COGENT COMMUNICATIONS HOLDINGS, INC. — SC 13D/A Filings
18 SC 13D/A filings on record
This page lists all SC 13D/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 18 SC 13D/A documents with the SEC since 2017. To view all SEC filings by COGENT COMMUNICATIONS HOLDINGS, INC., see the full filings list.
All
10-K
10-Q
10-Q/A
144
144/A
3
3/A
4
4/A
424B3
424B4
424B5
424B7
425
5
8-A12B
8-A12G
8-K
8-K/A
8-K12G3
ARS
CERTAMX
CORRESP
CT ORDER
DEF 14A
DEF 14C
DEFA14A
FWP
IRANNOTICE
POS AM
PRE 14A
PRE 14C
PRER14A
PRER14C
RW
S-1
S-1/A
S-3
S-3/A
S-3ASR
S-4
S-4/A
S-8
SC 13D
SC 13D/A
SC 13G
SC 13G/A
SC 14D9
SC 14D9/A
SC TO-I
SC TO-I/A
SC TO-T
SC TO-T/A
SCHEDULE 13G
SCHEDULE 13G/A
UPLOAD
| Form | Description | Accession Number | Filed | Period |
|---|---|---|---|---|
| SC 13D/A | AMEND. NO.6 | 0000909518-07-000647 | Jun 27, 2007 | — |
| SC 13D/A | AMENDMENT NO.5 | 0000909518-06-001081 | Nov 29, 2006 | — |
| SC 13D/A | SCHEDULE 13D/A | 0000950005-06-000625 | Nov 20, 2006 | — |
| SC 13D/A | SCHEDULE 13D/A | 0000950005-06-000623 | Nov 20, 2006 | — |
| SC 13D/A | — | 0000950005-06-000541 | Sep 19, 2006 | — |
| SC 13D/A | SCHEDULE 13D/A #2 | 0000950005-06-000417 | Jul 3, 2006 | — |
| SC 13D/A | — | 0000950005-06-000404 | Jun 23, 2006 | — |
| SC 13D/A | — | 0000909518-06-000625 | Jun 16, 2006 | — |
| SC 13D/A | SCHEDULE 13D/A | 0001193125-05-132089 | Jun 27, 2005 | — |
| SC 13D/A | — | 0000909518-05-000243 | Apr 14, 2005 | — |
| SC 13D/A | SC 13D/A | 0001104659-05-011212 | Mar 16, 2005 | — |
| SC 13D/A | SC 13D/A | 0001104659-05-007966 | Feb 23, 2005 | — |
| SC 13D/A | — | 0000909518-04-000989 | Dec 17, 2004 | — |
| SC 13D/A | — | 0000909518-04-000658 | Aug 5, 2004 | — |
| SC 13D/A | SC 13D/A | 0001104659-04-010656 | Apr 21, 2004 | — |
| SC 13D/A | AMENDMENT NO. 1 TO SCHEDULE 13D | 0000950005-04-000360 | Apr 9, 2004 | — |
| SC 13D/A | AMENDMENT TO SCHEDULE 13D | 0000950005-04-000358 | Apr 9, 2004 | — |
| SC 13D/A | SC 13D/A | 0001104659-04-009487 | Apr 6, 2004 | — |