SION Insider Trading

Net Selling · 180d
Open-Market Buys (180d)
$0
0 insiders
Open-Market Sells (180d)
$109.4M
5 insiders
Net Insider Flow
-$109.4M
open market, 180d
Reporting Insiders
5
29 P/S transactions
Build

Build on these Form 4 transactions

The public view is the crawlable proof. The same sourced dataset is available through REST and MCP for agents, research scripts, and back-office tools.

Recent Form 4 Transactions

100 shown
DateInsiderRoleActionSharesPriceValue
Jul 7, 2026Orbimed Advisors LLCDirectorSell(S)86K$44.86$3.9M
Jul 7, 2026Thompson Peter A.DirectorSell(S)86K$44.86$3.9M
Jul 6, 2026Fitzpatrick JenniferChief Legal OfficerOption exercise(M)10K$6.11$63K
Jul 6, 2026Fitzpatrick JenniferChief Legal OfficerSell(S)10K$43.60$447K
Jul 6, 2026Fitzpatrick JenniferChief Legal OfficerOption exercise(M)10K$0
Jun 30, 2026Thompson Peter A.DirectorSell(S)116K$45.50$5.3M
Jun 30, 2026Orbimed Advisors LLCDirectorSell(S)116K$45.50$5.3M
Jun 17, 2026Booth BruceDirectorGrant(A)17K$0
Jun 17, 2026Ruddy Marcella K.DirectorGrant(A)17K$0
Jun 17, 2026Resnick JoshuaDirectorGrant(A)17K$0
Jun 17, 2026Fleming Harold EdwardDirectorGrant(A)17K$0
Jun 17, 2026Clancy Paul JDirectorGrant(A)17K$0
Jun 17, 2026Viney Joanne L.DirectorGrant(A)17K$0
Jun 17, 2026Thompson Peter A.DirectorGrant(A)17K$0
Jun 17, 2026Ra Capital Management, L.P.Director, 10% OwnerGrant(A)17K$0
Jun 17, 2026Stelzer LaurieDirectorGrant(A)17K$0
May 27, 2026Thompson Peter A.DirectorSell(S)101$44.49$4K
May 27, 2026Orbimed Advisors LLCDirectorSell(S)101$44.49$4K
May 11, 2026Thompson Peter A.DirectorSell(S)185K$46.22$8.5M
May 11, 2026Orbimed Advisors LLCDirectorSell(S)185K$46.22$8.5M
May 8, 2026Thompson Peter A.DirectorSell(S)60K$44.58$2.7M
May 8, 2026Orbimed Advisors LLCDirectorSell(S)60K$44.58$2.7M
May 7, 2026Thompson Peter A.DirectorSell(S)49K$44.61$2.2M
May 7, 2026Orbimed Advisors LLCDirectorSell(S)49K$44.61$2.2M
Apr 18, 2026Thompson Peter A.DirectorSell(S)3K$44.52$131K
Apr 18, 2026Orbimed Advisors LLCDirectorSell(S)3K$44.52$131K
Apr 17, 2026Thompson Peter A.DirectorSell(S)52K$44.68$2.3M
Apr 17, 2026Orbimed Advisors LLCDirectorSell(S)52K$44.68$2.3M
Apr 16, 2026Thompson Peter A.DirectorSell(S)227K$45.34$10.3M
Apr 16, 2026Orbimed Advisors LLCDirectorSell(S)227K$45.34$10.3M
Apr 15, 2026Thompson Peter A.DirectorSell(S)236K$44.64$10.5M
Apr 15, 2026Orbimed Advisors LLCDirectorSell(S)236K$44.64$10.5M
Apr 14, 2026Thompson Peter A.DirectorSell(S)48K$44.51$2.1M
Apr 14, 2026Orbimed Advisors LLCDirectorSell(S)48K$44.51$2.1M
Mar 5, 2026Fitzpatrick JenniferChief Legal OfficerSell(S)10K$33.86$347K
Mar 5, 2026Fitzpatrick JenniferChief Legal OfficerOption exercise(M)10K$6.11$63K
Mar 5, 2026Fitzpatrick JenniferChief Legal OfficerOption exercise(M)10K$0
Feb 3, 2026OrbiMed Capital GP VIII LLCDirectorSell(S)29K$44.58$1.3M
Feb 3, 2026Thompson Peter A.DirectorSell(S)29K$44.58$1.3M
Feb 2, 2026OrbiMed Capital GP VIII LLCDirectorSell(S)2K$44.57$84K
Feb 2, 2026Thompson Peter A.DirectorSell(S)2K$44.57$84K
Jan 22, 2026Winkelried Jon10% OwnerSell(S)250K$40.00$10.0M
Jan 2, 2026Cloonan MichaelPresident & CEO, DirectorGrant(A)436K$0
Jan 2, 2026Ridloff ElenaCFOGrant(A)165K$0
Jan 2, 2026McKee CharlotteChief Medical OfficerGrant(A)156K$0
Jan 2, 2026Fitzpatrick JenniferChief Legal OfficerGrant(A)103K$0
Jan 2, 2026Beer Caroline StarkChief Business OfficerGrant(A)139K$0
Dec 24, 2025Thompson Peter A.DirectorSell(S)33K$44.55$1.5M
Dec 24, 2025OrbiMed Capital GP VIII LLCDirectorSell(S)33K$44.55$1.5M
Dec 19, 2025Thompson Peter A.DirectorSell(S)875$44.49$39K
Dec 19, 2025OrbiMed Capital GP VIII LLCDirectorSell(S)875$44.49$39K
Dec 18, 2025Thompson Peter A.DirectorSell(S)100$44.49$4K
Dec 18, 2025OrbiMed Capital GP VIII LLCDirectorSell(S)100$44.49$4K
Dec 17, 2025Thompson Peter A.DirectorSell(S)900$44.50$40K
Dec 17, 2025OrbiMed Capital GP VIII LLCDirectorSell(S)900$44.50$40K
