% of shares outstanding is not shown for AMUN: 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 AMUN 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 | SUSQUEHANNA INTERNATIONAL GROUP, LLP | 50,91950,919 | $1M | — | ADD 130% |
| 2 | CITADEL ADVISORS LLC | 42,91742,917 | $1M | — | NEW |
| 3 | Cambridge Investment Research Advisors, Inc. | 8,6818,681 | $226,000 | — | NEW |
| 4 | CBIZ Investment Advisory Services, LLC | 5,1755,175 | $134,948 | — | — |
| 5 | JONES FINANCIAL COMPANIES LLLP | 5,1675,167 | $134,730 | — | NEW |
| 6 | AdvisorNet Financial, Inc | 3,6503,650 | $95,174 | — | NEW |
| 7 | FMR LLC | 704704 | $18,344 | — | TRIM -30% |
| 8 | UBS Group AG | 164164 | $4,276 | — | 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 |
|---|---|---|---|---|---|---|---|
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | — | — | — | — | 22K | 51K | $1M |
| CITADEL ADVISORS LLC | — | — | — | — | — | 43K | $1M |
| Cambridge Investment Research Advisors, Inc. | — | — | — | — | — | 9K | $226,000 |
| CBIZ Investment Advisory Services, LLC | — | — | — | — | 5K | 5K | $134,948 |
| JONES FINANCIAL COMPANIES LLLP | — | — | — | — | — | 5K | $134,730 |
| AdvisorNet Financial, Inc | — | — | — | — | — | 4K | $95,174 |
| FMR LLC | — | — | — | — | 1K | 704 | $18,344 |
| UBS Group AG | — | — | — | — | — | 164 | $4,276 |
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 | 8 | 117,377 | — | $3M |
| 2025-Q4 | 6 | 64,474 | — | $2M |
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 | |
|---|---|---|---|
| CITADEL ADVISORS LLC | +42,917 | $1M | OPEN |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | +28,747 | $749,578 | ADD |
| Cambridge Investment Research Advisors, Inc. | +8,681 | $226,357 | OPEN |
| JONES FINANCIAL COMPANIES LLLP | +5,167 | $134,730 | OPEN |
| AdvisorNet Financial, Inc | +3,650 | $95,174 | OPEN |
| Biggest sellers | Δ shares | Δ value | |
|---|---|---|---|
| LPL Financial LLC | −17,508 | $456,521 | CLOSE |
| JANE STREET GROUP, LLC | −16,332 | $425,857 | CLOSE |
| OSAIC HOLDINGS, INC. | −2,306 | $60,129 | CLOSE |
| FMR LLC | −301 | $7,849 | TRIM |
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).
