Security record
SION
Sionna Therapeutics, Inc. · Healthcare · Biotechnology
60Tracked holders
+8Δ holders
16.87MShares held
$740.62MReported value
+10New positions
−2Exits
Momentum inputs (comparable managers):
holder breadth +15.4% ·
share flow +15.6% ·
net new positions +13.3%
— formula
Broad accumulation — rising shares across more holders
All ownership figures: tracked 13F managers only, common-stock positions, reporting period Q2 2026
Ownership over time
Who holds it · Q2 2026
| # | Manager | Shares | Δ shares | Value | Their weight | Held | ||
|---|---|---|---|---|---|---|---|---|
| 1 | Viking Global Investors ✦ | 3.20M | 0.0% | $140.56M | 0.4% | Held | 6 | SEC ↗ |
| 2 | Adage Capital Partners ✦ | 1.60M | +966.7% | $70.38M | 0.1% | ▲ Add | 2 | SEC ↗ |
| 3 | BlackRock ✦ (passive) | 1.47M | +13.8% | $64.88M | 0.0% | ▲ Add | 5 | SEC ↗ ×8 |
| 4 | JPMorgan Chase ✦ | 1.49M | +1.7% | $64.09M | 0.0% | ▲ Add | 4 | SEC ↗ ×5 |
| 5 | Jennison Associates Llc | 1.17M | -19.2% | $51.56M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 6 | Citadel Advisors ✦ | 1.15M | -1.6% | $50.48M | 0.0% | ▼ Trim | 6 | SEC ↗ ×2 |
| 7 | Vanguard Capital Management Llc | 1.13M | +10.0% | $49.80M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 8 | State Street Global Advisors ✦ (passive) | 1.02M | +35.1% | $44.94M | 0.0% | ▲ Add | 6 | SEC ↗ |
| 9 | T. Rowe Price ✦ | 478.02K | -36.8% | $21.03M | 0.0% | ▼ Trim | 6 | SEC ↗ ×2 |
| 10 | Geode Capital Management ✦ (passive) | 457.14K | +17.3% | $20.11M | 0.0% | ▲ Add | 6 | SEC ↗ ×2 |
| 11 | Goldman Sachs Group ✦ | 388.81K | +47.7% | $17.10M | 0.0% | ▲ Add | 4 | SEC ↗ ×2 |
| 12 | Franklin Resources Inc | 290.11K | +65.3% | $12.76M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 13 | Aberdeen Group plc | 284.14K | -49.6% | $12.50M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 14 | Fidelity (FMR) ✦ | 278.29K | +241.9% | $12.24M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 15 | Millennium Management ✦ | 276.73K | +96.8% | $12.17M | 0.0% | ▲ Add | 6 | SEC ↗ |
| 16 | Artisan Partners Limited Partnership | 189.50K | New | $8.34M | 0.0% | New | 1 | SEC ↗ |
| 17 | Ensign Peak Advisors, Inc | 184.53K | -27.8% | $8.12M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 18 | Northern Trust Corp | 154.48K | +32.3% | $6.80M | 0.0% | ▲ Add | 3 | SEC ↗ ×3 |
| 19 | Morgan Stanley ✦ | 151.05K | +13.6% | $6.64M | 0.0% | ▲ Add | 4 | SEC ↗ ×6 |
| 20 | Qube Research & Technologies Ltd | 140.31K | +232.2% | $6.17M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 21 | Alyeska Investment Group, L.P. | 136.22K | 0.0% | $5.99M | 0.0% | Held | 3 | SEC ↗ |
| 22 | Charles Schwab Investment… | 129.75K | +7.9% | $5.71M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 23 | UBS Group AG | 116.21K | -21.3% | $5.11M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 24 | Citigroup Inc | 110.16K | +510.1% | $4.85M | 0.0% | ▲ Add | 3 | SEC ↗ ×2 |
| 25 | D. E. Shaw & Co. ✦ | 101.64K | New | $4.47M | 0.0% | New | 1 | SEC ↗ ×2 |
| 26 | Bank Of America Corp /De/ | 88.91K | +74.8% | $3.91M | 0.0% | ▲ Add | 3 | SEC ↗ ×2 |
| 27 | Ameriprise Financial Inc | 82.23K | +0.3% | $3.62M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 28 | Deutsche Bank Ag\ | 53.35K | +302.7% | $2.35M | 0.0% | ▲ Add | 3 | SEC ↗ ×3 |
| 29 | Point72 Asset Management ✦ | 49.33K | -63.9% | $2.17M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 30 | Td Asset Management Inc | 47.40K | -42.9% | $2.08M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 31 | Russell Investments Group, Ltd. | 42.26K | -12.7% | $1.86M | 0.0% | ▼ Trim | 3 | SEC ↗ ×4 |
