diff --git a/private/functions/Get-BulkRowsCopiedCount.ps1 b/private/functions/Get-BulkRowsCopiedCount.ps1
index a5d4c21c2e9..4ffbc78416c 100644
--- a/private/functions/Get-BulkRowsCopiedCount.ps1
+++ b/private/functions/Get-BulkRowsCopiedCount.ps1
@@ -14,6 +14,7 @@ function Get-BulkRowsCopiedCount {
             - Copy-DbaDbTableData
             - Copy-DbaDbViewData
             - Import-DbaCsv
+            - Import-DbaParquet
 
         .EXAMPLE
             Get-BulkRowsCopied $bulkObject
@@ -27,14 +28,17 @@ function Get-BulkRowsCopiedCount {
         Copyright: (c) 2020 by dbatools, licensed under MIT
         License: MIT https://opensource.org/licenses/MIT
     #>
-    [OutputType([int])]
+    [OutputType([long])]
     param (
         [Microsoft.Data.SqlClient.SqlBulkCopy] $BulkCopy
     )
     $BindingFlags = [Reflection.BindingFlags] "NonPublic,GetField,Instance"
     $rowsCopiedField = [Microsoft.Data.SqlClient.SqlBulkCopy].GetField("_rowsCopied", $BindingFlags)
     try {
-        return [int]$rowsCopiedField.GetValue($BulkCopy)
+        # The field is an Int64 in current Microsoft.Data.SqlClient (an Int32 in the legacy library),
+        # so it must not be narrowed to [int]: above [int32]::MaxValue rows that cast throws, and the
+        # -1 then taken for the row count inflates the reported total by billions of rows (see #10675).
+        return [long]$rowsCopiedField.GetValue($BulkCopy)
     } catch {
         return -1;
     }
diff --git a/public/Copy-DbaDbTableData.ps1 b/public/Copy-DbaDbTableData.ps1
index 3ed8b1aba75..ae6f220efff 100644
--- a/public/Copy-DbaDbTableData.ps1
+++ b/public/Copy-DbaDbTableData.ps1
@@ -722,7 +722,13 @@ function Copy-DbaDbTableData {
                         $bulkCopy.WriteToServer($reader)
                         $finalRowCountReported = Get-BulkRowsCopiedCount $bulkCopy
 
-                        $script:totalRowsCopied += (Get-AdjustedTotalRowsCopied -ReportedRowsCopied $finalRowCountReported -PreviousRowsCopied $script:prevRowsCopied).NewRowCountAdded
+                        # -1 signals that the reflection lookup failed, not a wrapped counter, so it must not
+                        # reach Get-AdjustedTotalRowsCopied: fed in as a row count it inflates the total by
+                        # billions of rows (see #10675). The running total from the notifications is then the
+                        # best number available.
+                        if ($finalRowCountReported -ge 0) {
+                            $script:totalRowsCopied += (Get-AdjustedTotalRowsCopied -ReportedRowsCopied $finalRowCountReported -PreviousRowsCopied $script:prevRowsCopied).NewRowCountAdded
+                        }
 
                         $RowsTotal = $script:totalRowsCopied
                         $TotalTime = [math]::Round($elapsed.Elapsed.TotalSeconds, 1)
diff --git a/public/Import-DbaCsv.ps1 b/public/Import-DbaCsv.ps1
index eb5da19bbc3..d1f9ca2b211 100644
--- a/public/Import-DbaCsv.ps1
+++ b/public/Import-DbaCsv.ps1
@@ -1493,7 +1493,13 @@ WHERE c.object_id = OBJECT_ID(@tableName)
 
                         $finalRowCountReported = Get-BulkRowsCopiedCount $bulkCopy
 
-                        $script:totalRowsCopied += (Get-AdjustedTotalRowsCopied -ReportedRowsCopied $finalRowCountReported -PreviousRowsCopied $script:prevRowsCopied).NewRowCountAdded
+                        # -1 signals that the reflection lookup failed, not a wrapped counter, so it must not
+                        # reach Get-AdjustedTotalRowsCopied: fed in as a row count it inflates the total by
+                        # billions of rows (see #10675). The running total from the notifications is then the
+                        # best number available.
+                        if ($finalRowCountReported -ge 0) {
+                            $script:totalRowsCopied += (Get-AdjustedTotalRowsCopied -ReportedRowsCopied $finalRowCountReported -PreviousRowsCopied $script:prevRowsCopied).NewRowCountAdded
+                        }
 
                         if ($completed) {
                             Write-Progress -Id 1 -Activity "Inserting $($script:totalRowsCopied) rows" -Status "Complete" -Completed
diff --git a/public/Import-DbaParquet.ps1 b/public/Import-DbaParquet.ps1
index c32fa0cdf74..a2086ed7f20 100644
--- a/public/Import-DbaParquet.ps1
+++ b/public/Import-DbaParquet.ps1
@@ -1031,7 +1031,13 @@ WHERE c.object_id = OBJECT_ID(@tableName)
 
