Shannon River Fund Management LLC

Position in ADTN — ADTRAN Holdings, Inc.

CIK 1301050 NEW YORK, NY

Position in ADTN

as of Mar 31, 2026 · filed May 14, 2026 Compact

Position Value

$15,347,298

New position

Shares Held

1,219,976

first reported quarter

Ownership

1.50%

of shares outstanding

% of Portfolio

2.93%

of 13F equity value

Holder Rank

—

not a current holder

Holding Since

Mar 2026

1 quarter on record

Voting authority Sole 87% Shared 0% None 13%

Technology · as of Jun 30, 2026

Shannon River Fund Management LLC holds $111,303,159 across 3 Communication Equipment names.

#	Ticker	Company	Shares	Value (USD)
1	EXTR	Extreme Networks Inc	1,424,095	$46,097,955
2	CIEN	Ciena Corp	81,298	$39,881,546
3	NOK	Nokia Corp	1,906,902	$25,323,658

1 filing row on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-03-31	$15,347,298	1,219,976	—	Shares	Sole	2026-05-14
No filing history on record for this holder in this stock.