Listed

Spero Therapeutics, Inc.

SPRONasdaqCIK 1701108HealthcareFiscal year ends Dec 31

Standardized line items from XBRL company facts, the last twelve quarters. Negative values are in parentheses. A figure marked d is derived from year-to-date figures.

Income statement

Revenue$0, Q2 FY2026
Operating income−$9.9m, Q2 FY2026
Net income−$9.6m, Q2 FY2026
Spero Therapeutics, Inc., income statement, quarterly
Line itemUnitQ3 FY20232023-09-30Q4 FY20232023-12-31Q1 FY20242024-03-31Q2 FY20242024-06-30Q3 FY20242024-09-30Q4 FY20242024-12-31Q1 FY20252025-03-31Q2 FY20252025-06-30Q3 FY20252025-09-30Q4 FY20252025-12-31Q1 FY20262026-03-31Q2 FY20262026-06-30
Revenue$m0.2Revenue, Q3 FY2023, three months to 2023-09-30$218.0k. XBRL concept us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax. 10-Q filed 2024-11-14, accession 0000950170-24-127016.Report this figure0.2Revenue, Q4 FY2023, three months to 2023-12-31$223.0k. XBRL concept us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax. 10-K filed 2025-03-27, accession 0000950170-25-046125. Derived: 12-month figure less the 9-month figure.Report this figure0.1Revenue, Q1 FY2024, three months to 2024-03-31$140.0k. XBRL concept us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax. 10-Q filed 2025-05-13, accession 0000950170-25-070380.Report this figure0.1Revenue, Q2 FY2024, three months to 2024-06-30$114.0k. XBRL concept us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax. 10-Q filed 2025-08-12, accession 0000950170-25-107388.Report this figure0.1Revenue, Q3 FY2024, three months to 2024-09-30$65.0k. XBRL concept us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax. 10-Q filed 2025-11-13, accession 0001193125-25-280174.Report this figure0.1Revenue, Q4 FY2024, three months to 2024-12-31$52.0k. XBRL concept us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax. 10-K filed 2026-03-26, accession 0001193125-26-126192. Derived: 12-month figure less the 9-month figure.Report this figure0.0Revenue, Q1 FY2025, three months to 2025-03-31$12.0k. XBRL concept us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax. 10-Q filed 2026-05-13, accession 0001193125-26-221591.Report this figure0.0Revenue, Q2 FY2025, three months to 2025-06-30$0. XBRL concept us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax. 10-Q filed 2026-08-12, accession 0001193125-26-346795.Report this figure0.0Revenue, Q3 FY2025, three months to 2025-09-30$0. XBRL concept us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax. 10-Q filed 2025-11-13, accession 0001193125-25-280174.Report this figure12.6Revenue, Q4 FY2025, three months to 2025-12-31$12.6m. XBRL concept us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax. 10-K filed 2026-03-26, accession 0001193125-26-126192. Derived: 12-month figure less the 9-month figure.Report this figure0.0Revenue, Q1 FY2026, three months to 2026-03-31$0. XBRL concept us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax. 10-Q filed 2026-05-13, accession 0001193125-26-221591.Report this figure0.0Revenue, Q2 FY2026, three months to 2026-06-30$0. XBRL concept us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax. 10-Q filed 2026-08-12, accession 0001193125-26-346795.Report this figure
