David A. Siegel Alphatec Holdings, Inc. Transaction History

Two Sigma Advisers, LP

$47 Billion
Q3 2025

A detailed history of David A. Siegel (Two Sigma Advisers, LP) transactions in Alphatec Holdings, Inc. stock. As of the latest transaction made, Two Sigma Advisers, LP holds 1,255,500 shares of ATEC stock, worth $24.8 Million. This represents 0.04% of its overall portfolio holdings.

Number of Shares

1,255,500

Previous 757,700 65.7%

Holding current value

$24.8 Million

Previous $8.41 Million 117.05%

% of portfolio

0.04%

Previous 0.02%

23 transactions

Quarter	Operation	Price Per share	shares change	shares Held
Q3 2025 Nov 14, 2025	BUY	$10.31 - $16.55 $5.13 Million - $8.24 Million	497,800 Added 65.7%	1,255,500 $18.3 Million
Q2 2025 Aug 14, 2025	BUY	$9.43 - $13.03 $4.31 Million - $5.95 Million	456,800 Added 151.81%	757,700 $8.41 Million
Q1 2025 May 15, 2025	BUY	$9.06 - $12.53 $1.4 Million - $1.94 Million	155,000 Added 106.24%	300,900 $3.05 Million
Q4 2024 Feb 14, 2025	BUY	$4.98 - $10.48 $310,752 - $653,952	62,400 Added 74.73%	145,900 $1.34 Million
Q3 2024 Nov 14, 2024	BUY	$5.45 - $11.87 $385,860 - $840,396	70,800 Added 557.48%	83,500 $465,000

Q2 2024 Aug 14, 2024	SELL	$9.49 - $14.26 $200,239 - $300,886	-21,100 Reduced 62.43%	12,700 $132,000
Q1 2024 May 15, 2024	SELL	$12.8 - $16.78 $1.34 Million - $1.75 Million	-104,400 Reduced 75.54%	33,800 $466,000
Q4 2023 Feb 14, 2024	SELL	$8.89 - $15.36 $2.93 Million - $5.06 Million	-329,600 Reduced 70.46%	138,200 $2.09 Million
Q3 2023 Nov 14, 2023	SELL	$12.4 - $18.8 $6.24 Million - $9.46 Million	-503,000 Reduced 51.81%	467,800 $6.07 Million
Q2 2023 Aug 14, 2023	BUY	$14.32 - $18.03 $3.05 Million - $3.83 Million	212,700 Added 28.06%	970,800 $17.5 Million
Q1 2023 May 15, 2023	BUY	$11.83 - $16.02 $3.7 Million - $5 Million	312,400 Added 70.09%	758,100 $11.8 Million
Q4 2022 Feb 14, 2023	BUY	$8.91 - $12.35 $3.28 Million - $4.54 Million	367,700 Added 471.41%	445,700 $5.5 Million
Q3 2022 Nov 14, 2022	BUY	$6.57 - $9.74 $427,707 - $634,074	65,100 Added 504.65%	78,000 $682,000
Q2 2022 Aug 15, 2022	BUY	$6.36 - $13.08 $82,044 - $168,732	12,900 New	12,900 $84,000
Q4 2021 Feb 14, 2022	SELL	$10.57 - $13.23 $4.96 Million - $6.21 Million	-469,700 Closed	0 $0
Q3 2021 Nov 15, 2021	SELL	$11.83 - $15.79 $1.3 Million - $1.73 Million	-109,800 Reduced 18.95%	469,700 $5.73 Million
Q2 2021 Aug 16, 2021	BUY	$13.75 - $17.6 $1.77 Million - $2.27 Million	128,700 Added 28.55%	579,500 $8.88 Million
Q1 2021 May 17, 2021	BUY	$13.13 - $18.78 $4.4 Million - $6.29 Million	334,900 Added 288.96%	450,800 $7.12 Million
Q4 2020 Feb 16, 2021	BUY	$6.37 - $14.52 $3,185 - $7,260	500 Added 0.43%	115,900 $1.68 Million
Q3 2020 Nov 16, 2020	SELL	$4.43 - $6.94 $120,938 - $189,462	-27,300 Reduced 19.13%	115,400 $766,000
Q2 2020 Aug 14, 2020	BUY	$3.05 - $5.59 $30,500 - $55,900	10,000 Added 7.54%	142,700 $671,000
Q1 2020 May 15, 2020	BUY	$2.26 - $7.47 $118,649 - $392,175	52,500 Added 65.46%	132,700 $458,000
Q4 2019 Feb 14, 2020	BUY	$4.77 - $7.65 $382,553 - $613,530	80,200 New	80,200 $569,000

Others Institutions Holding ATEC

# of Institutions

309

Shares Held

108M

Call Options Held

7.89M

Put Options Held

1.16M

View Full List

About Alphatec Holdings, Inc.

Ticker ATEC
Exchange NASDAQ
Sector Healthcare
Industry Medical Devices
Shares Outstandng 104,656,000
Market Cap $2.07B
Description
Alphatec Holdings, Inc., a medical technology company, designs, develops, and advances technologies for the surgical treatment of spinal disorders. The company offers SafeOp Neural InformatiX System, an Alpha InformatiX product platform designed to reduce the risk of intraoperative nerve injury; Sigma transforaminal lumbar interbody fusion pedic...

More about ATEC

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