COGENT COMMUNICATIONS HOLDINGS, INC. — SC 13G/A Filings
97 SC 13G/A filings on record
This page lists all SC 13G/A filings submitted to the SEC by COGENT COMMUNICATIONS HOLDINGS, INC. (CCOI), sorted by most recent first. Each row links to the full filing on EdgarLookup. COGENT COMMUNICATIONS HOLDINGS, INC. has filed 97 SC 13G/A documents with the SEC since 2017. To view all SEC filings by COGENT COMMUNICATIONS HOLDINGS, INC., see the full filings list.
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10-K
10-Q
10-Q/A
144
144/A
3
3/A
4
4/A
424B3
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424B5
424B7
425
5
8-A12B
8-A12G
8-K
8-K/A
8-K12G3
ARS
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CT ORDER
DEF 14A
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DEFA14A
FWP
IRANNOTICE
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RW
S-1
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S-4
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S-8
SC 13D
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SC 13G/A
SC 14D9
SC 14D9/A
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SCHEDULE 13G
SCHEDULE 13G/A
UPLOAD
| Form | Description | Accession Number | Filed | Period |
|---|---|---|---|---|
| SC 13G/A | — | 0000315066-13-002295 | Feb 14, 2013 | — |
| SC 13G/A | SCHEDULE 13G AMENDMENT NO.8 | 0001193125-13-058379 | Feb 14, 2013 | — |
| SC 13G/A | — | 0000932471-13-004164 | Feb 12, 2013 | — |
| SC 13G/A | — | 0001305227-13-000397 | Feb 8, 2013 | — |
| SC 13G/A | — | 0000315066-12-002518 | Feb 14, 2012 | — |
| SC 13G/A | SC 13G/A | 0001193125-12-061148 | Feb 14, 2012 | — |
| SC 13G/A | — | 0001086364-12-001998 | Feb 13, 2012 | — |
| SC 13G/A | SCHEDULE 13G AMENDMENT NO. 7 | 0001193125-12-052386 | Feb 10, 2012 | — |
| SC 13G/A | — | 0000919574-12-000382 | Feb 2, 2012 | — |
| SC 13G/A | DOC ONE | 0000315066-11-003706 | Jul 11, 2011 | — |
| SC 13G/A | CCOI AS OF 12/31/2010 | 0000080255-11-000520 | Feb 17, 2011 | — |
| SC 13G/A | — | 0000919574-11-000896 | Feb 14, 2011 | — |
| SC 13G/A | DOC ONE | 0000315066-11-002393 | Feb 14, 2011 | — |
| SC 13G/A | SC 13G/A | 0000950123-11-011928 | Feb 10, 2011 | — |
| SC 13G/A | SC 13G/A | 0000950123-10-111945 | Dec 8, 2010 | — |
| SC 13G/A | — | 0001086364-10-009850 | Oct 8, 2010 | — |
| SC 13G/A | DOC ONE | 0000315066-10-001553 | Feb 16, 2010 | — |
| SC 13G/A | CCOI AS OF 12/31/2009 | 0000080255-10-000257 | Feb 12, 2010 | — |
| SC 13G/A | FORM SC 13G/A | 0000950103-10-000386 | Feb 12, 2010 | — |
| SC 13G/A | SCHEDULE 13G-A(1) | 0000919574-10-000705 | Feb 10, 2010 | — |
| SC 13G/A | COGENT COMMUNICATIONS 13GA4 | 0000908733-10-000109 | Feb 9, 2010 | — |
| SC 13G/A | DOC ONE | 0000315066-09-003993 | Dec 10, 2009 | — |
| SC 13G/A | SCHEDULE 13G/A | 0000950103-09-002237 | Sep 10, 2009 | — |
| SC 13G/A | DISCLOSURE <5% | 0001374170-09-000062 | Jun 17, 2009 | — |
| SC 13G/A | DOC ONE | 0000315066-09-002549 | Apr 9, 2009 | — |
| SC 13G/A | COGENT COMMUNICATIONS 13GA3 | 0000908733-09-000290 | Mar 9, 2009 | — |
| SC 13G/A | — | 0000905148-09-000802 | Feb 17, 2009 | — |
| SC 13G/A | DOC ONE | 0000315066-09-001593 | Feb 17, 2009 | — |
| SC 13G/A | — | 0000895345-09-000086 | Feb 17, 2009 | — |
| SC 13G/A | SHUMWAY CAPITAL PARTNERS LLC | 0001085146-09-001035 | Feb 17, 2009 | — |
| SC 13G/A | TREMBLANT - COGENT COMM | 0000919574-09-002868 | Feb 17, 2009 | — |
| SC 13G/A | FORM SC 13G/A | 0000950103-09-000299 | Feb 13, 2009 | — |
| SC 13G/A | CCOI AS OF 12/31/08 | 0000080255-09-000330 | Feb 12, 2009 | — |
| SC 13G/A | COGENT COMMUNICATIONS 13GA2 | 0000908733-09-000152 | Feb 6, 2009 | — |
| SC 13G/A | DOC ONE | 0000315066-08-003554 | Sep 10, 2008 | — |
| SC 13G/A | COGENT COMMUNICATIONS 13GA1 | 0000908733-08-000386 | Sep 4, 2008 | — |
| SC 13G/A | DOC ONE | 0000315066-08-002795 | Jun 10, 2008 | — |
| SC 13G/A | CCOI AS OF 2-29-08 | 0000080255-08-000510 | Mar 10, 2008 | — |
| SC 13G/A | — | 0000919574-08-001155 | Feb 14, 2008 | — |
| SC 13G/A | DOC ONE | 0000315066-08-001499 | Feb 14, 2008 | — |
| SC 13G/A | — | 0000895345-08-000123 | Feb 13, 2008 | — |
| SC 13G/A | SC 13G/A | 0001104659-07-088390 | Dec 12, 2007 | — |
| SC 13G/A | SC 13G/A | 0001104659-07-011138 | Feb 14, 2007 | — |
| SC 13G/A | DOC ONE | 0000315066-06-003509 | May 10, 2006 | — |
| SC 13G/A | SCHEDULE 13G AMENDMENT NO.1 | 0001193125-06-031369 | Feb 14, 2006 | — |
| SC 13G/A | SC 13G/A | 0001104659-03-002462 | Feb 14, 2003 | — |
| SC 13G/A | SCHEDULE 13G | 0001047469-03-004387 | Feb 7, 2003 | — |