TEN r&d expenses history

Quarterly · USD. Dates are reporting period ends; fiscal years can differ from calendar years.

Tsakos Energy Navigation Ltd Common Shares R&D Expenses — Quarterly (USD)
Period ending	R&D Expenses (USD)
Jun 30, 2026	0
Mar 31, 2026	0
Dec 31, 2025	0
Sep 30, 2025	0
Jun 30, 2025	0
Mar 31, 2025	0
Dec 31, 2024	0
Sep 30, 2024	0
Jun 30, 2024	0
Mar 31, 2024	0
Dec 31, 2023	0
Sep 30, 2023	0
Jun 30, 2023	0
Mar 31, 2023	0
Dec 31, 2022	0
Sep 30, 2022	71,000,000
Jun 30, 2022	74,000,000
Mar 31, 2022	75,000,000
Dec 31, 2021	69,000,000
Sep 30, 2021	71,000,000
Jun 30, 2021	73,000,000
Mar 31, 2021	72,000,000
Dec 31, 2020	74,000,000
Sep 30, 2020	67,000,000
Jun 30, 2020	55,000,000
Mar 31, 2020	77,000,000
Dec 31, 2019	76,000,000
Sep 30, 2019	78,000,000
Jun 30, 2019	78,000,000
Mar 31, 2019	92,000,000
Dec 31, 2018	82,000,000
Sep 30, 2018	39,000,000
Jun 30, 2018	42,000,000
Mar 31, 2018	41,000,000
Dec 31, 2017	43,000,000
Sep 30, 2017	40,000,000
Jun 30, 2017	36,000,000
Mar 31, 2017	39,000,000
Dec 31, 2016	37,000,000
Sep 30, 2016	41,000,000
Jun 30, 2016	37,000,000
Mar 31, 2016	39,000,000
Dec 31, 2015	32,000,000
Sep 30, 2015	35,000,000
Jun 30, 2015	38,000,000
Mar 31, 2015	41,000,000
Dec 31, 2014	43,000,000
Sep 30, 2014	42,000,000
Jun 30, 2014	42,000,000
Mar 31, 2014	42,000,000
Dec 31, 2013	41,000,000
Sep 30, 2013	35,000,000
Jun 30, 2013	33,000,000
Mar 31, 2013	35,000,000
Dec 31, 2012	32,000,000
Sep 30, 2012	28,000,000
Jun 30, 2012	28,000,000
Mar 31, 2012	38,000,000
Dec 31, 2011	31,000,000
Sep 30, 2011	32,000,000
Jun 30, 2011	35,000,000
Mar 31, 2011	35,000,000
Dec 31, 2010	27,000,000
Sep 30, 2010	30,000,000
Jun 30, 2010	33,000,000
Mar 31, 2010	27,000,000
Dec 31, 2009	25,000,000
Sep 30, 2009	27,000,000
Jun 30, 2009	24,000,000
Mar 31, 2009	21,000,000
Dec 31, 2008	28,000,000
Sep 30, 2008	29,000,000
Jun 30, 2008	34,000,000
Mar 31, 2008	36,000,000
Dec 31, 2007	28,000,000
Sep 30, 2007	30,000,000
Jun 30, 2007	29,000,000
Mar 31, 2007	27,000,000
Dec 31, 2006	20,000,000
Sep 30, 2006	24,000,000
Jun 30, 2006	22,000,000
Mar 31, 2006	22,000,000
Dec 31, 2005	19,000,000
Sep 30, 2005	22,000,000
Jun 30, 2005	18,000,000
Mar 31, 2005	24,000,000
Dec 31, 2004	20,000,000
Sep 30, 2004	22,000,000
Jun 30, 2004	19,000,000
Mar 31, 2004	17,000,000
Dec 31, 2003	17,000,000
Sep 30, 2003	18,000,000
Jun 30, 2003	13,000,000
Mar 31, 2003	19,000,000
Dec 31, 2002	32,000,000
Sep 30, 2002	13,000,000
Jun 30, 2002	12,000,000
Mar 31, 2002	10,000,000
Dec 31, 2001	12,000,000
Sep 30, 2001	11,000,000