Brief Remarks on the Necessary Clarification of Market Abuse Prohibitions in Times of Shareholder Activism

Revue trimestrielle de droit financier – Corporate Finance and Capital Markets Law Review, 2019/3

21 Pages Posted: 5 Nov 2019 Last revised: 19 Nov 2019

See all articles by Alain Pietrancosta

Alain Pietrancosta

Sorbonne Law School; European Corporate Governance Institute (ECGI)

Date Written: October 27, 2019


Three years after implementation of the European Market Abuse Regulation (MAR), the time has come for the general review of its application and effectiveness. The extent and content of any amendments that may be proposed as a result of this review will naturally depend on the contributions of all involved stakeholders. Mobilisation by them, to provide comments based on their experience and analysis, is therefore critical, particularly in light of the first review documents published by European authorities. There seems indeed to be a striking gap between the expectations of practitioners and the concerns expressed by European and national authorities. While the latter show a certain degree of sensitivity to real issues, including bureaucratic overload resulting from specific requirements, the more fundamental issues with the MAR are barely mentioned. Most serious appear to be: its excessive breadth; the ever-increasing ambiguity of key elements and implicit or explicit policy choices, including the central notions of “use” and “inside information”, resulting in an evasive definition of an offence which has reached the level of vagueness squared; the confusion between insider trading prohibitions and positive disclosure requirements imposed on listed issuers; and the general lack of legal certainty in its language and application, perhaps as a result of its approach to an admittedly worthy core ambition to ensure equal information among market participants. Key to success of MAR’s extensive approach to insider trading – in stark contrast to the US conception of the offence, which focuses on freedom to trade and is directed toward fiduciary duty violations – would seem to be safe harbours providing clear guidance to financial markets on what’s allowed. Unfortunately, the MAR fails to do so. In this regard, shareholder activism seems to represent an excellent test bed for various MAR provisions. It well reveals the structural weaknesses of European legislation and underlines the necessity for public normative authorities to reconcile proactively the MAR prohibitions ex ante, in accordance with existing general criminal law principles, and secure shareholder legitimate engagement, therefore minimising the risks and costs of unpredictability, arbitrariness and national divergence in the EU. The legal imperatives to do so here are in line with the economic and financial imperatives. The objective is not to take sides a priori but, if we adhere to the principle that the market as a whole would therefore function more effectively, to ensure that all market participants understand more clearly defined rules of conduct, enabling them and the markets to serve society in an optimally efficient and responsible way.

Keywords: market abuse regulation; insider trading; market manipulation; shareholder activism; legal certainty; short-selling

JEL Classification: G14; G28; G34; G38; K10; K14; K22; K42

Suggested Citation

Pietrancosta, Alain, Brief Remarks on the Necessary Clarification of Market Abuse Prohibitions in Times of Shareholder Activism (October 27, 2019). Revue trimestrielle de droit financier – Corporate Finance and Capital Markets Law Review, 2019/3, Available at SSRN: or

Alain Pietrancosta (Contact Author)

Sorbonne Law School ( email )

17, rue de la Sorbonne
Paris, IL 75005

European Corporate Governance Institute (ECGI) ( email )

c/o the Royal Academies of Belgium
Rue Ducale 1 Hertogsstraat
1000 Brussels

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