% of shares outstanding not shown: no SEC cover-page share count falls within 120 days of the 2026-Q1 quarter end, so any percentage would rest on a count that cannot speak for this quarter. Holder share counts are shown as filed.
Crowding percentile withheld — no market cap for ZOMDF 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 | Jackson Wealth Management, LLC | 639,510639,510 | $76,000 | — | — |
| 2 | Advisory Services Network, LLC | 295,900295,900 | $35,330 | — | — |
| 3 | Ancora Advisors LLC | 83,61083,610 | $9,983 | — | TRIM -72% |
| 4 | CoreCap Advisors, LLC | 4,8004,800 | $573 | — | — |
| 5 | GILL CAPITAL PARTNERS, LLC | 2,7192,719 | $325 | — | NEW |
| 6 | HARBOUR INVESTMENTS, INC. | 2,2002,200 | $263 | — | NEW |
| 7 | Sound Income Strategies, LLC | 1,0001,000 | $112 | — | — |
| 8 | Bogart Wealth, LLC | 680680 | $81 | — | ADD 278% |
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 |
|---|---|---|---|---|---|---|---|
| Jackson Wealth Management, LLC | 143K | 143K | — | 640K | 640K | 640K | $76,000 |
| Advisory Services Network, LLC | 192K | 297K | 297K | 297K | 294K | 296K | $35,330 |
| Ancora Advisors LLC | — | 4.7M | 4.6M | 820K | 300K | 84K | $9,983 |
| CoreCap Advisors, LLC | 8K | — | 5K | 5K | 5K | 5K | $573 |
| GILL CAPITAL PARTNERS, LLC | — | — | — | — | — | 3K | $325 |
| HARBOUR INVESTMENTS, INC. | — | — | — | — | — | 2K | $263 |
| Sound Income Strategies, LLC | — | — | — | 1K | 1K | 1K | $112 |
| Bogart Wealth, LLC | 180 | 180 | 180 | 180 | 180 | 680 | $81 |
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.
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 | |
|---|---|---|---|
| GILL CAPITAL PARTNERS, LLC | +2,719 | — | OPEN |
| HARBOUR INVESTMENTS, INC. | +2,200 | — | OPEN |
| Advisory Services Network, LLC | +1,800 | — | — |
| Bogart Wealth, LLC | +500 | — | ADD |
| Biggest sellers | Δ shares | Δ value | |
|---|---|---|---|
| Ancora Advisors LLC | −216,390 | — | TRIM |
| EverSource Wealth Advisors, LLC | −10 | — | 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 quarter-end close — rather than differencing two filings' own reported values, which would mix the quarter's price move into the trade figure. No licensed quarter-end close is stored for this line, so the dollar columns are withheld; share counts stand.
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).
| Quarter | Holders | Shares held | % shares out | Value held |
|---|---|---|---|---|
| 2026-Q1 | 8 | 1,030,419 | — | $122,667 |
| 2025-Q4 | 7 | 1,239,600 | — | $126,088 |
| 2025-Q3 | 9 | 1,781,696 | — | $140,508 |
| 2025-Q2 | 10 | 5,192,834 | — | $209,175 |
| 2025-Q1 | 23 | 6,970,824 | — | $429,421 |
| 2024-Q4 | 92 | 91,949,362 | — | $11M |
| 2024-Q3 | 85 | 81,261,052 | — | $11M |
| 2024-Q2 | 97 | 84,573,222 | — | $12M |
| 2024-Q1 | 98 | 85,030,389 | — | $12M |
| 2023-Q4 | 93 | 88,871,006 | — | $18M |
| 2023-Q3 | 88 | 84,096,046 | — | $14M |
| 2023-Q2 | 93 | 97,387,713 | — | $19M |
| 2023-Q1 | 91 | 96,740,449 | — | $20M |
| 2022-Q4 | 92 | 93,502,050 | — | $15M |
| 2022-Q3 | 88 | 92,412,992 | — | $19M |
| 2022-Q2 | 98 | 94,673,891 | — | $21M |
| 2022-Q1 | 112 | 113,972,042 | — | $38M |
| 2021-Q4 | 107 | 125,506,855 | — | $39M |
| 2021-Q3 | 106 | 120,302,889 | — | $63M |
| 2021-Q2 | 105 | 130,774,604 | — | $110M |
| 2021-Q1 | 101 | 101,465,454 | — | $160M |
| 2020-Q4 | 34 | 48,000,427 | — | $11M |
| 2020-Q3 | 1 | 166 | — | $0 |
| 2020-Q2 | 1 | 166 | — | $0 |
| 2020-Q1 | 1 | 166 | — | $0 |
| 2019-Q4 | 1 | 166 | — | $0 |
| 2019-Q3 | 1 | 166 | — | $0 |
| 2019-Q2 | 1 | 166 | — | $0 |
| 2019-Q1 | 1 | 166 | — | $0 |
