% 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 SIXS 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 | HighTower Advisors, LLC | 2,267,7082.3M | $118M | — | ADD 6% |
| 2 | TWO SIGMA INVESTMENTS, LP | 6,4006,400 | $332,480 | — | ADD 42% |
| 3 | Advisory Services Network, LLC | 3,5453,545 | $184,163 | — | NEW |
| 4 | UBS Group AG | 435435 | $22,598 | — | TRIM -53% |
| 5 | MORGAN STANLEY | 11 | $86 | — | — |
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 |
|---|---|---|---|---|---|---|---|
| HighTower Advisors, LLC | 1.8M | 1.9M | 2.0M | 2.1M | 2.1M | 2.3M | $118M |
| TWO SIGMA INVESTMENTS, LP | — | 6K | 6K | — | 5K | 6K | $332,480 |
| Advisory Services Network, LLC | — | — | — | — | — | 4K | $184,163 |
| UBS Group AG | 464 | 758 | — | — | 917 | 435 | $22,598 |
| MORGAN STANLEY | 1 | — | — | 1 | 1 | 1 | $86 |
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 | |
|---|---|---|---|
| HighTower Advisors, LLC | +131,261 | $7M | ADD |
| Advisory Services Network, LLC | +3,545 | $184,163 | OPEN |
| TWO SIGMA INVESTMENTS, LP | +1,900 | $98,705 | ADD |
| Biggest sellers | Δ shares | Δ value | |
|---|---|---|---|
| GTS SECURITIES LLC | −18,166 | $943,724 | CLOSE |
| Wealth Alliance Advisory Group, LLC | −14,118 | $733,430 | CLOSE |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | −6,424 | $333,727 | CLOSE |
| UBS Group AG | −482 | $25,040 | 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).
| Quarter | Holders | Shares held | % shares out | Value held |
|---|---|---|---|---|
| 2026-Q1 | 5 | 2,278,089 | — | $118M |
| 2025-Q4 | 7 | 2,180,573 | — | $111M |
| 2025-Q3 | 2 | 2,076,119 | — | $103M |
| 2025-Q2 | 3 | 2,056,236 | — | $96M |
| 2025-Q1 | 3 | 1,934,216 | — | $91M |
| 2024-Q4 | 6 | 1,881,834 | — | $93M |
| 2024-Q3 | 2 | 1,778,036 | — | $87M |
| 2024-Q2 | 2 | 1,681,102 | — | $76M |
| 2024-Q1 | 4 | 1,583,386 | — | $75M |
| 2023-Q4 | 5 | 1,478,853 | — | $70M |
| 2023-Q3 | 2 | 1,457,430 | — | $62M |
| 2023-Q2 | 2 | 1,499,296 | — | $63M |
| 2023-Q1 | 2 | 1,490,599 | — | $62M |
| 2022-Q4 | 2 | 1,449,773 | — | $61M |
| 2022-Q3 | 1 | 1,419,933 | — | $53M |
| 2022-Q2 | 2 | 1,398,239 | — | $58M |
| 2022-Q1 | 3 | 1,348,464 | — | $64M |
| 2021-Q4 | 2 | 1,243,441 | — | $65M |
| 2021-Q3 | 1 | 1,227,086 | — | $58M |
| 2021-Q2 | 2 | 1,157,995 | — | $55M |
| 2021-Q1 | 2 | 1,055,192 | — | $49M |
| 2020-Q4 | 3 | 933,826 | — | $35M |
| 2020-Q3 | 2 | 780,778 | — | $23M |
| 2020-Q2 | 2 | 703,289 | — | $20M |
