SEIFERT THOMAS J

Director at Great Wolf Resorts, Inc. · on record since Dec 9, 2024
Chief Financial Officer at Cloudflare, Inc. · on record since Feb 21, 2024
SVP, CFO at ADVANCED MICRO DEVICES INC · on record since Jun 19, 2012
EVP & Chief Financial Officer at Gen Digital Inc. · on record since Mar 19, 2014
Director at IPG PHOTONICS CORP · on record since Jun 4, 2014

Insider trading activity of SEIFERT THOMAS J

Transactions on record: 1,283; since Oct 16, 2009

Open-market buys: 0

Open-market sells: 597; $300.8M

Companies traded: 5; last filing Sep 21, 2026

Figures computed from official regulatory filings — .

Companies where SEIFERT THOMAS J has traded

Cloudflare, Inc.1208 tx · $331.3M · Sep 21, 2026
Great Wolf Resorts, Inc.2 tx · $10K · Feb 3, 2025
IPG PHOTONICS CORP38 tx · $6.6M · May 25, 2022
Gen Digital Inc.9 tx · $477.2K · Jun 14, 2016
ADVANCED MICRO DEVICES INC26 tx · $473K · Jun 19, 2012

Track record of SEIFERT THOMAS J

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

Transaction history of SEIFERT THOMAS J

Co-insiders of SEIFERT THOMAS J

This page republishes public regulatory disclosures.

Company	Filed	Type	Qty	Price	Value · USD	Src
Cloudflare, Inc.Listing on record	Sep 21, 2026	Sell	-100	320.89 USD	$32.1K	SEC
Cloudflare, Inc.Listing on record	Sep 21, 2026	Sell	-100	326.56 USD	$32.7K	SEC
Cloudflare, Inc.Listing on record	Sep 21, 2026	OtherD (derivative)	-10,000	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))	SEC
Cloudflare, Inc.Listing on record	Sep 21, 2026	Sell	-600	335.32 USD	$201.2K	SEC
Cloudflare, Inc.Listing on record	Sep 21, 2026	ExerciseD (derivative)	10,000	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))	SEC
Cloudflare, Inc.Listing on record	Sep 21, 2026	Sell	-1,868	334.59 USD	$625K	SEC
Cloudflare, Inc.Listing on record	Sep 21, 2026	Sell	-1,604	332.50 USD	$533.3K	SEC
Cloudflare, Inc.Listing on record	Sep 21, 2026	ExerciseD (derivative)	-10,000	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))	SEC
Cloudflare, Inc.Listing on record	Sep 21, 2026	Sell	-1,196	331.59 USD	$396.6K	SEC
Cloudflare, Inc.Listing on record	Sep 21, 2026	Sell	-700	330.23 USD	$231.2K	SEC
Cloudflare, Inc.Listing on record	Sep 21, 2026	Sell	-2,632	333.62 USD	$878.1K	SEC
Cloudflare, Inc.Listing on record	Sep 21, 2026	Sell	-300	328.04 USD	$98.4K	SEC
Cloudflare, Inc.Listing on record	Sep 21, 2026	Other	10,000	—	n/a (No price was disclosed in the filing)	SEC
Cloudflare, Inc.Listing on record	Sep 21, 2026	Sell	-100	336.51 USD	$33.7K	SEC
Cloudflare, Inc.Listing on record	Sep 21, 2026	Sell	-100	318.90 USD	$31.9K	SEC
Cloudflare, Inc.Listing on record	Sep 21, 2026	Sell	-700	329.37 USD	$230.6K	SEC
Cloudflare, Inc.Listing on record	Sep 15, 2026	Other	-2,944	327.23 USD	$963.4K	SEC
Cloudflare, Inc.Listing on record	Aug 19, 2026	Sell	-2,944	306.24 USD	$901.6K	SEC
Cloudflare, Inc.Listing on record	Aug 19, 2026	Sell	-100	314.61 USD	$31.5K	SEC
Cloudflare, Inc.Listing on record	Aug 19, 2026	Sell	-3,100	308.23 USD	$955.5K	SEC
Cloudflare, Inc.Listing on record	Aug 19, 2026	ExerciseD (derivative)	10,000	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))	SEC
Cloudflare, Inc.Listing on record	Aug 19, 2026	Sell	-300	309.07 USD	$92.7K	SEC
Cloudflare, Inc.Listing on record	Aug 19, 2026	ExerciseD (derivative)	-10,000	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))	SEC
Cloudflare, Inc.Listing on record	Aug 19, 2026	Sell	-900	305.25 USD	$274.7K	SEC
Cloudflare, Inc.Listing on record	Aug 19, 2026	Other	10,000	—	n/a (No price was disclosed in the filing)	SEC

