Security record · archived quarter
SION
Sionna Therapeutics, Inc. · Healthcare · Biotechnology
53Tracked holders
0Δ holders
13.47MShares held
$554.19MReported value
+2New positions
−2Exits
Momentum inputs (comparable managers): holder breadth 0.0% · share flow -4.2% · net new positions 0.0% — formula
All ownership figures: tracked 13F managers only, common-stock positions, reporting period Q4 2025
Ownership over time
Who holds it · Q4 2025
| # | Manager | Shares | Δ shares | Value | Their weight | Held | ||
|---|---|---|---|---|---|---|---|---|
| 1 | Viking Global Investors ✦ | 3.20M | 0.0% | $131.45M | 0.3% | Held | 4 | SEC ↗ |
| 2 | BlackRock ✦ (passive) | 1.29M | +52.9% | $53.14M | 0.0% | ▲ Add | 3 | SEC ↗ ×8 |
| 3 | JPMorgan Chase ✦ | 1.23M | -68.9% | $50.68M | 0.0% | ▼ Trim | 2 | SEC ↗ ×4 |
| 4 | The Vanguard Group ✦ (passive) | 1.18M | +3.7% | $48.75M | 0.0% | ▲ Add | 3 | SEC ↗ ×3 |
| 5 | Jennison Associates Llc | 1.12M | — | $45.88M | 0.0% | n/c | 1 | SEC ↗ |
| 6 | Citadel Advisors ✦ | 1.09M | +2926.8% | $44.73M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 7 | Aberdeen Group plc | 839.96K | — | $34.56M | 0.1% | n/c | 1 | SEC ↗ |
| 8 | T. Rowe Price ✦ | 831.37K | +30.4% | $34.20M | 0.0% | ▲ Add | 4 | SEC ↗ ×2 |
| 9 | State Street Global Advisors ✦ (passive) | 693.39K | +188.7% | $28.53M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 10 | Geode Capital Management ✦ (passive) | 380.04K | +20.1% | $15.64M | 0.0% | ▲ Add | 4 | SEC ↗ ×2 |
| 11 | Franklin Resources Inc | 175.48K | — | $7.22M | 0.0% | n/c | 1 | SEC ↗ |
| 12 | Alyeska Investment Group, L.P. | 136.22K | — | $5.60M | 0.0% | n/c | 1 | SEC ↗ |
| 13 | Charles Schwab Investment… | 123.69K | — | $5.09M | 0.0% | n/c | 1 | SEC ↗ |
| 14 | Td Asset Management Inc | 113.35K | — | $4.66M | 0.0% | n/c | 1 | SEC ↗ |
| 15 | Northern Trust Corp | 112.12K | — | $4.61M | 0.0% | n/c | 1 | SEC ↗ ×3 |
| 16 | Invesco Ltd. | 111.16K | — | $4.57M | 0.0% | n/c | 1 | SEC ↗ ×3 |
| 17 | Ameriprise Financial Inc | 101.64K | — | $4.18M | 0.0% | n/c | 1 | SEC ↗ |
| 18 | UBS Group AG | 89.18K | — | $3.67M | 0.0% | n/c | 1 | SEC ↗ ×3 |
| 19 | Millennium Management ✦ | 80.55K | -62.4% | $3.31M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 20 | Ensign Peak Advisors, Inc | 79.86K | — | $3.29M | 0.0% | n/c | 1 | SEC ↗ |
| 21 | Manufacturers Life Insurance… | 69.42K | — | $2.87M | 0.0% | n/c | 1 | SEC ↗ |
| 22 | Morgan Stanley ✦ | 49.88K | +118.4% | $2.05M | 0.0% | ▲ Add | 2 | SEC ↗ ×6 |
| 23 | Barclays Plc | 48.17K | — | $1.98M | 0.0% | n/c | 1 | SEC ↗ |
| 24 | Bank Of America Corp /De/ | 43.57K | — | $1.79M | 0.0% | n/c | 1 | SEC ↗ ×3 |
| 25 | Wellington Management ✦ | 38.35K | -9.2% | $1.58M | 0.0% | ▼ Trim | 2 | SEC ↗ ×3 |
| 26 | Goldman Sachs Group ✦ | 36.27K | +197.8% | $1.49M | 0.0% | ▲ Add | 2 | SEC ↗ ×2 |
| 27 | Bank of New York Mellon Corp | 35.13K | — | $1.45M | 0.0% | n/c | 1 | SEC ↗ ×3 |
| 28 | Nuveen, LLC | 23.73K | — | $976,417 | 0.0% | n/c | 1 | SEC ↗ ×2 |