Research and development$m16.4Research and development, Q3 FY2023, three months to 2023-09-30$16.4m. XBRL concept us-gaap:ResearchAndDevelopmentExpense. 10-Q filed 2024-11-14, accession 0000950170-24-127016.Report this figure16.6Research and development, Q4 FY2023, three months to 2023-12-31$16.6m. XBRL concept us-gaap:ResearchAndDevelopmentExpense. 10-K filed 2025-03-27, accession 0000950170-25-046125. Derived: 12-month figure less the 9-month figure.Report this figure17.3Research and development, Q1 FY2024, three months to 2024-03-31$17.3m. XBRL concept us-gaap:ResearchAndDevelopmentExpense. 10-Q filed 2025-05-13, accession 0000950170-25-070380.Report this figure23.7Research and development, Q2 FY2024, three months to 2024-06-30$23.7m. XBRL concept us-gaap:ResearchAndDevelopmentExpense. 10-Q filed 2025-08-12, accession 0000950170-25-107388.Report this figure26.9Research and development, Q3 FY2024, three months to 2024-09-30$26.9m. XBRL concept us-gaap:ResearchAndDevelopmentExpense. 10-Q filed 2025-11-13, accession 0001193125-25-280174.Report this figure28.8Research and development, Q4 FY2024, three months to 2024-12-31$28.8m. XBRL concept us-gaap:ResearchAndDevelopmentExpense. 10-K filed 2026-03-26, accession 0001193125-26-126192. Derived: 12-month figure less the 9-month figure.Report this figure13.6Research and development, Q1 FY2025, three months to 2025-03-31$13.6m. XBRL concept us-gaap:ResearchAndDevelopmentExpense. 10-Q filed 2026-05-13, accession 0001193125-26-221591.Report this figure10.7Research and development, Q2 FY2025, three months to 2025-06-30$10.7m. XBRL concept us-gaap:ResearchAndDevelopmentExpense. 10-Q filed 2026-08-12, accession 0001193125-26-346795.Report this figure8.6Research and development, Q3 FY2025, three months to 2025-09-30$8.6m. XBRL concept us-gaap:ResearchAndDevelopmentExpense. 10-Q filed 2025-11-13, accession 0001193125-25-280174.Report this figure5.6Research and development, Q4 FY2025, three months to 2025-12-31$5.6m. XBRL concept us-gaap:ResearchAndDevelopmentExpense. 10-K filed 2026-03-26, accession 0001193125-26-126192. Derived: 12-month figure less the 9-month figure.Report this figure2.9Research and development, Q1 FY2026, three months to 2026-03-31$2.9m. XBRL concept us-gaap:ResearchAndDevelopmentExpense. 10-Q filed 2026-05-13, accession 0001193125-26-221591.Report this figure3.4Research and development, Q2 FY2026, three months to 2026-06-30$3.4m. XBRL concept us-gaap:ResearchAndDevelopmentExpense. 10-Q filed 2026-08-12, accession 0001193125-26-346795.Report this figure
Operating income$m(1.9)Operating income, Q3 FY2023, three months to 2023-09-30−$1.9m. XBRL concept us-gaap:OperatingIncomeLoss. 10-Q filed 2024-11-14, accession 0000950170-24-127016.Report this figure50.5Operating income, Q4 FY2023, three months to 2023-12-31$50.5m. XBRL concept us-gaap:OperatingIncomeLoss. 10-K filed 2025-03-27, accession 0000950170-25-046125. Derived: 12-month figure less the 9-month figure.Report this figure(14.0)Operating income, Q1 FY2024, three months to 2024-03-31−$14.0m. XBRL concept us-gaap:OperatingIncomeLoss. 10-Q filed 2025-05-13, accession 0000950170-25-070380.Report this figure(19.1)Operating income, Q2 FY2024, three months to 2024-06-30−$19.1m. XBRL concept us-gaap:OperatingIncomeLoss. 10-Q filed 2025-08-12, accession 0000950170-25-107388.Report this figure(18.6)Operating income, Q3 FY2024, three months to 2024-09-30−$18.6m. XBRL concept us-gaap:OperatingIncomeLoss. 