SEC Form 4 reporting owner

Bonstein Sara

Bonstein Sara has filed 10 Form 4 transactions reported between January 2, 2026 and June 11, 2026, as a reporting owner of Xilio Therapeutics, Inc. and Chief Financial Officer of INSMED Inc.

Name as filed: Bonstein Sara

Open-market buys, 24 mo

None

reported

Open-market sales, 24 mo

$2.1M

6 lines

Companies

with Form 4 filings

Latest transaction

Jun 11, 2026

transaction date

Roles and reported holdings

XLOXilio Therapeutics, Inc.
Jun 11, 2026
Reporting owner
No common-stock holding reported on a purchase, sale, gift or withholding line.
INSMINSMED Inc
Jan 2, 2026 – Jun 3, 2026
Chief Financial Officer
Held directly69,082 sh as of Jun 3, 2026 · Form 4
24 months: $2.1M sold

Transaction history

All 10 reported transactions, newest first. Every row links to the Form 4 on SEC EDGAR.

Date	Company	Type	Shares	Price	Value	Owned after	Filing
Jun 11, 2026	XLO	Grant or awardCode A · direct	5,000	—	—	5,000	Form 4
Jun 3, 2026	INSMChief Financial Officer	Open-market saleCode S · direct	2,404	$102.27	$246K@ $102.27	69,082	Form 4
May 13, 2026	INSMChief Financial Officer	Open-market saleCode S · direct	8,272	$116.18	$961K@ $116.18	71,486	Form 4
Feb 3, 2026	INSMChief Financial Officer	Open-market saleCode S · direct	748	$156.34	$117K@ $156.34	79,758	Form 4
Jan 8, 2026	INSMChief Financial Officer	Open-market saleCode S · direct	1,447	$174.17	$252K@ $174.17	80,506	Form 4
Jan 7, 2026	INSMChief Financial Officer	Open-market saleCode S · direct	1,678	$175.07	$294K@ $175.07	81,953	Form 4
Jan 6, 2026	INSMChief Financial Officer	Open-market saleCode S · direct	1,517	$173.33	$263K@ $173.33	83,631	Form 4
Jan 2, 2026	INSMChief Financial Officer	Grant or awardCode A · direct	31,280	—	—	31,280	Form 4
Jan 2, 2026	INSMChief Financial Officer	Grant or awardCode A · direct	5,645	—	—	85,148	Form 4
Jan 2, 2026	INSMChief Financial Officer	Grant or awardCode A · direct	5,998	—	—	79,503	Form 4

How this page is built

Every row comes from a Form 4 filed with the SEC, which officers, directors and holders of more than 10% of a company’s stock must file within two business days of a trade. Transactions are grouped by the reporting owner’s name as filed (spacing, capitals and punctuation ignored); two different people filing under an identical name would appear together, and one person filing under two spellings appears on two pages.

Open-market totals count code P purchases and code S sales over the last 24 months. The same trade reported on more than one filing is counted once; when another owner (for example a fund and its general partner) reports the identical trade, they are listed beside it. Holdings are the shares owned after the latest purchase, sale, gift or tax-withholding line, shown separately for direct and indirect ownership; an indirect figure is one holding line, not a total across every trust or entity.

This page describes what was filed with the SEC; it is not investment advice or a recommendation to buy or sell any security.