The Mangrove Partners Master Fund, Ltd.
UK short positions the FCA published under this name: 8 companies and 109 disclosures between 26 Mar 2015 and 1 Oct 2024. Each figure is that position as a percentage of the company's issued share capital, not a money value, and percentages are not comparable or summable across companies.
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Positions open when the register closed
No position was still open in the register's final snapshot of 10 Jul 2026: every chain below had already fallen back below the 0.5% publication threshold.
Full disclosure history
Every disclosure the archive holds, grouped by company and ordered oldest first within each chain. A chain begins when the position first crossed 0.5% and ends either at the freeze or at the last disclosure before it fell back below the threshold.
PANTHEON RESOURCES PLC
closed 1 Oct 202414 disclosures · peak 1.53% · first 1 Dec 2022 · last 1 Oct 2024
1 Dec 2022 0.54% · 3 Dec 2022 0.61% · 21 Feb 2023 0.87% · 23 Feb 2023 0.91% · 29 Jun 2023 0.76% · 15 Aug 2023 0.70% · 17 Aug 2023 0.59% · 1 Sep 2023 0.73% · 5 Sep 2023 0.91% · 6 Sep 2023 1.11% · 7 Sep 2023 1.26% · 9 Sep 2023 1.43% · 11 Sep 2023 1.53% · 1 Oct 2024 0.00%
The chain ends here: the register holds no later disclosure, which normally means the position fell back below 0.5%.
Premier Oil PLC
closed 30 Mar 20206 disclosures · peak 0.97% · first 17 Mar 2020 · last 30 Mar 2020
17 Mar 2020 0.97% · 23 Mar 2020 0.87% · 24 Mar 2020 0.70% · 25 Mar 2020 0.66% · 27 Mar 2020 0.50% · 30 Mar 2020 0.37%
The chain ends here: the register holds no later disclosure, which normally means the position fell back below 0.5%.
TULLOW OIL PLC
closed 18 Mar 20202 disclosures · peak 0.82% · first 17 Mar 2020 · last 18 Mar 2020
17 Mar 2020 0.82% · 18 Mar 2020 0.46%
The chain ends here: the register holds no later disclosure, which normally means the position fell back below 0.5%.
IP GROUP PLC
closed 25 Sep 201914 disclosures · peak 1.57% · first 20 May 2016 · last 25 Sep 2019
20 May 2016 0.50% · 20 Jun 2016 0.63% · 7 Jul 2016 0.78% · 8 Jul 2016 0.80% · 27 Jul 2016 0.99% · 1 Aug 2016 1.03% · 2 Mar 2017 1.46% · 7 Jun 2017 1.57% · 9 Jun 2017 1.33% · 23 Mar 2018 0.66% · 28 Mar 2018 0.09% · 8 Feb 2019 0.50% · 28 Feb 2019 0.62% · 25 Sep 2019 0.29%
The chain ends here: the register holds no later disclosure, which normally means the position fell back below 0.5%.
NIOX GROUP PLC
closed 3 Jun 201934 disclosures · peak 5.42% · first 17 Mar 2016 · last 3 Jun 2019
17 Mar 2016 0.57% · (10 further disclosures) · 29 Jul 2016 1.71% · 8 Aug 2016 1.81% · 16 Aug 2016 1.91% · 20 Mar 2017 2.04% · 24 Mar 2017 2.33% · 3 Apr 2017 2.46% · 13 Apr 2017 3.53% · 18 Apr 2017 3.74% · 28 Apr 2017 3.27% · 4 May 2017 3.44% · 9 May 2017 3.53% · 1 Jun 2017 3.63% · 9 Jun 2017 3.73% · 15 Jun 2017 3.85% · 16 Jun 2017 3.97% · 21 Jun 2017 4.45% · 22 Jun 2017 4.65% · 8 Sep 2017 4.79% · 15 Sep 2017 4.91% · 11 Oct 2017 5.32% · 7 Nov 2017 5.42% · 16 May 2019 2.39% · 3 Jun 2019 0.00%
The chain ends here: the register holds no later disclosure, which normally means the position fell back below 0.5%.
DIVERSIFIED ENERGY COMPANY LIMITED
closed 29 Mar 201910 disclosures · peak 3.75% · first 18 Apr 2018 · last 29 Mar 2019
18 Apr 2018 1.02% · 19 Apr 2018 2.55% · 8 May 2018 3.11% · 14 May 2018 3.57% · 15 May 2018 3.75% · 27 Jul 2018 2.43% · 31 Jul 2018 2.59% · 2 Aug 2018 2.72% · 28 Mar 2019 1.66% · 29 Mar 2019 0.00%
The chain ends here: the register holds no later disclosure, which normally means the position fell back below 0.5%.
ALLIED MINDS PLC
closed 11 Apr 201819 disclosures · peak 1.65% · first 14 Jan 2016 · last 11 Apr 2018
14 Jan 2016 0.50% · 28 Jan 2016 0.60% · 29 Feb 2016 0.70% · 15 Mar 2016 0.80% · 29 Mar 2016 0.91% · 6 Apr 2016 1.00% · 19 Apr 2016 1.11% · 31 Oct 2016 1.28% · 24 Feb 2017 1.18% · 2 Mar 2017 1.29% · 7 Mar 2017 1.39% · 13 Mar 2017 1.49% · 17 Mar 2017 1.65% · 27 Mar 2018 1.55% · 28 Mar 2018 1.45% · 4 Apr 2018 1.28% · 5 Apr 2018 0.83% · 6 Apr 2018 0.55% · 11 Apr 2018 0.39%
The chain ends here: the register holds no later disclosure, which normally means the position fell back below 0.5%.
Vedanta Resources PLC
closed 13 Jun 201710 disclosures · peak 0.91% · first 26 Mar 2015 · last 13 Jun 2017
26 Mar 2015 0.57% · 16 Apr 2015 0.40% · 27 May 2015 0.59% · 10 Jun 2015 0.69% · 11 Jun 2015 0.74% · 29 Feb 2016 0.80% · 13 Oct 2016 0.91% · 28 Apr 2017 0.78% · 2 May 2017 0.66% · 13 Jun 2017 0.47%
The chain ends here: the register holds no later disclosure, which normally means the position fell back below 0.5%.
Frequently asked questions
- Which UK companies did The Mangrove Partners Master Fund, Ltd. short?
- The FCA's named register recorded The Mangrove Partners Master Fund, Ltd. against 8 UK companies between 2015 and 2026, across 109 disclosures. No position was still open when the register closed on 10 Jul 2026.
- Is this list current?
- No. It is a frozen archive. The FCA stopped publishing position-holder names on 13 July 2026 and now publishes one anonymous aggregate per company per day, so no new named UK disclosure exists after 10 Jul 2026. Today's UK figures are on each company's own page.
- Was this the whole of The Mangrove Partners Master Fund, Ltd.'s UK short book?
- No. Only net short positions of 0.5% or more of a company's issued share capital were published with the holder's name. Smaller positions were reported to the FCA privately and never appeared in the register, so the archive is a floor, not a full book.
Source: the Financial Conduct Authority's daily short positions file, captured on 10 Jul 2026 from fca.org.uk and archived unchanged. Figures are as the FCA published them; this site is not affiliated with the FCA. Nothing here is investment advice.