Financial reports
10-K
2023 FY
Annual report
1 Apr 24
10-Q
2023 Q3
Quarterly report
14 Nov 23
10-Q
2023 Q2
Quarterly report
14 Aug 23
10-Q
2023 Q1
Quarterly report
15 May 23
ARS
2022 FY
Annual report to shareholders
25 Apr 23
10-K
2022 FY
Annual report
31 Mar 23
10-Q
2022 Q3
Quarterly report
14 Nov 22
10-Q
2022 Q2
Quarterly report
15 Aug 22
10-Q
2022 Q1
Quarterly report
16 May 22
10-K
2021 FY
Annual report
31 Mar 22
Current reports
8-K
ClearSign Technologies Corporation Announces Closing of $9.3 Million Public Offering and Concurrent Private Placement of Common Stock and Warrants
24 Apr 24
8-K
Entry into a Material Definitive Agreement
23 Apr 24
8-K
ClearSign Technologies Corporation Announces Pricing of $9.3 Million Public Offering and Concurrent Private Placement of Common Stock and Warrants
19 Apr 24
8-K
ClearSign Technologies Corporation Provides Preliminary 2023 Financial Results
7 Feb 24
8-K
Entry into a Material Definitive Agreement
5 Jan 24
8-K
Notice of Delisting or Failure to Satisfy a Continued Listing Rule or Standard
27 Nov 23
8-K
ClearSign Technologies Corporation Provides Third Quarter 2023 Update
15 Nov 23
8-K
Receives Support and Collaboration from SoCalGas for its Flexible Hydrogen Fueled Ultra Low NOx Process Burner Project
22 Sep 23
8-K
ClearSign Technologies Corporation Provides Second Quarter 2023 Update
1 Sep 23
8-K
Other Events
29 Aug 23
Registration and prospectus
424B5
Prospectus supplement for primary offering
23 Apr 24
424B5
Prospectus supplement for primary offering
19 Apr 24
S-8
Registration of securities for employees
1 Apr 24
FWP
Free writing prospectus
19 Mar 24
424B5
Prospectus supplement for primary offering
18 Mar 24
424B5
Prospectus supplement for primary offering
18 Mar 24
424B3
Prospectus supplement
1 Sep 23
8-A12B/A
Registration of securities on exchange (amended)
14 Aug 23
8-A12B/A
Registration of securities on exchange (amended)
11 Aug 23
S-3
Shelf registration
11 Aug 23
Proxies
DEFA14A
Additional proxy soliciting materials
25 Apr 23
DEF 14A
Definitive proxy
25 Apr 23
PRE 14A
Preliminary proxy
14 Apr 23
DEFA14A
Additional proxy soliciting materials
22 Apr 22
DEF 14A
Definitive proxy
22 Apr 22
DEF 14A
Definitive proxy
7 May 21
DEF 14A
Definitive proxy
27 Apr 20
DEF 14A
Definitive proxy
4 Apr 19
PRE 14A
Preliminary proxy
21 Mar 19
PRRN14A
Revised preliminary proxy statement filed by non-management
6 Dec 18
Other
EFFECT
Notice of effectiveness
31 Aug 23
EFFECT
Notice of effectiveness
15 Aug 22
CORRESP
Correspondence with SEC
10 Aug 22
CORRESP
Correspondence with SEC
19 Jul 22
UPLOAD
Letter from SEC
14 Jul 22
UPLOAD
Letter from SEC
5 Jan 22
CORRESP
Correspondence with SEC
23 Dec 21
UPLOAD
Letter from SEC
16 Dec 21
EFFECT
Notice of effectiveness
15 Jul 19
CORRESP
Correspondence with SEC
10 Jul 19