Ranked by reported Q1 2026 13F market value
Share of total reported institutional value in NBTX held by the largest 10 / 25 filers.
| # | Institution | Shares Held | Market Value | QoQ Change | Ownership % | % of Fund |
|---|---|---|---|---|---|---|
| 1 | JOHNSON & JOHNSON | 5.6M | $173.6M | 0.0% | 11.622% | 26.61% |
| 2 | MORGAN STANLEY | 36K | $1.1M | +58.2% | 0.075% | 0.00% |
| 3 | Optiver Holding B.V. | 14K | $417K | -16.8% | 0.028% | 0.02% |
| 4 | MARSHALL WACE, LLP | 9K | $285K | -2.8% | 0.019% | 0.00% |
| 5 | UBS Group AG | 6K | $172K | +263.2% | 0.011% | 0.00% |
| 6 | BNP PARIBAS ARBITRAGE, SA | 4K | $110K | -1.1% | 0.007% | 0.00% |
| 7 | RHUMBLINE ADVISERS | 2K | $70K | -2.6% | 0.005% | 0.00% |
| 8 | ROYAL BANK OF CANADA | 2K | $56K | -30.5% | 0.004% | 0.00% |
| 9 | EverSource Wealth Advisors, LLC | 882 | $46K | +71.6% | 0.002% | 0.00% |
| 10 | GAMMA Investing LLC | 828 | $26K | +261.6% | 0.002% | 0.00% |
| 11 | ADVISOR GROUP HOLDINGS, INC. | 500 | $15K | 0.0% | 0.001% | 0.00% |
| 12 | WELLS FARGO & COMPANY/MN | 200 | $6K | 0.0% | 0.000% | 0.00% |
| 13 | NATIONAL BANK OF CANADA /FI/ | 13 | $394 | 0.0% | 0.000% | 0.00% |
| 14 | CITIGROUP INC | 1 | $31 | — | 0.000% | 0.00% |
| 15 | Tower Research Capital LLC (TRC) | 1 | $31 | — | 0.000% | 0.00% |
denotes a marquee investor (Buffett, Burry, ARK, Tiger Global, Pershing Square, Baupost and other widely-followed managers). “% of Fund” shows how much of that investor’s total 13F portfolio is invested in NBTX — a direct measure of their conviction.
Filings activity in NBTX during Q1 2026, grouped by how each filer changed its position.
Institutions that opened a new NBTX position in Q1 2026
Institutions that fully closed their NBTX position in Q1 2026
8 quarters of 13F filings · Δ columns show change vs prior quarter
| Quarter | Inst. Holders | Δ Holders | Ownership % | Δ Ownership | Total 13F Value | Δ Value |
|---|---|---|---|---|---|---|
| Q1 2026 | 15 | +7.1% | 10.23% | +2.57 pp | $176M | +33% |
| Q4 2025 | 14 | +27% | 7.66% | +1.46 pp | $132M | +24% |
| Q3 2025 | 11 | +0.0% | 6.20% | +4.71 pp | $107M | +317% |
| Q2 2025 | 11 | 15% | 1.49% | +0.29 pp | $26M | +24% |
| Q1 2025 | 13 | 32% | 1.20% | +0.19 pp | $21M | +18% |
| Q4 2024 | 19 | +73% | 1.01% | 1.14 pp | $17M | 53% |
| Q3 2024 | 11 | 15% | 2.15% | 0.55 pp | $37M | 21% |
| Q2 2024 | 13 | — | 2.70% | — | $46M | — |
Source: SEC 13F institutional filings. Ownership % requires market cap data and will show once linked. Δ columns compare to the immediately prior filed quarter.
Quick answers to the most common questions about buying NBTX stock.
Based on Q1 2026 13F filings, institutional ownership of Nanobiotix S.A. stands at 10.2%, held across 15 reporting institutions.
JOHNSON & JOHNSON is the largest reported institutional holder of NBTX, with approximately 5,623,816 shares worth $0.17B as of Q1 2026.
No marquee "smart money" managers (Berkshire, Burry, ARK, Tiger Global, Pershing Square, Baupost, etc.) currently appear among the top 25 institutional holders of NBTX.
Our composite Smart Money Score for NBTX is 52 out of 100 (Neutral). It combines net institutional buying activity, ownership shift, marquee investor presence, and holder-count growth.
2 institutions opened new positions in NBTX during Q1 2026, while 1 fully exited. 12 added to existing positions and 1 trimmed.
NBTX institutional ownership rose by 2.57 percentage points quarter-over-quarter, with a net change of +1 holders.
The top 10 institutions account for 100.0% of all reported 13F value in NBTX, and the top 25 account for 100.0%.
All data is sourced from SEC Form 13F filings, which institutional investment managers with at least $100M in assets are required to file each quarter. We process every 13F filing from EDGAR and recompute the aggregates after each cycle. Insider transactions are sourced from Form 4 filings.
Nanobiotix S.A. (NBTX) Institutional Ownership