Anterix Inc.
US ˙ NasdaqCM ˙ US03676C1009

SecurityATEX / Anterix Inc.
InstitutionDimensional Fund Advisors Lp
Latest Disclosed Ownership424,856 shares
Latest Disclosed Value $ 16,222,641
Dimensional Fund Advisors Lp reports 30.76% increase in ownership of ATEX / Anterix Inc.

On May 7, 2026 - Dimensional Fund Advisors Lp filed a 13F-HR form disclosing ownership of 424,856 shares of Anterix Inc. (US:ATEX) valued at $16,225,251 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 324,923 shares of Anterix Inc.. This represents a change in shares of 30.76% during the quarter. The current value of the position is $28,312,404 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 Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-05-07 2026-03-31 13F ANTERIX COM 03676C100 424,856 99,933 30.76 16,223 128.74 0.0007
2026-02-12 2025-12-31 13F ANTERIX COM 03676C100 324,923 13,633 4.38 7,093 6.12 0.0015
2025-11-12 2025-09-30 13F ANTERIX COM 03676C100 311,290 -25,997 -7.71 6,684 -22.75 0.0014
2025-08-12 2025-06-30 13F ANTERIX COM 03676C100 337,287 -8,788 -2.54 8,652 -31.69 0.0020
2025-05-13 2025-03-31 13F ANTERIX COM 03676C100 346,075 -43,518 -11.17 12,665 6.00 0.0031
2025-02-13 2024-12-31 13F ANTERIX COM 03676C100 389,593 -12,497 -3.11 11,949 -21.10 0.0029
2024-11-07 2024-09-30 13F ANTERIX COM 03676C100 402,090 9,537 2.43 15,143 -2.54 0.0037
2024-08-09 2024-06-30 13F ANTERIX COM 03676C100 392,553 -19,047 -4.63 15,538 12.32 0.0041
2024-05-10 2024-03-31 13F ANTERIX COM 03676C100 411,600 6,251 1.54 13,834 2.42 0.0037
2024-02-07 2023-12-31 13F ANTERIX COM 03676C100 405,349 9,292 2.35 13,506 8.67 0.0039
2023-11-09 2023-09-30 13F ANTERIX COM 03676C100 396,057 21,058 5.62 12,428 4.59 0.0041
2023-08-09 2023-06-30 13F ANTERIX COM 03676C100 374,999 44,064 13.32 11,884 8.70 0.0038
2023-05-12 2023-03-31 13F ANTERIX COM 03676C100 330,935 40,061 13.77 10,933 121,366.67 0.0037
2023-02-09 2022-12-31 13F ANTERIX COM 03676C100 290,874 -13,337 -4.38 9 -99.92 0.0028
2022-11-10 2022-09-30 13F ANTERIX COM 03676C100 304,211 -27,355 -8.25 10,866 -20.20 0.0042
2022-08-12 2022-06-30 13F ANTERIX COM 03676C100 331,566 -1,663 -0.50 13,616 -29.43 0.0049
2022-05-13 2022-03-31 13F ANTERIX COM 03676C100 333,229 3,838 1.17 19,294 -0.32 0.0059
2022-02-09 2021-12-31 13F ANTERIX COM 03676C100 329,391 10,611 3.33 19,355 0.03 0.0059
2021-11-12 2021-09-30 13F ANTERIX COM 03676C100 318,780 28,104 9.67 19,350 10.97 0.0062
2021-08-12 2021-06-30 13F ANTERIX COM 03676C100 290,676 21,669 8.06 17,437 37.39 0.0055
2021-05-14 2021-03-31 13F ANTERIX COM 03676C100 269,007 -12,573 -4.47 12,692 19.88 0.0042
2021-03-08 2020-12-31 13F/A-2 ANTERIX COM 03676C100 281,580 -9,728 -3.34 10,587 11.10 0.0038
2021-02-11 2020-12-31 13F ANTERIX COM 03676C100 281,580 -9,728 10,587 3,823.4617
2020-11-12 2020-09-30 13F ANTERIX COM 03676C100 291,308 19 0.01 9,529 -27.84 0.0040
2020-08-13 2020-06-30 13F ANTERIX COM 03676C100 291,289 15,086 5.46 13,206 4.70 0.0058
2020-05-14 2020-03-31 13F ANTERIX COM 03676C100 276,203 16,429 6.32 12,613 12.38 0.0066
2020-02-14 2019-12-31 13F ANTERIX COM 03676C100 259,774 12,392 5.01 11,224 25.34 0.0041
2019-11-12 2019-09-30 13F ANTERIX COM 03676C100 247,382 21,725 9.63 8,955 -15.57 0.0035
2019-08-13 2019-06-30 13F PDVWIRELESS COM 69290R104 225,657 63,249 38.94 10,606 85.78 0.0041
2019-08-12 2019-03-31 13F/A-2 PDVWIRELESS COM 69290R104 162,408 58,152 55.78 5,709 46.46 0.0023
2019-05-10 2019-03-31 13F PDVWIRELESS COM 69290R104 162,408 58,152 5,709
2019-02-26 2018-12-31 13F/A-1 PDVWIRELESS COM 69290R104 104,256 31,120 42.55 3,898 57.24 0.0018
2019-02-13 2018-12-31 13F PDVWIRELESS COM 69290R104 104,256 31,120 3,898
2018-11-13 2018-09-30 13F PDVWIRELESS COM 69290R104 73,136 23,523 47.41 2,479 100.24 0.0009
2018-08-10 2018-06-30 13F PDVWIRELESS COM 69290R104 49,613 49,613 1,238 0.0005
2018-05-11 2018-03-31 13F PDVWIRELESS COM 69290R104 0 -6,674 -100.00 0 -100.00
2018-02-12 2017-12-31 13F PDVWIRELESS COM 69290R104 6,674 -441 -6.20 214 0.94 0.0001
2017-11-13 2017-09-30 13F PDVWIRELESS COM 69290R104 7,115 7,115 212 0.0001
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.