% 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 XXI 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 | SOFTBANK GROUP CORP. | 89,106,74889.1M | $570M | — | — |
| 2 | MORGAN STANLEY | 12,057,39512.1M | $77M | — | ADD 14% |
| 3 | CANTOR FITZGERALD, L. P. | 5,511,1995.5M | $35M | — | TRIM -3% |
| 4 | BlackRock, Inc. | 5,371,0025.4M | $34M | — | NEW |
| 5 | GEODE CAPITAL MANAGEMENT, LLC | 4,051,8344.1M | $26M | — | NEW |
| 6 | VANGUARD CAPITAL MANAGEMENT LLC | 3,867,9423.9M | $25M | — | NEW |
| 7 | UBS Group AG | 3,722,0923.7M | $24M | — | ADD 1487% |
| 8 | CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 2,767,6052.8M | $18M | — | NEW |
| 9 | Anson Funds Management LP | 2,543,0002.5M | $16M | — | NEW |
| 10 | VANGUARD FIDUCIARY TRUST CO | 1,832,2581.8M | $12M | — | NEW |
| 11 | STATE STREET CORP | 1,603,2251.6M | $10M | — | NEW |
| 12 | Shay Capital LLC | 1,138,8841.1M | $7M | — | — |
| 13 | NORTHERN TRUST CORP | 745,845745,845 | $5M | — | NEW |
| 14 | Amundi | 441,629441,629 | $3M | — | ADD 46% |
| 15 | Avenir Tech Ltd | 400,000400,000 | $3M | — | — |
| 16 | Pantera Capital Partners LP | 337,500337,500 | $2M | — | — |
| 17 | BANK OF AMERICA CORP /DE/ | 276,255276,255 | $2M | — | NEW |
| 18 | JANE STREET GROUP, LLC | 266,382266,382 | $2M | — | TRIM -90% |
| 19 | Alyeska Investment Group, L.P. | 250,000250,000 | $2M | — | NEW |
| 20 | SUSQUEHANNA INTERNATIONAL GROUP, LLP | 212,062212,062 | $1M | — | ADD 862% |
| 21 | Vanguard Global Advisers, LLC | 144,215144,215 | $922,976 | — | NEW |
| 22 | Weiss Asset Management LP | 142,579142,579 | $912,506 | — | NEW |
| 23 | Bank of New York Mellon Corp | 81,37981,379 | $520,826 | — | NEW |
| 24 | CITADEL ADVISORS LLC | 78,41778,417 | $501,869 | — | ADD 36% |
| 25 | Summit Trail Advisors, LLC | 62,50062,500 | $400,000 | — | — |
| 26 | WOLVERINE ASSET MANAGEMENT LLC | 59,98659,986 | $383,910 | — | NEW |
| 27 | GOLDMAN SACHS GROUP INC | 50,41850,418 | $322,675 | — | NEW |
| 28 | Marex Group plc | 44,40044,400 | $284,160 | — | ADD 54% |
| 29 | Virtu Financial LLC | 42,14142,141 | $270,000 | — | NEW |
| 30 | COMMONWEALTH EQUITY SERVICES, LLC | 38,37738,377 | $245,610 | — | NEW |
| 31 | Balyasny Asset Management L.P. | 38,20538,205 | $244,512 | — | NEW |
| 32 | Vontobel Holding Ltd. | 32,86932,869 | $210,362 | — | NEW |
| 33 | LPL Financial LLC | 30,28730,287 | $193,837 | — | TRIM -26% |
| 34 | Cetera Investment Advisers | 24,83324,833 | $158,931 | — | TRIM -49% |
| 35 | Invesco Ltd. | 23,44823,448 | $150,067 | — | NEW |
| 36 | PINNACLE ASSOCIATES LTD | 23,20023,200 | $148,480 | — | — |
| 37 | E6 Portfolios, LLC | 21,35121,351 | $136,649 | — | ADD 77% |
| 38 | Foundations Investment Advisors, LLC | 21,30421,304 | $136,346 | — | ADD 35% |
| 39 | BOKF, NA | 17,58017,580 | $112,512 | — | ADD 57% |
| 40 | CI INVESTMENTS INC. | 16,87216,872 | $107,981 | — | NEW |
| 41 | CITIGROUP INC | 16,46216,462 | $105,357 | — | NEW |
| 42 | HighTower Advisors, LLC | 14,53014,530 | $92,990 | — | ADD 20% |
| 43 | EVEXIA WEALTH LLC | 12,53912,539 | $87,522 | — | ADD 18% |
| 44 | OSAIC HOLDINGS, INC. | 12,69112,691 | $81,197 | — | TRIM -25% |
| 45 | BARCLAYS PLC | 12,65912,659 | $81,018 | — | NEW |
| 46 | RED REEF ADVISORS LLC | 11,25011,250 | $72,000 | — | NEW |
| 47 | Kovack Advisors, Inc. | 11,14511,145 | $70,239 | — | TRIM -23% |
| 48 | XTX Topco Ltd | 10,71210,712 | $68,557 | — | TRIM -37% |
