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SION — SIONNA THERAPEUTICS INC

Reported value held$516.67M
Funds holding (latest)34
SectorHealth Care
Funds holding (Q2 2026)28
Institutional value$463.80M · 11.05M sh
New / Add / Cut / Exit4 / 16 / 7 / 2
Top-5 / Top-10 concentration73.4% / 89.4%
Institutional holdings change Accumulating +31.7% (+2.66M sh)
Institutional value change Up +51.4%

As of Q2 2026, 28 SEC-registered investment managers reported holding SION (SIONNA THERAPEUTICS INC) in their latest 13F filings, with a combined reported value of $463.80M across 11.05M shares. That is +31.7% by share count (+2.66M shares) versus the previous quarter, while reported value moved +51.4%. Ownership is concentrated: the five largest holders account for 73.4% of reported value and the top ten for 89.4%.

Compared with the prior quarter, 4 opened new positions, 16 added to existing stakes, 7 trimmed, 2 exited entirely. 13F holdings are quarter-end snapshots, so these moves reflect positioning as of Q2 2026, not real-time trading.

SION is classified in the Health Care sector.

All figures on this page are computed from SEC Form 13F quarterly filings. 13F filers disclose long positions of $100,000 or more within 45 days of quarter end; short positions, options overlays and intra-quarter trades are not included, so treat the numbers as a quarterly snapshot of institutional ownership rather than real-time positioning.

FundQuarterSharesValuePortfolio WeightChange
Viking Global Investors history Q2 2026 3.20M $140.56M 0.41% Hold
BlackRock Inc history Q2 2026 1.47M $64.88M 0.00% Add
JPMorgan Chase & Co history Q2 2026 1.49M $64.09M 0.01% New
Citadel Advisors history Q2 2026 1.16M $50.85M 0.01% Reduce
Vanguard Group history Q4 2025 1.18M $48.75M 0.00% Add
Geode Capital Management history Q2 2026 457.14K $20.11M 0.00% Add
Casdin Capital history Q2 2026 400.00K $17.60M 0.88% New
Goldman Sachs Group history Q2 2026 388.81K $17.10M 0.00% Add
Millennium Management history Q2 2026 325.33K $14.31M 0.01% Add
Franklin Resources history Q2 2026 290.11K $12.76M 0.00% Add
Fidelity Management & Research (FMR) history Q2 2026 278.29K $12.24M 0.00% Add
Northern Trust Corp history Q2 2026 154.48K $6.80M 0.00% Add
Morgan Stanley history Q2 2026 151.05K $6.64M 0.00% Add
Charles Schwab Investment Management history Q2 2026 129.75K $5.71M 0.00% Add
UBS Group AG history Q2 2026 116.21K $5.11M 0.00% Reduce
Citigroup Inc history Q2 2026 110.16K $4.85M 0.00% Add
D. E. Shaw & Co history Q2 2026 101.64K $4.47M 0.00% New
Bank of America Corp history Q2 2026 88.91K $3.91M 0.00% Add
Deutsche Bank AG history Q2 2026 53.35K $2.35M 0.00% Add
Prudential Financial history Q2 2025 135.19K $2.35M 0.00% Add

View all 34 fund holders →

New Positions (Q2 2026)

Fully Exited (vs previous quarter)

Fund Position History — shares by quarter (top 20 funds)

FundQ1 2025Q2 2025Q3 2025Q4 2025Q1 2026Q2 2026
Viking Global Investors 2.95M 3.20M 3.20M 3.20M 3.20M 3.20M
BlackRock Inc 198.40K 637.10K 844.61K 1.29M 1.30M 1.47M
JPMorgan Chase & Co 2.17M 2.22M 1.98M 1.23M — 1.49M
Citadel Advisors 326.50K 129.91K 35.92K 1.09M 1.17M 1.16M
Geode Capital Management 135.56K 289.27K 316.56K 380.04K 389.87K 457.14K
Casdin Capital — — — — — 400.00K
Goldman Sachs Group 63.74K 46.05K 12.18K 36.27K 263.17K 388.81K
Millennium Management 179.07K 14.03K 214.09K 80.55K 140.64K 325.33K
Franklin Resources 500.02K 500.02K 242.15K 175.48K 175.48K 290.11K
Fidelity Management & Research (FMR) — — 234 384 81.39K 278.29K
Northern Trust Corp 26.82K 91.89K 97.71K 112.12K 116.78K 154.48K
Morgan Stanley 3.94K 44.02K 22.84K 49.88K 133.02K 151.05K
Charles Schwab Investment Management 64.64K 92.83K 111.50K 123.69K 120.25K 129.75K
UBS Group AG 11.15K 51.37K 46.67K 89.18K 147.64K 116.21K
Citigroup Inc — 4.38K 687 5.18K 18.06K 110.16K
D. E. Shaw & Co — — — 5.74K — 101.64K
Bank of America Corp 8.74K 6.01K 6.54K 43.57K 50.87K 88.91K
Deutsche Bank AG — 9.60K 9.60K 10.03K 13.25K 53.35K
Point72 Asset Management — — — — 136.55K 49.33K
BNY Mellon — 24.13K 27.46K 35.13K 33.78K 41.59K

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