As of 1 January 2019, a new investment screening mechanism is in effect covering investments in certain companies whose activities are essential to national security interests, including, national financial stability and autonomy. The screening mechanism applies to direct or indirect acquisitions of 10% (as of 1 July 2023; previously one-third) of the share capital, assets or voting rights or transactions that otherwise enable the acquirer to exercise significant control over the company. Investments that impose a “not insignificant” risk to national security interests may be blocked or subjected to further conditions. The mechanism applies to both domestic and foreign investors.
"§ 1-3. Decision that the law shall apply to other businesses
A ministry shall, within its area of ​​responsibility, make a decision that the Act shall apply in whole or in part to enterprises which
a) processes security-graded information
b) has information, information systems, objects or infrastructure that are crucial for basic national functions
c) conducts activities that are crucial to basic national functions.
The enterprises shall be notified in advance of decisions pursuant to the first paragraph.
The safety authority may, on its own initiative, submit a proposal to a ministry to make a decision pursuant to the first paragraph. If the Ministry does not make a decision in accordance with the security authority's recommendation, the security authority may bring the matter before a final decision to the ministry that has overall responsibility for preventive security work in the civil sector or the ministry that has overall responsibility for preventive security work in the defense sector.
The safety authority shall make decisions pursuant to the first paragraph to undertakings that are not covered by any ministry's area of ​​responsibility. The Ministry is the appellate body.
[...]
§ 10-1. Obligation to notify when acquiring a business
Anyone who directly or indirectly wants to acquire an ownership interest in a business that is subject to this chapter in accordance with § 1-3 , or who is subject to the law pursuant to § 1-2 second paragraph and holds a clearance as mentioned in § 9-3 , must send notification to the ministry when the acquisition will result in the acquirer directly or indirectly obtaining a total of at least 10 per cent of the share capital, share or votes in the business (a qualified shareholding). The same applies when the acquisition will lead to
a.	the acquirer's qualified share is increased to at least 20 per cent, one third, 50 per cent, two thirds or 90 per cent of the share capital, shares or votes in the business
b.	the acquirer obtains significant influence over the management of the business in another way
c.	the acquirer together with his close relatives, cf. the Securities Trading Act § 2-5 , obtains a qualified ownership interest or a position as mentioned in letter a or b.
The reporting obligation applies correspondingly to the transferor and the business acquired, when the transferee will collectively obtain a direct ownership stake of at least 10 per cent of the share capital, share or votes in the business. The same applies when the acquisition will lead to
a.	the acquirer obtains a direct share which constitutes a share as mentioned in the first paragraph, second sentence, letter a
b.	the acquirer obtains a position as mentioned in the first paragraph, second sentence, letter b or c. [...]
An acquisition as mentioned in the first paragraph cannot be carried out until the notification has been processed in accordance with section 10-2 . 
[...]
§ 10-3. Decision to suspend acquisition of business
If an acquisition pursuant to § 10-1 may entail a not insignificant risk that national security interests are threatened, the King may in a Council of Ministers make a decision that the acquisition cannot be completed, or that conditions be set for its implementation. This also applies if an agreement on the acquisition has already been entered into. If no decision is made pursuant to the first sentence, the Ministry shall inform the acquirer of this. [...]" (National Security Act (LOV-2018-06-01-24), as amended, §§ 1-3, 10-1 and 10-3 [google translation])
National Security Act (LOV-2018-06-01-24), as amended
[<a href="https://lovdata.no/dokument/NL/lov/2018-06-01-24">Act</a>]