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ATEX · Anterix Inc. · Shareholders & Ownership

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$73.16 -3.61 (-4.70%)
Market Cap
$1.38B
Shares
19.61M
Volume · Oct 22 352.74K Avg daily vol (3M) 309.9K

Every disclosed holder of ATEX in one list: 13F institutions, Schedule 13D and 13G filers, insiders (Forms 3, 4 and 5) and registered funds, each from its own latest filing. Holders nest by CIK and SEC reporting links, never by name, and each is summed once.

Who Owns ATEX

13F quarter Sep 30, 2026, combined view: filers that have not filed yet carry their Jun 30, 2026 positions

No chart: the summed disclosures exceed shares outstanding, so they are not parts of one whole.

Holder group Shares % Out
Institutional (13F) 19,021,877 97.00%
Insiders (Forms 3, 4, 5) 371,231 1.89%
13D/G-only blocks 744,544 3.80%
Remaining 527,866 -2.69%
Registered funds (N-PORT, not summed) 6,264,530 31.95%

Shares outstanding: 19,609,786, the issuer's latest cover-page count restated onto today's split basis.

Remaining is negative: the summed disclosures exceed shares outstanding, as when filings are dated at different times or holders that do not disclose their links count the same shares. It is flagged, not clipped.

13D/G-only counts each filer's latest 13D or 13G that no 13F report of the listing contains, that names no 13F filer and that no counted insider files. Funds are never summed: their shares sit inside their advisers' 13F reports.