| 29 | Russell Investments Group, Ltd. | 21.94K | — | $902,688 | 0.0% | n/c | 1 | SEC ↗ ×4 |
| 30 | Rhumbline Advisers | 17.69K | — | $727,924 | 0.0% | n/c | 1 | SEC ↗ |
| 31 | Wells Fargo & Company/Mn | 17.55K | — | $722,048 | 0.0% | n/c | 1 | SEC ↗ ×2 |
| 32 | Squarepoint Ops LLC | 16.36K | — | $673,050 | 0.0% | n/c | 1 | SEC ↗ |
| 33 | Alliancebernstein L.P. | 15.62K | — | $642,607 | 0.0% | n/c | 1 | SEC ↗ |
| 34 | Deutsche Bank Ag\ | 10.03K | — | $412,593 | 0.0% | n/c | 1 | SEC ↗ ×2 |
| 35 | MIRAE ASSET GLOBAL ETFS HOLDINGS… | 8.91K | — | $367,124 | 0.0% | n/c | 1 | SEC ↗ ×2 |
| 36 | Two Sigma Investments ✦ | 6.40K | New | $263,296 | 0.0% | New | 1 | SEC ↗ |
| 37 | American Century Companies Inc | 6.18K | — | $254,245 | 0.0% | n/c | 1 | SEC ↗ |
| 38 | D. E. Shaw & Co. ✦ | 5.74K | New | $236,226 | 0.0% | New | 1 | SEC ↗ |
| 39 | New York State Common Retirement… | 5.30K | — | $218,042 | 0.0% | n/c | 1 | SEC ↗ |
| 40 | Citigroup Inc | 5.18K | — | $213,311 | 0.0% | n/c | 1 | SEC ↗ ×2 |
| 41 | ProShare Advisors LLC | 4.90K | — | $201,710 | 0.0% | n/c | 1 | SEC ↗ |
| 42 | Bnp Paribas Financial Markets | 2.26K | — | $93,141 | 0.0% | n/c | 1 | SEC ↗ |
| 43 | Mirae Asset Global Investments Co.… | 2.17K | — | $89,233 | 0.0% | n/c | 1 | SEC ↗ |
| 44 | Legal & General Group Plc | 1.68K | — | $69,197 | 0.0% | n/c | 1 | SEC ↗ |
| 45 | Balyasny Asset Management L.P. | 1.41K | — | $57,843 | 0.0% | n/c | 1 | SEC ↗ |
| 46 | California State Teachers… | 988 | — | $40,646 | 0.0% | n/c | 1 | SEC ↗ |
| 47 | Royal Bank Of Canada | 489 | — | $21,000 | 0.0% | n/c | 1 | SEC ↗ ×3 |
| 48 | Fidelity (FMR) ✦ | 384 | +64.1% | $15,798 | 0.0% | ▲ Add | 2 | SEC ↗ |
| 49 | Daiwa Securities Group Inc. | 149 | — | $6,000 | 0.0% | n/c | 1 | SEC ↗ |
| 50 | Cwm, Llc | 80 | — | $3,000 | 0.0% | n/c | 1 | SEC ↗ |
| 51 | Us Bancorp \De\ | 65 | — | $2,674 | 0.0% | n/c | 1 | SEC ↗ |
| 52 | Rockefeller Capital Management L.P. | 48 | — | $1,975 | 0.0% | n/c | 1 | SEC ↗ |
| 53 | Pnc Financial Services Group, Inc. | 5 | — | $206 | 0.0% | n/c | 1 | SEC ↗ |
“Their weight” = the position's share of that manager's reported 13F equity value — the conviction measure. ✦ = curated manager.
New buyers
| Two Sigma Investments | $263,296 | 0.0% |
| D. E. Shaw & Co. | $236,226 | 0.0% |
Exited
| Marshall Wace | $885,328 | was 0.0% |
| Renaissance Technologies | $429,386 | was 0.0% |
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.
Open-market purchases (P)
No open-market insider purchases in our coverage window.
Open-market sales (S)
Sep 17
RA CAPITAL MANAGEMENT, L.P.
Director, 10% owner · 3.42M sh · $21.58M
Sep 17
RA CAPITAL MANAGEMENT, L.P.
Director, 10% owner · 33.80K sh · $252,148
Awards, exercises and tax withholding are never counted as buys or sales here. Methodology
Sep 21
SC 13D/A — RA CAPITAL MANAGEMENT, L.P.
14.3% of class · View original SEC filing ↗
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: Q4 2025 ·
Methodology ·
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