What does CUSIP 03676C100 represent in this 13F holders report?

CUSIP 03676C100 is the security identifier for ATEX - Anterix Inc. - Common Stock used to aggregate holder disclosures.

How many institutions held ATEX - Anterix Inc. - Common Stock in Q1 2026?

131 institutional investors reported ATEX - Anterix Inc. - Common Stock for Q1 2026. Use the holders table for investor-level position and value details.

Anterix Inc. - Common Stock (ATEX)

CUSIP: 03676C100

Q1 2026 13F Holders as of 31 Mar 2026

Type / Class: Equity / Common Stock
Shares outstanding: 18,768,052
Total 13F shares: 16,932,878
Share change: +838,861
Total reported value: $646,461,624
Put/Call ratio: 17%
Price per share: $38.19
Number of holders: 131
Value change: +$54,590,120
Number of buys: 79
Number of sells: 45

Quarterly Holders Quick Answers

What is CUSIP 03676C100?
CUSIP 03676C100 identifies ATEX - Anterix Inc. - Common Stock in SEC institutional holdings data.

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Explore More Reporting Periods

Jump to adjacent filing periods for faster comparison and easier crawl discovery.

Previous quarter: Q4 2025

Recent filing periods for CUSIP 03676C100:

Q1 2026 Q4 2025 Q3 2025 Q2 2025 Q1 2025 Q4 2024 Q3 2024 Q2 2024

Top shareholders of ATEX - Anterix Inc. - Common Stock (13F + 13D/G + 3/4/5)

Grouped by holder across the latest SEC ownership disclosures. Ownership % is shown only when it is directly reported or safely comparable across share classes.

Methodology: rows are grouped by holder and ranked by the holder's primary source value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.