10-Q filed 2025-11-13, accession 0001193125-25-280174.Report this figure(21.7)Operating income, Q4 FY2024, three months to 2024-12-31−$21.7m. XBRL concept us-gaap:OperatingIncomeLoss. 10-K filed 2026-03-26, accession 0001193125-26-126192. Derived: 12-month figure less the 9-month figure.Report this figure(14.7)Operating income, Q1 FY2025, three months to 2025-03-31−$14.7m. XBRL concept us-gaap:OperatingIncomeLoss. 10-Q filed 2026-05-13, accession 0001193125-26-221591.Report this figure(2.4)Operating income, Q2 FY2025, three months to 2025-06-30−$2.4m. XBRL concept us-gaap:OperatingIncomeLoss. 10-Q filed 2026-08-12, accession 0001193125-26-346795.Report this figure(7.9)Operating income, Q3 FY2025, three months to 2025-09-30−$7.9m. XBRL concept us-gaap:OperatingIncomeLoss. 10-Q filed 2025-11-13, accession 0001193125-25-280174.Report this figure31.4Operating income, Q4 FY2025, three months to 2025-12-31$31.4m. XBRL concept us-gaap:OperatingIncomeLoss. 10-K filed 2026-03-26, accession 0001193125-26-126192. Derived: 12-month figure less the 9-month figure.Report this figure(7.5)Operating income, Q1 FY2026, three months to 2026-03-31−$7.5m. XBRL concept us-gaap:OperatingIncomeLoss. 10-Q filed 2026-05-13, accession 0001193125-26-221591.Report this figure(9.9)Operating income, Q2 FY2026, three months to 2026-06-30−$9.9m. XBRL concept us-gaap:OperatingIncomeLoss. 10-Q filed 2026-08-12, accession 0001193125-26-346795.Report this figure
Income tax$m2.2Income tax, Q3 FY2023, three months to 2023-09-30$2.2m. XBRL concept us-gaap:IncomeTaxExpenseBenefit. 10-Q filed 2024-11-14, accession 0000950170-24-127016.Report this figure0.4Income tax, Q4 FY2023, three months to 2023-12-31$387.0k. XBRL concept us-gaap:IncomeTaxExpenseBenefit. 10-K filed 2025-03-27, accession 0000950170-25-046125. Derived: 12-month figure less the 9-month figure.Report this figurenot reportednot reported0.3Income tax, Q3 FY2024, three months to 2024-09-30$290.0k. XBRL concept us-gaap:IncomeTaxExpenseBenefit. 10-Q filed 2025-11-13, accession 0001193125-25-280174.Report this figure(0.3)Income tax, Q4 FY2024, three months to 2024-12-31−$290.0k. XBRL concept us-gaap:IncomeTaxExpenseBenefit. 10-K filed 2026-03-26, accession 0001193125-26-126192. Derived: 12-month figure less the 9-month figure.Report this figurenot reportednot reported0.0Income tax, Q3 FY2025, three months to 2025-09-30$0. XBRL concept us-gaap:IncomeTaxExpenseBenefit. 10-Q filed 2025-11-13, accession 0001193125-25-280174.Report this figure0.3Income tax, Q4 FY2025, three months to 2025-12-31$261.0k. XBRL concept us-gaap:IncomeTaxExpenseBenefit. 10-K filed 2026-03-26, accession 0001193125-26-126192. Derived: 12-month figure less the 9-month figure.Report this figurenot reportednot reported
Net income$m(3.2)Net income, Q3 FY2023, three months to 2023-09-30−$3.2m. XBRL concept us-gaap:NetIncomeLoss. 10-Q filed 2023-11-13, accession 0000950170-23-062897.Report this figure51.2Net income, Q4 FY2023, three months to 2023-12-31$51.2m. XBRL concept us-gaap:NetIncomeLoss. 10-K filed 2025-03-27, accession 0000950170-25-046125. Derived: 12-month figure less the 9-month figure.Report this figure(12.7)Net income, Q1 FY2024, three months to 2024-03-31−$12.7m. XBRL concept us-gaap:NetIncomeLoss. 10-Q filed 2025-05-13, accession 0000950170-25-070380.Report this figure(17.9)Net income, Q2 FY2024, three months to 2024-06-30−$17.9m. XBRL concept us-gaap:NetIncomeLoss. 