Holders of ATEX

# Holder Shares
1
ALTMAN JEFFREY A
Insider CIK 1269751 · Aug 4, 2026
Director, 10% Owner, issuer-wide, not summed
5,553,282
2
Owl Creek Asset Management, L.P.
13F CIK 1313756 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
5,411,776
3
T. Rowe Price Investment Management, Inc.
13F CIK 1897612 · Investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
2,348,019
3.1
T. Rowe Price Investment Management, Inc.
13G CIK 1897612 · Investment adviser · Jun 30, 2026
Rule 13d-1(b), qualified institution, not summed
2,348,019
4
Heard Capital LLC
13F CIK 1796409 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
1,716,738
5
Heard William
Insider CIK 2035875 · Aug 19, 2026
Director, issuer-wide, not summed
1,674,303
6
BlackRock, Inc.
13F CIK 2012383 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
1,075,115
6.1
BlackRock, Inc.
13G CIK 2012383 · Holding company · Jun 30, 2026
Rule 13d-1(b), qualified institution, not summed
999,278
6.2
iShares Russell 2000 ETF
Fund S000004344 · Registered fund · Jun 30, 2026
iShares Trust, not summed
298,050
6.3
iShares Russell 2000 Growth ETF
Fund S000004343 · Registered fund · Jun 30, 2026
iShares Trust, not summed
107,877
6.4
iShares Micro-Cap ETF
Fund S000004439 · Registered fund · Jun 30, 2026
iShares Trust, not summed
38,466
6.5
iShares Core S&P Total U.S. Stock Market ETF
Fund S000004317 · Registered fund · Jun 30, 2026
iShares Trust, not summed
25,722
7
PRICE T ROWE ASSOCIATES INC /MD/
13F CIK 80255 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
750,451
7.1
T. Rowe Price Small-Cap Stock Fund, Inc.
Fund S000002120 · Registered fund · Jun 30, 2026
T. ROWE PRICE SMALL-CAP STOCK FUND, INC., not summed
725,484
7.2
T. Rowe Price New Horizons Fund, Inc.
Fund S000002106 · Registered fund · Jun 30, 2026
T. ROWE PRICE NEW HORIZONS FUND, INC., not summed
470,800
7.3
T. Rowe Price Institutional Small-Cap Stock Fund
Fund S000002094 · Registered fund · Jun 30, 2026
T. Rowe Price Equity Funds, Inc., not summed
386,817
7.4
T. Rowe Price Small-Cap Value Fund, Inc.
Fund S000002121 · Registered fund · Jun 30, 2026
T. ROWE PRICE SMALL-CAP VALUE FUND, INC., not summed
237,988
7.5
T. Rowe Price Spectrum Moderate Growth Allocation Fund
Fund S000002138 · Registered fund · May 31, 2026
T. ROWE PRICE SPECTRUM FUNDS II, INC., not summed
10,047
8
DG Capital Management, LLC
13G CIK 1512716 · Registered investment adviser · Sep 30, 2025
Rule 13d-1(b), qualified institution
744,544
9
Jupiter Topco LLC
13F CIK 2146052 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
662,415
9.1
Janus Henderson Small/Mid Cap Growth Alpha ETF
Fund S000052564 · Registered fund · Jul 31, 2026
Janus Detroit Street Trust, not summed
66,695
9.2
Janus Henderson Small Cap Growth Alpha ETF
Fund S000052563 · Registered fund · Jul 31, 2026
Janus Detroit Street Trust, not summed
26,503
10
Janus Henderson Contrarian Fund
Fund S000010475 · Registered fund · Jun 30, 2026
Janus Investment Fund, not summed
634,831
11
VANGUARD CAPITAL MANAGEMENT LLC
13F CIK 2100119 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
553,002
12
PLUSTICK MANAGEMENT LLC
13F CIK 1643351 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
520,000
13
STATE STREET CORP
13F CIK 93751 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
495,950
13.1
State Street(R) SPDR(R) S&P(R) Telecom ETF
Fund S000012323 · Registered fund · Jun 30, 2026
SPDR SERIES TRUST, not summed
220,656
13.2
STATE STREET SMALL/MID CAP EQUITY INDEX PORTFOLIO
Fund S000050332 · Registered fund · Jun 30, 2026
STATE STREET INSTITUTIONAL INVESTMENT TRUST, not summed
4,007
13.3
State Street Total Return V.I.S. Fund
Fund S000001637 · Registered fund · Jun 30, 2026
STATE STREET VARIABLE INSURANCE SERIES FUNDS INC, not summed
290
13.4
State Street Balanced Index Fund
Fund S000082802 · Registered fund · Jun 30, 2026
STATE STREET INSTITUTIONAL INVESTMENT TRUST, not summed
123
14
GAMCO INVESTORS, INC. ET AL
13F CIK 807249 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
415,520
15
GEODE CAPITAL MANAGEMENT, LLC
13F CIK 1214717 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
388,076
16
QVT Financial LP
13F CIK 1290162 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
383,941
17
DIMENSIONAL FUND ADVISORS LP
13F CIK 354204 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
370,964
17.1
U.S. SMALL CAP PORTFOLIO
Fund S000000971 · Registered fund · Jul 31, 2026
DFA INVESTMENT DIMENSIONS GROUP INC, not summed
77,280
17.2
Dimensional U.S. Small Cap ETF
Fund S000070906 · Registered fund · Jul 31, 2026
Dimensional ETF Trust, not summed
67,230
17.3
U.S. MICRO CAP PORTFOLIO
Fund S000000948 · Registered fund · Jul 31, 2026
DFA INVESTMENT DIMENSIONS GROUP INC, not summed
61,317
17.4
Dimensional U.S. Core Equity 2 ETF
Fund S000070903 · Registered fund · Jul 31, 2026
Dimensional ETF Trust, not summed
29,123
17.5
U.S. CORE EQUITY 2 PORTFOLIO
Fund S000000980 · Registered fund · Jul 31, 2026
DFA INVESTMENT DIMENSIONS GROUP INC, not summed
18,714
18
FMR LLC
13F CIK 315066 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
370,400
18.1
Fidelity Small Cap Index Fund
Fund S000033638 · Registered fund · Jul 31, 2026
Fidelity Salem Street Trust, not summed
125,779
18.2
Select Wireless Portfolio
Fund S000007489 · Registered fund · May 31, 2026
Fidelity Select Portfolios, not summed
101,600
18.3
Select Telecommunications Portfolio
Fund S000007485 · Registered fund · May 31, 2026
Fidelity Select Portfolios, not summed
97,200
18.4
Fidelity Extended Market Index Fund
Fund S000006021 · Registered fund · May 31, 2026
Fidelity Concord Street Trust, not summed
96,780
18.5
Fidelity Telecom and Utilities Fund
Fund S000039312 · Registered fund · Jul 31, 2026
Fidelity Select Portfolios, not summed
73,000
19
VANGUARD TOTAL STOCK MARKET INDEX FUND
Fund S000002848 · Registered fund · Jun 30, 2026
