Alphatec Holdings, Inc.
US ˙ NasdaqGS ˙ US02081G2012

SecurityATEC / Alphatec Holdings, Inc.
InstitutionSei Investments Co
Latest Disclosed Ownership368,765 shares
Latest Disclosed Value $ 7,758,810
Sei Investments Co reports 202.55% increase in ownership of ATEC / Alphatec Holdings, Inc.

On February 13, 2026 - Sei Investments Co filed a 13F-HR form disclosing ownership of 368,765 shares of Alphatec Holdings, Inc. (US:ATEC) valued at $7,758,816 USD as of December 31, 2025. The entity filed a previous 13F-HR on November 13, 2025 disclosing 121,886 shares of Alphatec Holdings, Inc.. This represents a change in shares of 202.55% during the quarter. The current value of the position is $2,832,115 USD.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-02-13 2025-12-31 13F ALPHATEC HLDGS COM NEW 02081G201 368,765 246,879 202.55 7,759 337.81 0.0077
2025-11-13 2025-09-30 13F ALPHATEC HLDGS COM NEW 02081G201 121,886 43,608 55.71 1,772 104.15 0.0019
2025-08-14 2025-06-30 13F ALPHATEC HLDGS COM NEW 02081G201 78,278 16,645 27.01 869 39.10 0.0010
2025-05-14 2025-03-31 13F/A-1 ALPHATEC HLDGS COM NEW 02081G201 61,633 -45,779 -42.62 625 -36.71 0.0008
2025-05-13 2025-03-31 13F ALPHATEC HLDGS COM NEW 02081G201 107,460 48 987 0.0011
2025-02-11 2024-12-31 13F ALPHATEC HLDGS COM NEW 02081G201 107,412 -620 -0.57 986 64.33 0.0013
2024-11-12 2024-09-30 13F ALPHATEC HLDGS COM NEW 02081G201 108,032 -3,428 -3.08 601 -48.45 0.0008
2024-08-13 2024-06-30 13F ALPHATEC HLDGS COM NEW 02081G201 111,460 4,976 4.67 1,165 -20.71 0.0017
2024-05-07 2024-03-31 13F ALPHATEC HLDGS COM NEW 02081G201 106,484 -7,918 -6.92 1,468 -15.05 0.0022
2024-02-14 2023-12-31 13F ALPHATEC HLDGS COM NEW 02081G201 114,402 12,847 12.65 1,729 31.21 0.0028
2023-11-14 2023-09-30 13F ALPHATEC HLDGS COM NEW 02081G201 101,555 -18,746 -15.58 1,317 -39.11 0.0024
2023-08-11 2023-06-30 13F ALPHATEC HLDGS COM NEW 02081G201 120,301 15,629 14.93 2,163 32.54 0.0038
2023-05-12 2023-03-31 13F ALPHATEC HLDGS COM NEW 02081G201 104,672 -3,638 -3.36 1,633 22.06 0.0030
2023-02-10 2022-12-31 13F ALPHATEC HLDGS COM NEW 02081G201 108,310 -1,254 -1.14 1,338 39.56 0.0030
2022-11-14 2022-09-30 13F ALPHATEC HLDGS COM NEW 02081G201 109,564 -7,556 -6.45 958 25.07 0.0021
2022-08-15 2022-06-30 13F ALPHATEC HLDGS COM NEW 02081G201 117,120 -6,178 -5.01 766 -45.98 0.0017
2022-05-13 2022-03-31 13F ALPHATEC HLDGS COM NEW 02081G201 123,298 -2,413 -1.92 1,418 -1.32 0.0029
2022-02-14 2021-12-31 13F ALPHATEC HLDGS COM NEW 02081G201 125,711 20,446 19.42 1,437 12.00 0.0027
2021-11-12 2021-09-30 13F ALPHATEC HLDGS COM NEW 02081G201 105,265 -8,802 -7.72 1,283 -26.60 0.0027
2021-08-06 2021-06-30 13F ALPHATEC HLDGS COM NEW 02081G201 114,067 -56,283 -33.04 1,748 -32.77 0.0039
2021-05-12 2021-03-31 13F ALPHATEC HLDGS COM NEW 02081G201 170,350 99,349 139.93 2,600 152.18 0.0066
2021-02-08 2020-12-31 13F ALPHATEC HLDGS COM NEW 02081G201 71,001 71,001 1,031 0.0027
2020-05-14 2020-03-31 13F ALPHATEC HOLDINGS COM NEW 02081G201 0 -70,420 -100.00 0 -100.00
2020-02-06 2019-12-31 13F ALPHATEC HOLDINGS COM NEW 02081G201 70,420 70,420 500 0.0015
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.