10-Q filed 2025-08-12, accession 0000950170-25-107388.Report this figure(17.1)Net income, Q3 FY2024, three months to 2024-09-30−$17.1m. XBRL concept us-gaap:NetIncomeLoss. 10-Q filed 2025-11-13, accession 0001193125-25-280174.Report this figure(20.9)Net income, Q4 FY2024, three months to 2024-12-31−$20.9m. XBRL concept us-gaap:NetIncomeLoss. 10-K filed 2026-03-26, accession 0001193125-26-126192. Derived: 12-month figure less the 9-month figure.Report this figure(13.9)Net income, Q1 FY2025, three months to 2025-03-31−$13.9m. XBRL concept us-gaap:NetIncomeLoss. 10-Q filed 2026-05-13, accession 0001193125-26-221591.Report this figure(1.7)Net income, Q2 FY2025, three months to 2025-06-30−$1.7m. XBRL concept us-gaap:NetIncomeLoss. 10-Q filed 2026-08-12, accession 0001193125-26-346795.Report this figure(7.4)Net income, Q3 FY2025, three months to 2025-09-30−$7.4m. XBRL concept us-gaap:NetIncomeLoss. 10-Q filed 2025-11-13, accession 0001193125-25-280174.Report this figure31.5Net income, Q4 FY2025, three months to 2025-12-31$31.5m. XBRL concept us-gaap:NetIncomeLoss. 10-K filed 2026-03-26, accession 0001193125-26-126192. Derived: 12-month figure less the 9-month figure.Report this figure(7.2)Net income, Q1 FY2026, three months to 2026-03-31−$7.2m. XBRL concept us-gaap:NetIncomeLoss. 10-Q filed 2026-05-13, accession 0001193125-26-221591.Report this figure(9.6)Net income, Q2 FY2026, three months to 2026-06-30−$9.6m. XBRL concept us-gaap:NetIncomeLoss. 10-Q filed 2026-08-12, accession 0001193125-26-346795.Report this figure
Diluted EPS$ per share(0.06)Diluted EPS, Q3 FY2023, three months to 2023-09-30−$0.06 per share. XBRL concept us-gaap:EarningsPerShareDiluted. 10-Q filed 2024-11-14, accession 0000950170-24-127016.Report this figurenot reported(0.24)Diluted EPS, Q1 FY2024, three months to 2024-03-31−$0.24 per share. XBRL concept us-gaap:EarningsPerShareDiluted. 10-Q filed 2025-05-13, accession 0000950170-25-070380.Report this figure(0.33)Diluted EPS, Q2 FY2024, three months to 2024-06-30−$0.33 per share. XBRL concept us-gaap:EarningsPerShareDiluted. 10-Q filed 2025-08-12, accession 0000950170-25-107388.Report this figure(0.32)Diluted EPS, Q3 FY2024, three months to 2024-09-30−$0.32 per share. XBRL concept us-gaap:EarningsPerShareDiluted. 10-Q filed 2025-11-13, accession 0001193125-25-280174.Report this figurenot reported(0.25)Diluted EPS, Q1 FY2025, three months to 2025-03-31−$0.25 per share. XBRL concept us-gaap:EarningsPerShareDiluted. 10-Q filed 2026-05-13, accession 0001193125-26-221591.Report this figure(0.03)Diluted EPS, Q2 FY2025, three months to 2025-06-30−$0.03 per share. XBRL concept us-gaap:EarningsPerShareDiluted. 10-Q filed 2026-08-12, accession 0001193125-26-346795.Report this figure(0.13)Diluted EPS, Q3 FY2025, three months to 2025-09-30−$0.13 per share. XBRL concept us-gaap:EarningsPerShareDiluted. 10-Q filed 2025-11-13, accession 0001193125-25-280174.Report this figurenot reported(0.13)Diluted EPS, Q1 FY2026, three months to 2026-03-31−$0.13 per share. XBRL concept us-gaap:EarningsPerShareDiluted. 10-Q filed 2026-05-13, accession 0001193125-26-221591.Report this figure(0.16)Diluted EPS, Q2 FY2026, three months to 2026-06-30−$0.16 per share. XBRL concept us-gaap:EarningsPerShareDiluted. 10-Q filed 2026-08-12, accession 0001193125-26-346795.Report this figure
