Platt Joseph P JR

Director at Greenlight Capital Re, Ltd. · on record since May 25, 2007
Director at CONSOL ENERGY INC · on record since May 13, 2016
Director at Core Natural Resources, Inc. · on record since Dec 14, 2017

Insider trading activity of Platt Joseph P JR

Transactions on record: 50; since May 25, 2007

Open-market buys: 2; $115.9K

Open-market sells: 12; $3.2M

Companies traded: 3; last filing Aug 7, 2026

Figures computed from official regulatory filings — .

Companies where Platt Joseph P JR has traded

Greenlight Capital Re, Ltd.33 tx · $1.6M · Aug 7, 2026
Core Natural Resources, Inc.15 tx · $1.7M · Feb 19, 2026
CONSOL ENERGY INC2 tx · May 11, 2017

Track record of Platt Joseph P JR

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

Transaction history of Platt Joseph P JR

Co-insiders of Platt Joseph P JR

Brock James ACONSOL ENERGY INC +1
CARPENTER ALVIN RCONSOL ENERGY INC +1
EINHORN DAVIDCONSOL ENERGY INC +1
Khani David M.CONSOL ENERGY INC +1
MILLS JOHN TCONSOL ENERGY INC +1
POWELL WILLIAM PCONSOL ENERGY INC +1
ROBERSON EDCONSOL ENERGY INC +1
Accurso LauraGreenlight Capital Re, Ltd.
Agbede RobertCONSOL ENERGY INC
Akinkugbe OlayemiCONSOL ENERGY INC
ALTMEYER JAMES ECONSOL ENERGY INC
Archambault StevenGreenlight Capital Re, Ltd.
BAXTER PHILLIP WCONSOL ENERGY INC
Bedard Timothy ScottCONSOL ENERGY INC
Behl NavneetCONSOL ENERGY INC
Belfatti Michael JGreenlight Capital Re, Ltd.
Bergeron SophieCore Natural Resources, Inc.
Braithwaite Robert J. Jr.Core Natural Resources, Inc.
BRENDAN BARRYGreenlight Capital Re, Ltd.

This page republishes public regulatory disclosures.

Company	Filed	Type	Qty	Price	Value · USD	Src
Greenlight Capital Re, Ltd.	Aug 7, 2026	Award	7,992	0.00 USD	—	SEC
Greenlight Capital Re, Ltd.	May 27, 2026	Sell	-11,747	16.87 USD	$198.2K	SEC
Greenlight Capital Re, Ltd.	May 20, 2026	Sell	-23,613	18.01 USD	$425.3K	SEC
Greenlight Capital Re, Ltd.	May 18, 2026	Sell	-12,000	17.50 USD	$210K	SEC
Greenlight Capital Re, Ltd.	May 14, 2026	Sell	-6,820	17.50 USD	$119.4K	SEC
Greenlight Capital Re, Ltd.	May 14, 2026	Sell	-820	17.50 USD	$14.4K	SEC
Core Natural Resources, Inc.	Feb 19, 2026	Award	1,610	0.00 USD	—	SEC
Greenlight Capital Re, Ltd.	Nov 19, 2025	Buy	5,000	12.97 USD	$64.9K	SEC
Greenlight Capital Re, Ltd.	Aug 8, 2025	Award	8,046	—	—	SEC
Core Natural Resources, Inc.	Feb 20, 2025	Award	1,674	0.00 USD	—	SEC
Core Natural Resources, Inc.	Feb 20, 2025	Award	1,674	0.00 USD	—	SEC
Greenlight Capital Re, Ltd.	Aug 12, 2024	Award	8,393	0.00 USD	—	SEC
Core Natural Resources, Inc.	May 9, 2024	Award	1,733	0.00 USD	—	SEC
Core Natural Resources, Inc.	Sep 19, 2023	Sell	-10,227	98.33 USD	$1M	SEC
Greenlight Capital Re, Ltd.	Aug 7, 2023	Award	9,342	0.00 USD	—	SEC
Core Natural Resources, Inc.	May 4, 2023	Award	2,347	0.00 USD	—	SEC
Greenlight Capital Re, Ltd.	Aug 5, 2022	Award	23,427	0.00 USD	—	SEC
Core Natural Resources, Inc.	May 25, 2022	Sell	-11,377	51.34 USD	$584.1K	SEC
Core Natural Resources, Inc.	May 25, 2022	Sell	-2,800	51.90 USD	$145.3K	SEC
Core Natural Resources, Inc.	May 5, 2022	Award	3,062	0.00 USD	—	SEC
Core Natural Resources, Inc.	May 6, 2021	Award	14,177	0.00 USD	—	SEC
Greenlight Capital Re, Ltd.	Nov 12, 2020	Award	14,266	0.00 USD	—	SEC
Core Natural Resources, Inc.	May 12, 2020	Award	20,242	0.00 USD	—	SEC
Core Natural Resources, Inc.	May 13, 2019	Award	4,815	0.00 USD	—	SEC
Greenlight Capital Re, Ltd.	May 13, 2019	Award	16,860	0.00 USD	—	SEC