| 32 | Bank of New York Mellon Corp | 41.59K | +23.1% | $1.83M | 0.0% | ▲ Add | 3 | SEC ↗ ×4 |
| 33 | Nuveen, LLC | 41.26K | +73.8% | $1.81M | 0.0% | ▲ Add | 3 | SEC ↗ ×2 |
| 34 | Wellington Management ✦ | 37.37K | -18.9% | $1.64M | 0.0% | ▼ Trim | 4 | SEC ↗ ×3 |
| 35 | Manufacturers Life Insurance… | 35.42K | -45.0% | $1.56M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 36 | Bnp Paribas Financial Markets | 31.80K | -21.6% | $1.40M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 37 | Swiss National Bank | 27.00K | New | $1.19M | 0.0% | New | 1 | SEC ↗ |
| 38 | New York State Common Retirement… | 23.59K | +345.0% | $1.04M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 39 | Alliancebernstein L.P. | 25.45K | +55.1% | $1.02M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 40 | Tudor Investment Corp Et Al | 22.57K | New | $993,074 | 0.0% | New | 1 | SEC ↗ |
| 41 | Rhumbline Advisers | 22.31K | +21.9% | $981,362 | 0.0% | ▲ Add | 3 | SEC ↗ |
| 42 | Wells Fargo & Company/Mn | 16.82K | +185.4% | $739,955 | 0.0% | ▲ Add | 3 | SEC ↗ ×2 |
| 43 | Marshall Wace ✦ | 12.60K | New | $554,230 | 0.0% | New | 1 | SEC ↗ |
| 44 | Invesco Ltd. | 12.42K | +15.1% | $546,267 | 0.0% | ▲ Add | 3 | SEC ↗ ×4 |
| 45 | UBS AM, a distinct business unit of… | 10.62K | +9056.9% | $467,262 | 0.0% | ▲ Add | 2 | SEC ↗ ×2 |
| 46 | MIRAE ASSET GLOBAL ETFS HOLDINGS… | 10.58K | +15.2% | $463,369 | 0.0% | ▲ Add | 3 | SEC ↗ ×2 |
| 47 | Legal & General Group Plc | 9.04K | +531.6% | $397,846 | 0.0% | ▲ Add | 3 | SEC ↗ ×3 |
| 48 | Barclays Plc | 6.50K | -64.7% | $285,715 | 0.0% | ▼ Trim | 3 | SEC ↗ ×3 |
| 49 | Squarepoint Ops LLC | 5.42K | -64.4% | $238,206 | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 50 | State Board Of Administration Of… | 5.21K | New | $229,408 | 0.0% | New | 1 | SEC ↗ |
| 51 | Sei Investments Co | 5.16K | New | $226,900 | 0.0% | New | 1 | SEC ↗ |
| 52 | Mirae Asset Global Investments Co.… | 2.02K | -13.3% | $88,816 | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 53 | Mitsubishi UFJ Asset Management… | 1.00K | New | $43,990 | 0.0% | New | 1 | SEC ↗ |
| 54 | Zurcher Kantonalbank (Zurich… | 709 | +91.1% | $31,189 | 0.0% | ▲ Add | 2 | SEC ↗ |
| 55 | Royal Bank Of Canada | 568 | +1793.3% | $25,000 | 0.0% | ▲ Add | 3 | SEC ↗ ×2 |
| 56 | Pacer Advisors, Inc. | 301 | New | $13,000 | 0.0% | New | 1 | SEC ↗ |
| 57 | Rockefeller Capital Management L.P. | 114 | -52.7% | $5,015 | 0.0% | ▼ Trim | 3 | SEC ↗ ×2 |
| 58 | Us Bancorp \De\ | 104 | +103.9% | $4,575 | 0.0% | ▲ Add | 3 | SEC ↗ |
| 59 | Pnc Financial Services Group, Inc. | 5 | -68.8% | $220 | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 60 | National Bank Of Canada /Fi/ | 2 | New | $88 | 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
| Artisan Partners Limited… | $8.34M | 0.0% |
| D. E. Shaw & Co. | $4.47M | 0.0% |
| Swiss National Bank | $1.19M | 0.0% |
| Tudor Investment Corp Et Al | $993,074 | 0.0% |
| Marshall Wace | $554,230 | 0.0% |
| State Board Of Administration… | $229,408 | 0.0% |
| Sei Investments Co | $226,900 | 0.0% |
| Mitsubishi UFJ Asset… | $43,990 | 0.0% |
| Pacer Advisors, Inc. | $13,000 | 0.0% |
| National Bank Of Canada /Fi/ | $88 | 0.0% |
Exited
| Susquehanna International… | $293,058 | was 0.0% |
| Two Sigma Investments | $220,495 | 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: Q2 2026 ·
Methodology ·
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