| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| 4 | Open Document | Open Filing | 03 May 2023 | 01 May 2023 | 000-14939 | |
| 4 | Open Document | Open Filing | 04 May 2022 | 02 May 2022 | 000-14939 | |
| 4 | Open Document | Open Filing | 04 May 2021 | 03 May 2021 | 000-14939 | |
| 4 | Open Document | Open Filing | 08 Mar 2021 | 05 Mar 2021 | 000-14939 | |
| 4 | Open Document | Open Filing | 08 Feb 2021 | 05 Feb 2021 | 000-14939 | |
| 4 | Open Document | Open Filing | 05 Jan 2021 | 05 Jan 2021 | 000-14939 | |
| 4 | Open Document | Open Filing | 08 Dec 2020 | 07 Dec 2020 | 000-14939 | |
| 4 | Open Document | Open Filing | 09 Nov 2020 | 09 Nov 2020 | 000-14939 | |
| 4 | Open Document | Open Filing | 11 Sep 2020 | 10 Sep 2020 | 000-14939 | |
| 4 | Open Document | Open Filing | 06 Aug 2020 | 05 Aug 2020 | 000-14939 | |
| 4 | Open Document | Open Filing | 05 May 2020 | 01 May 2020 | 000-14939 | |
| 4 | Open Document | Open Filing | 04 Sep 2019 | 03 Sep 2019 | 000-14939 | |
| 4 | Open Document | Open Filing | 02 Aug 2019 | 01 Aug 2019 | 000-14939 | |
| 4 | Open Document | Open Filing | 08 Jul 2019 | 03 Jul 2019 | 000-14939 | |
| 4 | Open Document | Open Filing | 03 Jul 2019 | 01 Jul 2019 | 000-14939 | |
| 4 | Open Document | Open Filing | 03 Jun 2019 | 03 Jun 2019 | 000-14939 | |
| 4 | Open Document | Open Filing | 02 May 2019 | 01 May 2019 | 000-14939 | |
| 4 | Open Document | Open Filing | 01 Apr 2019 | 01 Apr 2019 | 000-14939 | |
| 4 | Open Document | Open Filing | 28 Feb 2019 | 27 Feb 2019 | 000-14939 | |
| 4 | Open Document | Open Filing | 26 Feb 2019 | 21 Feb 2019 | 000-14939 | |
| 4 | Open Document | Open Filing | 22 Aug 2018 | 20 Aug 2018 | 000-14939 | |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | 29 May 2018 | 24 May 2018 | 000-14939 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | 25 May 2018 | 23 May 2018 | 000-14939 |
| 4 | Open Document | Open Filing | FORM 4 | 03 Apr 2018 | 30 Mar 2018 | 000-14939 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | 06 Mar 2018 | 05 Mar 2018 | 000-14939 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | 01 Mar 2018 | 27 Feb 2018 | 000-14939 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | 04 Oct 2017 | 02 Oct 2017 | 000-14939 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | 06 Sep 2017 | 01 Sep 2017 | 000-14939 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | 03 Aug 2017 | 01 Aug 2017 | 000-14939 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | 12 Jul 2017 | 11 Jul 2017 | 000-14939 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | 10 Jul 2017 | 06 Jul 2017 | 000-14939 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | 19 Jun 2017 | 15 Jun 2017 | 000-14939 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | 05 Jun 2017 | 01 Jun 2017 | 000-14939 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | 30 May 2017 | 25 May 2017 | 000-14939 |
| 4 | Open Document | Open Filing | FORM 4 | 02 May 2017 | 28 Apr 2017 | 000-14939 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | 26 Apr 2017 | 24 Apr 2017 | 000-14939 |
| SC 13G/A | Open Document | Open Filing | AMENDMENT NO. 1 | 13 Feb 2017 | ||
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | 10 Feb 2017 | 08 Feb 2017 | 000-14939 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | 12 Jan 2017 | 09 Jan 2017 | 000-14939 |
| 4/A | Open Document | Open Filing | OWNERSHIP DOCUMENT | 11 Jan 2017 | 08 Dec 2016 | 000-14939 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | 12 Dec 2016 | 08 Dec 2016 | 000-14939 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | 30 Nov 2016 | 29 Nov 2016 | 000-14939 |
| 4 | Open Document | Open Filing | FORM 4 | 22 Nov 2016 | 18 Nov 2016 | 000-14939 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | 21 Oct 2016 | 20 Oct 2016 | 000-14939 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | 26 Sep 2016 | 23 Sep 2016 | 000-14939 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | 22 Sep 2016 | 20 Sep 2016 | 000-14939 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | 30 Aug 2016 | 29 Aug 2016 | 000-14939 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | 24 Aug 2016 | 23 Aug 2016 | 000-14939 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | 07 Aug 2015 | 05 Aug 2015 | 000-14939 |
| SC 13G | Open Document | Open Filing | SC 13G | 13 Jul 2015 | ||
| 4 | Open Document | Open Filing | FORM 4 | 24 Jun 2015 | 22 Jun 2015 | 000-14939 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | 22 May 2015 | 20 May 2015 | 000-14939 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | 04 May 2015 | 30 Apr 2015 | 000-14939 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | 21 Apr 2015 | 20 Apr 2015 | 000-14939 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | 20 Mar 2015 | 20 Mar 2015 | 000-14939 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | 23 Feb 2015 | 20 Feb 2015 | 000-14939 |
| 4 | Open Document | Open Filing | FORM 4 | 22 Jan 2015 | 20 Jan 2015 | 000-14939 |
| 4 | Open Document | Open Filing | FOR YOUR REVIEW | 23 Dec 2014 | 22 Dec 2014 | 000-14939 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | 21 Nov 2014 | 20 Nov 2014 | 000-14939 |
| 4 | Open Document | Open Filing | FORM 4 | 21 Oct 2014 | 20 Oct 2014 | 000-14939 |
| 4 | Open Document | Open Filing | FORM 4 | 24 Sep 2014 | 23 Sep 2014 | 000-14939 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | 26 Aug 2014 | 22 Aug 2014 | 000-14939 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | 16 Sep 2013 | 16 Sep 2013 | 000-14939 |
| 4 | Open Document | Open Filing | FORM 4 | 15 Aug 2013 | 15 Aug 2013 | 000-14939 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | 16 Jul 2013 | 15 Jul 2013 | 000-14939 |
| 4 | Open Document | Open Filing | FORM 4 | 28 Jun 2013 | 26 Jun 2013 | 000-14939 |