Dec 5, 2025Fitzpatrick JenniferChief Legal OfficerSell(S)10K$40.52$415K
Dec 5, 2025Fitzpatrick JenniferChief Legal OfficerOption exercise(M)10K$6.11$63K
Dec 5, 2025Fitzpatrick JenniferChief Legal OfficerOption exercise(M)10K$0
Nov 26, 2025Thompson Peter A.DirectorSell(S)2K$44.49$71K
Nov 26, 2025Orbimed Advisors LLCDirectorSell(S)2K$44.49$71K
Nov 25, 2025Thompson Peter A.DirectorSell(S)12K$44.60$530K
Nov 25, 2025Orbimed Advisors LLCDirectorSell(S)12K$44.60$530K
Nov 24, 2025Thompson Peter A.DirectorSell(S)95K$44.54$4.2M
Nov 24, 2025Orbimed Advisors LLCDirectorSell(S)95K$44.54$4.2M
Nov 21, 2025Kolchinsky PeterDirector, 10% OwnerSell(S)8K$39.50$301K
Nov 21, 2025Kolchinsky PeterDirector, 10% OwnerSell(S)1K$39.50$48K
Nov 21, 2025Kolchinsky PeterDirector, 10% OwnerSell(S)10K$39.50$392K
Nov 21, 2025Kolchinsky PeterDirector, 10% OwnerSell(S)6K$39.50$254K
Nov 20, 2025Kolchinsky PeterDirector, 10% OwnerSell(S)150$39.89$6K
Nov 20, 2025Kolchinsky PeterDirector, 10% OwnerSell(S)1K$39.89$49K
Nov 20, 2025Kolchinsky PeterDirector, 10% OwnerSell(S)801$39.89$32K
Nov 20, 2025Kolchinsky PeterDirector, 10% OwnerSell(S)947$39.89$38K
Nov 20, 2025Kolchinsky PeterDirector, 10% OwnerSell(S)96$40.50$4K
Nov 20, 2025Kolchinsky PeterDirector, 10% OwnerSell(S)512$40.50$21K
Nov 20, 2025Kolchinsky PeterDirector, 10% OwnerSell(S)604$40.50$24K
Nov 20, 2025Kolchinsky PeterDirector, 10% OwnerSell(S)788$40.50$32K
Nov 19, 2025Ra Capital Management, L.P.Director, 10% OwnerSell(S)9$40.61$365
Nov 19, 2025Ra Capital Management, L.P.Director, 10% OwnerSell(S)8$40.61$325
Nov 19, 2025Ra Capital Management, L.P.Director, 10% OwnerSell(S)12$40.61$487
Nov 19, 2025Ra Capital Management, L.P.Director, 10% OwnerSell(S)2$40.61$81
Nov 19, 2025Ra Capital Management, L.P.Director, 10% OwnerSell(S)14K$40.01$573K
Nov 19, 2025Ra Capital Management, L.P.Director, 10% OwnerSell(S)12K$40.01$485K
Nov 19, 2025Ra Capital Management, L.P.Director, 10% OwnerSell(S)19K$40.01$748K
Nov 19, 2025Ra Capital Management, L.P.Director, 10% OwnerSell(S)2K$40.01$91K
Nov 18, 2025Ra Capital Management, L.P.Director, 10% OwnerSell(S)2K$39.57$70K
Nov 18, 2025Ra Capital Management, L.P.Director, 10% OwnerSell(S)3K$39.57$108K
Nov 18, 2025Ra Capital Management, L.P.Director, 10% OwnerSell(S)332$39.57$13K
Nov 18, 2025Ra Capital Management, L.P.Director, 10% OwnerSell(S)2K$39.57$83K
Nov 17, 2025Ra Capital Management, L.P.Director, 10% OwnerSell(S)53$42.10$2K
Nov 17, 2025Ra Capital Management, L.P.Director, 10% OwnerSell(S)433$42.10$18K
Nov 17, 2025Ra Capital Management, L.P.Director, 10% OwnerSell(S)280$42.10$12K
Nov 17, 2025Ra Capital Management, L.P.Director, 10% OwnerSell(S)331$42.10$14K
Nov 17, 2025Ra Capital Management, L.P.Director, 10% OwnerSell(S)11K$41.05$440K
Nov 17, 2025Ra Capital Management, L.P.Director, 10% OwnerSell(S)9K$41.05$372K
Nov 17, 2025Ra Capital Management, L.P.Director, 10% OwnerSell(S)14K$41.05$573K
Nov 17, 2025Ra Capital Management, L.P.Director, 10% OwnerSell(S)2K$41.05$70K
Nov 17, 2025Ra Capital Management, L.P.Director, 10% OwnerSell(S)14K$40.20$552K
Nov 17, 2025Ra Capital Management, L.P.Director, 10% OwnerSell(S)12K$40.20$467K
Nov 17, 2025Ra Capital Management, L.P.Director, 10% OwnerSell(S)18K$40.20$720K
Nov 17, 2025Ra Capital Management, L.P.Director, 10% OwnerSell(S)2K$40.20$88K

Data Source

Insider transactions sourced from SEC EDGAR Form 4 filings, normalized within minutes of acceptance. "Buy"/"Sell" mark open-market transactions (codes P/S), the tradeable signal. Awards, option exercises and tax-withholding are shown with their raw code. All data is public domain.

Coverage: Form 4 filings indexed 2021-03-292026-07-11. Earlier history is backfilling; this window widens as it deepens.

Programmatic access via the Arkolith API & MCP server (insider.transactions, insider.company).