John Langton Sennott Jr.

Chief Financial Officer, Darwin Professional Underwriters Inc.

Companies

Ategrity Specialty Insurance Co HoldingsBoard member Jun 11, 2025 to now¹
Alleghany CorporationChief financial officer Jun 3, 2013 to Jul 1, 2019²
Alleghany CorporationSVP Apr 26, 2013 to May 13, 2013³

Holdings

Stock this person has reported owning, from the forms officers and directors file with the SEC. See the biggest insider stakes.

Shares held

Ategrity Specialty Insurance Co Holdings ASIC30,380 shares⁴$820.3K at $27.00Jun 11, 2026

As of each latest filing. The line shows shares held over time.

Recent filings

Jun 11, 2026Exercised options 980 shares of Ategrity Specialty Insurance Co Holdings⁴
Jun 12, 2025Bought 29,400 shares at $17.00 of Ategrity Specialty Insurance Co Holdings⁵

Sources

The numbers on this page point here. Each one links to the record it came from.

1
SEC EDGARAtegrity Specialty Insurance Co Holdings, Board member
2
SEC EDGARAlleghany Corporation, Chief financial officer
3
SEC EDGARAlleghany Corporation, SVP
4
SEC EDGARAtegrity Specialty Insurance Co Holdings shares after the filing of Jun 11, 2026
5
SEC EDGARForm 4 filed Jun 16, 2025