From 8988cbe4e99e2d660e99948347cfe6934b899c01 Mon Sep 17 00:00:00 2001
From: Thomas Kaul <4159106+dtslvr@users.noreply.github.com>
Date: Sun, 28 Jun 2026 09:54:25 +0200
Subject: [PATCH] Bugfix/phantom UNKNOWN slice in portfolio proportion chart
 caused by floating point rounding (#7156)

* Fix phantom UNKNOWN slice caused by floating-point rounding

* Update changelog
---
 CHANGELOG.md                                                 | 1 +
 .../portfolio-proportion-chart.component.ts                  | 5 +++--
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8af2fe3d8..e04adcfac 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -16,6 +16,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Fixed
 
+- Fixed a phantom `UNKNOWN` slice in the portfolio proportion chart component caused by floating-point rounding
 - Fixed the base currency for the total value calculation in the public access for portfolio sharing
 - Fixed an issue in the public access for portfolio sharing that exposed absolute values of the top holdings of ETFs
 - Fixed the time zone handling in the `api` test suite for deterministic execution in `UTC`
diff --git a/libs/ui/src/lib/portfolio-proportion-chart/portfolio-proportion-chart.component.ts b/libs/ui/src/lib/portfolio-proportion-chart/portfolio-proportion-chart.component.ts
index bf6fd193e..e24446c34 100644
--- a/libs/ui/src/lib/portfolio-proportion-chart/portfolio-proportion-chart.component.ts
+++ b/libs/ui/src/lib/portfolio-proportion-chart/portfolio-proportion-chart.component.ts
@@ -204,8 +204,9 @@ export class GfPortfolioProportionChartComponent
 
       const unknownValueInPercentage = new Big(1).minus(totalValueInPercentage);
 
-      if (unknownValueInPercentage.gt(0)) {
-        // If total is below 100%, allocate the remaining percentage to UNKNOWN_KEY
+      // If total is below 100%, allocate the remaining percentage to UNKNOWN_KEY,
+      // but ignore negligible remainders to avoid a phantom slice
+      if (unknownValueInPercentage.gt(0.0001)) {
         if (chartData[UNKNOWN_KEY]) {
           chartData[UNKNOWN_KEY].value = chartData[UNKNOWN_KEY].value.plus(
             unknownValueInPercentage