Tenaris SA (TNRSF) shareholders
TNRSFOTCSteel Works, Blast Furnaces & Rolling Mills (Coke Ovens)Also trades as TS
$28.12+0.00 (0.00%)
Close on Oct 19, 2026Market cap $30.86BP/E –Yield –
Ownership
Who owns Tenaris's shares
Held by institutions
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Shares held, 13F filers
Institutional holders
–
Net institutional buying
–
Insider trades, 12 months
0 buys · 0 sales
Open-market trades only
Holders of more than 5%
Latest Schedule 13D (active) or 13G (passive) filed by each holder
| Holder | Shares | % of class | Filing | As of |
|---|---|---|---|---|
| Rocca & Partners Stichting Administratiekantoor Aandelen San Faustin Joint filing with San Faustin S.A. (68.60%), Techint Holdings S.A R.L. (68.60%) | 692,085,486 | 68.60% | 13D (active) amendment | Feb 6, 2026 |
Short interest
Shares sold short and not yet bought back, as of Oct 15, 2026 (FINRA, reported twice a month)
Short % of shares outstanding
–
3M shares short
Days to cover
1000.0
Change since last report
+23.4%
From 3M shares
Short volume, 0 days
–
Of volume reported to FINRA
Shares sold short, last 12 months
Short sale volume counts trades marked short on any given day, including market-maker hedging, so it runs far higher than the share of Tenaris's stock actually held short. No settlement fails above the SEC's reporting threshold in the last 90 days.
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