Bonstein Sara

Director · Officer · XLO, INSM, SCPH

As of 2026-09-16, Bonstein Sara has 70 Form 4 transactions on record across 3 companies — 15 in the trailing 12 months.

Everything this person has disclosed to the SEC on Form 4 — across every company they file for — reconstructed from the public record. A filing history, not a tip sheet.

Pattern in the record: open-market sales filed in June in multiple years since 2025 — a recurring calendar cadence, more consistent with scheduled activity than a one-off decision.

Reconstructed holdings

Direct: $8.5MIndirect: $0$8.5Mas of 2026-09-16
  • Direct $8.5M
  • Indirect $0
INSMdirect69,082 sh$8.5M
XLOdirect5,000 sh$45K

Reconstructed from this person's own Form 4 filings — the total each filing reported owning afterward, priced at the close on the as-of date shown. A filed position can lag the real one.

Direct and indirect holdings (e.g. through a trust or fund) are tagged separately, as filed.

Trades by company

INSM · 64 trades
2026-06-03: Sale, 2,404 sh ($246K)2026-05-13: Sale, 8,272 sh ($961K)2026-02-03: Sale, 748 sh ($117K)2026-01-08: Sale, 1,447 sh ($252K)2026-01-07: Sale, 1,678 sh ($294K)2026-01-06: Sale, 1,517 sh ($263K)2026-01-02: Award / grant, 31,280 sh ($0)2026-01-02: Award / grant, 5,998 sh2026-01-02: Award / grant, 5,645 sh2026-01-02: Award / grant, 5,998 sh2026-01-02: Award / grant, 5,645 sh2025-07-21: Sale, 32,090 sh ($3.3M)2025-07-21: Sale, 26,310 sh ($2.7M)2025-07-21: Option exercise, 17,100 sh ($582K)2025-07-21: Option exercise, 15,890 sh ($463K)2025-07-21: Option exercise, 11,455 sh ($331K)2025-07-21: Option exercise, 3,443 sh ($91K)2025-07-21: Option exercise, 11,455 sh ($0)2025-07-21: Option exercise, 3,443 sh ($0)2025-07-21: Option exercise, 15,890 sh ($0)2025-07-21: Option exercise, 17,100 sh ($0)2025-07-07: Sale, 35,583 sh ($3.4M)2025-07-07: Sale, 22,181 sh ($2.1M)2025-07-07: Option exercise, 23,565 sh ($623K)2025-07-07: Option exercise, 13,717 sh ($363K)2025-07-07: Option exercise, 6,244 sh ($123K)2025-07-07: Option exercise, 4,362 sh ($108K)2025-07-07: Option exercise, 23,565 sh ($0)2025-07-07: Option exercise, 6,244 sh ($0)2025-07-07: Option exercise, 4,362 sh ($0)2025-07-07: Option exercise, 13,717 sh ($0)2025-06-23: Sale, 49,104 sh ($5.0M)2025-06-23: Sale, 8,661 sh ($885K)2025-06-23: Option exercise, 35,253 sh ($668K)2025-06-23: Option exercise, 12,636 sh ($249K)2025-06-23: Option exercise, 12,636 sh ($0)2025-06-23: Option exercise, 35,253 sh ($0)2025-06-10: Sale, 20,926 sh ($1.9M)2025-06-10: Sale, 15,825 sh ($1.4M)2025-06-10: Sale, 7,310 sh ($645K)2025-06-10: Sale, 7,277 sh ($634K)2025-06-10: Sale, 6,328 sh ($575K)2025-06-10: Option exercise, 24,150 sh ($458K)2025-06-10: Option exercise, 23,740 sh ($405K)2025-06-10: Sale, 100 sh ($9K)2025-06-10: Option exercise, 23,740 sh ($0)2025-06-10: Option exercise, 24,150 sh ($0)2025-06-03: Sale, 1,579 sh ($113K)2025-05-15: Award / grant, 31,610 sh ($0)2025-05-15: Award / grant, 6,508 sh ($0)2025-05-14: Sale, 1,634 sh ($107K)2025-05-13: Sale, 8,870 sh ($601K)2025-02-18: Sale, 17,622 sh ($1.4M)2025-02-18: Sale, 700 sh ($57K)2025-02-12: Sale, 5,019 sh ($402K)2025-02-11: Sale, 13,302 sh ($1.1M)2025-02-06: Sale, 28,390 sh ($2.3M)2025-02-05: Award / grant, 65,033 sh ($0)2025-01-10: Sale, 1,066 sh ($68K)2025-01-08: Sale, 1,464 sh ($97K)2025-01-08: Award / grant, 31,930 sh ($0)2025-01-08: Award / grant, 6,657 sh2025-01-08: Award / grant, 6,657 sh2025-01-07: Sale, 3,470 sh ($228K)
SCPH · 4 trades
2025-10-07: Disposition, 19,750 sh ($0)2025-10-07: Disposition, 16,300 sh ($0)2025-10-07: Disposition, 30,000 sh ($0)2025-06-03: Award / grant, 30,000 sh ($0)
XLO · 2 trades
2026-06-11: Award / grant, 5,000 sh ($0)2025-06-11: Award / grant, 31,000 sh ($0)