                         $finalRowCountReported = Get-BulkRowsCopiedCount $bulkCopy
 
-                        $script:totalRowsCopied += (Get-AdjustedTotalRowsCopied -ReportedRowsCopied $finalRowCountReported -PreviousRowsCopied $script:prevRowsCopied).NewRowCountAdded
+                        # -1 signals that the reflection lookup failed, not a wrapped counter, so it must not
+                        # reach Get-AdjustedTotalRowsCopied: fed in as a row count it inflates the total by
+                        # billions of rows (see #10675). The running total from the notifications is then the
+                        # best number available.
+                        if ($finalRowCountReported -ge 0) {
+                            $script:totalRowsCopied += (Get-AdjustedTotalRowsCopied -ReportedRowsCopied $finalRowCountReported -PreviousRowsCopied $script:prevRowsCopied).NewRowCountAdded
+                        }
 
                         if ($completed) {
                             Write-Progress -Id 1 -Activity "Inserting $($script:totalRowsCopied) rows" -Status "Complete" -Completed
diff --git a/tests/Get-BulkRowsCopiedCount.Tests.ps1 b/tests/Get-BulkRowsCopiedCount.Tests.ps1
new file mode 100644
index 00000000000..140e367eb57
--- /dev/null
+++ b/tests/Get-BulkRowsCopiedCount.Tests.ps1
@@ -0,0 +1,52 @@
+#Requires -Module @{ ModuleName="Pester"; ModuleVersion="5.0" }
+param(
+    $ModuleName = "dbatools",
+    $CommandName = "Get-BulkRowsCopiedCount",
+    $PSDefaultParameterValues = $TestConfig.Defaults
+)
+
+Describe $CommandName -Tag UnitTests {
+    Context "Reading the rows copied counter" {
+        It "Returns the counter value below Int32.MaxValue" {
+            InModuleScope "dbatools" {
+                $bulkCopy = New-Object -TypeName Microsoft.Data.SqlClient.SqlBulkCopy -ArgumentList "Server=dummy"
+                $rowsCopiedField = [Microsoft.Data.SqlClient.SqlBulkCopy].GetField("_rowsCopied", [Reflection.BindingFlags]"NonPublic,GetField,Instance")
+                $rowsCopiedField.SetValue($bulkCopy, [long]100000)
+
+                Get-BulkRowsCopiedCount $bulkCopy | Should -Be 100000
+            }
+        }
+
+        It "Returns the counter value above Int32.MaxValue" {
+            # The field is an Int64 in current Microsoft.Data.SqlClient. A cast to [int] throws above
+            # [int32]::MaxValue, the catch then returned -1, and the callers took that for a wrapped
+            # counter and inflated the reported total by billions of rows (#10675).
+            InModuleScope "dbatools" {
+                $bulkCopy = New-Object -TypeName Microsoft.Data.SqlClient.SqlBulkCopy -ArgumentList "Server=dummy"
+                $rowsCopiedField = [Microsoft.Data.SqlClient.SqlBulkCopy].GetField("_rowsCopied", [Reflection.BindingFlags]"NonPublic,GetField,Instance")
+                $rowsCopiedField.SetValue($bulkCopy, [long]3000000000)
+
+                Get-BulkRowsCopiedCount $bulkCopy | Should -Be 3000000000
+            }
+        }
+
+        It "Keeps the total of the callers correct above Int32.MaxValue" {
+            # The pattern of Copy-DbaDbTableData, Import-DbaCsv and Import-DbaParquet: the running total
+            # from the copy notifications, plus the adjustment for the rows after the last notification.
+            InModuleScope "dbatools" {
+                $bulkCopy = New-Object -TypeName Microsoft.Data.SqlClient.SqlBulkCopy -ArgumentList "Server=dummy"
+                $rowsCopiedField = [Microsoft.Data.SqlClient.SqlBulkCopy].GetField("_rowsCopied", [Reflection.BindingFlags]"NonPublic,GetField,Instance")
+                $rowsCopiedField.SetValue($bulkCopy, [long]3000000000)
+
+                $totalRowsCopied = [long]2999995000
+                $prevRowsCopied = [long]2999995000
+                $finalRowCountReported = Get-BulkRowsCopiedCount $bulkCopy
+                if ($finalRowCountReported -ge 0) {
+                    $totalRowsCopied += (Get-AdjustedTotalRowsCopied -ReportedRowsCopied $finalRowCountReported -PreviousRowsCopied $prevRowsCopied).NewRowCountAdded
+                }
+
+                $totalRowsCopied | Should -Be 3000000000
+            }
+        }
+    }
+}