Sennott John Langton JR

Director at Darwin Professional Underwriters Inc · on record since May 23, 2006
S.V.P. - CFO at Darwin Professional Underwriters Inc · on record since Feb 26, 2007
EVP, Chief Corp. Strat Officer at Allied World Assurance Co Holdings, GmbH · on record since Nov 20, 2009
SVP, Chief Financial Officer at ALLEGHANY CORP /DE · on record since Jun 3, 2013
Director at Ategrity Specialty Insurance Co Holdings · on record since Jun 16, 2026

Insider trading activity of Sennott John Langton JR

Transactions on record: 99; since May 23, 2006

Open-market buys: 11; $1.2M

Open-market sells: 0

Companies traded: 4; last filing Jun 16, 2026

Figures computed from official regulatory filings — .

Companies where Sennott John Langton JR has traded

Ategrity Specialty Insurance Co Holdings4 tx · $499.8K · Jun 16, 2026
ALLEGHANY CORP /DE51 tx · $7.2M · Jul 1, 2019
Allied World Assurance Co Holdings, GmbH30 tx · $486.2K · Feb 28, 2012
Darwin Professional Underwriters Inc14 tx · $6.1M · Oct 21, 2008

Track record of Sennott John Langton JR

Open-market buys: 11

Last buy: Jun 12, 2025

Enough buys on record, but none of them has a 63-day return yet — this happens when the shares stopped trading, or when the buys are too recent. Win rates will appear once returns mature.

Transaction history of Sennott John Langton JR

Co-insiders of Sennott John Langton JR

This page republishes public regulatory disclosures.

Company	Filed	Type	Qty	Price	Value · USD	Signals	Src
Ategrity Specialty Insurance Co HoldingsListing unverified	Jun 16, 2026	ExerciseD (derivative)	-980	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
Ategrity Specialty Insurance Co HoldingsListing unverified	Jun 16, 2026	Exercise	980	—	n/a (No price was disclosed in the filing)		SEC
Ategrity Specialty Insurance Co HoldingsListing unverified	Jun 16, 2025	Buy	29,400	17.00 USD	$499.8K	conv 82ClusterUnusual size+1	SEC
Ategrity Specialty Insurance Co HoldingsListing unverified	Jun 16, 2025	AwardD (derivative)	2,941	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
ALLEGHANY CORP /DEListing unverified	Jul 1, 2019	AwardD (derivative)	37.93	678.48 USD	$25.7K		SEC
ALLEGHANY CORP /DEListing unverified	Apr 2, 2019	AwardD (derivative)	43.76	612.76 USD	$26.8K		SEC
ALLEGHANY CORP /DEListing unverified	Apr 2, 2019	AwardD (derivative)	589	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
ALLEGHANY CORP /DEListing unverified	Feb 4, 2019	Exercise	708	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
ALLEGHANY CORP /DEListing unverified	Feb 4, 2019	Other	-243	635.73 USD	$154.5K		SEC
ALLEGHANY CORP /DEListing unverified	Feb 4, 2019	ExerciseD (derivative)	-708	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
ALLEGHANY CORP /DEListing unverified	Jan 3, 2019	AwardD (derivative)	40.73	620.37 USD	$25.3K		SEC
ALLEGHANY CORP /DEListing unverified	Oct 2, 2018	AwardD (derivative)	38.93	649.09 USD	$25.3K		SEC
ALLEGHANY CORP /DEListing unverified	Jul 2, 2018	AwardD (derivative)	43.44	581.64 USD	$25.3K		SEC
ALLEGHANY CORP /DEListing unverified	Apr 3, 2018	AwardD (derivative)	40.95	614.08 USD	$25.1K		SEC
ALLEGHANY CORP /DEListing unverified	Feb 28, 2018	Award	1,846	606.97 USD	$1.1M	Unusual size	SEC
ALLEGHANY CORP /DEListing unverified	Feb 28, 2018	Other	-892	606.97 USD	$541.4K		SEC
ALLEGHANY CORP /DEListing unverified	Jan 26, 2018	AwardD (derivative)	584	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
ALLEGHANY CORP /DEListing unverified	Jan 23, 2018	ExerciseD (derivative)	-759	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
ALLEGHANY CORP /DEListing unverified	Jan 23, 2018	Other	-264	591.09 USD	$156K		SEC
ALLEGHANY CORP /DEListing unverified	Jan 23, 2018	Exercise	759	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
ALLEGHANY CORP /DEListing unverified	Jan 3, 2018	AwardD (derivative)	41.21	595.32 USD	$24.5K		SEC
ALLEGHANY CORP /DEListing unverified	Oct 2, 2017	AwardD (derivative)	44.51	551.27 USD	$24.5K		SEC
ALLEGHANY CORP /DEListing unverified	Jul 5, 2017	AwardD (derivative)	41.33	593.63 USD	$24.5K		SEC
ALLEGHANY CORP /DEListing unverified	Apr 3, 2017	AwardD (derivative)	39.52	617.72 USD	$24.4K		SEC
ALLEGHANY CORP /DEListing unverified	Mar 1, 2017	Award	1,840	647.76 USD	$1.2M	Unusual size	SEC