Filing ledger

DateCompanyActionShares @ priceValueOwnership ΔOwned afterFiling
2026-06-03INSMSale2,404 @ $102.27$246K−3.4% of holding69,082Form 4
2026-05-13INSMSale8,272 @ $116.18$961K−10.4% of holding71,486Form 4
2026-02-03INSMSale748 @ $156.34$117K−0.9% of holding79,758Form 4
2026-01-08INSMSale1,447 @ $174.17$252K−1.8% of holding80,506Form 4
2026-01-07INSMSale1,678 @ $175.07$294K−2.0% of holding81,953Form 4
2026-01-06INSMSale1,517 @ $173.33$263K−1.8% of holding83,631Form 4
2025-07-21INSMSale32,090 @ $102.38$3.3M−24.3% of holding99,815Form 4
2025-07-21INSMSale26,310 @ $103.03$2.7M−26.4% of holding73,505Form 4
2025-07-07INSMSale35,583 @ $95.66$3.4M−25.1% of holding106,198Form 4
2025-07-07INSMSale22,181 @ $96.19$2.1M−20.9% of holding84,017Form 4
2025-06-23INSMSale49,104 @ $101.71$5.0M−32.5% of holding102,197Form 4
2025-06-23INSMSale8,661 @ $102.15$885K−8.5% of holding93,536Form 4
2025-06-10INSMSale20,926 @ $88.99$1.9M−14.3% of holding125,665Form 4
2025-06-10INSMSale15,825 @ $89.85$1.4M−12.6% of holding109,840Form 4
2025-06-10INSMSale7,310 @ $88.29$645K−4.7% of holding146,591Form 4
2025-06-10INSMSale7,277 @ $87.12$634K−4.5% of holding153,901Form 4
2025-06-10INSMSale6,328 @ $90.93$575K−5.8% of holding103,512Form 4
2025-06-10INSMSale100 @ $91.66$9K−0.1% of holding103,412Form 4
2025-06-03INSMSale1,579 @ $71.50$113K−1.4% of holding113,288Form 4
2025-05-14INSMSale1,634 @ $65.61$107K−1.5% of holding108,359Form 4
2025-05-13INSMSale8,870 @ $67.81$601K−7.5% of holding109,993Form 4
2025-02-18INSMSale17,622 @ $80.28$1.4M−12.8% of holding119,563Form 4
2025-02-18INSMSale700 @ $81.00$57K−0.6% of holding118,863Form 4
2025-02-12INSMSale5,019 @ $80.00$402K−3.5% of holding137,185Form 4
2025-02-11INSMSale13,302 @ $80.00$1.1M−8.6% of holding142,204Form 4
2025-02-06INSMSale28,390 @ $80.90$2.3M−15.4% of holding155,506Form 4
2025-01-10INSMSale1,066 @ $63.72$68K−0.9% of holding118,863Form 4
2025-01-08INSMSale1,464 @ $66.05$97K−1.3% of holding113,272Form 4
2025-01-07INSMSale3,470 @ $65.70$228K−2.9% of holding114,736Form 4
41 award / exercise / gift records — not counted as purchases
DateCompanyActionSharesOwned afterFiling
2026-06-11XLOAward / grant5,0005,000Form 4
2026-01-02INSMAward / grant31,28031,280Form 4
2026-01-02INSMAward / grant5,99879,503Form 4
2026-01-02INSMAward / grant5,64585,148Form 4
2026-01-02INSMAward / grant5,99879,503Form 4
2026-01-02INSMAward / grant5,64585,148Form 4
2025-10-07SCPHDisposition19,7500Form 4
2025-10-07SCPHDisposition16,3000Form 4
2025-10-07SCPHDisposition30,0000Form 4
2025-07-21INSMOption exercise17,100131,905Form 4
2025-07-21INSMOption exercise15,890114,805Form 4
2025-07-21INSMOption exercise11,45598,915Form 4
2025-07-21INSMOption exercise3,44387,460Form 4
2025-07-21INSMOption exercise11,4550Form 4
2025-07-21INSMOption exercise3,4438,580Form 4
2025-07-21INSMOption exercise15,89047,670Form 4
2025-07-21INSMOption exercise17,1000Form 4
2025-07-07INSMOption exercise23,565128,064Form 4
2025-07-07INSMOption exercise13,717141,781Form 4
2025-07-07INSMOption exercise6,244100,137Form 4
2025-07-07INSMOption exercise4,362104,499Form 4
2025-07-07INSMOption exercise23,56515,710Form 4
2025-07-07INSMOption exercise6,24418,880Form 4
2025-07-07INSMOption exercise4,3620Form 4
2025-07-07INSMOption exercise13,71712,023Form 4
2025-06-23INSMOption exercise35,253138,665Form 4
2025-06-23INSMOption exercise12,636151,301Form 4
2025-06-23INSMOption exercise12,63625,124Form 4
2025-06-23INSMOption exercise35,25399,007Form 4
2025-06-11XLOAward / grant31,00031,000Form 4
2025-06-10INSMOption exercise24,150137,438Form 4
2025-06-10INSMOption exercise23,740161,178Form 4
2025-06-10INSMOption exercise23,74035,610Form 4
2025-06-10INSMOption exercise24,150134,260Form 4
2025-06-03SCPHAward / grant30,00030,000Form 4
2025-05-15INSMAward / grant31,61031,610Form 4
2025-05-15INSMAward / grant6,508114,867Form 4
2025-02-05INSMAward / grant65,033183,896Form 4
2025-01-08INSMAward / grant31,93031,930Form 4
2025-01-08INSMAward / grant6,657119,929Form 4

Source: SEC Form 4 filings. Each row links to its original filing.

Research tool, not investment advice — historical frequencies, not recommendations. A product of Marovel Technologies LLC. Full terms.