Basic EPS$ per share(0.06)Basic EPS, Q3 FY2023, three months to 2023-09-30−$0.06 per share. XBRL concept us-gaap:EarningsPerShareBasic. 10-Q filed 2024-11-14, accession 0000950170-24-127016.Report this figurenot reported(0.24)Basic EPS, Q1 FY2024, three months to 2024-03-31−$0.24 per share. XBRL concept us-gaap:EarningsPerShareBasic. 10-Q filed 2025-05-13, accession 0000950170-25-070380.Report this figure(0.33)Basic EPS, Q2 FY2024, three months to 2024-06-30−$0.33 per share. XBRL concept us-gaap:EarningsPerShareBasic. 10-Q filed 2025-08-12, accession 0000950170-25-107388.Report this figure(0.32)Basic EPS, Q3 FY2024, three months to 2024-09-30−$0.32 per share. XBRL concept us-gaap:EarningsPerShareBasic. 10-Q filed 2025-11-13, accession 0001193125-25-280174.Report this figurenot reported(0.25)Basic EPS, Q1 FY2025, three months to 2025-03-31−$0.25 per share. XBRL concept us-gaap:EarningsPerShareBasic. 10-Q filed 2026-05-13, accession 0001193125-26-221591.Report this figure(0.03)Basic EPS, Q2 FY2025, three months to 2025-06-30−$0.03 per share. XBRL concept us-gaap:EarningsPerShareBasic. 10-Q filed 2026-08-12, accession 0001193125-26-346795.Report this figure(0.13)Basic EPS, Q3 FY2025, three months to 2025-09-30−$0.13 per share. XBRL concept us-gaap:EarningsPerShareBasic. 10-Q filed 2025-11-13, accession 0001193125-25-280174.Report this figurenot reported(0.13)Basic EPS, Q1 FY2026, three months to 2026-03-31−$0.13 per share. XBRL concept us-gaap:EarningsPerShareBasic. 10-Q filed 2026-05-13, accession 0001193125-26-221591.Report this figure(0.16)Basic EPS, Q2 FY2026, three months to 2026-06-30−$0.16 per share. XBRL concept us-gaap:EarningsPerShareBasic. 10-Q filed 2026-08-12, accession 0001193125-26-346795.Report this figure

Balance sheet

Cash and equivalents$50.8m, Q2 FY2026
Shareholders' equity$44.2m, Q2 FY2026
Spero Therapeutics, Inc., balance sheet, quarterly
Line itemUnitQ3 FY20232023-09-30FY20232023-12-31Q1 FY20242024-03-31Q2 FY20242024-06-30Q3 FY20242024-09-30FY20242024-12-31Q1 FY20252025-03-31Q2 FY20252025-06-30Q3 FY20252025-09-30FY20252025-12-31Q1 FY20262026-03-31Q2 FY20262026-06-30
Cash and equivalents$m93.8Cash and equivalents, Q3 FY2023, at 2023-09-30$93.8m. XBRL concept us-gaap:CashAndCashEquivalentsAtCarryingValue. 10-Q filed 2023-11-13, accession 0000950170-23-062897.Report this figure76.3Cash and equivalents, FY2023, at 2023-12-31$76.3m. XBRL concept us-gaap:CashAndCashEquivalentsAtCarryingValue. 10-K filed 2025-03-27, accession 0000950170-25-046125.Report this figure82.3Cash and equivalents, Q1 FY2024, at 2024-03-31$82.3m. XBRL concept us-gaap:CashAndCashEquivalentsAtCarryingValue. 10-Q filed 2024-05-15, accession 0000950170-24-060400.Report this figure63.5Cash and equivalents, Q2 FY2024, at 2024-06-30$63.5m. XBRL concept us-gaap:CashAndCashEquivalentsAtCarryingValue. 10-Q filed 2024-08-05, accession 0000950170-24-090782.Report this figure76.3Cash and equivalents, Q3 FY2024, at 2024-09-30$76.3m. XBRL concept us-gaap:CashAndCashEquivalentsAtCarryingValue. 10-Q filed 2024-11-14, accession 0000950170-24-127016.Report this figure52.9Cash and equivalents, FY2024, at 2024-12-31$52.9m. XBRL concept us-gaap:CashAndCashEquivalentsAtCarryingValue. 10-K filed 2026-03-26, accession 0001193125-26-126192.Report this figure48.9Cash and equivalents, Q1 FY2025, at 2025-03-31$48.9m. XBRL concept us-gaap:CashAndCashEquivalentsAtCarryingValue. 