Company	Filed	Type	Qty	Price	Value · USD	Signals	Src
Ategrity Specialty Insurance Co HoldingsListing unverified	Jun 16, 2026	ExerciseD (derivative)	-980	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
Ategrity Specialty Insurance Co HoldingsListing unverified	Jun 16, 2026	Exercise	980	—	n/a (No price was disclosed in the filing)		SEC
Ategrity Specialty Insurance Co HoldingsListing unverified	Jun 16, 2025	Buy	29,400	17.00 USD	$499.8K	conv 82ClusterUnusual size+1	SEC
Ategrity Specialty Insurance Co HoldingsListing unverified	Jun 16, 2025	AwardD (derivative)	2,941	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
ALLEGHANY CORP /DEListing unverified	Jul 1, 2019	AwardD (derivative)	37.93	678.48 USD	$25.7K		SEC
ALLEGHANY CORP /DEListing unverified	Apr 2, 2019	AwardD (derivative)	43.76	612.76 USD	$26.8K		SEC
ALLEGHANY CORP /DEListing unverified	Apr 2, 2019	AwardD (derivative)	589	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
ALLEGHANY CORP /DEListing unverified	Feb 4, 2019	Exercise	708	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
ALLEGHANY CORP /DEListing unverified	Feb 4, 2019	Other	-243	635.73 USD	$154.5K		SEC
ALLEGHANY CORP /DEListing unverified	Feb 4, 2019	ExerciseD (derivative)	-708	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
ALLEGHANY CORP /DEListing unverified	Jan 3, 2019	AwardD (derivative)	40.73	620.37 USD	$25.3K		SEC
ALLEGHANY CORP /DEListing unverified	Oct 2, 2018	AwardD (derivative)	38.93	649.09 USD	$25.3K		SEC
ALLEGHANY CORP /DEListing unverified	Jul 2, 2018	AwardD (derivative)	43.44	581.64 USD	$25.3K		SEC
ALLEGHANY CORP /DEListing unverified	Apr 3, 2018	AwardD (derivative)	40.95	614.08 USD	$25.1K		SEC
ALLEGHANY CORP /DEListing unverified	Feb 28, 2018	Award	1,846	606.97 USD	$1.1M	Unusual size	SEC
ALLEGHANY CORP /DEListing unverified	Feb 28, 2018	Other	-892	606.97 USD	$541.4K		SEC
ALLEGHANY CORP /DEListing unverified	Jan 26, 2018	AwardD (derivative)	584	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
ALLEGHANY CORP /DEListing unverified	Jan 23, 2018	ExerciseD (derivative)	-759	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
ALLEGHANY CORP /DEListing unverified	Jan 23, 2018	Other	-264	591.09 USD	$156K		SEC
ALLEGHANY CORP /DEListing unverified	Jan 23, 2018	Exercise	759	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
ALLEGHANY CORP /DEListing unverified	Jan 3, 2018	AwardD (derivative)	41.21	595.32 USD	$24.5K		SEC
ALLEGHANY CORP /DEListing unverified	Oct 2, 2017	AwardD (derivative)	44.51	551.27 USD	$24.5K		SEC
ALLEGHANY CORP /DEListing unverified	Jul 5, 2017	AwardD (derivative)	41.33	593.63 USD	$24.5K		SEC
ALLEGHANY CORP /DEListing unverified	Apr 3, 2017	AwardD (derivative)	39.52	617.72 USD	$24.4K		SEC
ALLEGHANY CORP /DEListing unverified	Mar 1, 2017	Award	1,840	647.76 USD	$1.2M	Unusual size	SEC