Joseph P Platt JR

CNR

Joseph P Platt JR serves as Director at Core Natural Resources, Inc. (CNR). This page tracks their complete SEC Form 4 insider trading history including stock purchases and sales.

Total Buys

1 trades

$64.9K

Total Sells

2 trades

$1.74M

Net Position

Net Seller

$1.67M

Companies Traded

GLRE, CNR

Active Period

May 2022 – Nov 2025

3 total trades

Most Recent

Buy GLRE

Nov 18, 2025 · $64.9K

Joseph P Platt JR's Insider Trading at Core Natural Resources, Inc. (CNR)

Buys

0 · $0.00

Sells

2 · $1.74M

Total Shares Bought

Total Shares Sold

24,404

CNR Price Chart

Loading chart...

Date	Type	Shares	Avg Price	Value	Shares After
Sep 19, 2023↗	Sell	10,227	$98.33	$1.01M	33,957
May 25, 2022↗	Sell	14,177	$51.45	$729.4K	44,637

Joseph P Platt JR's Insider Trading at Greenlight Capital Re, Ltd. (GLRE)

Buys

1 · $64.9K

Sells

0 · $0.00

Total Shares Bought

5,000

Total Shares Sold

GLRE Price Chart

Loading chart...

Date	Type	Shares	Avg Price	Value	Shares After
Nov 18, 2025↗	Buy	5,000	$12.97	$64.9K	0

Related Insiders

John Rothka

officer: Chief Accounting Officer

CNRSell · Mar 10, 2026

NAVARRE RICHARD A

director

CNRSell · Mar 10, 2026

Rosemary L Klein

SVP, CLO & Corp. Sec.

CNRSell · Feb 18, 2026

John Rothka

Chief Accounting Officer

CNRSell · Feb 18, 2026

James A Brock

Executive Chair and CEO

CNRSell · Feb 18, 2026

Robert J. Braithwaite Jr.

SVP, Marketing & Sales

CNRSell · Feb 18, 2026

Kurt R. Salvatori

SVP, Chief Admin. Officer

CNRSell · Feb 18, 2026

George John Schuller JR

SVP, Chief Operating Officer

CNRSell · Feb 18, 2026

Explore More Insider Trading Data

CNR Insider Trading Activity

View all insider trades at Core Natural Resources, Inc.

Energy Sector Insider Trades

See insider activity across energy stocks

Latest Insider Buys

Most recent insider purchases across all stocks

CEO Stock Purchases

Track CEO buying activity