Company	Filed	Type	Qty	Price	Value · USD	Src
Greenlight Capital Re, Ltd.	Aug 7, 2026	Award	7,992	0.00 USD	—	SEC
Greenlight Capital Re, Ltd.	May 27, 2026	Sell	-11,747	16.87 USD	$198.2K	SEC
Greenlight Capital Re, Ltd.	May 20, 2026	Sell	-23,613	18.01 USD	$425.3K	SEC
Greenlight Capital Re, Ltd.	May 18, 2026	Sell	-12,000	17.50 USD	$210K	SEC
Greenlight Capital Re, Ltd.	May 14, 2026	Sell	-6,820	17.50 USD	$119.4K	SEC
Greenlight Capital Re, Ltd.	May 14, 2026	Sell	-820	17.50 USD	$14.4K	SEC
Core Natural Resources, Inc.	Feb 19, 2026	Award	1,610	0.00 USD	—	SEC
Greenlight Capital Re, Ltd.	Nov 19, 2025	Buy	5,000	12.97 USD	$64.9K	SEC
Greenlight Capital Re, Ltd.	Aug 8, 2025	Award	8,046	—	—	SEC
Core Natural Resources, Inc.	Feb 20, 2025	Award	1,674	0.00 USD	—	SEC
Core Natural Resources, Inc.	Feb 20, 2025	Award	1,674	0.00 USD	—	SEC
Greenlight Capital Re, Ltd.	Aug 12, 2024	Award	8,393	0.00 USD	—	SEC
Core Natural Resources, Inc.	May 9, 2024	Award	1,733	0.00 USD	—	SEC
Core Natural Resources, Inc.	Sep 19, 2023	Sell	-10,227	98.33 USD	$1M	SEC
Greenlight Capital Re, Ltd.	Aug 7, 2023	Award	9,342	0.00 USD	—	SEC
Core Natural Resources, Inc.	May 4, 2023	Award	2,347	0.00 USD	—	SEC
Greenlight Capital Re, Ltd.	Aug 5, 2022	Award	23,427	0.00 USD	—	SEC
Core Natural Resources, Inc.	May 25, 2022	Sell	-11,377	51.34 USD	$584.1K	SEC
Core Natural Resources, Inc.	May 25, 2022	Sell	-2,800	51.90 USD	$145.3K	SEC
Core Natural Resources, Inc.	May 5, 2022	Award	3,062	0.00 USD	—	SEC
Core Natural Resources, Inc.	May 6, 2021	Award	14,177	0.00 USD	—	SEC
Greenlight Capital Re, Ltd.	Nov 12, 2020	Award	14,266	0.00 USD	—	SEC
Core Natural Resources, Inc.	May 12, 2020	Award	20,242	0.00 USD	—	SEC
Core Natural Resources, Inc.	May 13, 2019	Award	4,815	0.00 USD	—	SEC
Greenlight Capital Re, Ltd.	May 13, 2019	Award	16,860	0.00 USD	—	SEC