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How shorted is Castellum Aktiebolag? SE0000379190

#22most shorted Swedish stockof 101 companies with disclosed positions, more shorted than 78%

2.85%
of share capital in disclosed short positions · 12 Oct 2026
5-day change
+0.51
20-day change
+0.36
Aggregate net short position time series for Castellum Aktiebolag
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Who is short Castellum Aktiebolag?

Named short positions of 0.5% or more in Castellum Aktiebolag
Position holderPositionSince
Arrowstreet Capital Limited Partnership1.07%22 Sep 2026
MILLENNIUM INTERNATIONAL MANAGEMENT LP0.66%18 Sep 2026
Citadel Advisors LLC0.61%30 Sep 2026
Marchant MC Ltd0.51%8 Oct 2026

Named positions of 0.5%+ as published by the Finansinspektionen. The dates shown are each holder's latest disclosure date.

History

Full disclosed short position history
Position dateShort %Change
12 Oct 20262.85%0.00
9 Oct 20262.85%0.00
8 Oct 20262.85%ʳ+0.51
7 Oct 20262.34%0.00
6 Oct 20262.34%0.00
5 Oct 20262.34%0.00
2 Oct 20262.34%0.00
1 Oct 20262.34%0.00
30 Sep 20262.34%ʳ+0.02
29 Sep 20262.32%0.00
28 Sep 20262.32%ʳ−0.10
25 Sep 20262.42%0.00
24 Sep 20262.42%0.00
23 Sep 20262.42%0.00
22 Sep 20262.42%ʳ−0.03
21 Sep 20262.45%0.00
18 Sep 20262.45%ʳ−0.14
17 Sep 20262.59%0.00
16 Sep 20262.59%ʳ+0.10
15 Sep 20262.49%0.00
14 Sep 20262.49%0.00
11 Sep 20262.49%ʳ+0.01
10 Sep 20262.48%ʳ−0.01
9 Sep 20262.49%0.00
8 Sep 20262.49%0.00
7 Sep 20262.49%0.00
4 Sep 20262.49%0.00
3 Sep 20262.49%0.00
2 Sep 20262.49%0.00
1 Sep 20262.49%+0.10
31 Aug 20262.39%0.00
28 Aug 20262.39%0.00
27 Aug 20262.39%0.00
26 Aug 20262.39%0.00
25 Aug 20262.39%0.00
24 Aug 20262.39%ʳ+0.09
21 Aug 20262.30%0.00
20 Aug 20262.30%0.00
19 Aug 20262.30%ʳ+0.51
18 Aug 20261.79%0.00
17 Aug 20261.79%0.00
14 Aug 20261.79%0.00
13 Aug 20261.79%0.00
12 Aug 20261.79%0.00
11 Aug 20261.79%0.00
10 Aug 20261.79%0.00
7 Aug 20261.79%0.00
6 Aug 20261.79%−0.02
5 Aug 20261.81%0.00
4 Aug 20261.81%0.00
3 Aug 20261.81%0.00
31 Jul 20261.81%0.00
30 Jul 20261.81%0.00
29 Jul 20261.81%0.00
28 Jul 20261.81%0.00
27 Jul 20261.81%0.00
24 Jul 20261.81%0.00
23 Jul 20261.81%0.00
22 Jul 20261.81%0.00
21 Jul 20261.81%0.00
20 Jul 20261.81%0.00
17 Jul 20261.81%0.00
16 Jul 20261.81%0.00
15 Jul 20261.81%ʳ0.00
14 Jul 20261.81%ʳ+0.01
13 Jul 20261.80%ʳ0.00
10 Jul 20261.80%ʳ0.00
9 Jul 20261.80%ʳ0.00
8 Jul 20261.80%ʳ0.00
7 Jul 20261.80%ʳ0.00
6 Jul 20261.80%ʳ−0.01
3 Jul 20261.81%ʳ0.00
2 Jul 20261.81%ʳ0.00
1 Jul 20261.81%ʳ−0.50
30 Jun 20262.31%ʳ0.00
29 Jun 20262.31%ʳ−0.59
26 Jun 20262.90%ʳ0.00
25 Jun 20262.90%ʳ0.00
24 Jun 20262.90%ʳ−0.05
23 Jun 20262.95%ʳ+0.11
22 Jun 20262.84%ʳ0.00
19 Jun 20262.84%ʳ0.00
18 Jun 20262.84%ʳ−0.07
17 Jun 20262.91%ʳ0.00
16 Jun 20262.91%ʳ0.00
15 Jun 20262.91%ʳ+0.11
12 Jun 20262.80%ʳ0.00
11 Jun 20262.80%ʳ0.00
10 Jun 20262.80%ʳ0.00
9 Jun 20262.80%ʳ0.00
8 Jun 20262.80%ʳ+0.05
5 Jun 20262.75%ʳ0.00
4 Jun 20262.75%ʳ+0.09
3 Jun 20262.66%ʳ+0.01
2 Jun 20262.65%ʳ0.00
1 Jun 20262.65%ʳ−0.01
29 May 20262.66%ʳ−0.06
28 May 20262.72%ʳ0.00
27 May 20262.72%ʳ+0.11
26 May 20262.61%ʳ0.00
25 May 20262.61%ʳ0.00
22 May 20262.61%ʳ0.00
21 May 20262.61%ʳ0.00
20 May 20262.61%ʳ0.00
19 May 20262.61%ʳ0.00
18 May 20262.61%ʳ0.00
15 May 20262.61%ʳ+0.51
14 May 20262.10%ʳ0.00
13 May 20262.10%ʳ+0.50
12 May 20261.60%ʳ0.00
11 May 20261.60%ʳ+0.02
8 May 20261.58%ʳ0.00
7 May 20261.58%ʳ0.00
6 May 20261.58%ʳ0.00
5 May 20261.58%ʳ0.00
4 May 20261.58%ʳ0.00
1 May 20261.58%ʳ0.00
30 Apr 20261.58%ʳ−3.95
29 Apr 20265.53%ʳ0.00
28 Apr 20265.53%ʳ+0.50
27 Apr 20265.03%ʳ+3.45
24 Apr 20261.58%ʳ0.00
23 Apr 20261.58%ʳ0.00
22 Apr 20261.58%ʳ+0.50
21 Apr 20261.08%ʳ0.00
20 Apr 20261.08%ʳ0.00
17 Apr 20261.08%ʳ0.00
16 Apr 20261.08%ʳ−0.53
15 Apr 20261.61%ʳ0.00
14 Apr 20261.61%ʳ0.00
13 Apr 20261.61%ʳ0.00
10 Apr 20261.61%ʳ0.00
9 Apr 20261.61%ʳ0.00
8 Apr 20261.61%ʳ0.00
7 Apr 20261.61%ʳ0.00
6 Apr 20261.61%ʳ0.00
3 Apr 20261.61%ʳ0.00
2 Apr 20261.61%ʳ0.00
1 Apr 20261.61%ʳ0.00
31 Mar 20261.61%ʳ0.00
30 Mar 20261.61%ʳ0.00
27 Mar 20261.61%ʳ0.00
26 Mar 20261.61%ʳ0.00
25 Mar 20261.61%ʳ0.00
24 Mar 20261.61%ʳ0.00
23 Mar 20261.61%ʳ0.00
20 Mar 20261.61%ʳ+0.51
19 Mar 20261.10%ʳ0.00
18 Mar 20261.10%ʳ0.00
17 Mar 20261.10%ʳ0.00
16 Mar 20261.10%ʳ0.00
13 Mar 20261.10%ʳ0.00
12 Mar 20261.10%ʳ0.00
11 Mar 20261.10%ʳ0.00
10 Mar 20261.10%ʳ0.00
9 Mar 20261.10%ʳ0.00
6 Mar 20261.10%ʳ0.00
5 Mar 20261.10%ʳ0.00
4 Mar 20261.10%ʳ0.00
3 Mar 20261.10%ʳ0.00
2 Mar 20261.10%ʳ0.00
27 Feb 20261.10%ʳ0.00
26 Feb 20261.10%ʳ0.00
25 Feb 20261.10%ʳ0.00
24 Feb 20261.10%ʳ0.00
23 Feb 20261.10%ʳ0.00
20 Feb 20261.10%ʳ0.00
19 Feb 20261.10%ʳ0.00
18 Feb 20261.10%ʳ0.00
17 Feb 20261.10%ʳ0.00
16 Feb 20261.10%ʳ0.00
13 Feb 20261.10%ʳ0.00
12 Feb 20261.10%ʳ0.00
11 Feb 20261.10%ʳ0.00
10 Feb 20261.10%ʳ0.00
9 Feb 20261.10%ʳ0.00
6 Feb 20261.10%ʳ0.00
5 Feb 20261.10%ʳ0.00
4 Feb 20261.10%ʳ0.00
3 Feb 20261.10%ʳ0.00
2 Feb 20261.10%ʳ0.00
30 Jan 20261.10%ʳ0.00
29 Jan 20261.10%ʳ0.00
28 Jan 20261.10%ʳ0.00
27 Jan 20261.10%ʳ0.00
26 Jan 20261.10%ʳ0.00
23 Jan 20261.10%ʳ0.00
22 Jan 20261.10%ʳ0.00
21 Jan 20261.10%ʳ0.00
20 Jan 20261.10%ʳ0.00
19 Jan 20261.10%ʳ0.00
16 Jan 20261.10%ʳ0.00
15 Jan 20261.10%ʳ0.00
14 Jan 20261.10%ʳ0.00
13 Jan 20261.10%ʳ–

