% of shares outstanding not shown: this line files 20-F annual reports only — a foreign private issuer whose US listing trades as ADSs (depositary receipts), while its cover-page share count is in ORDINARY shares. The depositary ratio is not in our data. The count we hold for this line is 48,020,885 shares (as of 2025-12-31, source dei). Dividing one by the other is wrong by the whole ratio (a 5:1 ADR reads one fifth of the true percentage), so the percentage is withheld rather than served wrong. Holder share counts are shown as filed.
Crowding percentile withheld — no market cap for ZENA 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 | Vident Advisory, LLC | 981,671981,671 | $2M | — | ADD 931% |
| 2 | MORGAN STANLEY | 467,968467,968 | $1M | — | ADD 257% |
| 3 | DNB Asset Management AS | 434,487434,487 | $1M | — | ADD 120% |
| 4 | SUSQUEHANNA INTERNATIONAL GROUP, LLP | 429,501429,501 | $983,557 | — | ADD 12% |
| 5 | SEB Asset Management AB | 150,712150,712 | $345,130 | — | NEW |
| 6 | UBS Group AG | 148,591148,591 | $340,273 | — | ADD 229% |
| 7 | Caitong International Asset Management Co., Ltd | 111,677111,677 | $255,740 | — | ADD 2474% |
| 8 | BlackRock, Inc. | 64,26064,260 | $147,156 | — | ADD 147% |
| 9 | WEALTH EFFECTS LLC | 63,00063,000 | $144,270 | — | ADD 31% |
| 10 | IMC-Chicago, LLC | 55,18655,186 | $126,376 | — | NEW |
| 11 | Prospera Financial Services Inc | 29,50029,500 | $67,554 | — | NEW |
| 12 | Steward Partners Investment Advisory, LLC | 26,89026,890 | $61,578 | — | NEW |
| 13 | GROUP ONE TRADING LLC | 22,55322,553 | $51,646 | — | ADD 61% |
| 14 | LPL Financial LLC | 22,36422,364 | $51,214 | — | ADD 82% |
| 15 | Virtu Financial LLC | 20,52820,528 | $47,000 | — | NEW |
| 16 | GEODE CAPITAL MANAGEMENT, LLC | 17,41917,419 | $39,889 | — | — |
| 17 | Cetera Investment Advisers | 15,58515,585 | $35,690 | — | NEW |
| 18 | Squarepoint Ops LLC | 15,41515,415 | $35,300 | — | NEW |
| 19 | BANK OF AMERICA CORP /DE/ | 14,00014,000 | $32,060 | — | ADD 8437% |
| 20 | Engineers Gate Manager LP | 13,74313,743 | $31,471 | — | NEW |
| 21 | Cambridge Investment Research Advisors, Inc. | 12,19812,198 | $28,000 | — | ADD 20% |
| 22 | JANE STREET GROUP, LLC | 11,71711,717 | $26,832 | — | TRIM -80% |
| 23 | Advisory Services Network, LLC | 11,69811,698 | $26,788 | — | TRIM -14% |
| 24 | ROYAL BANK OF CANADA | 10,85510,855 | $25,000 | — | ADD 9% |
| 25 | Focus Financial Network, Inc. | 10,00010,000 | $22,900 | — | TRIM -3% |
| 26 | SIMPLEX TRADING, LLC | 9,5789,578 | $21,933 | — | NEW |
| 27 | BARCLAYS PLC | 9,1919,191 | $21,047 | — | TRIM -18% |
| 28 | Allworth Financial LP | 2,0002,000 | $4,580 | — | — |
| 29 | Delos Wealth Advisors, LLC | 1,0501,050 | $2,405 | — | NEW |
| 30 | Federation des caisses Desjardins du Quebec | 1,0001,000 | $2,290 | — | NEW |
| 31 | Farther Finance Advisors, LLC | 1,0001,000 | $2,040 | — | — |
| 32 | NFSG Corp | 800800 | $1,832 | — | ADD 60% |
| 33 | SHP Wealth Management | 450450 | $1,030 | — | — |
| 34 | WELLS FARGO & COMPANY/MN | 325325 | $744 | — | — |
| 35 | Hilton Head Capital Partners, LLC | 237237 | $543 | — | — |
| 36 | HARBOUR INVESTMENTS, INC. | 100100 | $229 | — | — |
| 37 | JONES FINANCIAL COMPANIES LLLP | 100100 | $206 | — | TRIM -70% |
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 |
|---|---|---|---|---|---|---|---|
| Vident Advisory, LLC | — | — | — | 111K | 95K | 982K | $2M |
| MORGAN STANLEY | 56K | 51K | 22K | 76K | 131K | 468K | $1M |
| DNB Asset Management AS | — | — | 49K | 145K | 197K | 434K | $1M |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | — | — | — | 296K | 382K | 430K | $983,557 |
| SEB Asset Management AB | — | — | — | — | — | 151K | $345,130 |
| UBS Group AG | 30K | 7K | 3K | 10K | 45K | 149K | $340,273 |
| Caitong International Asset Management Co., Ltd | — | — | 1 | — | 4K | 112K | $255,740 |
| BlackRock, Inc. | — | — | 16K | 17K | 26K | 64K | $147,156 |
| WEALTH EFFECTS LLC | — | — | — | 23K | 48K | 63K | $144,270 |
| IMC-Chicago, LLC | — | — | — | — | — | 55K | $126,376 |
| Prospera Financial Services Inc | — | — | — | — | — | 30K | $67,554 |
| Steward Partners Investment Advisory, LLC | — | — | — | — | — | 27K | $61,578 |
| GROUP ONE TRADING LLC | — | — | 13K | 26K | 14K | 23K | $51,646 |
| LPL Financial LLC | — | — | 10K | 15K | 12K | 22K | $51,214 |
| Virtu Financial LLC | — | — | — | 28K | — | 21K | $47,000 |
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 | 37 | 3,187,349 | — | $7M |
| 2025-Q4 | 36 | 1,554,990 | — | $5M |
| 2025-Q3 | 34 | 1,235,398 | — | $6M |
| 2025-Q2 | 17 | 233,992 | — | $855,846 |
| 2025-Q1 | 6 | 87,468 | — | $224,956 |
| 2024-Q4 | 10 | 189,830 | — | $1M |
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 | |
|---|---|---|---|
| Vident Advisory, LLC | +886,448 | $2M | ADD |
| MORGAN STANLEY | +336,852 | $771,391 | ADD |
| DNB Asset Management AS | +237,349 | $543,529 | ADD |
| SEB Asset Management AB | +150,712 | $345,130 | OPEN |
| Caitong International Asset Management Co., Ltd | +107,339 | $245,806 | ADD |
| Biggest sellers | Δ shares | Δ value | |
|---|---|---|---|
| 683 Capital Management, LLC | −128,126 | $293,409 | CLOSE |
| Skandinaviska Enskilda Banken AB (publ) | −121,261 | $277,688 | CLOSE |
| OMERS ADMINISTRATION Corp | −120,900 | $276,861 | CLOSE |
| JANE STREET GROUP, LLC | −47,982 | $109,879 | TRIM |
| PharVision Advisers, LLC | −40,188 | $92,031 | 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).
