Nanobiotix S.A. (NBTX) Ownership
NBTX ownership summary
as of October 18, 2026- Institutions
- 12.0% of shares outstanding
- Insiders
- 0.00% of shares outstanding
- Shares outstanding
- 50.9M
- Float
- 35.1M shares available to trade
- Short interest
- 0.39% 147K shares short
- Days to cover
- 1.10 short interest down 16.5% vs prior month
- Institutions 11.95%
- Other investors 88.05%
NBTX top institutional holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | Johnson & Johnson | 11.04% | 5.6M | $119.8M | — | June 30, 2026 |
| 2 | Morgan Stanley - Brokerage Accounts | 0.10% | 50K | $1.1M | +13,515 (+37.3%) | June 30, 2026 |
| 3 | Jane Street Group LLC | 0.06% | 32K | $685,434 | +32,180 (0.0%) | June 30, 2026 |
| 4 | HRT FINANCIAL LLC | 0.05% | 27K | $582,172 | +27,332 (0.0%) | June 30, 2026 |
| 5 | XTX Topco Ltd | 0.03% | 16K | $337,712 | +15,855 (0.0%) | June 30, 2026 |
| 6 | Optiver Holding B.V. | 0.03% | 14K | $290,340 | +130 (+1.0%) | June 30, 2026 |
| 7 | Marshall Wace Asset Management Ltd | 0.02% | 10K | $213,937 | +805 (+8.7%) | June 30, 2026 |
| 8 | Citadel Advisors Llc | 0.01% | 6,042 | $128,695 | +6,042 (0.0%) | June 30, 2026 |
| 9 | BNP Paribas Arbitrage, SA | 0.01% | 4,044 | $86,137 | +485 (+13.6%) | June 30, 2026 |
| 10 | UBS Group AG | 0.01% | 2,577 | $54,890 | −2,980 (−53.6%) | June 30, 2026 |
| 11 | Royal Bank of Canada | <0.01% | 2,189 | $46,626 | +364 (+19.9%) | June 30, 2026 |
| 12 | JPMorgan Chase & Co | <0.01% | 1,706 | $36,338 | +1,706 (0.0%) | June 30, 2026 |
| 13 | Rhumbline Advisers | <0.01% | 1,502 | $31,993 | −779 (−34.2%) | June 30, 2026 |
| 14 | GAMMA Investing LLC | <0.01% | 985 | $20,980 | +157 (+19.0%) | June 30, 2026 |
| 15 | Advisor Group Holdings, Inc. | <0.01% | 500 | $10,650 | — | June 30, 2026 |
| 16 | Wells Fargo & Co | <0.01% | 200 | $4,260 | — | June 30, 2026 |
| 17 | Stone House Investment Management, LLC | <0.01% | 76 | $1,619 | +76 (0.0%) | June 30, 2026 |
| 18 | Federation des caisses Desjardins du Quebec | <0.01% | 56 | $1,193 | +56 (0.0%) | June 30, 2026 |
| 19 | NATIONAL BANK OF CANADA /FI/ | 0.00% | 13 | $277 | — | June 30, 2026 |
| 20 | EverSource Wealth Advisors, LLC | 0.00% | — | — | −514 (−100.0%) | June 30, 2026 |
Value at the latest close. Change = shares bought or sold in the latest quarterly filing (13F). In the top 20, 13 holders added 99K shares and 3 cut 4,273.
NBTX top mutual fund and ETF holders
3 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | Fidelity Nasdaq Composite Index | 0.01% | 4,489 | $95,616 | — | August 31, 2026 |
| 2 | ActivePassive International Equity ETF | <0.01% | 2,439 | $51,951 | — | September 30, 2026 |
| 3 | Steward Values Enhanced International I | <0.01% | 1,048 | $22,322 | — | August 31, 2026 |
Funds report holdings monthly or quarterly; dates differ by fund.
NBTX shares outstanding
Year-end shares outstanding, adjusted for splits.
Who owns NBTX
Institutional investors own 12.0% of Nanobiotix's shares and insiders 0.00%. The largest holder is Johnson & Johnson with 11.04% of the shares (5.6M), as of June 30, 2026. Among the top 20 institutions, 13 added shares and 3 reduced their stake in the latest filings. Short interest is 0.39% of the float, or 1.10 days of average trading volume. The share count rose 240.3% since 2014.
Related: NBTX analyst forecast, NBTX key metrics. See the NBTX stock overview for the latest quote and news.
NBTX ownership FAQ
Who owns the most Nanobiotix stock?
The largest shareholders of Nanobiotix are Johnson & Johnson (11.04%), Morgan Stanley - Brokerage Accounts (0.10%), Jane Street Group LLC (0.06%), HRT FINANCIAL LLC (0.05%), XTX Topco Ltd (0.03%).
What percentage of Nanobiotix is owned by institutions?
Institutions hold 12.0% of Nanobiotix's shares outstanding; insiders hold 0.00%.
Which funds own Nanobiotix?
The largest fund holders of Nanobiotix are Fidelity Nasdaq Composite Index (0.01%), ActivePassive International Equity ETF (<0.01%), Steward Values Enhanced International I (<0.01%).
What is Nanobiotix's short interest?
147K shares of Nanobiotix were sold short, 0.39% of the float; at the average daily volume it would take 1.10 days to cover.
How many shares of Nanobiotix are outstanding?
Nanobiotix has 50.9M shares outstanding, of which 35.1M are in the public float.