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AC

Alexander Cumbo

SLDB
PRESIDENT AND CEO · SOLID BIOSCIENCES INC. · CIK 0001685994
FILING MIX · LIFETIME64%/36%
BUYS
25
SELLS
14
TOTAL VALUE
$1.12M
COMPANIES
4
ACTIVE SINCE
Feb 2020
HOLDINGS NOW
369,250
AVG SELL PX
$5.89
TRADE KIND
SHOWING 39 / 39
Trades · vs SPY
Loading price series…
Performance · forward returns vs SPY
7 backtested trades · 8 horizons · 13 pending
Forward-return performance of every backtestable P/S trade by Alexander Cumbo, measured at 8 horizons from 7 days to 2 years. Deduped per economic event so co-filings count once. Excess return = trade return minus SPY return over the same window.
HORIZONTRADESWIN RATEINSIDER RETURNSPY RETURNMEAN EXCESSMEDIAN EXCESST-STAT
7d7+28.57%+12.24%+0.22%+12.02%+6.90%—
14d7+42.86%+7.45%-0.36%+7.80%+3.88%—
30d7+28.57%+14.07%-2.27%+16.34%+5.54%—
60d7+28.57%+19.28%-1.08%+20.36%+22.21%—
90d7+28.57%+26.61%+3.30%+23.30%+1.85%—
180d7(3 pending)+25.00%+53.91%+7.06%+51.02%+59.67%—
1y7(4 pending)+0.00%+34.79%+20.05%+14.74%+16.56%—
2y7(6 pending)+0.00%+50.87%+52.74%-1.87%-1.87%—
How to read this: Insider Returnis the average raw return of the filer's trades over the horizon. SPY Return is what SPY did over those same windows — reference only, not a comparison. The headline alpha number is Mean Excess = Insider − SPY; green means the filer beat SPY, red means they trailed it. Win rate is the share of individual trades where the filer beat SPY. T-statvalues above 2 mean the alpha is unlikely to be chance given the sample size. "Pending" counts trades where the horizon hasn't elapsed yet; their stats are not included in the row average.
Holdings over time
SLDB · 235,405 shares · as of Feb 18, 2026
0127,463254,925382,388509,8502023202420252026SHARES HELD
Trading cadence · quarterly flow
BUY ● SELL ●
2020
2020
2020
2020
2021
2021
2021
2021
2022
2022
2022
2022
2023
2023
2023
2023
2024
2024
2024
2024
2025
2025
2025
2025
2026
2026
FLOW · 25 buys / 14 sellsCOVERAGE · 26 quarters
Form 4 filings · all activity
COMPANYTYPESHARESPRICEVALUEHELD AFTERTRADE DATEFILEDDETAILS
VOR
VOR BIOPHARMA INC.
PURCHASEGRANT
Stock grant
56,345——56,345Jun 11, 2026Jun 12, 2026 ↗View →
CLYM
CLIMB BIO, INC.
PURCHASEGRANT
Stock grant
40,000——40,000Jun 5, 2026Jun 8, 2026 ↗View →
SLDB
SOLID BIOSCIENCES INC.
SALE10b5-1
10b5-1 plan
16,644$5.82$96.9K235,405Feb 18, 2026Feb 18, 2026 ↗View →
SLDB
SOLID BIOSCIENCES INC.
SALE
President and CEO
30,031——60,063Feb 13, 2026Feb 18, 2026 ↗View →
SLDB
SOLID BIOSCIENCES INC.
PURCHASE
President and CEO
30,031——252,049Feb 13, 2026Feb 18, 2026 ↗View →
SLDB
SOLID BIOSCIENCES INC.
SALE10b5-1
10b5-1 plan
48,913$6.44$315.1K222,018Feb 4, 2026Feb 6, 2026 ↗View →
SLDB
SOLID BIOSCIENCES INC.
SALE10b5-1
10b5-1 plan
80,258$6.44$516.6K270,931Feb 2, 2026Feb 2, 2026 ↗View →
SLDB
SOLID BIOSCIENCES INC.
PURCHASE
President and CEO
100,400——351,189Jan 31, 2026Feb 2, 2026 ↗View →
SLDB
SOLID BIOSCIENCES INC.
SALE
President and CEO
100,400——301,200Jan 31, 2026Feb 2, 2026 ↗View →
SLDB
SOLID BIOSCIENCES INC.
PURCHASEGRANT
Stock grant
254,900——254,900Jan 29, 2026Feb 2, 2026 ↗View →
SLDB
SOLID BIOSCIENCES INC.
PURCHASEGRANT
Stock grant
509,850——509,850Jan 29, 2026Feb 2, 2026 ↗View →
SLDB
SOLID BIOSCIENCES INC.
SALE
President and CEO
169,401——0Jan 29, 2026Feb 2, 2026 ↗View →
SLDB
SOLID BIOSCIENCES INC.
