OQROSign up free
Insider trade

Prothena Corp Public Ltd (PRTA): 10% owner bought ~$404K

SCULLY WILLIAM P, 10% owner at Prothena Corp Public Ltd, bought ~$404K of Prothena Corp Public Ltd shares.

~$404K
Approx. value · 50K sh @ $8.07
1.19M
Holds after · shares reported
Traded
Oct 23, 2026
Filed
Oct 26, 2026

Context

Written by software from the filings listed below · Oct 26, 2026

  • What was filed. SEC Form 4: SCULLY WILLIAM P, 10% owner, reported an open-market purchase of 50,000 shares at $8.07 each, about $404K. The filing puts the holding after the purchase at 1,187,000 shares.

4 more points, with the facts they come from, are in OQRO Pro.

Sign up free

The story around this disclosure

Every dated public record OQRO holds about the company from 60 days before to 120 days after, oldest first. It shows what was going on; none of it is a stated reason for the trade.

  1. Sep 28, 2026Insider · 4 days before an 8-K10% owner purchased ~$890K of PRTA shares in the open market
  2. Sep 29, 2026Insider · 3 days before an 8-K10% owner purchased ~$1.41M of PRTA shares in the open market
  3. Oct 2, 2026Company filing · Form 8-K · Executive changeChanged a top executive or board member“On October 2, 2026, Chad J. Swanson, Ph.D., Chief Development Officer of Prothena Corporation plc (the “Company”) notified the Company that he is resigning from the Company effective October 9, 2026.”
  4. Oct 2, 2026Insider10% owner purchased ~$857K of PRTA shares in the open market
  5. Oct 7, 2026Insider10% owner purchased ~$1.05M of PRTA shares in the open market
  6. Oct 8, 2026Insider10% owner purchased ~$771K of PRTA shares in the open market
  7. Oct 13, 2026Insider10% owner purchased ~$835K of PRTA shares in the open market
  8. Oct 14, 2026Insider10% owner purchased ~$85K of PRTA shares in the open market
  9. Oct 22, 2026Insider · 14 days before results10% owner purchased ~$819K of PRTA shares in the open market
  10. Oct 23, 2026 · this disclosureInsider · 13 days before results10% owner purchased ~$404K of PRTA shares in the open market

What came next

  1. Oct 28, 2026Company filing · Form 8-K · Agreement endedEnded an important agreement
  2. Nov 5, 2026Company filing · Form 8-K · ResultsReported its results
  3. Nov 9, 2026Insider10% owner purchased ~$1.19M of PRTA shares in the open market
  4. Nov 13, 20265% stakeSCULLY WILLIAM P reported a passive stake (13G) of 12.5%
View the official recordSEC Form 4

How to read SEC Form 4

Form 4 is the filing that officers, directors and owners of more than 10% of a US-listed company must send to the SEC within two business days after they buy, sell or otherwise change their holding of the company's stock.

Full guide: What is an SEC Form 4?

What else is on file for Prothena Corp Public Ltd

For Prothena Corp Public Ltd, OQRO holds 10 insider filings (SEC Form 4 or Form 144) dated in the last 90 days.

These are records OQRO holds, counted by their date, not a measure of how much trading took place. Routine paperwork such as option exercises and tax withholding is left out. Everything for the company is on its PRTA page.

Other recent filings by SCULLY WILLIAM P, 10% owner

The full history of SCULLY WILLIAM P, 10% owner is on the profile page.

How this filing works

Explore the data

Other disclosures at Prothena Corp Public Ltd

Everything OQRO holds on this company is on its PRTA page.

This is one filing. OQRO holds the rest

Insider trades filed with the SEC, stock trades disclosed by members of Congress, fund holdings from 13F filings and federal contract awards, each one in plain words next to its official filing. On this page it opens why the trade stands out, what the company did around that time, the price since, and every field of the form.

Sign up freeAlready have an account? Log in

OQRO is free for everyone. No card, no trial

OQRO describes public disclosures and context calculated from them. It does not give personalized advice and does not recommend any transaction. How OQRO treats data