Security record · archived quarter
SION
Sionna Therapeutics, Inc. · Healthcare · Biotechnology
15Tracked holders
+3Δ holders
10.71MShares held
$314.89MReported value
+3New positions
−0Exits
Momentum inputs (comparable managers):
holder breadth +25.0% ·
share flow +8.2% ·
net new positions +20.0%
— formula
Broad accumulation — rising shares across more holders
All ownership figures: tracked 13F managers only, common-stock positions, reporting period Q3 2025
Ownership over time
| Quarter | Holders | Δ | Shares | Reported value | New | Exits |
|---|---|---|---|---|---|---|
| Q2 2026 | 60 | +8 | 16.87M | $740.62M | +10 | −2 |
| Q1 2026 | 54 | +1 | 14.59M | $579.96M | +6 | −5 |
| Q4 2025 | 53 | 0 | 13.47M | $554.19M | +2 | −2 |
| Q3 2025 | 15 | +3 | 10.71M | $314.89M | +3 | — |
| Q2 2025 | 9 | -1 | 5.91M | $102.50M | +1 | −2 |
| Q1 2025 | 8 | +8 | 4.63M | $48.42M | +8 | — |
Who holds it · Q3 2025
| # | Manager | Shares | Δ shares | Value | Their weight | Held | ||
|---|---|---|---|---|---|---|---|---|
| 1 | JPMorgan Chase ✦ | 3.96M | — | $116.38M | 0.0% | n/c | 1 | SEC ↗ |
| 2 | JPMorgan Chase ✦ | 3.96M | — | $116.38M | 0.0% | n/c | 1 | SEC ↗ |
| 3 | JPMorgan Chase ✦ | 3.96M | — | $116.38M | 0.0% | n/c | 1 | SEC ↗ |
| 4 | JPMorgan Chase ✦ | 3.96M | — | $116.38M | 0.0% | n/c | 1 | SEC ↗ |
| 5 | JPMorgan Chase ✦ | 3.96M | — | $116.38M | 0.0% | n/c | 1 | SEC ↗ |
| 6 | JPMorgan Chase ✦ | 3.96M | — | $116.38M | 0.0% | n/c | 1 | SEC ↗ |
| 7 | Viking Global Investors ✦ | 3.20M | 0.0% | $93.97M | 0.2% | Held | 3 | SEC ↗ |
| 8 | The Vanguard Group ✦ (passive) | 1.14M | +81.3% | $33.62M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 9 | The Vanguard Group ✦ (passive) | 1.14M | +81.3% | $33.62M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 10 | The Vanguard Group ✦ (passive) | 1.14M | +81.3% | $33.62M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 11 | BlackRock ✦ (passive) | 844.61K | +32.6% | $24.84M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 12 | BlackRock ✦ (passive) | 844.61K | +32.6% | $24.84M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 13 | BlackRock ✦ (passive) | 844.61K | +32.6% | $24.84M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 14 | BlackRock ✦ (passive) | 844.61K | +32.6% | $24.84M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 15 | BlackRock ✦ (passive) | 844.61K | +32.6% | $24.84M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 16 | BlackRock ✦ (passive) | 844.61K | +32.6% | $24.84M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 17 | BlackRock ✦ (passive) | 844.61K | +32.6% | $24.84M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 18 | T. Rowe Price ✦ | 637.76K | -25.9% | $18.76M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 19 | T. Rowe Price ✦ | 637.76K | -25.9% | $18.76M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 20 | Geode Capital Management ✦ (passive) | 316.56K | +9.4% | $9.31M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 21 | Geode Capital Management ✦ (passive) | 316.56K | +9.4% | $9.31M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 22 | State Street Global Advisors ✦ (passive) | 240.20K | +92.9% | $7.06M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 23 | Millennium Management ✦ | 214.09K | +1425.5% | $6.30M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 24 | Wellington Management ✦ | 42.23K | New | $1.24M | 0.0% | New | 1 | SEC ↗ |
| 25 | Wellington Management ✦ | 42.23K | New | $1.24M | 0.0% | New | 1 | SEC ↗ |
| 26 | Wellington Management ✦ | 42.23K | New | $1.24M | 0.0% | New | 1 | SEC ↗ |
| 27 | Citadel Advisors ✦ | 35.92K | -72.3% | $1.06M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 28 | Marshall Wace ✦ | 30.10K | New | $885,328 | 0.0% | New | 1 | SEC ↗ |
| 29 | Morgan Stanley ✦ | 22.84K | — | $671,636 | 0.0% | n/c | 1 | SEC ↗ |
| 30 | Morgan Stanley ✦ | 22.84K | — | $671,636 | 0.0% | n/c | 1 | SEC ↗ |
| 31 | Morgan Stanley ✦ | 22.84K | — | $671,636 | 0.0% | n/c | 1 | SEC ↗ |
| 32 | Morgan Stanley ✦ | 22.84K | — | $671,636 | 0.0% | n/c | 1 | SEC ↗ |
| 33 | Morgan Stanley ✦ | 22.84K | — | $671,636 | 0.0% | n/c | 1 | SEC ↗ |
| 34 | Morgan Stanley ✦ | 22.84K | — | $671,636 | 0.0% | n/c | 1 | SEC ↗ |
| 35 | Renaissance Technologies ✦ | 14.60K | -43.9% | $429,386 | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 36 | Goldman Sachs Group ✦ | 12.18K | — | $358,155 | 0.0% | n/c | 1 | SEC ↗ |
| 37 | Fidelity (FMR) ✦ | 234 | New | $6,882 | 0.0% | New | 1 | SEC ↗ |
“Their weight” = the position's share of that manager's reported 13F equity value — the conviction measure. ✦ = curated manager.
New buyers
| Wellington Management | $1.24M | 0.0% |
| Wellington Management | $1.24M | 0.0% |
| Wellington Management | $1.24M | 0.0% |
| Marshall Wace | $885,328 | 0.0% |
| Fidelity (FMR) | $6,882 | 0.0% |
Exited
| No tracked exits this quarter. |
Full-market context: across ALL 13F filers (SEC structured data, Q1 2026): 121 holders, 43.94M shares, $1.73B reported. This is a different, older period than the tracked-universe figures above and the two are never mixed.
Frequently co-owned
What else this security's tracked holders most often hold — shared-ownership counts, not fundamental relationships.
Provenance: Ownership from parsed 13F common-stock positions (tracked universe, comparable sets for changes); insider rows from Forms 3/4/5; stakes from Schedules 13D/13G; every filing links to its original on SEC EDGAR.
Reporting period: Q3 2025 ·
Methodology ·
Get this via the API