Extracting a series of URL using VBA

tl;dr

Your error is due to the fact there are different numbers of elements for the given class name depending on the results per page. So you can't used fixed indexes. For the page you indicated the last index for that class, via the iframe, is 9 i.e. ThisWorkbook.Worksheets("Sheet1").cells(u, 9) = .getElementsByClassName("formContentData")(9).innerText . 10 and 11 are invalid. Below I show a way to determine the number of results and extract info from each result row.

General principle:

Ok... so the following works on the principle of targeting the Details of Changes table for most of the info.

Example extract:

More specifically, I target the rows that repeat the info for No, Date of Change, #Securities, Type of Transaction and Nature of Interest. These values are stored in an array of arrays (one array per row of information). Then the results arrays are stored in a collection to later be written out to the sheet. I loop each table cell in the targeted rows (td tag elements within parent tr) to populate the arrays.

I add in the Name from the table above on the page and also, because there can be more than one row of results, depending on the webpage, and because I am writing the results to a new Results sheet, I add in the URL before each result to indicate source of information.

TODO:

1. Refactor the code to be more modular
2. Potentially add in some error handling

CSS selectors:

① I select the Name element, which I refer to as title, from the Particulars of substantial Securities Holder table.

Example name element:

Inspecting the HTML for this element shows it has a class of formContentLabel, and that it is the first class with this value on the page.

Example HTML for target Name:

This means I can use a class selector , .formContentLabel, to target the element. As it is a single element I want I use the querySelector method to apply the CSS selector.

② I target the rows of interest in the Details of Changes table with a selector combination of .ven_table tr. This is descendant selector combination combining selecting elements with tr tag having parent with class ven_table. As these are multiple elements I use the querySelectorAll method to apply the CSS selector combination.

Example of a target row:

Example results returned by CSS selector (sample):

The rows I am interested start at 1 and repeat every + 4 rows after e.g. row 5 , 9 etc. So I use a little maths in the code to return just the rows of interest:

Set currentRow = data.item(i * 4 + 1)

VBA:

Option Explicit
Public Sub GetInfo()
    Dim IE As New InternetExplorer, headers(), u As Long, resultCollection As Collection
    headers = Array("URL", "Name", "No", "Date of change", "# Securities", "Type of Transaction", "Nature of Interest")
    Set resultCollection = New Collection
    Dim links()
    links = Application.Transpose(ThisWorkbook.Worksheets("Sheet1").Range("A2:A3")) 'A100

    With IE
        .Visible = True

        For u = LBound(links) To UBound(links)
            If InStr(links(u), "http") > 0 Then
                .navigate links(u)

                While .Busy Or .readyState < 4: DoEvents: Wend
                Application.Wait Now + TimeSerial(0, 0, 1) '<you may not always need this. Or may need to increase.
                Dim data As Object, title As Object
                With .document.getElementById("bm_ann_detail_iframe").contentDocument
                    Set title = .querySelector(".formContentData")
                    Set data = .querySelectorAll(".ven_table tr")
                End With

                Dim results(), numberOfRows As Long, i As Long, currentRow As Object, td As Object, c As Long, r As Long

                numberOfRows = Round(data.Length / 4, 0)
                ReDim results(1 To numberOfRows, 1 To 7)

                For i = 0 To numberOfRows - 1
                    r = i + 1
                    results(r, 1) = links(u): results(r, 2) = title.innerText
                    Set currentRow = data.item(i * 4 + 1)
                    c = 3
                    For Each td In currentRow.getElementsByTagName("td")
                        results(r, c) = Replace$(td.innerText, "document.write(rownum++);", vbNullString)
                        c = c + 1
                    Next td
                Next i
                resultCollection.Add results
                Set data = Nothing: Set title = Nothing
            End If
        Next u
        .Quit
    End With
    Dim ws As Worksheet, item As Long
    If Not resultCollection.Count > 0 Then Exit Sub

    If Not Evaluate("ISREF('Results'!A1)") Then '<==Credit to @Rory for this test
        Set ws = Worksheets.Add
        ws.NAME = "Results"
    Else
        Set ws = ThisWorkbook.Worksheets("Results")
        ws.cells.Clear
    End If

    Dim outputRow As Long: outputRow = 2
    With ws
        .cells(1, 1).Resize(1, UBound(headers) + 1) = headers
        For item = 1 To resultCollection.Count
            Dim arr()
            arr = resultCollection(item)
            For i = LBound(arr, 1) To UBound(arr, 1)
                .cells(outputRow, 1).Resize(1, 7) = Application.WorksheetFunction.Index(arr, i, 0)
                outputRow = outputRow + 1
            Next
        Next
    End With
End Sub

Example results using 2 provided tests URLs:

Sample URLs in sheet1:

1. http://www.bursamalaysia.com/market/listed-companies/company-announcements/5928057
2. http://www.bursamalaysia.com/market/listed-companies/company-announcements/5927201