VANGUARD INDEX FUNDS, not summed
327,993
20
GABELLI FUNDS LLC
13F CIK 1081407 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
278,500
20.1
Gabelli Global Content & Connectivity Fund
Fund S000001067 · Registered fund · Jun 30, 2026
GAMCO Global Series Funds, Inc, not summed
70,000
20.2
Keeley Small Cap Fund
Fund S000001085 · Registered fund · Jun 30, 2026
Teton Westwood Funds, not summed
50,000
20.3
The Gabelli Utilities Fund
Fund S000001075 · Registered fund · Jun 30, 2026
Gabelli Utilities Fund, not summed
31,000
20.4
Gabelli Global Mini Mites Fund
Fund S000063160 · Registered fund · Jun 30, 2026
GAMCO Global Series Funds, Inc, not summed
5,000
20.5
The Gabelli Asset Fund
Fund S000001087 · Registered fund · Jun 30, 2026
Gabelli Asset Fund, not summed
4,500
21
1290 VT GAMCO Small Company Value Portfolio
Fund S000009151 · Registered fund · Jun 30, 2026
EQ Advisors Trust, not summed
262,000
22
VANGUARD EXTENDED MARKET INDEX FUND
Fund S000002841 · Registered fund · Jun 30, 2026
VANGUARD INDEX FUNDS, not summed
214,766
23
Invesco Ltd.
13F CIK 914208 · Investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
200,975
23.1
Invesco Dorsey Wright Technology Momentum ETF
Fund S000013110 · Registered fund · Jul 31, 2026
Invesco Exchange-Traded Fund Trust, not summed
160,831
23.2
Invesco Russell 2000 Dynamic Multifactor ETF
Fund S000064608 · Registered fund · May 31, 2026
Invesco Exchange-Traded Self-Indexed Fund Trust, not summed
773
24
VANGUARD PORTFOLIO MANAGEMENT LLC
13F CIK 2100121 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
158,469
25
GARNET EQUITY CAPITAL HOLDINGS, INC.
13F CIK 1423876 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
156,119
26
Potomac Capital Management, Inc.
13F CIK 1418746 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
155,071
27
Panoramic Capital, LLC
13F CIK 1950490 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
154,377
28
GOLDMAN SACHS GROUP INC
13F CIK 886982 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
139,334
28.1
Goldman Sachs Absolute Return Tracker Fund
Fund S000020314 · Registered fund · Jun 30, 2026
GOLDMAN SACHS TRUST, not summed
2,929
29
CHARLES SCHWAB INVESTMENT MANAGEMENT INC
13F CIK 884546 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
139,278
29.1
Schwab U.S. Small-Cap ETF
Fund S000026636 · Registered fund · May 31, 2026
SCHWAB STRATEGIC TRUST, not summed
90,919
29.2
Schwab Small-Cap Index Fund
Fund S000005912 · Registered fund · Jul 31, 2026
SCHWAB CAPITAL TRUST, not summed
27,916
29.3
Schwab U.S. Broad Market ETF
Fund S000026631 · Registered fund · May 31, 2026
SCHWAB STRATEGIC TRUST, not summed
11,166
29.4
Schwab Total Stock Market Index Fund
Fund S000005913 · Registered fund · Jul 31, 2026
SCHWAB CAPITAL TRUST, not summed
10,260
30
BANK OF AMERICA CORP /DE/
13F CIK 70858 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
134,686
31
NORTHERN TRUST CORP
13F CIK 73124 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
123,231
31.1
Small Cap Index Fund
Fund S000001245 · Registered fund · Jun 30, 2026
Northern Funds, not summed
5,813
31.2
Small Cap Core Fund
Fund S000001244 · Registered fund · Jun 30, 2026
Northern Funds, not summed
5,005
32
VANGUARD FIDUCIARY TRUST CO
13F CIK 933478 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
120,999
33
KIRR MARBACH & CO LLC /IN/
13F CIK 764112 · Unknown · Sep 30, 2026
116,554
34
D. E. Shaw & Co., Inc.
13F CIK 1009207 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
92,990
35
MORGAN STANLEY
13F CIK 895421 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
80,425
35.1
E*TRADE No Fee Total Market Index Fund
Fund S000090722 · Registered fund · Jul 31, 2026
E Trade Trust, not summed
139
36
Gray Timothy
Insider CIK 1629762 · Aug 19, 2025
Chief Financial Officer, issuer-wide
77,022
37
Beartown Capital Management, LLC
13F CIK 1877162 · Exempt reporting adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
75,000
38
Granahan Investment Management, LLC
13F CIK 1026710 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
72,121
39
Bank of New York Mellon Corp
13F CIK 1390777 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
69,374
40
Marble Bar Asset Management LLP
13F CIK 1346570 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
68,248
41
683 Capital Management, LLC
13F CIK 1404574 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
66,000
42
CITIGROUP INC
13F CIK 831001 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
59,998
43
VANGUARD RUSSELL 2000 INDEX FUND
Fund S000030003 · Registered fund · May 31, 2026
VANGUARD SCOTTSDALE FUNDS, not summed
57,887
44
Trexquant Investment LP
13F CIK 1633445 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
53,423
45
TD Asset Management Inc
13F CIK 1056053 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
53,258
46
Informed Momentum Co LLC
13F CIK 1510989 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
52,534
47
DANIELS LESLIE B
Insider CIK 1052559 · Sep 10, 2026
Director, issuer-wide
50,477
48
Potrero Capital Research LLC
13F CIK 1536630 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
46,525
49
Guttman-McCabe Christopher
Insider CIK 1828490 · Aug 25, 2026
Chief Reg & Comm Officer, issuer-wide
44,876
50
Teton Advisors, LLC
13F CIK 2086025 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
43,000

33 more nested rows are not shown here; Every filing lists them all.

Shares are restated onto today's split basis. Change compares each row with the same holder's previous filing in the same source; a dash means there is none to compare. Nested 13D/G, insider and fund rows are not summed, since a 13F report already holds them.

Showing 1–50 of 266 holders

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Key facts CIK 1304492 CUSIP 03676C100 13F (30d) 15 filings 15 filers Visit website Investor relations