Sponsel David Insider Trading Activity

Corporate InsiderVP · CIK 1772837

Total trades

$6.6M

Total volume

Mar 11, 2026

Last activity

ATEC

Alphatec Holdings, Inc.

Sponsel David has been net-selling over the last 12 months with 0 purchases and 7 sales across 1 company.

ATEC is the most-traded position with 7 trades. The largest single transaction was a sale of ATEC for $2.1M on Sep 18, 2025.

Performance Scorecard

Forward stock performance after each transaction by Sponsel David. Buy returns measure price movement after open-market purchases; sell-avoided measures the loss avoided after open-market sales. Success rate counts trades where the insider's direction was right.

PERIOD	AVG BUY RETURN	AVG SELL AVOIDED	SUCCESS RATE	TRADES
30 days	—	-3.3%	29%	7
90 days	—	+15.2%	71%	7
120 days	—	+21.3%	71%	7

Performance based on stock price movement after each transaction date. Past results do not predict future returns. Not financial advice.

Price & Trades

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ATEC · Alphatec Holdings, Inc.

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Recent Trades

DATE	TICKER	TYPE	SHARES	PRICE	VALUE	Δ OWNED	ROLE
Mar 11, 2026	ATEC	Sell	163,452	$12.52	$2.0M	−24.5%	VP
Feb 5, 2026	ATEC	Sell	60,425	$13.79	$833K	−14.7%	VP
Dec 10, 2025	ATEC	Sell	21,106	$20.79	$439K	−4.6%	VP
Dec 8, 2025	ATEC	Sell	988	$21.45	$21K	−0.2%	VP
Oct 24, 2025	ATEC	Sell	70,000	$16.18	$1.1M	−13.2%	VP
Sep 19, 2025	ATEC	Sell	2,555	$15.34	$39K	−0.5%	VP
Sep 18, 2025	ATEC	Sell	137,445	$15.09	$2.1M	−20.5%	VP