes one of the key deficiencies of using total institutional ownership, which is that a significant amount of assets under management are invested passively to track indices. Passively-managed funds do not typically buy options, so the put/call ratio indicator more closely tracks the sentiment of actively-managed funds.

GB:0Y3M / Prothena Corporation plc Historical Put/Call Ratio
Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date
Effective
Date
Form Security Class ID Avg Price
Paid (Est)
Reported
Shares
ΔShares ΔShares
(%)
Reported
Value
(x1000)
ΔValue
(%)
Alloc
(%)
ΔAlloc ΔAlloc (%) Cost Basis
(x1000)
Unrealized
Gain/Loss
(x1000)
2026-05-12 2026-03-31 13F PROTHENA CORP SHS G72800108 72,986 11,017 17.78 709 19.97 0.0005
2026-02-17 2025-12-31 13F PROTHENA CORP SHS G72800108 61,969 -2,171 -3.38 592 -5.59 0.0004
2025-11-14 2025-09-30 13F PROTHENA CORP SHS G72800108 64,140 13,571 26.84 626 104.58 0.0005
2025-08-08 2025-06-30 13F PROTHENA CORP SHS G72800108 50,569 39,879 373.05 307 131.82 0.0003
2025-05-15 2025-03-31 13F PROTHENA CORP SHS G72800108 10,690 -5,371 -33.44 132 -40.54 0.0001
2025-02-14 2024-12-31 13F PROTHENA CORP SHS G72800108 16,061 -4,846 -23.18 222 -36.39 0.0002
2024-10-11 2024-09-30 13F PROTHENA CORP SHS G72800108 20,907 20,907 350 0.0003
2024-08-15 2024-06-30 13F PROTHENA CORP SHS G72800108 0 -8,260 -100.00 0 -100.00
2024-05-13 2024-03-31 13F PROTHENA CORP SHS G72800108 8,260 8,260 205 0.0002
2017-10-17 2017-09-30 13F PROTHENA CORP SHS G72800108 0 -1,718 -100.00 0 -100.00
2017-07-12 2017-06-30 13F PROTHENA CORP SHS G72800108 1,718 417 32.05 93 27.40 0.0005
2017-04-07 2017-03-31 13F PROTHENA CORP SHS G72800108 1,301 2 0.15 73 14.06 0.0004
2017-01-09 2016-12-31 13F PROTHENA CORP SHS G72800108 1,299 29 2.28 64 -15.79 0.0004
2016-10-12 2016-09-30 13F PROTHENA CORP SHS G72800108 1,270 -2 -0.16 76 72.73 0.0005
2016-07-12 2016-06-30 13F PROTHENA CORP SHS G72800108 1,272 -112 -8.09 44 -22.81 0.0003
2016-04-08 2016-03-31 13F PROTHENA CORP SHS G72800108 1,384 -104 -6.99 57 -44.12 0.0004
2016-01-11 2015-12-31 13F PROTHENA CORP SHS G72800108 1,488 1,201 418.47 102 684.62 0.0008
2015-10-09 2015-09-30 13F PROTHENA CORP SHS G72800108 287 287 0.00 13 0.0001
2015-07-09 2015-06-30 13F PROTHENA CORP SHS G72800108 0 -215 -100.00 0 -100.00
2015-04-13 2015-03-31 13F PROTHENA CORP SHS G72800108 215 215 0.00 8 0.0001
2015-01-29 2014-12-31 13F PROTHENA CORP SHS G72800108 0 -200 -100.00 0 -100.00
2014-10-10 2014-09-30 13F PROTHENA CORP SHS G72800108 200 -1 -0.50 4 -20.00 0.0000
2014-08-20 2014-06-30 13F PROTHENA CORP SHS G72800108 201 -243 -54.73 5 -70.59 0.0001
2014-04-11 2014-03-31 13F PROTHENA CORP SHS G72800108 444 243 120.90 17 240.00 0.0003
2014-01-06 2013-12-31 13F PROTHENA CORP SHS G72800108 201 -54 -21.18 5 0.00 0.0001
2013-10-10 2013-09-30 13F PROTHENA CORP SHS G72800108 255 14 5.81 5 66.67 0.0001
2013-07-09 2013-06-30 13F PROTHENA CORP SHS G72800108 241 241 3 0.0001
Disclosed Put Options
File
Date
Effective
Date
Form Security Class ID Opt Avg Share Price Shares ΔShares
(%)
Value
(x1000)
ΔValue
(%)
Prior Allocation
(%)
Allocation
(%)
ΔAllocation
(%)
Cost Basis
(x1000)
Profit
(x1000)
Return
(%)
2016-07-12 2016-06-30 13F PROTHENA CORP SHS Put 0 -100.00 0 n/a n/a n/a
2016-04-08 2016-03-31 13F PROTHENA CORP SHS Put 100 0 n/a n/a n/a
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.