Matindi v National Assembly & 4 others; Kenya Ports Authority (Intended Interested Party)
The bottom line
#Supreme Court rejects late joinder bid by Kenya Ports Authority in tax exemption appeal.
What this practically means
#Kenya Ports Authority tried to join an appeal about tax exemptions for financing agreements, arguing it had a financial stake. The Supreme Court said no, because the issues KPA wanted to raise were already covered by other parties. Also, KPA knew about the case since the High Court stage but never asked to join earlier, without a good reason. Joining a case is not automatic; you must show a clear personal interest and that your input adds something new.
Executive summary
#Questions the Court framed
#The issues the Court set itself to decide, in its own words.
- 1.Whether the intended interested party has met the threshold for joinder as an interested party as settled in Trusted Society of Human Rights Alliance Vs Mumo Matemu & 5 others and Francis Karioko Muruatetu & another Vs Republic & 5 others
- 2.Whether the application for joinder was filed within the stipulated timelines under Rule 24 of the Supreme Court Rules
- 3.Whether the intended interested party has provided a justifiable explanation for not applying to be joined in the High Court or Court of Appeal proceedings
Key legal issues
#Whether the intended interested party met the threshold for joinder as an interested party
The intended interested party did not meet the threshold because the issues it sought to raise were already addressed by the parties, and it failed to apply for joinder in the lower courts without justifiable explanation.
The court considered the application for joinder by Kenya Ports Authority. It noted that the issues the applicant intended to canvass had been largely addressed by the 3rd and 5th respondents in the appeal. Additionally, the applicant was aware of the proceedings in the High Court and Court of Appeal but did not apply to be joined there, and provided no justifiable reason for this failure. The court therefore found no merit in the application and dismissed it.
Whether the application for joinder was filed within the stipulated timelines under Rule 24 of the Supreme Court Rules
The court did not expressly rule on this issue but considered the petitioner's objection that the application was filed outside the stipulated timelines; however, the court dismissed the application on other grounds.
The petitioner argued that the application was filed outside the seven-day period under Rule 24(1) of the Supreme Court Rules. The court did not specifically address this procedural objection but instead dismissed the application on substantive grounds, namely that the issues were already addressed and the applicant failed to seek joinder in the lower courts.
Legal principles established
#- An interested party must have a personal stake in the proceedings and show how they will be affected by the court's decision.
- Joining a case as an interested party is not a right; it is at the court's discretion based on sufficient grounds.
- An applicant must demonstrate prejudice they will suffer if not joined, and that their submissions are not just repeating what others will say.
- A party aware of proceedings in lower courts must apply for joinder there first, or give a justifiable reason for not doing so.
- The court will dismiss a joinder application if the issues raised are already addressed by existing parties.
Court orders
#- 1.The Notice of Motion dated 3rd June 2025 and filed on 10th June 2025, is hereby dismissed.
- 2.Each party shall bear its costs.
The bench
#One judgment of the whole court — no separate or dissenting opinions.
- On appeal from
- Court of Appeal
- Jurisdiction invoked
- Sections 3, 3A and 23(2B) of the Supreme Court Act, 2011, and Rule 24 of the Supreme Court Rules, 2020
Relief refused
#Leave to join the Kenya Ports Authority as an interested party
The issues highlighted by the applicant have been largely addressed by the parties in the appeal, particularly the 3rd and 5th respondents; the applicant did not apply to be joined in the High Court or Court of Appeal and has not provided a justifiable reason for this lapse.
Leave to file a response and submissions to the appeal
The application for joinder was dismissed, so this ancillary relief was also refused.
Costs
Each party shall bear its costs.
Quotable passages
#Verbatim from the judgment, each located to the page it appears on in the official PDF — so these can be cited and checked directly.
Consequently, an interested party is one who has a stake in the proceedings, though he or she was not party to the cause ab initio. He or she is one who will be affected by the decision of the Court when it is made, either way.
Key timeline
#Practical implications
#Joinder threshold tightened
When advising clients on joining Supreme Court appeals, ensure they apply in lower courts first if aware of proceedings. The court will reject late joinders unless you provide a compelling reason for the delay. Also, verify that your client's submissions are not duplicative of existing parties' arguments, or the application will be dismissed.
Act early to protect interests
If your company has a stake in a court case, do not wait until the Supreme Court stage to seek involvement. Monitor proceedings from the High Court and apply for joinder promptly. The court expects you to act as soon as you know your interests may be affected, or you risk being shut out entirely.
Know your court rights
You cannot simply walk into a Supreme Court case and demand to be heard. You must show a direct personal interest, explain how you will be harmed if not included, and prove your arguments are not just repeating what others have said. Also, you should have tried to join the case earlier in lower courts.
Frequently asked questions
#What is an interested party in a Kenyan Supreme Court case?+
An interested party is someone who is not originally part of a case but has a personal stake in the outcome. They must show they will be directly affected by the court's decision, and their participation must add new arguments, not just repeat what others have said.
Can I join a Supreme Court case in Kenya at any time?+
No. Joining is at the court's discretion. You must apply early, ideally in lower courts if you knew about the case. The Supreme Court will reject late applications unless you have a very good reason for the delay.
Why did the Supreme Court reject Kenya Ports Authority's joinder application?+
The court found that KPA's arguments were already covered by other parties in the appeal. Also, KPA knew about the case since the High Court but never tried to join there, and gave no good reason for this delay.
What happens if my joinder application is dismissed in Kenya?+
You cannot participate in that case. The court will proceed without you. Each party bears its own costs, meaning you pay your own legal fees. You may still be affected by the final decision, but you will have no chance to present your side.
Cite this brief
#Cite this brief
Caselaw, "Matindi v National Assembly & 4 others; Kenya Ports Authority (Intended Interested Party)", Case Analysis (2026). Petition (Application) E006 of 2025. Source: https://new.kenyalaw.orghttps://new.kenyalaw.org/akn/ke/judgment/kesc/2026/16/eng@2026-01-30
Suggested citation format for research notes or client memos. Always verify the original judgment before relying on any point.