There is a long list of 215 institutional holders of ATEC within the last two holding periods in our database of 13F filers, so we've sorted through to present to you just the top 50 institutional holders of ATEC by largest to smallest position reported in the institutional investor's latest 13F filing. In the institutional-holders-of-ATEC table below, the initial column indicates the name of each top institutional holder of ATEC, with a link to that fund's top holdings. The next columns indicate the amount of ATEC stock held by each of the institutional holders of ATEC, followed by the ATEC position size held by the institution, and finally the date of the quarterly 13F filing period the holdings data represents for that institution.

Holder	Amount	Position Size ($ in 1000's)	As of
BlackRock Inc.		$118,650	12/31/2023
ATEC	7,692,936	$116,240	12/31/2023
NOTE 0	2,283,000	$2,410	12/31/2023
First Light Asset Management LLC	5,976,851	$90,310	12/31/2023
ATEC	5,976,851	$90,310	12/31/2023
Vanguard Group Inc.	5,394,199	$81,506	12/31/2023
ATEC	5,394,199	$81,506	12/31/2023
American Century Companies Inc.	3,564,098	$53,854	12/31/2023
ATEC	3,564,098	$53,854	12/31/2023
Alyeska Investment Group L.P.	3,116,687	$47,093	12/31/2023
ATEC	3,116,687	$47,093	12/31/2023
Linden Advisors LP		$45,304	12/31/2023
SDBCV	42,750,000	$45,304	12/31/2023
Point72 Asset Management L.P.	2,996,794	$45,282	12/31/2023
ATEC	2,996,794	$45,282	12/31/2023
JPMorgan Chase & Co.	2,798,061	$42,279	12/31/2023
ATEC	2,798,061	$42,279	12/31/2023
Citadel Advisors LLC		$40,641	12/31/2023
ATEC	2,346,824	$35,461	12/31/2023
Call	365,200	$5,518	12/31/2023
Put	22,400	$338	12/31/2023
Driehaus Capital Management LLC	2,606,119	$39,378	12/31/2023
ATEC	2,606,119	$39,378	12/31/2023
Millennium Management LLC	2,521,023	$38,093	12/31/2023
ATEC	2,521,023	$38,093	12/31/2023
Nuveen Asset Management LLC		$36,512	12/31/2023
ATEC	2,257,675	$35,980	12/31/2023
NOTE 0	5,000,000	$532	12/31/2023
State Street Corp	2,400,425	$36,270	12/31/2023
ATEC	2,400,425	$36,270	12/31/2023
Morgan Stanley		$34,990	12/31/2023
ATEC	2,250,993	$34,013	12/31/2023
NOTE 0	928,000	$977	12/31/2023
DeepCurrents Investment Group LLC		$34,981	12/31/2023
NOTE 0	33,000,000	$34,981	12/31/2023
Fred Alger Management LLC	2,231,091	$33,712	12/31/2023
ATEC	2,231,091	$33,712	12/31/2023
Slate Path Capital LP	2,155,000	$32,562	12/31/2023
ATEC	2,155,000	$32,562	12/31/2023
Geode Capital Management LLC	2,120,801	$32,049	12/31/2023
ATEC	2,120,801	$32,049	12/31/2023
Next Century Growth Investors LLC	1,975,069	$29,843	12/31/2023
ATEC	1,975,069	$29,843	12/31/2023
Cerity Partners LLC	1,882,908	$28,451	12/31/2023
ATEC	1,882,908	$28,451	12/31/2023
Context Capital Management LLC		$26,512	12/31/2023
NOTE 0	25,000,000	$26,512	12/31/2023
Royal Bank of Canada	1,608,260	$24,301	12/31/2023
ATEC	1,608,260	$24,301	12/31/2023
Oberweis Asset Management Inc.	1,607,820	$24,294	12/31/2023
ATEC	1,607,820	$24,294	12/31/2023
Intrinsic Edge Capital Management LLC	1,599,849	$24,174	12/31/2023
ATEC	1,599,849	$24,174	12/31/2023
Walleye Capital LLC	1,564,751	$23,643	12/31/2023
ATEC	1,564,751	$23,643	12/31/2023
Goldman Sachs Group Inc.	1,451,499	$21,932	12/31/2023
ATEC	1,451,499	$21,932	12/31/2023
BNP PARIBAS ASSET MANAGEMENT Holding S.A.	1,435,020	$21,683	12/31/2023
ATEC	1,435,020	$21,683	12/31/2023
Calamos Advisors LLC		$21,566	12/31/2023
NOTE 0	17,845,000	$18,926	12/31/2023
ATEC	174,711	$2,640	12/31/2023
Janus Henderson Group PLC	1,419,693	$21,452	12/31/2023
ATEC	1,419,693	$21,452	12/31/2023
Artisan Partners Limited Partnership	1,260,787	$19,050	12/31/2023
ATEC	1,260,787	$19,050	12/31/2023
Standard Life Aberdeen plc	1,245,096	$18,813	12/31/2023
ATEC	1,245,096	$18,813	12/31/2023
Penn Capital Management Co. Inc.	1,215,594	$18,424	12/31/2023
ATEC	1,215,594	$18,424	12/31/2023
Parkwood LLC	1,200,000	$18,132	12/31/2023
ATEC	1,200,000	$18,132	12/31/2023
Deutsche Bank AG	1,018,660	$15,392	12/31/2023
ATEC	1,018,660	$15,392	12/31/2023
King Luther Capital Management Corp	919,070	$13,887	12/31/2023
ATEC	919,070	$13,887	12/31/2023
Northern Trust Corp	878,039	$13,267	12/31/2023
ATEC	878,039	$13,267	12/31/2023
Verition Fund Management LLC		$12,447	12/31/2023
NOTE 0	10,399	$11,028	12/31/2023
ATEC	93,930	$1,419	12/31/2023
New York State Common Retirement Fund	814,815	$12,312	12/31/2023
ATEC	814,815	$12,312	12/31/2023
Charles Schwab Investment Management Inc.	746,781	$11,284	12/31/2023
ATEC	746,781	$11,284	12/31/2023
Pier Capital LLC	641,751	$9,697	12/31/2023
ATEC	641,751	$9,697	12/31/2023
Squarepoint Ops LLC	585,196	$8,842	12/31/2023
ATEC	585,196	$8,842	12/31/2023
Captrust Financial Advisors	565,991	$8,552	12/31/2023
ATEC	565,991	$8,552	12/31/2023
Royce & Associates LP	523,822	$7,915	12/31/2023
ATEC	523,822	$7,915	12/31/2023
Connor Clark & Lunn Investment Management Ltd.	521,884	$7,886	12/31/2023
ATEC	521,884	$7,886	12/31/2023
Emerald Advisers LLC	485,772	$7,340	12/31/2023
ATEC	485,772	$7,340	12/31/2023
Emerald Mutual Fund Advisers Trust	396,729	$5,995	12/31/2023
ATEC	396,729	$5,995	12/31/2023
Norden Group LLC	433,764	$5,982	03/31/2024
ATEC	433,764	$5,982	03/31/2024
Russell Investments Group Ltd.	392,472	$5,930	12/31/2023
ATEC	392,472	$5,930	12/31/2023
Susquehanna International Group LLP		$5,781	12/31/2023
Call	355,000	$5,364	12/31/2023
ATEC	55,559	$839	12/31/2023
Put	27,900	$422	12/31/2023
Renaissance Technologies LLC	363,700	$5,496	12/31/2023
ATEC	363,700	$5,496	12/31/2023