| 49 | CAPSTONE INVESTMENT ADVISORS, LLC | 10,67610,676 | $68,326 | — | NEW |
| 50 | Rockefeller Capital Management L.P. | 8,0008,000 | $51,200 | — | NEW |
| 51 | GROUP ONE TRADING LLC | 3,6283,628 | $23,219 | — | TRIM -95% |
| 52 | Quantbot Technologies LP | 1,8971,897 | $12,141 | — | NEW |
| 53 | BURKETT FINANCIAL SERVICES, LLC | 1,7871,787 | $11,436 | — | — |
| 54 | Advisory Services Network, LLC | 1,2501,250 | $8,000 | — | NEW |
| 55 | American Capital Advisory, LLC | 1,2001,200 | $7,680 | — | ADD 20% |
| 56 | Farther Finance Advisors, LLC | 1,1481,148 | $6,970 | — | ADD 56% |
| 57 | Quarry LP | 964964 | $6,170 | — | NEW |
| 58 | CWM, LLC | 693693 | $4,435 | — | — |
| 59 | INTERNATIONAL ASSETS INVESTMENT MANAGEMENT, LLC | 600600 | $3,642 | — | — |
| 60 | Sound Income Strategies, LLC | 564564 | $3,423 | — | — |
| 61 | CENTRAL TRUST Co | 400400 | $2,560 | — | ADD 38% |
| 62 | WOLFF WIESE MAGANA LLC | 372372 | $2,381 | — | — |
| 63 | Elequin Capital, LP | 234234 | $1,498 | — | TRIM -43% |
| 64 | Glass Jacobson Investment Advisors llc | 210210 | $1,344 | — | — |
| 65 | Creative Capital Management Investments LLC | 192192 | $1,229 | — | ADD 109% |
| 66 | AdvisorNet Financial, Inc | 181181 | $1,158 | — | ADD 2% |
| 67 | ROYAL BANK OF CANADA | 200200 | $1,000 | — | — |
| 68 | Allworth Financial LP | 138138 | $884 | — | — |
| 69 | MAI Capital Management | 100100 | $640 | — | — |
| 70 | Ascentis Wealth Management, LLC | 1313 | $83 | — | TRIM -89% |
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 |
|---|---|---|---|---|---|---|---|
| SOFTBANK GROUP CORP. | — | — | — | — | 89.1M | 89.1M | $570M |
| MORGAN STANLEY | — | — | — | — | 10.6M | 12.1M | $77M |
| CANTOR FITZGERALD, L. P. | — | — | — | — | 5.7M | 5.5M | $35M |
| BlackRock, Inc. | — | — | — | — | — | 5.4M | $34M |
| GEODE CAPITAL MANAGEMENT, LLC | — | — | — | — | — | 4.1M | $26M |
| VANGUARD CAPITAL MANAGEMENT LLC | — | — | — | — | — | 3.9M | $25M |
| UBS Group AG | — | — | — | — | 235K | 3.7M | $24M |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | — | — | — | — | — | 2.8M | $18M |
| Anson Funds Management LP | — | — | — | — | — | 2.5M | $16M |
| VANGUARD FIDUCIARY TRUST CO | — | — | — | — | — | 1.8M | $12M |
| STATE STREET CORP | — | — | — | — | — | 1.6M | $10M |
| Shay Capital LLC | — | — | — | — | 1.1M | 1.1M | $7M |
| NORTHERN TRUST CORP | — | — | — | — | — | 746K | $5M |
| Amundi | — | — | — | — | 302K | 442K | $3M |
| Avenir Tech Ltd | — | — | — | — | 400K | 400K | $3M |
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 | 70 | 137,633,653 | — | $881M |
| 2025-Q4 | 60 | 111,176,056 | — | $974M |
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 | |
|---|---|---|---|
| BlackRock, Inc. | +5,371,002 | $34M | OPEN |
| GEODE CAPITAL MANAGEMENT, LLC | +4,051,834 | $26M | OPEN |
| VANGUARD CAPITAL MANAGEMENT LLC | +3,867,942 | $25M | OPEN |
| UBS Group AG | +3,487,519 | $22M | ADD |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | +2,767,605 | $18M | OPEN |
| Biggest sellers | Δ shares | Δ value | |
|---|---|---|---|
| JANE STREET GROUP, LLC | −2,337,239 | $15M | TRIM |
| CANTOR FITZGERALD, L. P. | −178,648 | $1M | TRIM |
| MARSHALL WACE, LLP | −122,300 | $782,720 | CLOSE |
| GROUP ONE TRADING LLC | −70,719 | $452,602 | TRIM |
| Brevan Howard Capital Management LP | −53,025 | $339,360 | 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).
