SCHEDULE Filed 2025-03-05 Event 2025-02-28 SEC 0001213900-25-020900 →

Heard Capital LLC → Anterix Inc. ATEX

Stake: 9.40% Shares: 1,741,989 CUSIP: 03676C100 Class: Common Stock, $0.0001 par value per share

Composite Decision Signal · PASS (LOW BASE-RATE EDGE) Conviction Score: 24/100 · Filer 90d Win Rate: 0% · Hist. 90d Edge: -30.9%

Passive Schedule 13G filer baseline
High conviction ownership stake (9.4%)
8 NPORT-P mutual funds holding CUSIP
Elevated short days-to-cover (6.1 DTC)

Item 4 — Purpose of Transaction

Item 4 is hereby amended to add the following: On February 28, 2025, Mr. Heard elected to begin receiving stock compensation under the Issuer's non-employee director compensation program.

Cross-References

Insider Activity (last 365d)

8 transactions

0 buys · 6 sales · 1 awards/exercises

Issuer Cluster

14 13D/G filings on this issuer

13 other filings besides this one

Filer Track Record

1 filings by this filer

0 other filings in the data moat

Short Interest · settle 2026-10-15

DTC 6.08

1,659,977 shares short · +0.3% vs prior

Post-Filing Returns · since 2025-02-28 on ATEX

+1 day

-2.3%

+5 days

-0.2%

+30 days

-6.2%

+60 days

-25.1%

+90 days

-30.9%

+180 days

-39.4%

Anchor price 39.00 on closest trading day on/after 2025-02-28. Source: Yahoo Finance daily adj_close (split + dividend adjusted).

Form 4 Insider Transactions · last 365d

Date	Insider	Role	Type	Shares	Price	Value
2026-10-09	Marquez Elena	officer	Sale	3,254	$80.16	$261K
2026-10-09	Marquez Elena	officer	Sale	400	$81.80	$33K
2026-10-09	Marquez Elena	officer	Sale	100	$82.50	$8K
2026-10-09	Marquez Elena	officer	Option exercise	1,227	$40.00	$49K
2026-10-09	Marquez Elena	officer	Sale	1,017	$80.22	$82K
2026-10-09	Marquez Elena	officer	Sale	210	$81.90	$17K
2026-09-29	Marquez Elena	officer	F	1,325	$81.75	$108K
2026-09-21	Lang Scott A.	director, officer	Sale	15,000	$80.00	$1.20M

Other 13D/G Filings on Anterix Inc.

Filed	Form	Filer	Stake	Shares
2026-07-27	SCHEDULE 13G	BlackRock, Inc.	—	—	view →
2026-07-08	SCHEDULE 13D/A	Owl Creek Asset Management, L.P.	28.50%	5,411,776	view →
2026-07-08	SCHEDULE 13G	T. Rowe Price Investment Management, Inc.	—	—	view →
2020-07-20	SC	Owl Creek Asset Management, L.P.	—	—	view →
2020-05-15	SC	Owl Creek Asset Management, L.P.	—	—	view →
2020-05-11	SC	FEINBERG STEPHEN	—	—	view →
2020-03-17	SC	Owl Creek Asset Management, L.P.	—	—	view →
2020-02-03	SC	FEINBERG STEPHEN	—	—	view →
2019-11-07	SC	FEINBERG STEPHEN	—	—	view →
2019-10-21	SC	Owl Creek Asset Management, L.P.	—	—	view →
2019-10-09	SC	Owl Creek Asset Management, L.P.	—	—	view →
2019-09-04	SC	FEINBERG STEPHEN	—	—	view →
2019-06-07	SC	FEINBERG STEPHEN	—	—	view →

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