PURCHASE
President and CEO
169,401——250,789Jan 29, 2026Feb 2, 2026 ↗View →
SLDB
SOLID BIOSCIENCES INC.
PURCHASEGRANT
Stock grant
169,401——169,401Jan 29, 2026Apr 21, 2026 ↗View →
SLDB
SOLID BIOSCIENCES INC.
SALE10b5-1
10b5-1 plan
10,808$5.11$55.2K81,388Dec 3, 2025Dec 4, 2025 ↗View →
SLDB
SOLID BIOSCIENCES INC.
SALE
President and CEO
28,612——28,613Dec 2, 2025Dec 4, 2025 ↗View →
SLDB
SOLID BIOSCIENCES INC.
PURCHASE
President and CEO
28,612——92,196Dec 2, 2025Dec 4, 2025 ↗View →
SLDB
SOLID BIOSCIENCES INC.
PURCHASEGRANT
Stock grant
337,500——337,500Aug 14, 2025Aug 18, 2025 ↗View →
SLDB
SOLID BIOSCIENCES INC.
PURCHASEGRANT
Stock grant
168,750——168,750Aug 14, 2025Aug 18, 2025 ↗View →
VOR
VOR BIOPHARMA INC.
PURCHASEGRANT
Stock grant
60,000——60,000Jul 16, 2025Jul 18, 2025 ↗View →
CLYM
CLIMB BIO, INC.
PURCHASEGRANT
Stock grant
40,000——40,000Jun 4, 2025Jun 5, 2025 ↗View →
CLYM
CLIMB BIO, INC.
PURCHASEGRANT
Stock grant
80,000——80,000Mar 28, 2025Apr 1, 2025 ↗View →
SLDB
SOLID BIOSCIENCES INC.
SALE10b5-1
10b5-1 plan
11,365$3.96$45.0K60,717Feb 14, 2025Feb 18, 2025 ↗View →
SLDB
SOLID BIOSCIENCES INC.
SALE
President and CEO
30,031——90,094Feb 13, 2025Feb 18, 2025 ↗View →
SLDB
SOLID BIOSCIENCES INC.
PURCHASE
President and CEO
30,031——72,082Feb 13, 2025Feb 18, 2025 ↗View →
SLDB
SOLID BIOSCIENCES INC.
PURCHASEGRANT
Stock grant
401,600——401,600Jan 31, 2025Feb 11, 2025 ↗View →
SLDB
SOLID BIOSCIENCES INC.
SALE
President and CEO
11,114$5.60$62.2K38,484Dec 3, 2024Dec 4, 2024 ↗View →
SLDB
SOLID BIOSCIENCES INC.
PURCHASE
President and CEO
28,612——49,598Dec 2, 2024Dec 4, 2024 ↗View →
SLDB
SOLID BIOSCIENCES INC.
SALE
President and CEO
28,612——57,225Dec 2, 2024Dec 4, 2024 ↗View →
SLDB
SOLID BIOSCIENCES INC.
PURCHASEGRANT
Stock grant
120,125——120,125Feb 13, 2024Feb 16, 2024 ↗View →
SLDB
SOLID BIOSCIENCES INC.
PURCHASEGRANT
Stock grant
240,250——240,250Feb 13, 2024Feb 16, 2024 ↗View →
SLDB
SOLID BIOSCIENCES INC.
SALE
President and CEO
11,757$2.77$32.5K17,439Dec 4, 2023Dec 5, 2023 ↗View →
SLDB
SOLID BIOSCIENCES INC.
SALE
President and CEO
28,612——85,837Dec 2, 2023Dec 5, 2023 ↗View →
SLDB
SOLID BIOSCIENCES INC.
PURCHASE
President and CEO
28,612——29,196Dec 2, 2023Dec 5, 2023 ↗View →
SLDB
SOLID BIOSCIENCES INC.
PURCHASEGRANT
Stock grant
228,900——228,900Dec 2, 2022Dec 5, 2022 ↗View →
SLDB
SOLID BIOSCIENCES INC.
PURCHASEGRANT
Stock grant
114,449——114,449Dec 2, 2022Dec 5, 2022 ↗View →
SLDB
SOLID BIOSCIENCES INC.
PURCHASEGRANT
Stock grant
584——584Dec 2, 2022Dec 5, 2022 ↗View →
SRPT
SAREPTA THERAPEUTICS, INC.
PURCHASEGRANT
Stock grant
6,700——8,567Feb 28, 2020Feb 28, 2020 ↗View →
SRPT
SAREPTA THERAPEUTICS, INC.
PURCHASEGRANT
Stock grant
37,500——37,500Feb 28, 2020Feb 28, 2020 ↗View →
Other insiders · SLDB
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About this filer
CIK 0001685994
ROLE
President and CEO
PRIMARY
SLDB
COMPANIES
4
ACTIVE SINCE
Feb 2020
MARKETPEEL · /INSIDER/0001685994DATA · SEC EDGAR · FORM 4 · CONSOLIDATED TAPE
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