Security key
03676C100
- Security type / class
- Equity / Common Stock
- Total 13F shares
- 16,180,545
- Total 13F value
- $353,310,451
- Share change
- -44,787
- Put/Call ratio
- 343%
- SEC-reported price per share
- $21.83
- Number of holders
- 117
- Value change
- -$761,149
- Number of buys
- 56
- Number of sells
- 61
- Shares outstanding
- 19,593,686
Holder snapshot
7 signals
Open additional details 1 more signal available
Security identity
Names, identifiers, and filing context for this profile.
1 source field
Report period
Q4 2025
Institutions
117
Top holders
10
ATEX full security history
Ownership snapshot
Full 13F holder table
Anterix Inc. SEC filings
Anterix Inc. company facts
Broader feeds
Ownership snapshot
Top reported holders of ATEX - Anterix Inc. - Common Stock (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.
Comparable stake leader
Heard Capital LLC
Disclosed value leader
Jeffrey A. Altman
Comparable rows
15/15
Latest evidence
30 Sep 2025
13D/G
13F
3/4/5
Lead comparable stake: 9.4%
13D/G row: Heard Capital LLC
Showing 1-6 of 15 holder rows.
Quick read
Heard Capital LLC leads the comparable SEC ownership view at 9.4%.
15 of 15 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.
Open SEC evidence
Opens Heard Capital LLC's linked filing trail.
Comparable ownership
Top 5
Heard Capital LLC
9.4%
VANGUARD GROUP INC
5%
DG Capital Management, LLC
4%
Jeffrey A. Altman
28%
William Heard
8.8%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-6 of 15 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| Heard Capital LLC |
13D/G
13F
Company
|
9.4%
|
$51,528,035
1,741,989 shares
|
$0 | 28 Feb 2025 |
| VANGUARD GROUP INC |
13F
13D/G
Company · The Vanguard Group
|
5%
from 13D/G
|
$21,649,854
1,008,377 shares
|
— | 30 Sep 2025 |
| DG Capital Management, LLC |
13F
13D/G
Company
|
4%
from 13D/G
|
$15,985,360
744,544 shares
|
— | 30 Sep 2025 |
| Jeffrey A. Altman |
3/4/5
Director, 10%+ Owner
|
28%
|
$130,035,519
5,427,192 shares
|
— | 05 Aug 2025 |
| William Heard |
3/4/5
Director
|
8.8%
|
$41,364,351
1,726,392 shares
|
— | 05 Aug 2025 |
| Leslie B. Daniels |
3/4/5
Director
|
0.31%
|
$1,473,036
61,479 shares
|
— | 05 Aug 2025 |
How to read this table
Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
13F holder rows
Institutional holders as of Q4 2025
Investor-level positions for this CUSIP, loaded as an interactive table.
Institutions
117
Shares
16,180,545
Rows available
117
| Investor | Option | Weight % | Change % | SEC-reported value | * Price | Shares | Share Change | Activity | Report Period |
|---|
* SEC-reported price is the security price as of the portfolio date and can indicate the last known price at which the security was still held. The marker flags a reported price that did not pass the local price check.
Compare Q4 2025 vs Q3 2025 Across Filers
Q3 2025 holders
110
Q4 2025 holders
117
Holder diff
7
| Investor | Q3 2025 Shares | Q4 2025 Shares | Share Diff | Share Chg % | Q3 2025 value | Q4 2025 value | Value change | Value Chg % |
|---|