Form 13-F position report

ANTERIX INC

Reported by CITADEL ADVISORS LLC

Company profile Manager portfolio Source filing
ATEX CUSIP 03676C100 Manager CIK 0001423053
Latest reported change

Reported 161,163 shares, up 52,783 (48.7%) from the prior quarter.

Reported value 160.1%; share count 48.7% vs. the prior quarter.

Added
% of reported 13F value < 0.01% This manager · Q1 2026
Shares 161,163 Quarter-end amount reported
Reported value $6,154,815 Fair value at quarter end
Consecutive quarters held 15 Through Q1 2026

Reported position value by quarter

Reported position value by quarter

Each bar is a Form 13-F quarter-end snapshot. It does not show trades made within the quarter.

Manager history

Quarterly position history

How this manager's reported quarter-end position changed over time.

19 quarters
Quarter Activity Shares Change % of reported 13F Reported value Filed
Q2 2026 Reduced 9,014 -152,149 (-94.4%) < 0.01% $927,901 2026-08-14
Q1 2026 Added 161,163 +52,783 (48.7%) < 0.01% $6,154,815 2026-05-15
Q4 2025 Reduced 108,380 -2,714 (-2.4%) < 0.01% $2,365,935 2026-02-17
Q3 2025 Reduced 111,094 -161,695 (-59.3%) < 0.01% $2,385,188 2025-11-14
Q2 2025 Added 272,789 +23,595 (9.5%) < 0.01% $6,997,038 2025-08-14
Q1 2025 Added 249,194 +81,291 (48.4%) < 0.01% $9,120,500 2025-05-15
Q4 2024 Reduced 167,903 -31,711 (-15.9%) < 0.01% $5,149,585 2025-02-14
Q3 2024 Added 199,614 +32,093 (19.2%) < 0.01% $7,517,463 2024-11-14
Q2 2024 Added 167,521 +98,866 (144.0%) < 0.01% $6,632,156 2024-08-14
Q1 2024 Reduced 68,655 -12,655 (-15.6%) < 0.01% $2,307,495 2024-05-15
Q4 2023 Added 81,310 +706 (0.9%) < 0.01% $2,709,250 2024-02-14
Q3 2023 Added 80,604 +5,811 (7.8%) < 0.01% $2,529,353 2023-11-14
Q2 2023 Added 74,793 +26,331 (54.3%) < 0.01% $2,370,190 2023-08-14
Q1 2023 Added 48,462 +40,283 (492.5%) < 0.01% $1,601,185 2023-05-15
Q4 2022 Reduced 8,179 -46,366 (-85.0%) < 0.01% $263,119 2023-02-14
Q3 2022 New 54,545 +54,545 (0.0%) < 0.01% $1,948,000 2022-11-14
Q1 2022 Reduced 0 -12,684 (-100.0%) 0 $0 2022-05-16
Q4 2021 Added 12,684 +184 (1.5%) < 0.01% $745,000 2022-02-14
Q3 2021 Added 12,500 +4,912 (64.7%) < 0.01% $759,000 2021-11-15
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Institutional context

Who else reported the position

154 managers reported ANTERIX INC for Q1 2026.

Manager Activity Shares Change % of reported 13F Reported value Tenure
Owl Creek Asset Management L P Unchanged 5,411,776 0 14.95% $206,675,725 27 qtrs
Heard Capital LLC Unchanged 1,716,738 0 3.39% $65,562,224 22 qtrs
BlackRock Inc Reduced 1,007,143 -11,132 < 0.01% $38,462,810 7 qtrs
VANGUARD CAPITAL MANAGEMENT LLC New 573,847 +573,847 < 0.01% $21,915,217 1 qtr
QVT Financial LP Unchanged 503,941 0 1.41% $19,245,507 27 qtrs
PLUSTICK MANAGEMENT LLC New 499,596 +499,596 9.21% $19,079,571 1 qtr
GAMCO INVESTORS INC ET AL Added 425,820 +3,350 0.16% $16,262,066 18 qtrs
DIMENSIONAL FUND ADVISORS LP Added 424,856 +99,933 < 0.01% $16,222,641 27 qtrs
JANE STREET GROUP LLC Added 420,857 +261,843 < 0.01% $16,072,529 15 qtrs
STATE STREET CORPORATION Added 387,918 +54,130 < 0.01% $14,814,588 26 qtrs
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Filing details and methodology As reported
Report period
March 31, 2026
Filed
May 15, 2026
Filing type
13F-HR
Position type
COM

Voting authority reported

Sole
161,163
Shared
0
None
0

“None” means the manager reported no voting authority for those shares on non-routine matters. It does not disclose why and is not evidence of securities lending.

Form 13-F is a delayed quarter-end snapshot of disclosed long Section 13(f) securities. It can be filed up to 45 days after quarter end, excludes short positions and most non-U.S. securities, and does not reveal intra-quarter trading. For options, reported shares and value describe the underlying-share exposure; strike, expiry, premium, and written positions are not disclosed.