Belsky Marc

VP Finance & CAO at CELL GENESYS INC · on record since Oct 15, 2009
Senior Vice President and CFO at FIVE PRIME THERAPEUTICS, INC. · on record since Mar 31, 2016
Chief Financial Officer at Kezar Life Sciences, Inc. · on record since Sep 10, 2019

Insider trading activity of Belsky Marc

Transactions on record: 88; since Dec 5, 2006

Open-market buys: 6; $48.3K

Open-market sells: 5; $3.2M

Companies traded: 3; last filing May 11, 2026

Figures computed from official regulatory filings — .

Companies where Belsky Marc has traded

Kezar Life Sciences, Inc.40 tx · $48.3K · May 11, 2026
FIVE PRIME THERAPEUTICS, INC.41 tx · $5.5M · Feb 28, 2018
CELL GENESYS INC7 tx · $11.4K · Oct 15, 2009

Track record of Belsky Marc

Statistical track record

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Open-market buys: 6

Last buy: Feb 4, 2020

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Transaction history of Belsky Marc

Co-insiders of Belsky Marc

This page republishes public regulatory disclosures.

Company	Filed	Type	Qty	Price	Value · USD	Src
Kezar Life Sciences, Inc.Security delisted	May 11, 2026	OtherD (derivative)	-17,793	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))	SEC
Kezar Life Sciences, Inc.Security delisted	May 11, 2026	OtherD (derivative)	-5,999	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))	SEC
Kezar Life Sciences, Inc.Security delisted	May 11, 2026	OtherD (derivative)	-5,999	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))	SEC
Kezar Life Sciences, Inc.Security delisted	May 11, 2026	Other	-200	—	n/a (No price was disclosed in the filing)	SEC
Kezar Life Sciences, Inc.Security delisted	May 11, 2026	OtherD (derivative)	-24,500	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))	SEC
Kezar Life Sciences, Inc.Security delisted	May 11, 2026	OtherD (derivative)	-13,999	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))	SEC
Kezar Life Sciences, Inc.Security delisted	May 11, 2026	OtherD (derivative)	-12,000	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))	SEC
Kezar Life Sciences, Inc.Security delisted	May 11, 2026	OtherD (derivative)	-19,499	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))	SEC
Kezar Life Sciences, Inc.Security delisted	May 11, 2026	Other	-1,538	—	n/a (No price was disclosed in the filing)	SEC
Kezar Life Sciences, Inc.Security delisted	May 11, 2026	OtherD (derivative)	-21,999	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))	SEC
Kezar Life Sciences, Inc.Security delisted	May 11, 2026	OtherD (derivative)	-29,499	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))	SEC
Kezar Life Sciences, Inc.Security delisted	May 11, 2026	OtherD (derivative)	-8,999	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))	SEC
Kezar Life Sciences, Inc.Security delisted	Apr 1, 2025	AwardD (derivative)	4,800	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))	SEC
Kezar Life Sciences, Inc.Security delisted	Mar 5, 2025	AwardD (derivative)	7,200	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))	SEC
Kezar Life Sciences, Inc.Security delisted	Jan 13, 2025	AwardD (derivative)	24,500	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))	SEC
Kezar Life Sciences, Inc.Security delisted	Jan 9, 2024	AwardD (derivative)	295,000	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))	SEC
Kezar Life Sciences, Inc.Security delisted	Jul 26, 2023	OtherD (derivative)	-220,000	—	n/a (No price was disclosed in the filing)	SEC
Kezar Life Sciences, Inc.Security delisted	Jul 26, 2023	AwardD (derivative)	140,000	—	n/a (No price was disclosed in the filing)	SEC
Kezar Life Sciences, Inc.Security delisted	Jul 26, 2023	OtherD (derivative)	-195,000	—	n/a (No price was disclosed in the filing)	SEC
Kezar Life Sciences, Inc.Security delisted	Jul 26, 2023	AwardD (derivative)	60,000	—	n/a (No price was disclosed in the filing)	SEC
Kezar Life Sciences, Inc.Security delisted	Jul 26, 2023	OtherD (derivative)	-60,000	—	n/a (No price was disclosed in the filing)	SEC
Kezar Life Sciences, Inc.Security delisted	Jul 26, 2023	AwardD (derivative)	220,000	—	n/a (No price was disclosed in the filing)	SEC
Kezar Life Sciences, Inc.Security delisted	Jul 26, 2023	AwardD (derivative)	90,000	—	n/a (No price was disclosed in the filing)	SEC
Kezar Life Sciences, Inc.Security delisted	Jul 26, 2023	OtherD (derivative)	-140,000	—	n/a (No price was disclosed in the filing)	SEC
Kezar Life Sciences, Inc.Security delisted	Jul 26, 2023	OtherD (derivative)	-90,000	—	n/a (No price was disclosed in the filing)	SEC

