S2B
SYN2BIO
GPW
LISTED
Shareholders
as of September 20, 2026 · source: notifications under Art. 69 of the Offering Act · 3 entities above 5%
FREE FLOAT
The portion of capital not covered by notifications above 5% — its composition is not publicly known.
53.51%
4,670,430 shares
LARGEST STAKE
23.45%
Cezary Kozanecki
TOP 3 CONCENTRATION
Combined stake of the three largest shareholders above the 5% threshold.
46.49%
3 entities above 5%
LATEST CHANGE
May 19, 2026
ESPI (wykaz z WZ)
Ownership structure
stakes per latest notifications · share count normalized to 8,729,129 shares outstanding
SHAREHOLDERS ≥5% 46.49%
FREE FLOAT 53.51%
HOLDER
STAKE
SHARES
VOTES
NOTIFICATION
Cezary Kozanecki
23.45%
2,047,380
23.45%
September 19, 2026
Mariusz Książek
15.76%
1,376,143
15.76%
August 16, 2026
NATIONALE-NEDERLANDEN Powszechne Towarzystwo Emerytalne S.A.
7.28%
635,176
7.28%
August 16, 2026
Other
53.51%
4,670,430
53.51%
—
Cezary Kozanecki
23.45%
2,047,380 shares · notification September 19, 2026
Mariusz Książek
15.76%
1,376,143 shares · notification August 16, 2026
NATIONALE-NEDERLANDEN Powszechne Towarzystwo Emerytalne S.A.
7.28%
635,176 shares · notification August 16, 2026
Other
53.51%
4,670,430 shares · composition undisclosed
Notification history
crossings above/below the 5% / 10% / 20% thresholdsMay 19, 2026
ESPI (wykaz z WZ) — baseline reading
MELHUS COMPANY LTD:
new in the registry, 23.45%
→
Capital and votes
Number of shares
8,729,129
ISIN
PLSNBIO00013
Sector
Biotechnologia
Market
GPW
Country
PL
Listing date
April 01, 2026
Where this data comes from
The structure is built from notifications shareholders file after crossing 5%, 10%, 15%, 20%, 25%, 33%, 50%, 75% and 90% of votes.
Below 5% there is no disclosure obligation, so the remaining capital is shown collectively as free float — its composition is not publicly known.
Stakes are not updated in real time. The date next to each entity is its last notification date, not today's date.