Renaissance Technologies Llc reports 21.26% increase in ownership of ATEC / Alphatec Holdings, Inc.

알파텍 홀딩스, Inc.

US ˙ NasdaqGS ˙ US02081G2012

Security	ATEC / Alphatec Holdings, Inc.
Institution	Renaissance Technologies Llc
Manager	James Simons
Latest Disclosed Ownership	1,055,100 shares
Latest Disclosed Value	$ 11,479,488

On May 14, 2026 - Renaissance Technologies Llc filed a 13F-HR form disclosing ownership of 1,055,100 shares of Alphatec Holdings, Inc. (US:ATEC) valued at $11,479,488 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 870,131 shares of Alphatec Holdings, Inc.. This represents a change in shares of 21.26% during the quarter. The current value of the position is $8,440,800 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	Reported Shares	ΔShares	ΔShares (%)	Reported Value (x1000)	ΔValue (%)	Alloc (%)
2026-05-14	2026-03-31	13F	ALPHATEC HLDGS	COM NEW	02081G201	1,055,100	184,969	21.26	11,479	-37.30	0.0180
2026-02-12	2025-12-31	13F	ALPHATEC HLDGS	COM NEW	02081G201	870,131	-108,869	-11.12	18,308	28.61	0.0284
2025-11-13	2025-09-30	13F	ALPHATEC HLDGS	COM NEW	02081G201	979,000	234,800	31.55	14,235	72.32	0.0188
2025-08-13	2025-06-30	13F	ALPHATEC HLDGS	COM NEW	02081G201	744,200	527,732	243.79	8,261	276.48	0.0110
2025-05-14	2025-03-31	13F	ALPHATEC HLDGS	COM NEW	02081G201	216,468	-75,632	-25.89	2,195	-18.16	0.0033
2025-02-13	2024-12-31	13F	ALPHATEC HLDGS	COM NEW	02081G201	292,100	150,500	106.29	2,681	240.66	0.0040
2024-11-13	2024-09-30	13F	ALPHATEC HLDGS	COM NEW	02081G201	141,600	-145,900	-50.75	787	-73.80	0.0012
2024-08-09	2024-06-30	13F	ALPHATEC HLDGS	COM NEW	02081G201	287,500	-64,900	-18.42	3,004	75,000.00	0.0051
2024-05-13	2024-03-31	13F	ALPHATEC HLDGS	COM NEW	02081G201	352,400	-11,300	-3.11	5	-20.00	0.0076
2024-02-13	2023-12-31	13F	ALPHATEC HLDGS	COM NEW	02081G201	363,700	39,261	12.10	5	25.00	0.0085
2023-11-14	2023-09-30	13F	ALPHATEC HLDGS	COM NEW	02081G201	324,439	-33,061	-9.25	4	-33.33	0.0072
2023-08-11	2023-06-30	13F	ALPHATEC HLDGS	COM NEW	02081G201	357,500	357,500		6		0.0093
2023-02-13	2022-12-31	13F	ALPHATEC HLDGS	COM NEW	02081G201	0	-331,800	-100.00	0	-100.00
2022-11-14	2022-09-30	13F	ALPHATEC HLDGS	COM NEW	02081G201	331,800	-58,900	-15.08	2,900	13.50	0.0041
2022-08-12	2022-06-30	13F	ALPHATEC HLDGS	COM NEW	02081G201	390,700	237,400	154.86	2,555	44.92	0.0030
2022-05-13	2022-03-31	13F	ALPHATEC HLDGS	COM NEW	02081G201	153,300	99,900	187.08	1,763	189.02	0.0021
2022-02-11	2021-12-31	13F	ALPHATEC HLDGS	COM NEW	02081G201	53,400	-17,400	-24.58	610	-29.32	0.0008
2021-11-12	2021-09-30	13F	ALPHATEC HLDGS	COM NEW	02081G201	70,800	-168,800	-70.45	863	-76.49	0.0011
2021-08-13	2021-06-30	13F	ALPHATEC HLDGS	COM NEW	02081G201	239,600	119,800	100.00	3,671	94.03	0.0046
2021-05-13	2021-03-31	13F	ALPHATEC HLDGS	COM NEW	02081G201	119,800	119,800	-50.00	1,892	-48.46	0.0024
2021-02-10	2020-12-31	13F	ALPHATEC HLDGS	COM NEW	02081G201	0	-16,190	-100.00	0	-100.00
2020-11-13	2020-09-30	13F	ALPHATEC HLDGS	COM NEW	02081G201	16,190	-391,999	-96.03	108	-94.37	0.0001
