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SION · Sionna Therapeutics, Inc.

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$46.55 +1.17 (+2.58%) At close · Jul 28
Market Cap
$2.10B
Shares
45.15M

Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.

The Jun 30, 2026 filing window is still open — showing the latest known positions. Funds that have not filed yet carry their prior-quarter positions; a fund that filed without this stock counts as sold out.
Holders: 123
Total Value: $1,814,769,452
Total Shares: 45,265,429
Showing 1–100 of 123 holdings by value · page 1 of 2

Institutional Ownership Trend

6 quarters

Superinvestors Holding SION

All superinvestors →
Andreas Halvorsen $128,094,806

Holder Concentration

Across 121 13F filers
Top Holder
21.9%
Mar 2025 → Mar 2026 · range 21.9% – 25.2%
of institutional value
Top 5
57.7%
Mar 2025 → Mar 2026 · range 57.7% – 66.2%
of institutional value
Top 10
75.1%
Mar 2025 → Mar 2026 · range 75.1% – 84.9%
of institutional value
HHI
931
Mar 2025 → Mar 2026 · range 931 – 1,200
Broadly held
Showing 100 of 123
All Common Calls Puts
Export CSV
Holder Value (USD) % of 13F Shares Open
Mid RA CAPITAL MANAGEMENT, L.P. $397,093,254 21.88% 9,905,045
Mid TPG GP A, LLC $260,383,026 14.35% 6,494,962
Mid ORBIMED ADVISORS LLC $141,545,843 7.80% 3,530,702
Large VIKING GLOBAL INVESTORS LP $128,094,806 7.06% 3,195,181
Small Atlas Venture Life Science Advisors, LLC $120,093,684 6.62% 2,995,602
Small ENAVATE SCIENCES GP, LLC $99,344,222 5.47% 2,478,030
Mega JPMORGAN CHASE & CO $58,732,410 3.24% 1,465,014
Mega JENNISON ASSOCIATES LLC $58,179,409 3.21% 1,451,220
Mega BlackRock, Inc. $51,951,303 2.86% 1,295,867
Mega CITADEL ADVISORS LLC $46,782,263 2.58% 1,166,931
Mega VANGUARD CAPITAL MANAGEMENT LLC $41,272,534 2.27% 1,029,497
Mid DEERFIELD MANAGEMENT COMPANY, L.P. $38,910,953 2.14% 970,590
Mega PRICE T ROWE ASSOCIATES INC /MD/ $30,323,113 1.67% 756,376
Mega STATE STREET CORP $30,317,140 1.67% 756,227
Mid PERCEPTIVE ADVISORS LLC $26,396,819 1.45% 658,439
Mid EVENTIDE ASSET MANAGEMENT, LLC $25,879,297 1.43% 645,530
Large Aberdeen Group plc $22,617,775 1.25% 564,175
Large BAKER BROS. ADVISORS LP $16,036,000 0.88% 400,000
Mega GEODE CAPITAL MANAGEMENT, LLC $15,629,968 0.86% 389,872
Mid Siren, L.L.C. $12,027,000 0.66% 300,000
Small Sio Capital Management, LLC $11,800,090 0.65% 294,340
Mid Soleus Capital Management, L.P. $11,766,415 0.65% 293,500
Mega GOLDMAN SACHS GROUP INC $10,550,644 0.58% 263,174
Large Ensign Peak Advisors, Inc $10,248,447 0.56% 255,636
Large Candriam S.C.A. $9,493,833 0.52% 236,813
Small Kalehua Capital Management LLC $7,900,616 0.44% 197,072
Mega FRANKLIN RESOURCES INC $7,035,113 0.39% 175,483
Large ADAGE CAPITAL PARTNERS GP, L.L.C. $6,013,500 0.33% 150,000
Mega UBS Group AG $5,918,927 0.33% 147,641
Small SUPERSTRING CAPITAL MANAGEMENT LP $5,653,652 0.31% 141,024
Mega MILLENNIUM MANAGEMENT LLC $5,638,297 0.31% 140,641
Large Point72 Asset Management, L.P. $5,474,249 0.30% 136,549
Large Alyeska Investment Group, L.P. $5,461,139 0.30% 136,222
Small GordonMD Global Investments LP $5,452,240 0.30% 136,000
Mega MORGAN STANLEY $5,332,889 0.29% 133,023
Mega CHARLES SCHWAB INVESTMENT MANAGEMENT INC $4,820,942 0.27% 120,253
Small Artia Global Partners LP $4,800,416 0.26% 119,741
Mega NORTHERN TRUST CORP Bank $4,681,548 0.26% 116,776
Mega VANGUARD FIDUCIARY TRUST CO Bank $4,497,095 0.25% 112,175
Mid Rock Springs Capital Management LP $3,986,108 0.22% 99,429
Small Rhenman & Partners Asset Management AB $3,507,875 0.19% 87,500
