Editor’s note: This is general educational information about Nigeria’s closed period and insider dealing rules. It is not investment advice. It is based on the exchange and regulatory documents listed at the end.
Once a quarter, the people who know most about a Nigerian listed company are forbidden from acting on what they know. The mechanism is the closed period, set out in Chapter 17 of the Issuers’ Rules of Nigerian Exchange Limited, whose current wording the Securities and Exchange Commission approved on 9 April 2021. It is a blunt instrument by design. Rather than asking whether a particular director actually held price sensitive information on a particular day, it shuts the trading window for everyone in a defined group across a defined stretch of the calendar.
Who is covered and when the window shuts
Rule 17.16 identifies the restricted group as directors, persons discharging managerial responsibility, advisers of the issuer, and their connected persons. The 2021 amendment replaced the older and vaguer term insiders with that list, which narrows the class while making it easier to identify. Those persons may deal in the issuer’s securities only during the free open period.
Rule 17.17 defines the closed period as any period during which trading is restricted, and lists what brings one on. Declaration of financial results, quarterly, half-yearly and annual. Declaration of interim and final dividends. Issues of securities by public offer, rights or bonus. Major expansion plans, winning a bid, or executing new projects, with amalgamation, mergers, takeovers and buy-back named as examples. Disposal of the whole or a substantial part of the undertaking. Changes in policies, plans or operations likely to materially affect the share price. Disruption of operations due to natural calamities. Litigation or dispute with a material impact. And a residual category covering any price sensitive information.
Rule 17.18 sets the boundaries. For financial results and dividends the period runs from fifteen days before the end of the financial period under review. For everything else it runs from fifteen calendar days before the board meeting called to consider the matter, or the date the agenda and board papers circulate, whichever is earlier. In both cases it ends twenty four hours after the price sensitive information is submitted to the exchange through the Issuers’ Portal, at which point the window reopens.
The timing of the first branch is the part most often misread. The closed period for results does not begin when the board sits to approve them. It begins fifteen days before the quarter itself ends, which means a substantial part of the restriction falls in a period when the numbers being protected are not yet final. That is deliberate. Someone running the business knows the shape of a quarter before the accounts close.
The obligations that sit around it
Every issuer must notify the exchange in advance of the commencement of each closed period, and no issuer may suspend a closed period once it has been announced. That second rule removes the most obvious abuse, which would be lifting the restriction because someone wants to trade.
Three narrow exceptions exist, and each requires the exchange’s prior approval. Trading may be permitted to execute transactions required by statute, regulation or court order, to exercise stock options under a pre-existing employee share option scheme, and to execute large volume trades or block divestments between insiders only. The exchange may refuse approval where it considers the trade would interfere with the fair and orderly functioning of its market.
The closed period sits on top of a statutory prohibition rather than replacing it. Section 137 of the Investments and Securities Act, 2025 provides that a person who is an insider shall not buy, sell or otherwise deal, directly or indirectly, in securities while holding material non-public information about them, and separately bars a person in a relationship with an issuer from tipping, recommending or encouraging another to trade on an undisclosed material fact. Section 137(3) requires a person who becomes an insider to file a report within 14 days of becoming one, or of carrying out an insider transaction, disclosing beneficial ownership or control of the issuer’s securities and any related financial instrument. The Act defines insider dealing as buying or selling by an insider in possession of confidential, non-public and price sensitive information, for their own benefit or another’s, and extends the definition of insider to anyone holding such information about a body corporate, including people who misappropriated confidential information from an employer.
The Commission’s consolidated rules add the routine reporting layer, requiring directors and other insiders to file notice on the sale or purchase of their shares in the company and to disclose interests in stockbroking and dealing companies.
What enforcement actually looks like
NGX Regulation Limited publishes the results weekly. Schedule 5 of the X-Compliance Report covers disclosure violations, and in the edition dated 28 August 2026 almost every entry in it is the same offence. Aradel Holding Plc was sanctioned on 17 February 2025 for trading during a closed period. ABC Transport Plc followed on 20 February 2025, Secure Electronic Technologies Plc on 25 February 2025, Cutix Plc on 28 February 2025 and Haldane McCall Plc on 16 April 2025. Meyer Plc was sanctioned on 21 October 2025. In the current cycle the list runs through Mutual Benefits Insurance Plc on 15 January 2026, Austin Laz & Company Plc on 16 January 2026, Sterling Financial Holdings Company Plc on 23 January 2026, Tantalizers Plc on 10 February 2026, NPF Microfinance Bank Plc on 17 February 2026 and Learn Africa Plc on 4 June 2026.
Only one entry in the schedule is a different breach, FCMB Group Plc on 18 June 2025 for unauthorised publication of an announcement. The sanction in almost every case was a caution letter. Tantalizers Plc received mandatory compliance training instead.
Analysis: what the sanctions schedule records, and what it leaves out
The pattern in Schedule 5 is worth stating plainly, because it cuts against how closed period rules are usually described. This is not a rarely triggered anti-fraud provision. In Schedule 5 of the 28 August 2026 X-Compliance Report it accounts for every entry but one, and the companies named there are drawn from insurance, transport, publishing, microfinance, upstream oil and financial holdings, with sanction dates spread across most months of the reporting cycle.
Two features of the rule explain the volume. The first is the fifteen day pre-quarter start, which means the window closes before anything has happened that would remind a director it has closed. There is no filing, no board meeting and no announcement at that moment, only a date. The second is the breadth of the covered group. Connected persons of directors and of persons discharging managerial responsibility fall inside the restriction, and a company that has notified the exchange of a closed period is answerable for trades placed by people who may never see the notification.
The enforcement response, a caution letter in eleven of the twelve closed period cases in the schedule, is consistent with treating these as compliance failures rather than attempts to profit from inside information. That reading is plausible and the report contains nothing to contradict it. But the report also does not publish what would test it. It gives the company name, the nature of the breach and the date of sanction, and no volume, no direction, no proximity to the results announcement, and no indication whether the trade was by a director or a connected person. Distinguishing a diary error from an informed trade requires exactly the detail the schedule withholds.
Section 137 of the Act remains available for the second kind of case, with a considerably heavier consequence than a caution letter, and it is enforced by the Commission rather than the exchange. A reader tracking this area should treat the X-Compliance Report as the record of exchange level sanctions and the Commission’s own enforcement pages as the separate record of action taken under the Act. The two are published independently of each other.
