Solid Biosciences Inc.
Solid Biosciences Inc. (SLDB) Stock Ownership
Institutional vs insider vs public ownership from 13F and float data — top holders, activity, and insider trades below.
SEC 13F · FMP · SLDB · as of Sep 30, 2025
Ownership Breakdown
131
Institutional Holders
▲ 17 vs Q2
$502.81M
Total Inst. Value
▲ $102.45M vs Q2
77.91M
Shares Outstanding
freeFloat 76.91%
81.49M
13F Shares Held
▼ 714,189 vs Q2
Institutional ownership = 13F shares ÷ total outstanding. Insider % = 100 − free float. Public % = free float − institution %. Data: FMP /symbol-positions-summary + /shares-float + SEC EDGAR.
Top Institutional Holders
SLDB largest shareholders · institutional ownership
Q3 2025 · SEC 13F
Showing top 10 holders
| Holder | Shares | % Owned | Weight | Value | Reported | Change |
|---|---|---|---|---|---|---|
PERCEPTIVE ADVISORS LLC biological products, (no diagnostic substances) | 11.83M | 12.57% | 12.57% | $73.01B | Nov 14, 2025 | ▼ 73.1K |
BAIN CAPITAL LIFE SCIENCES INVESTORS, LLC biological products, (no diagnostic substances) | 7.91M | 8.40% | 8.40% | $48.81B | Nov 14, 2025 | — held |
SIREN, L.L.C. biological products, (no diagnostic substances) | 7.42M | 7.88% | 7.88% | $45.76B | Nov 13, 2025 | — held |
RA CAPITAL MANAGEMENT, L.P. biological products, (no diagnostic substances) | 5.81M | 6.17% | 6.17% | $35.86B | Nov 14, 2025 | ▲ 100 |
BLACKROCK, INC. biological products, (no diagnostic substances) | 4.73M | 5.02% | 5.02% | $29.15B | Nov 12, 2025 | ▼ 195.0K |
ADAGE CAPITAL PARTNERS GP, L.L.C. biological products, (no diagnostic substances) | 4.00M | 4.25% | 4.25% | $24.68B | Nov 14, 2025 | ▼ 2.73M |
VANGUARD GROUP INC biological products, (no diagnostic substances) | 3.08M | 3.28% | 3.28% | $19.03B | Nov 7, 2025 | ▼ 281.7K |
VESTAL POINT CAPITAL, LP biological products, (no diagnostic substances) | 2.98M | 3.16% | 3.16% | $18.36B | Nov 14, 2025 | ▲ 1.47M |
FMR LLC biological products, (no diagnostic substances) | 2.91M | 3.10% | 3.10% | $17.98B | Nov 13, 2025 | ▼ 264.3K |
CITADEL ADVISORS LLC biological products, (no diagnostic substances) | 2.59M | 2.75% | 2.75% | $16.00B | Nov 14, 2025 | ▲ 69.4K |
Data from SEC Form 13F filings. Ownership bar normalised to largest holder. Change flags: isNew / isSoldOut / changeInSharesNumber (FMP extract-analytics/holder).
Institutional Activity
Q3 2025 vs prior quarter
Q3 2025
20
Increased
+5.08M shares4
New Positions
first time holders19
Decreased
−4.40M shares0
Sold Out
fully exitedNet shares change (top 50)
+685.4K
+5.08M / −4.40M
Net new holders
+5
4 new / 0 exited
Based on top 50 institutional holders by position size. Fields: isNew, isSoldOut, changeInSharesNumber (FMP extract-analytics/holder, limit=50).
Insider Buying vs Selling
SLDB insider trading · insider activity
Source: SEC Form 4
Insiders have been primarily selling shares recently. Selling may be driven by pre-scheduled Rule 10b5-1 plans rather than negative sentiment.
1
Buy transactions
1
Sell transactions
1.00
Buy/Sell ratio
$0M
Total disposed
Recent Insider Transactions
Showing 10 most recent · Common Stock only
| Name · Role | Date | Type | Shares | Price | Value | After Trans. | Filing |
|---|---|---|---|---|---|---|---|
Howton David T Chief Operating Officer | Jan 29, 2026 | Award | 79,341 | — | — | 79.3K | Form 4 ↗ |
Brooks Gabriel Chief Medical Officer | Jan 29, 2026 | Award | 58,847 | — | — | 58.8K | Form 4 ↗ |
Cumbo Alexander President and CEO | Jan 29, 2026 | Award | 169,401 | — | — | 169.4K | Form 4 ↗ |
Herzich Paul Chief Technology Officer | Jan 29, 2026 | Award | 54,925 | — | — | 54.9K | Form 4 ↗ |
Tan Kevin CFO & Treasurer | Jan 29, 2026 | Award | 56,647 | — | — | 56.6K | Form 4 ↗ |
Hanrahan Jessie Chief Regulatory Officer | Jan 29, 2026 | Award | 54,925 | — | — | 54.9K | Form 4 ↗ |
PERCEPTIVE ADVISORS LLC
| Mar 9, 2026 | Award | 8,912,655 | $0.00 | $8.9K | 8.91M | Form 4 ↗ |
Cumbo Alexander President and CEO | Feb 18, 2026 | Sale | 16,644 | $5.82 | $96.9K | 235.4K | Form 4 ↗ |
Hanrahan Jessie Chief Regulatory Officer | Feb 18, 2026 | Sale | 4,134 | $5.82 | $24.1K | 74.3K | Form 4 ↗ |
Ganot Ilan director | Feb 18, 2026 | Sale | 2,658 | $5.82 | $15.5K | 27.5K | Form 4 ↗ |
Source: /insider-trading/search (FMP stable). Buy/Sell direction: acquisitionOrDisposition A=Buy, D=Sell. RSU vesting (M-Exempt) excluded from sentiment bar. All data from SEC EDGAR public filings.
About institutional & insider ownership
Solid Biosciences Inc. (SLDB) is primarily owned by institutional investors, who hold approximately 100.0% of total shares outstanding. Company insiders own approximately 23.09%, while retail and public investors account for the remaining 0.00%.
The largest institutional shareholder of Solid Biosciences Inc. is PERCEPTIVE ADVISORS LLC, holding approximately 11.83 million shares — equal to 12.57% of outstanding shares — as of September 30, 2025.
A total of 131 institutional investors currently hold SLDB stock, with a combined institutional value of approximately $502,814,199 as of the most recent 13F filing period.
Frequently asked questions
SLDB ownershipSolid Biosciences Inc. (SLDB) is primarily owned by institutional investors, who hold approximately 100.0% of shares. The largest shareholder is PERCEPTIVE ADVISORS LLC with a 12.57% stake. Company insiders hold 23.09%. Data sourced from SEC Form 13F as of September 30, 2025.