David M. Demski

CIK: 0001555392

Transaction Breakdown

Open Market Buys (P)1 (12.5%)

High conviction signal

Open Market Sales (S)1 (12.5%)

Position reduction

Option Exercises (M)0 (0.0%)

Derivative conversions

Awards (A)4 (50.0%)

Compensation grants

Other (G, F, J, C, D, …)2 (25.0%)

Gifts, tax withholding, conversions, dispositions to the issuer and other codes

Companies & Roles (3)

ATEC

Alphatec Holdings, Inc.

Director

FNA

Paragon 28, Inc.

Director

AXNX

Axonics, Inc.

Director

Discretionary Trading P&L

Holdings

Transaction History (8 total)

ATEC
Alphatec Holdings, Inc.
Oct 30, 2026
Purchase(P)
Direct
60K shares at avg. $6.81$409K
ATEC
Alphatec Holdings, Inc.
Jun 10, 2026
Award(A)
Direct
32K shares-
ATEC
Alphatec Holdings, Inc.
Dec 11, 2025
Sale(S)
Direct
30K shares at avg. $21.20$636K
ATEC
Alphatec Holdings, Inc.
Jun 11, 2025
Award(A)
Direct
15.1K shares-
FNA
Paragon 28, Inc.
Apr 21, 2025
Disposition(D)
Direct
74.3K shares-
ATEC
Alphatec Holdings, Inc.
Dec 18, 2024
Award(A)
Direct
126.1K shares-
FNA
Paragon 28, Inc.
Dec 10, 2024
Award(A)
Direct
34.2K shares-
AXNX
Axonics, Inc.
Nov 15, 2024
Disposition(D)
Direct
9.5K shares at avg. $71.00$677K

		Type	Shares	Price		Ownership
Oct 30, 2026	ATEC Alphatec Holdings, Inc.	Purchase(P)	60,000	$6.81	$408,600	Direct
Jun 10, 2026	ATEC Alphatec Holdings, Inc.	Award(A)	32,012	-	$0	Direct
Dec 11, 2025	ATEC Alphatec Holdings, Inc.	Sale(S)	30,000	$21.20	$636,000	Direct
Jun 11, 2025	ATEC Alphatec Holdings, Inc.	Award(A)	15,131	-	-	Direct
Apr 21, 2025	FNA Paragon 28, Inc.	Disposition(D)	74,307	-	-	Direct
Dec 18, 2024	ATEC Alphatec Holdings, Inc.	Award(A)	126,051	-	$0	Direct
Dec 10, 2024	FNA Paragon 28, Inc.	Award(A)	34,207	-	$0	Direct
Nov 15, 2024	AXNX Axonics, Inc.	Disposition(D)	9,542	$71.00	$677,482	Direct

1-8 of 8 transactions

About Demski David M

Demski David M (SEC CIK 0001555392) files insider reports with the SEC as Director of Alphatec Holdings, Inc. (ATEC), Director of Paragon 28, Inc. (FNA) and Director of Axonics, Inc. (AXNX).

Signal8 holds 9 ownership filings by Demski David M (1 Form 3, 8 Form 4), filed between Nov 15, 2024 and Nov 2, 2026. Those filings report 8 transactions, from Nov 15, 2024 to Oct 30, 2026. Signal8's Form 4 history starts in Sep 2024.

The business address on Demski David M's filings is in CARLSBAD, CA.

Recent filings by Demski David M

Oct 30, 2026: Open-market purchase of ATEC shares (Form 4, code P).
Jun 10, 2026: Grant or award of ATEC shares (Form 4, code A).
Dec 11, 2025: Open-market sale of ATEC shares (Form 4, code S).
Jun 11, 2025: Grant or award of ATEC shares (Form 4, code A).
Apr 21, 2025: Disposition to issuer transaction of FNA shares (Form 4, code D).

Other insiders filing for Alphatec Holdings, Inc. (ATEC)

Carls Thomas Andrew, EVP, Data & Imaging Solutions
Miles Patrick, CEO
Marshall Tyson Eliot, GENERAL COUNSEL & CORP. SEC.
MCGINNIS KAREN K, Director
Blackford Quentin S., Director
Valentine Keith, Director

How to read Form 4 transaction codes