% 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 ARIDX 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 | Broderick Brian C | 11,00011,000 | $56,210 | — | — |
| 2 | Coston, McIsaac & Partners | 471471 | $2,000 | — | — |
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 |
|---|---|---|---|---|---|---|---|
| Broderick Brian C | — | 11K | 11K | 11K | 11K | 11K | $56,210 |
| Coston, McIsaac & Partners | 354 | 360 | 366 | 372 | 465 | 471 | $2,000 |
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.
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 | |
|---|---|---|---|
| Coston, McIsaac & Partners | +6 | $31 | — |
| Biggest sellers | Δ shares | Δ value | |
|---|---|---|---|
| No filer reduced its position this quarter. | |||
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).
| % shares out |
|---|
| Value held |
|---|
| 2026-Q1 | 2 | 11,471 | — | $58,210 |
| 2025-Q4 | 2 | 11,465 | — | $57,000 |
| 2025-Q3 | 2 | 11,372 | — | $69,650 |
| 2025-Q2 | 2 | 11,366 | — | $69,210 |
| 2025-Q1 | 2 | 11,360 | — | $69,320 |
| 2024-Q4 | 1 | 354 | — | $2,000 |
| 2024-Q3 | 1 | 203 | — | $2,000 |
| 2024-Q2 | 1 | 201 | — | $1,000 |
| 2024-Q1 | 1 | 199 | — | $1,000 |
| 2023-Q4 | 1 | 198 | — | $1,000 |
| 2023-Q3 | 1 | 192 | — | $1,000 |
| 2023-Q2 | 2 | 14,616 | — | $135,872 |
| 2023-Q1 | 1 | 190 | — | $1,000 |
| 2022-Q4 | 1 | 189 | — | $1,000 |
| 2022-Q3 | 1 | 167 | — | $1,000 |
