Insider Trading & Ownership of David Arkowitz

Location: Burlington, MA
Summary: The estimated net worth of David Arkowitz is at least $2,166,179 dollars as of 24 Nov 2025. David Arkowitz is the Chief Financial Officer of Flexion Therapeutics Inc and owns shares of Flexion Therapeutics Inc stock worth about $1.88M. David Arkowitz is the Chief Financial Officer of Seres Therapeutics, Inc. and owns shares of Seres Therapeutics, Inc. (MCRB) stock worth about $240.1K. David Arkowitz is the Director of iBio, Inc. and owns shares of iBio, Inc. (IBIO) stock worth about $50K.
Signature: /s/ Marc Banjak, Attorney-in-fact
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Ownership of David Arkowitz

Symbol	Company	Relationship	Holdings Value	Report Period
FLXN	Flexion Therapeutics Inc	Chief Financial Officer	$1,876,112	10 May 2021
MCRB	Seres Therapeutics, Inc.	Chief Financial Officer	$240,068	14 Feb 2024
IBIO	iBio, Inc.	Director	$49,999	20 Nov 2025
KANT	KINETA, INC./DE	Director	$0	30 Jun 2025
FSTX	F-star Therapeutics, Inc.	Director		17 Jun 2022

Sym	Company	Class	Transaction	%	Value $	* Price $	Shares	Shares After	Date	Ownership

* An asterisk sign (*) next to the price indicates that the price is likely invalid.