Newest first. Scroll inside the table for earlier dates, back to 13 Jan 2026.

ʳ figure revised after a register re-read. See how revisions work.

About this data

ISIN
SE0000379190
Regulator
Finansinspektionen (Sweden)
First seen in dataset
13 Jan 2026

We show regulatory short-position data only: no prices, no valuations, no recommendations.

Frequently asked questions

How shorted is Castellum Aktiebolag right now?
Disclosed net short positions total 2.85% of Castellum Aktiebolag's share capital as of 12 Oct 2026, per the Finansinspektionen's public register. That makes it the 22nd most shorted Swedish stock, out of 101 companies with disclosed positions.
Who is shorting Castellum Aktiebolag?
The Finansinspektionen names each holder of a position of 0.5% or more. Currently disclosed: Arrowstreet Capital Limited Partnership, MILLENNIUM INTERNATIONAL MANAGEMENT LP, Citadel Advisors LLC and 1 more.
What is Castellum Aktiebolag's short interest?
2.85% of share capital as of 12 Oct 2026. "Short interest" is the US term; the Finansinspektionen publishes each disclosed net short position of 0.5% or more by name, summed here, so it is a lower bound on all short selling in the stock.
What does this number include?
The sum of individually disclosed net short positions of 0.5% or more of share capital. Positions between 0.1% and 0.5% are reported to the regulator privately and are not public, so the true total can be higher.
How often is this updated?
Position holders must disclose changes by the next trading day; we refresh from the Finansinspektionen's register every trading day.