Mento Steven J

Director at SANGAMO THERAPEUTICS, INC · on record since Jun 8, 2006
Director at Histogen Inc. · on record since Jul 24, 2013
Director at Dermata Therapeutics, Inc. · on record since Aug 17, 2021
President and CEO at Histogen Inc. · on record since Jul 24, 2013

Insider trading activity of Mento Steven J

Transactions on record: 101; since May 26, 2005

Open-market buys: 1; $151.8K

Open-market sells: 21; $1.5M

Companies traded: 3; last filing Jan 6, 2026

Figures computed from official regulatory filings — .

Companies where Mento Steven J has traded

Dermata Therapeutics, Inc.5 tx · Jan 6, 2026
Histogen Inc.36 tx · $3.1M · Nov 9, 2022
SANGAMO THERAPEUTICS, INC60 tx · $2.4M · Jun 12, 2018

Track record of Mento Steven J

Insufficient history for a statistical track record (fewer than 5 open-market buys).

Transaction history of Mento Steven J

Co-insiders of Mento Steven J

HALE DAVID FDermata Therapeutics, Inc. +1
Scott Kathleen D.Dermata Therapeutics, Inc. +1
Aberdare GP III, L.L.C.Histogen Inc.
Aberdare Partners III LPHistogen Inc.
Aberdare Ventures III LPHistogen Inc.
ADVENT VENTURE PARTNERS LLPHistogen Inc.
ANDO DALE GSANGAMO THERAPEUTICS, INC
Bedoya-Toro Maria EDermata Therapeutics, Inc.
Beers CourtneySANGAMO THERAPEUTICS, INC
BIOGEN IDEC INCSANGAMO THERAPEUTICS, INC
Biogen MA Inc.SANGAMO THERAPEUTICS, INC
BLUFORD PETERSANGAMO THERAPEUTICS, INC
Boissel StephaneSANGAMO THERAPEUTICS, INC
Bradrick BrittanyDermata Therapeutics, Inc.
BURGESS GARY C.Histogen Inc.
Carey RobertSANGAMO THERAPEUTICS, INC

This page republishes public regulatory disclosures.

Company	Filed	Type	Qty	Price	Value · USD	Src
Dermata Therapeutics, Inc.Listing on record	Jan 6, 2026	AwardD (derivative)	2,500	0.00 USD	—	SEC
Dermata Therapeutics, Inc.Listing on record	Jan 14, 2025	AwardD (derivative)	5,000	0.00 USD	—	SEC
Dermata Therapeutics, Inc.Listing on record	Jan 5, 2024	AwardD (derivative)	10,000	0.00 USD	—	SEC
Histogen Inc.Listing unverified	Nov 9, 2022	OtherD (derivative)	-11,419	250.00 USD	$2.9M	SEC
Histogen Inc.Listing unverified	Feb 25, 2022	AwardD (derivative)	151,642	0.00 USD	—	SEC
Dermata Therapeutics, Inc.Listing on record	Jan 5, 2022	AwardD (derivative)	5,000	0.00 USD	—	SEC
Histogen Inc.Listing unverified	Nov 10, 2021	AwardD (derivative)	377,830	0.00 USD	—	SEC
Histogen Inc.Listing unverified	Nov 10, 2021	AwardD (derivative)	228,395	0.00 USD	—	SEC
Histogen Inc.Listing unverified	Sep 3, 2021	AwardD (derivative)	20,000	0.00 USD	—	SEC
Dermata Therapeutics, Inc.Listing on record	Aug 17, 2021	AwardD (derivative)	10,000	0.00 USD	—	SEC
Histogen Inc.Listing unverified	Oct 9, 2020	AwardD (derivative)	20,000	0.00 USD	—	SEC
Histogen Inc.Listing unverified	May 27, 2020	ExerciseD (derivative)	-65,000	0.00 USD	—	SEC
Histogen Inc.Listing unverified	May 27, 2020	Exercise	65,000	0.00 USD	—	SEC
Histogen Inc.Listing unverified	May 27, 2020	Other	-31,428	0.56 USD	$17.6K	SEC
Histogen Inc.Listing unverified	Aug 1, 2019	OtherD (derivative)	-350,000	—	—	SEC
Histogen Inc.Listing unverified	Aug 1, 2019	OtherD (derivative)	-400,000	—	—	SEC
Histogen Inc.Listing unverified	Aug 1, 2019	OtherD (derivative)	-50,000	—	—	SEC
Histogen Inc.Listing unverified	Aug 1, 2019	OtherD (derivative)	-20,000	—	—	SEC
Histogen Inc.Listing unverified	Aug 1, 2019	OtherD (derivative)	-37,500	—	—	SEC
Histogen Inc.Listing unverified	Aug 1, 2019	OtherD (derivative)	-172,500	—	—	SEC
Histogen Inc.Listing unverified	Aug 1, 2019	OtherD (derivative)	-150,000	—	—	SEC
Histogen Inc.Listing unverified	Aug 1, 2019	OtherD (derivative)	-120,000	—	—	SEC
Histogen Inc.Listing unverified	Aug 1, 2019	AwardD (derivative)	650,000	0.00 USD	—	SEC
Histogen Inc.Listing unverified	Feb 11, 2019	AwardD (derivative)	350,000	0.00 USD	—	SEC
SANGAMO THERAPEUTICS, INCListing on record	Jun 12, 2018	AwardD (derivative)	15,000	0.00 USD	—	SEC