Mega TD Asset Management Inc $3,327,309 0.18% 82,996
Mega AMERIPRISE FINANCIAL INC $3,286,337 0.18% 81,974
Mega FMR LLC $3,263,125 0.18% 81,395
Large Driehaus Capital Management LLC $3,072,216 0.17% 76,633
Mega MANUFACTURERS LIFE INSURANCE COMPANY, THE Insurance $2,584,121 0.14% 64,458
Mega BANK OF AMERICA CORP /DE/ Bank $2,039,378 0.11% 50,870
Mid Integral Health Asset Management, LLC $2,004,500 0.11% 50,000
Mid SEVEN GRAND MANAGERS, LLC $2,004,500 0.11% 50,000
Small Ishara Investments LP $1,972,428 0.11% 49,200
Large Russell Investments Group, Ltd. $1,941,116 0.11% 48,419
Mega WELLINGTON MANAGEMENT GROUP LLP $1,847,306 0.10% 46,079
Large Qube Research & Technologies Ltd $1,693,481 0.09% 42,242
Mega BNP PARIBAS ARBITRAGE, SA $1,626,451 0.09% 40,570
Small SILVERARC CAPITAL MANAGEMENT, LLC $1,580,227 0.09% 39,417
Large ALPS ADVISORS INC $1,468,416 0.08% 36,628
Small STEMPOINT CAPITAL LP $1,464,888 0.08% 36,540
Mega Bank of New York Mellon Corp Bank $1,354,158 0.07% 33,778
Large POLEN CAPITAL MANAGEMENT LLC $1,073,409 0.06% 26,775
Small Maven Securities LTD Broker-Dealer $1,002,250 0.06% 25,000
Mega Nuveen, LLC $951,495 0.05% 23,734
Mid XTX Topco Ltd $944,159 0.05% 23,551
Large Rafferty Asset Management, LLC $887,472 0.05% 22,137
Mega BARCLAYS PLC $737,053 0.04% 18,385
Mega RHUMBLINE ADVISERS $733,967 0.04% 18,308
Mega CITIGROUP INC $723,944 0.04% 18,058
Mega ALLIANCEBERNSTEIN L.P. $657,876 0.04% 16,410
Large Squarepoint Ops LLC $610,049 0.03% 15,217
Large Walleye Capital LLC $605,238 0.03% 15,097
Mega DEUTSCHE BANK AG\ Bank $531,151 0.03% 13,249
Mid Longaeva Partners L.P. $508,862 0.03% 12,693
Mid KENNEDY CAPITAL MANAGEMENT LLC $492,465 0.03% 12,284
Mega Vanguard Global Advisers, LLC $448,647 0.02% 11,191
Mega Invesco Ltd. $432,449 0.02% 10,787
Mid PROFUND ADVISORS LLC $398,454 0.02% 9,939
Large MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. Mutual Fund $368,226 0.02% 9,185
Large MetLife Investment Management, LLC $343,370 0.02% 8,565
Mid China Universal Asset Management Co., Ltd. $316,112 0.02% 7,186
Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP $293,057 0.02% 7,310
Large ExodusPoint Capital Management, LP $288,247 0.02% 7,190
Small VARCOV Co. $263,431 0.01% 6,571
Small Virtus Investment Advisers, LLC $255,533 0.01% 6,374
Small Quarry LP $252,727 0.01% 6,304
Large Hudson Bay Capital Management LP $247,756 0.01% 6,180
Large Police & Firemen's Retirement System of New Jersey Pension $239,217 0.01% 5,438
Mega WELLS FARGO & COMPANY/MN $236,289 0.01% 5,894
Mega TWO SIGMA INVESTMENTS, LP $220,495 0.01% 5,500
Mid INTECH INVESTMENT MANAGEMENT LLC $220,054 0.01% 5,489
Micro AlphaCentric Advisors LLC $213,923 0.01% 4,863
Large NEW YORK STATE COMMON RETIREMENT FUND Pension $212,477 0.01% 5,300
Large LOS ANGELES CAPITAL MANAGEMENT LLC $165,010 0.01% 4,116
Micro Cygnus Capital Advisors, LLC $152,342 0.01% 3,800
Large STRS OHIO $116,261 0.01% 2,900
Mid Tower Research Capital LLC (TRC) $94,291 0.01% 2,352
Large Mirae Asset Global Investments Co., Ltd. $88,815 0.00% 2,019
Mega Legal & General Group Plc $57,408 0.00% 1,432
Mid Ameritas Investment Partners, Inc. $52,197 0.00% 1,302
Mid GF FUND MANAGEMENT CO. LTD. $40,210 0.00% 1,003
Large CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM Pension $34,798 0.00% 868
Large Zurcher Kantonalbank (Zurich Cantonalbank) Bank $14,873 0.00% 371
Key facts CIK 2036042 CUSIP 829401108 13F (30d) 13 filings 13 filers Visit website Investor relations

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