% of shares outstanding is not shown for NEBX: this is a fund line, and we hold no cover-page share count for it at any quarter — a fund's shares outstanding move with creations and redemptions rather than with issuance and buybacks, and it is not the SEC cover-page count this percentage is defined against. The figure is withheld rather than computed against a count that does not exist. Holder share counts are shown as filed.
Crowding percentile withheld — no market cap for NEBX in the served universe — the cohort is size-matched, and an unmatched percentile would compare a micro-cap register to a mega-cap one.
| # | Holder | Shares | Value | % of shares out | Δ QoQ |
|---|---|---|---|---|---|
| 1 | UBS Group AG | 150,510150,510 | $5M | — | ADD 24215% |
| 2 | CITADEL ADVISORS LLC | 49,18149,181 | $2M | — | ADD 20% |
| 3 | IMC-Chicago, LLC | 34,15034,150 | $1M | — | NEW |
| 4 | MIRAE ASSET SECURITIES (USA) INC. | 30,00030,000 | $966,000 | — | NEW |
| 5 | Optiver Holding B.V. | 16,20916,209 | $521,930 | — | NEW |
| 6 | GOLDMAN SACHS GROUP INC | 13,24213,242 | $426,392 | — | NEW |
| 7 | RENAISSANCE TECHNOLOGIES LLC | 11,10011,100 | $357,420 | — | ADD 9% |
| 8 | Belvedere Trading LLC | 7,8217,821 | $251,836 | — | NEW |
| 9 | HOLLENCREST CAPITAL MANAGEMENT | 1717 | $547 | — | — |
| 10 | MORGAN STANLEY | 11 | $32 | — | NEW |
Rows rank by the value each filer reported — 13F filers price their own positions, so a holder with fewer shares can rank just above one with more.
| Holder | 2024-Q4 | 2025-Q1 | 2025-Q2 | 2025-Q3 | 2025-Q4 | 2026-Q1 | Latest value |
|---|---|---|---|---|---|---|---|
| UBS Group AG | — | — | — | — | 619 | 151K | $5M |
| CITADEL ADVISORS LLC | — | — | — | 5K | 41K | 49K | $2M |
| IMC-Chicago, LLC | — | — | — | — | — | 34K | $1M |
| MIRAE ASSET SECURITIES (USA) INC. | — | — | — | — | — | 30K | $966,000 |
| Optiver Holding B.V. | — | — | — | — | — | 16K | $521,930 |
| GOLDMAN SACHS GROUP INC | — | — | — | — | — | 13K | $426,392 |
| RENAISSANCE TECHNOLOGIES LLC | — | — | — | — | 10K | 11K | $357,420 |
| Belvedere Trading LLC | — | — | — | 4K | — | 8K | $251,836 |
| HOLLENCREST CAPITAL MANAGEMENT | — | — | — | 7 | 17 | 17 | $547 |
| MORGAN STANLEY | — | — | — | — | — | 1 | $32 |
Shares reported each quarter by the largest current holders. Green = added vs the prior filing, red = trimmed, grey = roughly held; a dash is a quarter with no 13F on file (a gap is skipped, not read as an exit). 13F is filed up to 45 days after quarter-end. Up to 40 quarters (10 years) available — use the selector above.
Holder count only — too few computable %-of-shares-outstanding quarters for a % pane. Line breaks are quarters with no 13F record, never interpolated.
| Quarter | Holders | Shares held | % shares out | Value held |
|---|---|---|---|---|
| 2026-Q1 | 10 | 312,231 | — | $10M |
| 2025-Q4 | 8 | 81,791 | — | $2M |
| 2025-Q3 | 11 | 56,676 | — | $4M |
Short interest has its own tab now — open SI →
Source: SEC Form 13F — every institution manager (≥ $100M in 13F securities) reporting a long US-listed position, across ~10,250 filers over 10 years of history. 13F is long-only, US-listed, filed up to 45 days after quarter-end.
| Biggest buyers | Δ shares | Δ value | |
|---|---|---|---|
| UBS Group AG | +149,891 | $2M | ADD |
| IMC-Chicago, LLC | +34,150 | $366,543 | OPEN |
| MIRAE ASSET SECURITIES (USA) INC. | +30,000 | $322,000 | OPEN |
| Optiver Holding B.V. | +16,209 | $173,977 | OPEN |
| GOLDMAN SACHS GROUP INC | +13,242 | $142,131 | OPEN |
| Biggest sellers | Δ shares | Δ value | |
|---|---|---|---|
| Essex LLC | −10,905 | $117,047 | CLOSE |
| Jump Financial, LLC | −9,007 | $96,675 | CLOSE |
| Tower Research Capital LLC (TRC) | −5,379 | $57,735 | CLOSE |
| GROUP ONE TRADING LLC | −4,607 | $49,448 | CLOSE |
The 2025-Q4 register is as-filed in ITS OWN share basis; every count below was rebased into the 2026-Q1 basis (no split in between, factor 1). Dollar figures value the SHARE delta at one price — the 2026-03-31 close — rather than differencing two filings' own reported values, which would mix the quarter's price move into the trade figure.
13Fs disclose LONG US-listed positions only — shorts, most derivatives, bonds and non-US listings are invisible here, and a filer's quarter-over-quarter change is not necessarily a trade (index rebalances, in-kind transfers and entity successions all read as flow).
