William Scully buys 90,000 shares in Prothena stock

Published on 10/15/2026 at 14:04 | Editorial responsibility: Rafael Müller, Editor-in-Chief AD HOC NEWS

Prothena posted USD 1.01 million in second-quarter revenue versus USD 0.42 million consensus. Prothena stock costs EUR 7.39 on October 15, 2026.

Insider ownership and reporting calendar

William Scully acquired 90,000 Prothena shares in a transaction dated October 8, 2026.
Second-quarter revenue reached USD 1.01 million against USD 0.42 million consensus.
Prothena stock trades at EUR 7.39 at 2:00 p.m. CEST at Lang & Schwarz on October 15, 2026.

PRTA, IE00B91XRN20, Illustration mit AI erstellt.

Prothena (ISIN IE00B91XRN20) drew attention after major shareholder William Scully acquired 90,000 shares in a transaction dated October 8, 2026. MarketBeat reported that the purchase increased his direct ownership by 20.50 percent to 529,000 shares.

Three events shape the picture

On August 6, 2026, Prothena reported a second-quarter adjusted loss of USD 0.32 per share, compared with a consensus loss of USD 0.39 per share, while revenue reached USD 1.01 million against USD 0.42 million expected. MarketBeat carried those quarterly figures. On October 2, 2026, Chief Development Officer Chad J. Swanson notified Prothena of his resignation effective October 9, 2026, according to a filing with the SEC. The October 8 purchase was the latest of the three dated events.

What does the trade signal?

The purchase gives investors a concrete ownership figure, but it does not change Prothena's clinical-stage profile. The company describes its work as focused on protein dysregulation and investigational therapies for neurodegenerative and rare peripheral amyloid diseases, according to its investor-relations overview. The latest quarterly numbers also show the contrast: revenue exceeded consensus by USD 0.59 million, while the company remained loss-making.

The next dated item is Prothena's estimated third-quarter reporting date of November 5, 2026. MarketBeat lists the announcement after the market close, with a conference call scheduled for 4:00 p.m. ET.

Stock price and reporting date

At 2:00 p.m. CEST on October 15, 2026, Prothena stock was trading at EUR 7.39 at Lang & Schwarz. The upcoming November 5 reporting date puts the next earnings release ahead of the company's latest quarterly revenue comparison.

The further course of trading is shown by the continuously updated real-time quote of Prothena stock.