Company	Filed	Type	Qty	Price	Value · USD	Src
Cloudflare, Inc.Listing on record	Sep 21, 2026	Sell	-100	320.89 USD	$32.1K	SEC
Cloudflare, Inc.Listing on record	Sep 21, 2026	Sell	-100	326.56 USD	$32.7K	SEC
Cloudflare, Inc.Listing on record	Sep 21, 2026	OtherD (derivative)	-10,000	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))	SEC
Cloudflare, Inc.Listing on record	Sep 21, 2026	Sell	-600	335.32 USD	$201.2K	SEC
Cloudflare, Inc.Listing on record	Sep 21, 2026	ExerciseD (derivative)	10,000	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))	SEC
Cloudflare, Inc.Listing on record	Sep 21, 2026	Sell	-1,868	334.59 USD	$625K	SEC
Cloudflare, Inc.Listing on record	Sep 21, 2026	Sell	-1,604	332.50 USD	$533.3K	SEC
Cloudflare, Inc.Listing on record	Sep 21, 2026	ExerciseD (derivative)	-10,000	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))	SEC
Cloudflare, Inc.Listing on record	Sep 21, 2026	Sell	-1,196	331.59 USD	$396.6K	SEC
Cloudflare, Inc.Listing on record	Sep 21, 2026	Sell	-700	330.23 USD	$231.2K	SEC
Cloudflare, Inc.Listing on record	Sep 21, 2026	Sell	-2,632	333.62 USD	$878.1K	SEC
Cloudflare, Inc.Listing on record	Sep 21, 2026	Sell	-300	328.04 USD	$98.4K	SEC
Cloudflare, Inc.Listing on record	Sep 21, 2026	Other	10,000	—	n/a (No price was disclosed in the filing)	SEC
Cloudflare, Inc.Listing on record	Sep 21, 2026	Sell	-100	336.51 USD	$33.7K	SEC
Cloudflare, Inc.Listing on record	Sep 21, 2026	Sell	-100	318.90 USD	$31.9K	SEC
Cloudflare, Inc.Listing on record	Sep 21, 2026	Sell	-700	329.37 USD	$230.6K	SEC
Cloudflare, Inc.Listing on record	Sep 15, 2026	Other	-2,944	327.23 USD	$963.4K	SEC
Cloudflare, Inc.Listing on record	Aug 19, 2026	Sell	-2,944	306.24 USD	$901.6K	SEC
Cloudflare, Inc.Listing on record	Aug 19, 2026	Sell	-100	314.61 USD	$31.5K	SEC
Cloudflare, Inc.Listing on record	Aug 19, 2026	Sell	-3,100	308.23 USD	$955.5K	SEC
Cloudflare, Inc.Listing on record	Aug 19, 2026	ExerciseD (derivative)	10,000	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))	SEC
Cloudflare, Inc.Listing on record	Aug 19, 2026	Sell	-300	309.07 USD	$92.7K	SEC
Cloudflare, Inc.Listing on record	Aug 19, 2026	ExerciseD (derivative)	-10,000	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))	SEC
Cloudflare, Inc.Listing on record	Aug 19, 2026	Sell	-900	305.25 USD	$274.7K	SEC
Cloudflare, Inc.Listing on record	Aug 19, 2026	Other	10,000	—	n/a (No price was disclosed in the filing)	SEC