Thurmond Mark C.

Insider

Co-Chief Executive Officer

Trades at: TENB

30D 90D 1Y

Net shares · 365d

-31.0K

0 buy · 31.0K sell

Net value · 365d

-$937.9K

$0 in · $937.9K out

Sentiment · 365d

Net selling

0% buying · 100% selling

Open-market trades · 365d

0 buy · 31.0K sell

Trading track record · all companies

Running net of open-market buys − sells across every company. Tap the line or a marker for details. ▲ buy · ▼ sell.

Transactions · 365d

Open-market Buys Sells All types

TENB Exercise·M
May 22, 26

Co-Chief Executive Officer

$0

25.4K sh · 6 lots

Own +487%
TENB Other·F
May 22, 26

Co-Chief Executive Officer

$312.2K

12.3K sh · $25.45 avg · 6 lots

Own -6%
TENB Exercise·M
May 22, 26

Co-Chief Executive Officer

$0

25.4K sh · 6 lots

Own +16%
TENB Grant·A
Feb 26, 26

Co-Chief Executive Officer

$0

341.8K sh

Own New
TENB Exercise·M
Feb 25, 26

Co-Chief Executive Officer

$0

24.4K sh

Own +50%
TENB Other·F
Feb 25, 26

Co-Chief Executive Officer

$224.0K

11.8K sh · $19.00

Own -7%
TENB Exercise·M
Feb 25, 26

Co-Chief Executive Officer

$0

24.4K sh

Own +16%
TENB Exercise·M
Feb 23, 26

Co-Chief Executive Officer

$0

63.3K sh · 7 lots

Own New
TENB Other·F
Feb 23, 26

Co-Chief Executive Officer

$373.5K

21.3K sh · $17.55 avg · 7 lots

Own -15%
TENB Exercise·M
Feb 23, 26

Co-Chief Executive Officer

$0

63.3K sh · 7 lots

Own +116%
TENB Exercise·M
Nov 24, 25

Co-Chief Executive Officer

$0

16.7K sh · 6 lots

Own +455%
TENB Other·F
Nov 24, 25

Co-Chief Executive Officer

$207.8K

8.1K sh · $25.68 avg · 6 lots

Own -7%
TENB Exercise·M
Nov 24, 25

Co-Chief Executive Officer

$0

16.7K sh · 6 lots

Own +17%
TENB Sell·S
Aug 26, 25

Co-Chief Executive Officer

$75.8K

2.5K sh · $29.84

Own -2%
TENB Exercise·M
Aug 25, 25

Co-Chief Executive Officer

$0

63.3K sh · 7 lots

Own New
TENB Exercise·M
Aug 25, 25

Co-Chief Executive Officer

$0

63.3K sh · 7 lots

Own +143%
TENB Sell·S
Aug 25, 25

Co-Chief Executive Officer

$862.1K

28.5K sh · $30.25

Own -22%

Date▾	Ticker	Role	Type	Shares	Own Δ	Price	Value
May 22, 2026	TENB	Co-Chief Executive Officer	Exercise M	25.4K6 lots	+487%	—	$0
May 22, 2026	TENB	Co-Chief Executive Officer	Other F	12.3K6 lots	-6%	$25.45 avg	$312.2K
May 22, 2026	TENB	Co-Chief Executive Officer	Exercise M	25.4K6 lots	+16%	—	$0
Feb 26, 2026	TENB	Co-Chief Executive Officer	Grant A	341.8K	New	—	$0
Feb 25, 2026	TENB	Co-Chief Executive Officer	Exercise M	24.4K	+50%	—	$0
Feb 25, 2026	TENB	Co-Chief Executive Officer	Other F	11.8K	-7%	$19.00	$224.0K
Feb 25, 2026	TENB	Co-Chief Executive Officer	Exercise M	24.4K	+16%	—	$0
Feb 23, 2026	TENB	Co-Chief Executive Officer	Exercise M	63.3K7 lots	New	—	$0
Feb 23, 2026	TENB	Co-Chief Executive Officer	Other F	21.3K7 lots	-15%	$17.55 avg	$373.5K
Feb 23, 2026	TENB	Co-Chief Executive Officer	Exercise M	63.3K7 lots	+116%	—	$0
Nov 24, 2025	TENB	Co-Chief Executive Officer	Exercise M	16.7K6 lots	+455%	—	$0
Nov 24, 2025	TENB	Co-Chief Executive Officer	Other F	8.1K6 lots	-7%	$25.68 avg	$207.8K
Nov 24, 2025	TENB	Co-Chief Executive Officer	Exercise M	16.7K6 lots	+17%	—	$0
Aug 26, 2025	TENB	Co-Chief Executive Officer	Sell S	2.5K	-2%	$29.84	$75.8K
Aug 25, 2025	TENB	Co-Chief Executive Officer	Exercise M	63.3K7 lots	New	—	$0
Aug 25, 2025	TENB	Co-Chief Executive Officer	Exercise M	63.3K7 lots	+143%	—	$0
Aug 25, 2025	TENB	Co-Chief Executive Officer	Sell S	28.5K	-22%	$30.25	$862.1K

Buy Sell Non-market (grant · exercise · gift)

About Thurmond Mark C.

This profile aggregates every SEC Form 4 insider transaction reported by Thurmond Mark C. across all companies they trade. Open-market purchases (code P) and sales (code S) are the highest-signal, discretionary trades; grants (A), option exercises (M) and gifts (G) reflect compensation rather than conviction and carry no market price. Figures cover the selected period and update as new filings are ingested.