David M Demski Alphatec Holdings, Inc. (ATEC) insider trading activity

David M Demski is of Alphatec Holdings, Inc.. Currently has a direct ownership of 399,623 shares of ATEC, which is worth approximately $7.89 Million. The most recent transaction as insider was on Dec 11, 2025, when has been sold 30,000 shares (Common Stock) at a price of $21.2 per share, resulting in proceeds of $636,000. This information was disclosed in a Form 4 filing with the Securities and Exchange Commission (SEC).

Shares Held (Direct Ownership) 400K

6.98% 3M change

3.59% 12M change

Total Value Held $7.89 Million

David M Demski Transaction History

Date	Transaction	Value	Shares Traded	Shares Held
Dec 11 2025	SELL Open market or private sale	$636,000 $21.2 p/Share	30,000 Reduced 6.98%	399,623 Common Stock
Jun 11 2025	BUY Grant, award, or other acquisition	-	15,131 Added 3.4%	429,623 Common Stock
Dec 18 2024	BUY Grant, award, or other acquisition	-	126,051 Added 23.32%	414,492 Common Stock
Aug 21 2024	BUY Open market or private purchase	$283,500 $5.67 p/Share	50,000 Added 14.77%	288,441 Common Stock
Aug 02 2024	BUY Open market or private purchase	$262,400 $6.56 p/Share	40,000 Added 14.37%	238,441 Common Stock
Jun 12 2024	BUY Grant, award, or other acquisition	-	16,747 Added 7.78%	198,441 Common Stock
Nov 09 2023	BUY Open market or private purchase	$315,000 $10.5 p/Share	30,000 Added 14.17%	181,694 Common Stock

Oct 17 2023	BUY Grant, award, or other acquisition	-	31,694 Added 17.28%	151,694 Common Stock

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DMD

David M Demski

Irvine, CA

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