Joshua T. Mook Hyliion Holdings Corp. (HYLN) insider trading activity

Joshua T. Mook is Chief Technology Officer of Hyliion Holdings Corp.. Currently has a direct ownership of 1.03 Million shares of HYLN, which is worth approximately $1.76 Million. The most recent transaction as insider was on Dec 12, 2025, when has been sold 12,949 shares (Common Stock) at a price of $1.94 per share, resulting in proceeds of $25,121. This information was disclosed in a Form 4 filing with the Securities and Exchange Commission (SEC).

Shares Held (Direct Ownership) 1.03M

98.93% 3M change

123.45% 12M change

Total Value Held $1.76 Million

JOSHUA T. MOOK Transaction History

Date	Transaction	Value	Shares Traded	Shares Held
Dec 12 2025	SELL Other acquisition or disposition	$25,121 $1.94 p/Share	12,949 Reduced 1.24%	1,033,803 Common Stock
Nov 27 2025	SELL Payment of exercise price or tax liability	$2,517 $1.85 p/Share	1,361 Reduced 0.13%	1,046,752 Common Stock
Nov 26 2025	BUY Grant, award, or other acquisition	$1,000,000 $1.85 p/Share	540,541 Added 34.03%	1,048,113 Common Stock
Nov 17 2025	SELL Other acquisition or disposition	$15,004 $1.66 p/Share	9,039 Reduced 1.75%	507,572 Common Stock
Nov 14 2025	SELL Payment of exercise price or tax liability	$12,574 $1.7 p/Share	7,397 Reduced 1.41%	516,611 Common Stock
Nov 13 2025	SELL Payment of exercise price or tax liability	$6,904 $1.68 p/Share	4,110 Reduced 0.78%	524,008 Common Stock
Aug 27 2025	SELL Payment of exercise price or tax liability	$2,300 $1.69 p/Share	1,361 Reduced 0.26%	519,688 Common Stock

Aug 25 2025	SELL Payment of exercise price or tax liability	$14,921 $1.77 p/Share	8,430 Reduced 1.59%	521,049 Common Stock
May 27 2025	SELL Payment of exercise price or tax liability	$1,551 $1.14 p/Share	1,361 Reduced 0.26%	529,479 Common Stock
May 13 2025	SELL Payment of exercise price or tax liability	$7,850 $1.91 p/Share	4,110 Reduced 0.77%	530,840 Common Stock
Feb 27 2025	SELL Payment of exercise price or tax liability	$2,191 $1.61 p/Share	1,361 Reduced 0.25%	534,950 Common Stock
Feb 18 2025	BUY Grant, award, or other acquisition	-	93,302 Added 14.82%	536,311 Common Stock
Feb 13 2025	SELL Payment of exercise price or tax liability	$42,042 $2.14 p/Share	19,646 Reduced 4.25%	443,009 Common Stock
Dec 11 2024	BUY Conversion of derivative security	-	101,250 Added 17.96%	462,655 Common Stock
Nov 14 2024	BUY Conversion of derivative security	-	60,750 Added 14.39%	361,405 Common Stock
Aug 27 2024	SELL Payment of exercise price or tax liability	$2,640 $1.94 p/Share	1,361 Reduced 0.45%	300,655 Common Stock
Aug 13 2024	BUY Conversion of derivative security	-	40,500 Added 11.82%	302,016 Common Stock
May 27 2024	SELL Payment of exercise price or tax liability	$2,055 $1.51 p/Share	1,361 Reduced 0.52%	261,516 Common Stock
Feb 27 2024	SELL Payment of exercise price or tax liability	$10,398 $1.57 p/Share	6,623 Reduced 2.46%	262,877 Common Stock
Feb 13 2024	BUY Grant, award, or other acquisition	-	202,500 Added 42.9%	269,500 Common Stock

JTM

Joshua T. Mook

Chief Technology Officer

Cedar Park, TX

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