Leviathan Oy

Leviathan Oy appears in our data through filings on Mandatum Oyj shares, published by Nasdaq Helsinki. In total, 6 filings cover trades dated from 1 October 2023 to 19 August 2026.

The open-market record is one-sided, with 5 purchases worth €571k and not one sale. Open-market purchases are the filings investors watch most closely, because the insider pays for the shares out of pocket. In 2026 alone, the filings show 1 purchase and no sales.

Half of the purchases are above €109k and half below. Relative to company size, the median is 0.0038% of market cap (5 purchases with a known value). On 5 out of 5 purchases, another insider of the same company was buying within the same 30 days. When several insiders buy within a few weeks of each other, analysts speak of a cluster purchase. Ninety days after publication, 4 purchases show a median change of +22.3%, with the price up in 100% of them. They describe history only and say nothing certain about the share price ahead.

The latest filing, published on 21 August 2026, reports an open-market purchase of €13k in Mandatum Oyj. Between a trade and the moment it shows up on Nasdaq Helsinki, the median delay is 1 day. For comparison, MAR article 19 gives managers three business days to notify a trade. Every figure here comes from the filings published by Nasdaq Helsinki and describes the past, not future prices; it is not investment advice.