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Comtech Telecommunications Corp

CMTL
Exchange
Nasdaq
Industry
Radio & Tv Broadcasting & Communications Equipment
SEC CIK
0000023197

No open-market purchases or sales by Comtech Telecommunications Corp insiders were filed in the last 90 days; 77 institutions reported holding it in 13F filings for Q2 2026, worth $27.6M in total; no superinvestor holds it.

Holders of 5% or more of CMTL

Holders whose latest Schedule 13D or 13G filing reports 5% or more of Comtech Telecommunications Corp, largest stake first. The change is against the holder's previous filing.

Holders of 5% or more of CMTL
HolderLatest formStakeChangeFirst filedLatest filingFiling
Magnetar Financial LLC13D/A42.78%22.4M shares+1.16 ppfrom 41.62%Oct 29, 202110 filingsJun 17, 2026SEC
White Hat Capital Partners LP13D/A9.99%5.11M shares0.00 ppfrom 9.99%Jan 24, 20246 filingsJun 16, 2026SEC
QVT Financial LP13G5.71%1.69M sharesNewMay 15, 20261 filingMay 15, 2026SEC
Vanguard Capital Management LLC13G5.01%1.50M sharesNewJul 31, 20261 filingJul 31, 2026SEC

Stakes are as of each holder's latest filing. Holders whose last filing was in the old format (before December 18, 2024) have no stake on record and are not listed, and after an acquisition or delisting holders usually stop filing.

13D and 13G filings

48 Schedule 13D and 13G filings on Comtech Telecommunications Corp, newest first, including old-format filings without a stake.

Schedule 13D and 13G filings on CMTL
Filed (ET)FilerFormStakeChangeEvent dateFiling
Jul 31, 20269:58 AM ETVanguard Capital Management LLC13G5.01%1.50M sharesNewJun 30, 2026SEC
Jul 28, 20261:02 PM ETRoyce & Associates LP13G/A0.54%163.0K shares−4.85 ppfrom 5.39%Below 5%Jun 30, 2026SEC
Jun 17, 20269:14 PM ETMagnetar Financial LLCand 3 others13D/A42.78%22.4M shares+1.16 ppfrom 41.62%Jun 14, 2026SEC
Jun 16, 20269:13 PM ETWhite Hat Capital Partners LPand 6 others13D/A9.99%5.11M shares0.00 ppfrom 9.99%Jun 14, 2026SEC
May 15, 20265:11 PM ETQVT Financial LP13G5.71%1.69M sharesNewMar 31, 2026SEC
Feb 13, 20265:55 PM ETNeedham Investment Management LLCand 3 others13G/A4.00%1.17M shares−2.11 ppfrom 6.11%Below 5%Dec 31, 2025SEC
Jul 23, 20256:52 PM ETMagnetar Financial LLCand 3 others13D/A41.62%21.0M shares+0.67 ppfrom 40.95%Jul 21, 2025SEC
Jul 23, 20255:18 PM ETWhite Hat Capital Partners LPand 6 others13D/A9.99%4.81M shares0.00 ppfrom 9.99%Jul 21, 2025SEC
Apr 29, 20259:02 AM ETRoyce & Associates LP13G5.39%1.58M sharesNewMar 31, 2025SEC
Mar 5, 20259:41 PM ETMagnetar Financial LLCand 3 others13D/A40.95%20.4M shares–Mar 3, 2025SEC
Mar 4, 20254:14 PM ETWhite Hat Capital Partners LPand 6 others13D/A9.99%4.68M shares–Mar 3, 2025SEC
Dec 20, 20245:42 PM ETNeedham Investment Management LLCand 3 others13G/A6.11%1.78M shares–Dec 17, 2024SEC
Nov 18, 2024Porcelain Michael13D/AOld format–––SEC
Nov 13, 2024Needham Investment Management LLC13GOld format–New–SEC
Nov 13, 2024Needham Capital Managment LLC13GOld format–New–SEC
Nov 13, 2024Archon Capital Management LLC13G/AOld format–––SEC
Nov 12, 2024Vanguard Group Inc13G/AOld format–––SEC
Nov 4, 2024Vanguard Group Inc13G/AOld format–––SEC
Oct 18, 2024Magnetar Financial LLC13D/AOld format–––SEC
Oct 18, 2024White Hat Capital Partners LP13D/AOld format–––SEC
Sep 20, 2024Porcelain Michael13DOld format–New–SEC
Jul 8, 20244:32 PM ETBlackRock Inc.13G/AOld format–––SEC
Jun 20, 2024Magnetar Financial LLC13D/AOld format–––SEC
Jun 18, 2024White Hat Capital Partners LP13D/AOld format–––SEC
Feb 13, 2024Vanguard Group Inc13G/AOld format–––SEC
Feb 13, 2024Archon Capital Management LLC13GOld format–New–SEC
Feb 9, 2024Dimensional Fund Advisors LP13G/AOld format–––SEC
Jan 26, 20245:26 PM ETBlackRock Inc.13G/AOld format–––SEC
Jan 25, 2024Magnetar Financial LLC13D/AOld format–––SEC
Jan 24, 2024White Hat Capital Partners LP13DOld format–New–SEC
Dec 15, 2023Magnetar Financial LLC13D/AOld format–––SEC
Oct 10, 2023Magnetar Financial LLC13D/AOld format–––SEC
Jul 7, 20234:35 PM ETBlackRock Inc.13G/AOld format–––SEC
Feb 13, 2023Cooper Creek Partners Management LLC13G/AOld format–––SEC
Feb 10, 2023Dimensional Fund Advisors LP13G/AOld format–––SEC
Feb 9, 2023Vanguard Group Inc13G/AOld format–––SEC
Jan 26, 20238:52 AM ETBlackRock Inc.13G/AOld format–––SEC
Jan 20, 20233:00 PM ETBlackRock Inc.13G/AOld format–––SEC
Mar 11, 20222:13 PM ETBlackRock Inc.13G/AOld format–––SEC
Feb 14, 2022Cooper Creek Partners Management LLC13GOld format–New–SEC
Feb 9, 2022Vanguard Group Inc13G/AOld format–––SEC
Feb 8, 20225:05 PM ETBlackRock Inc.13GOld format–––SEC
Feb 8, 2022Dimensional Fund Advisors LP13G/AOld format–––SEC
Nov 16, 2021Magnetar Financial LLC13D/AOld format–––SEC
Oct 29, 2021Magnetar Financial LLC13DOld format–New–SEC
Feb 12, 2021Dimensional Fund Advisors LP13G/AOld format–––SEC
Feb 10, 2021Vanguard Group Inc13G/AOld format–––SEC
Jan 25, 20214:49 PM ETBlackRock Inc.13GOld format–New–SEC

Form 144: proposed insider sales

Notices from officers, directors and other affiliates planning to sell Comtech Telecommunications Corp shares.

No Form 144 notices for Comtech Telecommunications Corp are on file.