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Who

William P. Scully

10% owner

Company insider

Files Form 4 as: 10% owner, Prothena Corporation; 10% owner, Metabolix.

Every Form 4 they filed

In numbers

Trades disclosed
66
Buys
30
Sells
4
Bought
$21.5M
Sold
$81K
Companies
2
Companies where not an officer
2
First trade
30 Oct 2014
Last trade
14 Oct 2026
Last filed
15 Oct 2026

Companies traded

Everywhere else they filed: board seats, 10% stakes, other companies
PRTA Prothena Corporation10% owner · Biotechnology · last 14 Oct 202620 buys · 0 sells
Metabolix10% owner · last 13 Sep 201610 buys · 4 sells

Activity over time

1 Nov 2024 – 1 Oct 2026
04Nov 24May 25Nov 25Apr 26Oct 26

Buys above the line, sells below, each month.

Every trade

TradedCompanyWhatAmount
14 Oct 2026filed 15 Oct 2026PRTA Prothena CorporationBiotechnologySEC FORM 4 Bought$85K10,000 at $8.46filing
13 Oct 2026filed 15 Oct 2026PRTA Prothena CorporationBiotechnologySEC FORM 4 Bought$835K100,000 at $8.35filing
8 Oct 2026filed 9 Oct 2026PRTA Prothena CorporationBiotechnologySEC FORM 4 Bought$771K90,000 at $8.57filing
7 Oct 2026filed 9 Oct 2026PRTA Prothena CorporationBiotechnologySEC FORM 4 Bought$1.1M125,000 at $8.40filing
2 Oct 2026filed 6 Oct 2026PRTA Prothena CorporationBiotechnologySEC FORM 4 Bought$857K100,000 at $8.57filing
29 Sep 2026filed 30 Sep 2026PRTA Prothena CorporationBiotechnologySEC FORM 4 Bought$1.4M162,000 at $8.68filing
29 Sep 2026filed 30 Sep 2026PRTA Prothena CorporationBiotechnologySEC FORM 4 Bought$1.4M162,000 at $8.68filing
28 Sep 2026filed 29 Sep 2026PRTA Prothena CorporationBiotechnologySEC FORM 4 Bought$890K103,500 at $8.60filing
28 Sep 2026filed 29 Sep 2026PRTA Prothena CorporationBiotechnologySEC FORM 4 Bought$890K103,500 at $8.60filing
18 Sep 2026filed 21 Sep 2026PRTA Prothena CorporationBiotechnologySEC FORM 4 Bought$843K100,000 at $8.43filing
18 Sep 2026filed 21 Sep 2026PRTA Prothena CorporationBiotechnologySEC FORM 4 Bought$843K100,000 at $8.43filing
2 Sep 2026filed 3 Sep 2026PRTA Prothena CorporationBiotechnologySEC FORM 4 Bought$256K27,000 at $9.47filing
2 Sep 2026filed 3 Sep 2026PRTA Prothena CorporationBiotechnologySEC FORM 4 Bought$256K27,000 at $9.47filing
20 Aug 2026filed 21 Aug 2026PRTA Prothena CorporationBiotechnologySEC FORM 4 Bought$439K50,000 at $8.79filing
20 Aug 2026filed 21 Aug 2026PRTA Prothena CorporationBiotechnologySEC FORM 4 Bought$440K50,000 at $8.79filing
18 Aug 2026filed 18 Aug 2026PRTA Prothena CorporationBiotechnologySEC FORM 4 Code G—627,553 at $0.00filing
18 Aug 2026filed 18 Aug 2026PRTA Prothena CorporationBiotechnologySEC FORM 4 Code G—627,553 at $0.00filing
17 Aug 2026filed 18 Aug 2026PRTA Prothena CorporationBiotechnologySEC FORM 4 Code G—336,000 at $0.00filing
17 Aug 2026filed 18 Aug 2026PRTA Prothena CorporationBiotechnologySEC FORM 4 Code G—336,000 at $0.00filing
10 Aug 2026filed 11 Aug 2026PRTA Prothena CorporationBiotechnologySEC FORM 4 Code G—251,553 at $0.00filing

Sectors

Health Care20
Not placed14

Buys in green, sells in red, by the company’s sector.

Related people

Wagner M. ZagoChief Scientific Officer · Chief Scientific Officer at Prothena Corp Public Ltd Co, filing Form 4 there in the last year
Anne Evans KingstonChief Strategy Officer · Chief Strategy Officer at Prothena Corp Public Ltd Co, filing Form 4 there in the last year
Brandon S. SmithChief Operating Officer · Chief Operating Officer at Prothena Corp Public Ltd Co, filing Form 4 there in the last year
Karin L. WalkerChief Accounting Officer · Chief Accounting Officer at Prothena Corp Public Ltd Co, filing Form 4 there in the last year
Chad J. SwansonChief Development Officer · Chief Development Officer at Prothena Corp Public Ltd Co, filing Form 4 there in the last year
Michael John IsaacsGeneral Counsel & Company Sec. · Also traded PRTA in the last 90 days