Seems OK to me.

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Note added at 18 mins (2017-11-22 11:28:03 GMT)
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see e.g.:

"Enforcement of judgements - Netherlands

[…]

Legal consequences of attachment of shares, securities and other assets

There are no specific legal consequences.

For the duration of the attachment, the voting right remains with the person against whom attachment is levied."

(http://ec.europa.eu/civiljustice/enforce_judgement/enforce_j... )

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Note added at 20 mins (2017-11-22 11:30:12 GMT)
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"Freeze!" Obtaining pre-judgment attachments

[…]

Pre-judgment attachments

Pre-judgment attachments are usually made to ensure recourse for claims once an enforceable judgment has been obtained by the creditor; however, they can also serve to put pressure on a debtor to enter into a settlement agreement. Pre-judgment attachments may be obtained on a wide variety of assets, including bank balances, receivables, shares, moveable goods and real estate.

In order to secure a pre-judgment attachment of assets, the creditor must obtain permission from a preliminary relief judge. This procedure is relatively simple, fast and inexpensive, and typically does not involve hearing the debtor (which would defeat the purpose, since it would give the debtor an opportunity to dispose of the assets that are to be attached)."

(https://www.akd.nl/Downloads/PublicatiesPDF-NL/24-11-2015_IL... )