WallStreetZenWallStreetZen

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 Officer2026-05-0425,240$2.51
$63.35kSell
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
Timothy KeutzerChief Operating Officer2026-02-0218,891$2.20
$41.56kSell
Esther RajaveluChief Executive Officer Chief Financial Officer and Chief Business Officer2026-02-0218,442$2.20
$40.57kSell
Esther RajaveluChief Executive Officer Chief Financial Officer and Chief Business Officer2025-11-0740,270$2.37
$95.44kSell

1 of 1

SPRO insiders have sold more... subscribe to Premium to read more.
Net Insider Buy/Sell (L12M) Ownership

Be the first to know when SPRO insiders and whales buy or sell their stock.

SPRO Shareholders

What type of owners hold Spero Therapeutics Inc stock?

Institutional
Insider
Retail
NameHoldSharesValueType
Aquilo Capital Management LLC19.93%11,606,674$13.12MInsider
Gsk PLC15.78%9,190,606$10.39MInsider
Glaxosmithkline PLC6.50%3,788,012$4.28MInsider
Jean Francois Formela4.14%2,408,128$2.72MInsider
Vikas Goyal3.18%1,854,006$2.10MInsider
Sath Shukla2.98%1,736,883$1.96MInsider
Casper Breum1.87%1,091,774$1.23MInsider
Esther Rajavelu1.69%986,851$1.12MInsider
Kamal Hamed1.35%788,117$890.57kInsider
Timothy Keutzer1.28%742,506$839.03kInsider

1 of 3

SPRO vs Biotech Stocks

TickerInst. %Insider %Net Insider (L12M)Net Insider (L3M)
SPRO0.04%62.43%Net Selling
XBIT0.01%46.67%
ELOX0.00%100.00%Net Buying
GOSS1.04%98.96%
INMB0.02%26.79%Net BuyingNet Buying
View Top Biotech Stocks

Spero Therapeutics Stock Ownership FAQ

Who owns Spero Therapeutics?

Spero Therapeutics (NASDAQ: SPRO) is owned by 0.04% institutional shareholders, 62.43% Spero Therapeutics insiders, and 37.54% retail investors. Aquilo Capital Management LLC is the largest individual Spero Therapeutics shareholder, owning 11.61M shares representing 19.93% of the company. Aquilo Capital Management LLC's Spero Therapeutics shares are currently valued at $13.23M.

If you're new to stock investing, here's how to buy Spero Therapeutics stock.
©2026 WallStreetZen
Company
AboutNewsBlogStock Investing FAQPlansPrivacy PolicyTerms of ServiceCancellation & RefundsPerformanceHelp GuidesContactTwitterYouTubeNewsletter
Stock Tools
Top Performing AnalystsStock ScreenerStock ForecastTrending StocksStrong Buy StocksHighest Earnings StocksBest Dividend Paying StocksStatisticsStock Market SectorsStock Market IndustriesHow to Buy Stocks Online
Stock Ideas
Buy The DipBiggest Stock Gainers TodayBiggest Stock Losers Today52 Week High Stocks52 Week Low StocksMost Active Stocks TodayMost Undervalued StocksBest Penny Stocks to Buy NowBest Stocks Under $5Best Stocks Under $10
WallStreetZen does not provide financial advice and does not issue recommendations or offers to buy stock or sell any security.

Information is provided 'as-is' and solely for informational purposes and is not advice. WallStreetZen does not bear any responsibility for any losses or damage that may occur as a result of reliance on this data.