Company	Filed	Type	Qty	Price	Value · USD	Src
Dermata Therapeutics, Inc.Listing on record	Jan 6, 2026	AwardD (derivative)	2,500	0.00 USD	—	SEC
Dermata Therapeutics, Inc.Listing on record	Jan 14, 2025	AwardD (derivative)	5,000	0.00 USD	—	SEC
Dermata Therapeutics, Inc.Listing on record	Jan 5, 2024	AwardD (derivative)	10,000	0.00 USD	—	SEC
Histogen Inc.Listing unverified	Nov 9, 2022	OtherD (derivative)	-11,419	250.00 USD	$2.9M	SEC
Histogen Inc.Listing unverified	Feb 25, 2022	AwardD (derivative)	151,642	0.00 USD	—	SEC
Dermata Therapeutics, Inc.Listing on record	Jan 5, 2022	AwardD (derivative)	5,000	0.00 USD	—	SEC
Histogen Inc.Listing unverified	Nov 10, 2021	AwardD (derivative)	377,830	0.00 USD	—	SEC
Histogen Inc.Listing unverified	Nov 10, 2021	AwardD (derivative)	228,395	0.00 USD	—	SEC
Histogen Inc.Listing unverified	Sep 3, 2021	AwardD (derivative)	20,000	0.00 USD	—	SEC
Dermata Therapeutics, Inc.Listing on record	Aug 17, 2021	AwardD (derivative)	10,000	0.00 USD	—	SEC
Histogen Inc.Listing unverified	Oct 9, 2020	AwardD (derivative)	20,000	0.00 USD	—	SEC
Histogen Inc.Listing unverified	May 27, 2020	ExerciseD (derivative)	-65,000	0.00 USD	—	SEC
Histogen Inc.Listing unverified	May 27, 2020	Exercise	65,000	0.00 USD	—	SEC
Histogen Inc.Listing unverified	May 27, 2020	Other	-31,428	0.56 USD	$17.6K	SEC
Histogen Inc.Listing unverified	Aug 1, 2019	OtherD (derivative)	-350,000	—	—	SEC
Histogen Inc.Listing unverified	Aug 1, 2019	OtherD (derivative)	-400,000	—	—	SEC
Histogen Inc.Listing unverified	Aug 1, 2019	OtherD (derivative)	-50,000	—	—	SEC
Histogen Inc.Listing unverified	Aug 1, 2019	OtherD (derivative)	-20,000	—	—	SEC
Histogen Inc.Listing unverified	Aug 1, 2019	OtherD (derivative)	-37,500	—	—	SEC
Histogen Inc.Listing unverified	Aug 1, 2019	OtherD (derivative)	-172,500	—	—	SEC
Histogen Inc.Listing unverified	Aug 1, 2019	OtherD (derivative)	-150,000	—	—	SEC
Histogen Inc.Listing unverified	Aug 1, 2019	OtherD (derivative)	-120,000	—	—	SEC
Histogen Inc.Listing unverified	Aug 1, 2019	AwardD (derivative)	650,000	0.00 USD	—	SEC
Histogen Inc.Listing unverified	Feb 11, 2019	AwardD (derivative)	350,000	0.00 USD	—	SEC
SANGAMO THERAPEUTICS, INCListing on record	Jun 12, 2018	AwardD (derivative)	15,000	0.00 USD	—	SEC