Demski David M - Insider Non-Derivative Transactions at Alphatec Holdings, Inc. (ATEC) - (SEC)

Updated on January 3, 2026.

According to recent SEC insider information filed on Dec 11, 2025, Demski David M's relationship to Alphatec Holdings, Inc. (ATEC) is Director, and currently has 399,623 shares of Common Stock.

The chart below shows the number of shares owned, and the table shows the recent insider transactions.

You can see similar information for other ATEC insiders.

Related Topics: SEC Topic List.

Data Source: SEC.

Demski David M - Insider Non-Derivative Transactions of ATEC Common Stock

Demski David M - Insider Non-Derivative Transactions at ATEC

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Date	Transaction	No. of Shares	Price Per Share	Shares Owned After Transactions
Dec 12, 2025	Sell -- (Common Stock)	30000	21.2	399623
Jun 12, 2025	Acquisition -- (Common Stock)	15131	0	429623
Dec 19, 2024	Acquisition -- (Common Stock)	126051	0	414492
Aug 22, 2024	P -- (Common Stock)	50000	5.67	288441
Aug 3, 2024	P -- (Common Stock)	40000	6.56	238441
Jun 13, 2024	Acquisition -- (Common Stock)	16747	0	198441
Nov 10, 2023	P -- (Common Stock)	30000	10.5	181694
Oct 18, 2023	Acquisition -- (Common Stock)	7842	0	127842
Oct 18, 2023	Acquisition -- (Common Stock)	23852	0	151694