  This paper summarizes the joint participation of the Trading Central Labs and
the L3i laboratory of the University of La Rochelle on both sub-tasks of the
Shared Task FinSim-4 evaluation campaign. The first sub-task aims to enrich the
'Fortia ESG taxonomy' with new lexicon entries while the second one aims to
classify sentences to either 'sustainable' or 'unsustainable' with respect to
ESG (Environment, Social and Governance) related factors. For the first
sub-task, we proposed a model based on pre-trained Sentence-BERT models to
project sentences and concepts in a common space in order to better represent
ESG concepts. The official task results show that our system yields a
significant performance improvement compared to the baseline and outperforms
all other submissions on the first sub-task. For the second sub-task, we
combine the RoBERTa model with a feed-forward multi-layer perceptron in order
to extract the context of sentences and classify them. Our model achieved high
accuracy scores (over 92%) and was ranked among the top 5 systems.