2020-08-13	2020-06-30	13F	ALPHATEC HLDGS	COM NEW	02081G201	408,189	-132,390	-24.49	1,918	2.84	0.0017
2020-05-14	2020-03-31	13F	ALPHATEC HLDGS	COM NEW	02081G201	540,579	81,792	17.83	1,865	-42.70	0.0018
2020-02-13	2019-12-31	13F	ALPHATEC HOLDINGS	COM NEW	02081G201	458,787	48,800	11.90	3,255	58.16	0.0025
2019-11-13	2019-09-30	13F	ALPHATEC HOLDINGS	COM NEW	02081G201	409,987	133,200	48.12	2,058	63.72	0.0017
2019-08-12	2019-06-30	13F	ALPHATEC HOLDINGS	COM NEW	02081G201	276,787	25,000	9.93	1,257	88.46	0.0011
2019-05-14	2019-03-31	13F	ALPHATEC HOLDINGS	COM NEW	02081G201	251,787	-189,600	-42.96	667	-34.03	0.0006
2019-02-12	2018-12-31	13F	ALPHATEC HOLDINGS	COM NEW	02081G201	441,387	-141,758	-24.31	1,011	-48.55	0.0011
2018-11-13	2018-09-30	13F	ALPHATEC HOLDINGS	COM NEW	02081G201	583,145	98,500	20.32	1,965	36.08	0.0020
2018-08-13	2018-06-30	13F/A-1	ALPHATEC HOLDINGS	COM NEW	02081G201	484,645	110,058	29.38	1,444	20.13	0.0016
2018-08-13	2018-06-30	13F	ALPHATEC HOLDINGS	COM NEW	02081G201	374,587			1,202
2018-05-14	2018-03-31	13F	ALPHATEC HOLDINGS	COM NEW	02081G201	374,587	15,500	4.32	1,202	25.86	0.0013
2018-02-13	2017-12-31	13F	ALPHATEC HOLDINGS	COM NEW	02081G201	359,087	33,300	10.22	955	29.76	0.0011
2017-11-13	2017-09-30	13F	ALPHATEC HOLDINGS	COM NEW	02081G201	325,787	8,600	2.71	736	25.38	0.0009
2017-08-11	2017-06-30	13F	ALPHATEC HOLDINGS	COM NEW	02081G201	317,187	16,200	5.38	587	-16.26	0.0007
2017-05-12	2017-03-31	13F	ALPHATEC HOLDINGS	COM NEW	02081G201	300,987	-12,558	-4.01	701	-30.32	0.0010
2017-02-13	2016-12-31	13F	ALPHATEC HOLDINGS	COM NEW	02081G201	313,545	144,300	85.26	1,006	-36.77	0.0016
2016-11-14	2016-09-30	13F	ALPHATEC HOLDINGS	COM NEW	02081G201	169,245	-876,555	-83.82	1,591	334.70	0.0028
2016-08-12	2016-06-30	13F	ALPHATEC HOLDINGS	COM	02081G102	1,045,800	156,800	17.64	366	71.83	0.0007
2016-05-13	2016-03-31	13F	ALPHATEC HOLDINGS	COM	02081G102	889,000	175,400	24.58	213	-0.47	0.0004
2016-02-11	2015-12-31	13F	ALPHATEC HOLDINGS	COM	02081G102	713,600	292,700	69.54	214	53.96	0.0005
2015-11-12	2015-09-30	13F	ALPHATEC HOLDINGS	COM	02081G102	420,900	49,500	13.33	139	-72.90	0.0003
2015-08-14	2015-06-30	13F	ALPHATEC HOLDINGS	COM	02081G102	371,400	45,100	13.82	513	8.46	0.0012
2015-05-13	2015-03-31	13F	ALPHATEC HOLDINGS	COM	02081G102	326,300	43,100	15.22	473	18.55	0.0010
2015-02-13	2014-12-31	13F	ALPHATEC HOLDINGS	COM	02081G102	283,200	26,900	10.50	399	-8.49	0.0010
2014-11-12	2014-09-30	13F	ALPHATEC HOLDINGS	COM	02081G102	256,300	-66,200	-20.53	436	-17.11	0.0012
2014-08-13	2014-06-30	13F	ALPHATEC HOLDINGS	COM	02081G102	322,500	175,400	119.24	526	138.01	0.0012
2014-05-14	2014-03-31	13F	ALPHATEC HOLDINGS	COM	02081G102	147,100	88,800	152.32	221	88.89	0.0005
2014-02-14	2013-12-31	13F	ALPHATEC HOLDINGS	COM	02081G102	58,300	-30,000	-33.98	117	-32.76	0.0003
2013-11-13	2013-09-30	13F	ALPHATEC HOLDINGS	COM	02081G102	88,300	35,200	66.29	174	59.63	0.0004
2013-08-12	2013-06-30	13F	ALPHATEC HOLDINGS	COM	02081G102	53,100	53,100		109		0.0003

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.