Company	Filed	Type	Qty	Price	Value · USD	Src
Kezar Life Sciences, Inc.Security delisted	May 11, 2026	OtherD (derivative)	-17,793	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))	SEC
Kezar Life Sciences, Inc.Security delisted	May 11, 2026	OtherD (derivative)	-5,999	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))	SEC
Kezar Life Sciences, Inc.Security delisted	May 11, 2026	OtherD (derivative)	-5,999	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))	SEC
Kezar Life Sciences, Inc.Security delisted	May 11, 2026	Other	-200	—	n/a (No price was disclosed in the filing)	SEC
Kezar Life Sciences, Inc.Security delisted	May 11, 2026	OtherD (derivative)	-24,500	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))	SEC
Kezar Life Sciences, Inc.Security delisted	May 11, 2026	OtherD (derivative)	-13,999	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))	SEC
Kezar Life Sciences, Inc.Security delisted	May 11, 2026	OtherD (derivative)	-12,000	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))	SEC
Kezar Life Sciences, Inc.Security delisted	May 11, 2026	OtherD (derivative)	-19,499	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))	SEC
Kezar Life Sciences, Inc.Security delisted	May 11, 2026	Other	-1,538	—	n/a (No price was disclosed in the filing)	SEC
Kezar Life Sciences, Inc.Security delisted	May 11, 2026	OtherD (derivative)	-21,999	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))	SEC
Kezar Life Sciences, Inc.Security delisted	May 11, 2026	OtherD (derivative)	-29,499	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))	SEC
Kezar Life Sciences, Inc.Security delisted	May 11, 2026	OtherD (derivative)	-8,999	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))	SEC
Kezar Life Sciences, Inc.Security delisted	Apr 1, 2025	AwardD (derivative)	4,800	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))	SEC
Kezar Life Sciences, Inc.Security delisted	Mar 5, 2025	AwardD (derivative)	7,200	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))	SEC
Kezar Life Sciences, Inc.Security delisted	Jan 13, 2025	AwardD (derivative)	24,500	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))	SEC
Kezar Life Sciences, Inc.Security delisted	Jan 9, 2024	AwardD (derivative)	295,000	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))	SEC
Kezar Life Sciences, Inc.Security delisted	Jul 26, 2023	OtherD (derivative)	-220,000	—	n/a (No price was disclosed in the filing)	SEC
Kezar Life Sciences, Inc.Security delisted	Jul 26, 2023	AwardD (derivative)	140,000	—	n/a (No price was disclosed in the filing)	SEC
Kezar Life Sciences, Inc.Security delisted	Jul 26, 2023	OtherD (derivative)	-195,000	—	n/a (No price was disclosed in the filing)	SEC
Kezar Life Sciences, Inc.Security delisted	Jul 26, 2023	AwardD (derivative)	60,000	—	n/a (No price was disclosed in the filing)	SEC
Kezar Life Sciences, Inc.Security delisted	Jul 26, 2023	OtherD (derivative)	-60,000	—	n/a (No price was disclosed in the filing)	SEC
Kezar Life Sciences, Inc.Security delisted	Jul 26, 2023	AwardD (derivative)	220,000	—	n/a (No price was disclosed in the filing)	SEC
Kezar Life Sciences, Inc.Security delisted	Jul 26, 2023	AwardD (derivative)	90,000	—	n/a (No price was disclosed in the filing)	SEC
Kezar Life Sciences, Inc.Security delisted	Jul 26, 2023	OtherD (derivative)	-140,000	—	n/a (No price was disclosed in the filing)	SEC
Kezar Life Sciences, Inc.Security delisted	Jul 26, 2023	OtherD (derivative)	-90,000	—	n/a (No price was disclosed in the filing)	SEC