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NASDAQ: SPRO
Spero Therapeutics Inc Stock Ownership - Who owns Spero Therapeutics?

OverviewForecastEarningsRevenueDividendOwnership

Insider buying vs selling

Have Spero Therapeutics Inc insiders been buying or selling?

Buy
Sell
NameRoleDateSharesPriceValue
Esther RajaveluChief Executive Officer Chief Financial Officer and Chief Business Officer2026-02-0637,101$2.36
$87.56kSell
Esther RajaveluChief Executive Officer Chief Financial Officer and Chief Business Officer2026-02-0650,816$2.36
$119.93kSell
Timothy KeutzerChief Operating Officer2026-02-0618,652$2.36
$44.02kSell
Timothy KeutzerChief Operating Officer2026-02-043,471$2.24
$7.78kSell
Timothy KeutzerChief Operating Officer2026-02-0324,224$2.14
$51.84kSell
Esther RajaveluChief Executive Officer Chief Financial Officer and Chief Business Officer2026-02-0218,442$2.20
$40.57kSell
Timothy KeutzerChief Operating Officer2026-02-0218,891$2.20
$41.56kSell
Esther RajaveluChief Executive Officer Chief Financial Officer and Chief Business Officer2025-11-0740,270$2.37
$95.44kSell
Ankit MahadeviaDirector2025-08-286,572$1.97
$12.95kSell
Timothy KeutzerChief Operating Officer2025-08-281,695$1.97
$3.34kSell

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Net Insider Buy/Sell (L12M) Ownership

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SPRO Shareholders

What type of owners hold Spero Therapeutics Inc stock?

Institutional
Insider
Retail
NameHoldSharesValueType
Aquilo Capital Management LLC20.05%11,606,674$29.13MInsider
Gsk PLC15.88%9,190,606$23.07MInsider
Gsk PLC15.88%9,190,606$23.07MInstitution
Glaxosmithkline PLC6.54%3,788,012$9.51MInsider
Jean Francois Formela4.16%2,408,128$6.04MInsider
Pfizer Inc4.08%2,362,348$5.93MInstitution
Vanguard Group Inc3.60%2,083,462$5.23MInstitution
Vikas Goyal3.20%1,854,006$4.65MInsider
Sath Shukla3.00%1,736,883$4.36MInsider
Renaissance Technologies LLC2.21%1,279,522$3.21MInstitution

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SPRO vs Biotech Stocks

TickerInst. %Insider %Net Insider (L12M)Net Insider (L3M)
SPRO36.48%62.44%Net SellingNet Selling
EDSA24.55%75.45%Net BuyingNet Buying
AGEN7.15%92.85%Net BuyingNet Buying
CNTB14.98%24.31%Net BuyingNet Buying
HURA10.15%29.71%
View Top Biotech Stocks

Spero Therapeutics Stock Ownership FAQ

Who owns Spero Therapeutics?

Spero Therapeutics (NASDAQ: SPRO) is owned by 36.48% institutional shareholders, 62.44% Spero Therapeutics insiders, and 1.08% retail investors. Aquilo Capital Management LLC is the largest individual Spero Therapeutics shareholder, owning 11.61M shares representing 20.05% of the company. Aquilo Capital Management LLC's Spero Therapeutics shares are currently valued at $28.78M.

If you're new to stock investing, here's how to buy Spero Therapeutics stock.
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