Holder	Source	Role / Reporting	Ownership %	Shares	Holdings Value	12M Net Δ	As of	Details
Jeffrey A. Altman	3/4/5	Director, 10%+ Owner	29%	5,427,192	$130,035,519	—	05 Aug 2025	3/4/5
Owl Creek Asset Management, L.P.	13F	Company	29%	5,411,776	$118,139,070	—	31 Dec 2025	13F
Heard Capital LLC	13D/G 13F	Company	9.4%	1,741,989	$51,528,035	$0	28 Feb 2025	13D/G 13F
William Heard	3/4/5	Director	9.2%	1,726,392	$41,364,351	—	05 Aug 2025	3/4/5
BlackRock, Inc.	13D/G 13F	Company	5%	934,649	$35,694,245	-$618,411	31 Mar 2026	13D/G 13F
VANGUARD GROUP INC	13D/G 13F	The Vanguard Group · Company	5%	931,305	$20,330,854	$0	31 Dec 2025	13D/G 13F
DG Capital Management, LLC	13D/G 13F	Company	4%	744,544	$15,985,360	-$4,963,757	30 Sep 2025	13D/G 13F
QVT Financial LP	13F	Company	2.7%	503,941	$11,001,032	—	31 Dec 2025	13F
Jefferies Financial Group Inc.	13F	Company	2.4%	454,508	$9,921,910	—	31 Dec 2025	13F
MILLENNIUM MANAGEMENT LLC	13F	Company	2.3%	439,946	$9,604,021	—	31 Dec 2025	13F
GAMCO INVESTORS, INC. ET AL	13F	Company	2.3%	422,470	$9,222,520	—	31 Dec 2025	13F
GARNET EQUITY CAPITAL HOLDINGS, INC.	13F	Company	2.1%	397,395	$8,675,133	—	31 Dec 2025	13F
GEODE CAPITAL MANAGEMENT, LLC	13F	Company	1.9%	360,139	$7,863,736	—	31 Dec 2025	13F
STATE STREET CORP	13F	Company	1.8%	333,788	$7,286,592	—	31 Dec 2025	13F
DIMENSIONAL FUND ADVISORS LP	13F	Company	1.7%	324,923	$7,092,536	—	31 Dec 2025	13F
GABELLI FUNDS LLC	13F	Company	1.6%	304,907	$6,656,120	—	31 Dec 2025	13F
MARSHALL WACE, LLP	13F	Company	1.6%	291,255	$6,358,098	—	31 Dec 2025	13F
AYAL Capital Advisors Ltd	13F	Company	1.4%	265,000	$5,784,950	—	31 Dec 2025	13F
Robert Harris Schwartz	3/4/5	President and CEO, Director	— mixed-class rows	243,056 mixed-class rows	$4,349,647	—	23 Aug 2024	3/4/5
Potomac Capital Management, Inc.	13F	Company	0.86%	161,400	$3,523,362	—	31 Dec 2025	13F
JANE STREET GROUP, LLC	13F	Company	0.85%	159,014	$3,471,275	—	31 Dec 2025	13F
Beartown Capital Management, LLC	13F	Company	0.77%	145,000	$3,165,350	—	31 Dec 2025	13F
BANK OF AMERICA CORP /DE/	13F	Company	0.76%	143,124	$3,124,397	—	31 Dec 2025	13F
CHARLES SCHWAB INVESTMENT MANAGEMENT INC	13F	Company	0.74%	138,677	$3,027,319	—	31 Dec 2025	13F
TUDOR INVESTMENT CORP ET AL	13F	Company	0.67%	124,943	$2,727,506	—	31 Dec 2025	13F
Qube Research & Technologies Ltd	13F	Company	0.66%	124,646	$2,721,022	—	31 Dec 2025	13F
GOLDMAN SACHS GROUP INC	13F	Company	0.66%	124,630	$2,720,673	—	31 Dec 2025	13F
NORTHERN TRUST CORP	13F	Company	0.61%	114,262	$2,494,339	—	31 Dec 2025	13F
MORGAN STANLEY	13F	Company	0.58%	109,445	$2,389,185	—	31 Dec 2025	13F
CITADEL ADVISORS LLC	13F	Company	0.58%	108,380	$2,365,935	—	31 Dec 2025	13F
KIRR MARBACH & CO LLC /IN/	13F	Company	0.54%	100,418	$2,192,125	—	31 Dec 2025	13F
Man Group plc	13F	Company	0.53%	100,145	$2,186,165	—	31 Dec 2025	13F
Atom Investors LP	13F	Company	0.44%	83,085	$1,813,746	—	31 Dec 2025	13F
Timothy Gray	3/4/5	Chief Financial Officer	— mixed-class rows	130,513 mixed-class rows	$1,699,875	+$1,104	19 Aug 2025	3/4/5
GSA CAPITAL PARTNERS LLP	13F	Company	0.39%	72,976	$1,593,000	—	31 Dec 2025	13F
Bank of New York Mellon Corp	13F	Company	0.37%	68,792	$1,501,729	—	31 Dec 2025	13F
Leslie B. Daniels	3/4/5	Director	0.33%	61,479	$1,473,036	—	05 Aug 2025	3/4/5
D. E. Shaw & Co., Inc.	13F	Company	0.33%	61,765	$1,348,330	—	31 Dec 2025	13F
Elaine Gangeri	3/4/5	Chief Acc Officer, Treasurer	— class O/S missing	36,646	$1,245,598	—	24 May 2021	3/4/5
Nuveen, LLC	13F	Company	0.28%	53,155	$1,160,374	—	31 Dec 2025	13F
Squarepoint Ops LLC	13F	Company	0.28%	53,117	$1,159,544	—	31 Dec 2025	13F
Teton Advisors, LLC	13F	Company	0.28%	53,000	$1,156,990	—	31 Dec 2025	13F
Waterfront Wealth Inc.	13F	Company	0.26%	48,627	$1,150,053	—	31 Dec 2025	13F
FMR LLC	13F	Company	0.27%	51,044	$1,114,298	—	31 Dec 2025	13F
Schonfeld Strategic Advisors LLC	13F	Company	0.26%	49,462	$1,079,755	—	31 Dec 2025	13F
UBS Group AG	13F	Company	0.26%	48,787	$1,065,020	—	31 Dec 2025	13F
SG Americas Securities, LLC	13F	Company	0.26%	48,509	$1,059,000	—	31 Dec 2025	13F
Christopher Guttman-McCabe	3/4/5	Chief Reg & Comm Officer	— mixed-class rows	96,383 mixed-class rows	$1,027,263	—	12 Jul 2025	3/4/5
Ryan Gerbrandt	3/4/5	Chief Operating Officer	— mixed-class rows	95,853 mixed-class rows	$1,014,569	—	12 Jul 2025	3/4/5
Trexquant Investment LP	13F	Company	0.25%	46,398	$1,012,868	—	31 Dec 2025	13F

Institutional Holders of Anterix Inc. - Common Stock (ATEX) as of Q1 2026

As of 31 Mar 2026, Anterix Inc. - Common Stock (ATEX) was held by 131 institutional shareholders that filed Form 13F with the SEC. Together, they reported ownership of 16,932,878 shares. The largest 10 holders included Owl Creek Asset Management, L.P., Heard Capital LLC, BlackRock, Inc., VANGUARD CAPITAL MANAGEMENT LLC, QVT Financial LP, PLUSTICK MANAGEMENT LLC, GAMCO INVESTORS, INC. ET AL, DIMENSIONAL FUND ADVISORS LP, JANE STREET GROUP, LLC, and STATE STREET CORP. This page lists 131 institutional shareholders reporting positions in this security for the Q1 2026 filing period.

Investor	Option	Weight %	Change %	Value $	* Price	Shares	Share Change	Activity	Report Period

Compare Q1 2026 vs Q4 2025 Across Filers

Q4 2025 holders

116

Q1 2026 holders

131

Holder diff

Investor	Q4 2025 Shares	Q1 2026 Shares	Share Diff	Share Chg %	Q4 2025 Value $	Q1 2026 Value $	Value Diff $	Value Chg %

Trend: ostatnie 8 kwartałów (+ wybrane okresy porównania).

Quarterly Holders Trend

Quarterly Value Trend

Quarterly Shares Trend

* Reported Price is the price of the security as of the portfolio date. This value is significant in that it is the last known price at which the security was still held.
An asterisk sign (*) next to the price indicates that the price is likely invalid.