10-Q filed 2025-05-13, accession 0000950170-25-070380.Report this figure31.2Cash and equivalents, Q2 FY2025, at 2025-06-30$31.2m. XBRL concept us-gaap:CashAndCashEquivalentsAtCarryingValue. 10-Q filed 2025-08-12, accession 0000950170-25-107388.Report this figure48.6Cash and equivalents, Q3 FY2025, at 2025-09-30$48.6m. XBRL concept us-gaap:CashAndCashEquivalentsAtCarryingValue. 10-Q filed 2025-11-13, accession 0001193125-25-280174.Report this figure40.3Cash and equivalents, FY2025, at 2025-12-31$40.3m. XBRL concept us-gaap:CashAndCashEquivalentsAtCarryingValue. 10-Q filed 2026-08-12, accession 0001193125-26-346795.Report this figure56.1Cash and equivalents, Q1 FY2026, at 2026-03-31$56.1m. XBRL concept us-gaap:CashAndCashEquivalentsAtCarryingValue. 10-Q filed 2026-05-13, accession 0001193125-26-221591.Report this figure50.8Cash and equivalents, Q2 FY2026, at 2026-06-30$50.8m. XBRL concept us-gaap:CashAndCashEquivalentsAtCarryingValue. 10-Q filed 2026-08-12, accession 0001193125-26-346795.Report this figure
Current assets$m102Current assets, Q3 FY2023, at 2023-09-30$102.2m. XBRL concept us-gaap:AssetsCurrent. 10-Q filed 2023-11-13, accession 0000950170-23-062897.Report this figure131Current assets, FY2023, at 2023-12-31$131.2m. XBRL concept us-gaap:AssetsCurrent. 10-K filed 2025-03-27, accession 0000950170-25-046125.Report this figure140Current assets, Q1 FY2024, at 2024-03-31$140.2m. XBRL concept us-gaap:AssetsCurrent. 10-Q filed 2024-05-15, accession 0000950170-24-060400.Report this figure122Current assets, Q2 FY2024, at 2024-06-30$122.2m. XBRL concept us-gaap:AssetsCurrent. 10-Q filed 2024-08-05, accession 0000950170-24-090782.Report this figure132Current assets, Q3 FY2024, at 2024-09-30$131.6m. XBRL concept us-gaap:AssetsCurrent. 10-Q filed 2024-11-14, accession 0000950170-24-127016.Report this figure107Current assets, FY2024, at 2024-12-31$107.3m. XBRL concept us-gaap:AssetsCurrent. 10-K filed 2026-03-26, accession 0001193125-26-126192.Report this figure74.7Current assets, Q1 FY2025, at 2025-03-31$74.7m. XBRL concept us-gaap:AssetsCurrent. 10-Q filed 2025-05-13, accession 0000950170-25-070380.Report this figure59.4Current assets, Q2 FY2025, at 2025-06-30$59.4m. XBRL concept us-gaap:AssetsCurrent. 10-Q filed 2025-08-12, accession 0000950170-25-107388.Report this figure52.3Current assets, Q3 FY2025, at 2025-09-30$52.3m. XBRL concept us-gaap:AssetsCurrent. 10-Q filed 2025-11-13, accession 0001193125-25-280174.Report this figure67.3Current assets, FY2025, at 2025-12-31$67.3m. XBRL concept us-gaap:AssetsCurrent. 10-Q filed 2026-08-12, accession 0001193125-26-346795.Report this figure57.6Current assets, Q1 FY2026, at 2026-03-31$57.6m. XBRL concept us-gaap:AssetsCurrent. 10-Q filed 2026-05-13, accession 0001193125-26-221591.Report this figure51.6Current assets, Q2 FY2026, at 2026-06-30$51.6m. XBRL concept us-gaap:AssetsCurrent. 10-Q filed 2026-08-12, accession 0001193125-26-346795.Report this figure
Total assets$m107Total assets, Q3 FY2023, at 2023-09-30$107.1m. XBRL concept us-gaap:Assets. 10-Q filed 2023-11-13, accession 0000950170-23-062897.Report this figure182Total assets, FY2023, at 2023-12-31$182.4m. XBRL concept us-gaap:Assets. 10-K filed 2025-03-27, accession 0000950170-25-046125.Report this figure168Total assets, Q1 FY2024, at 2024-03-31$167.7m. XBRL concept us-gaap:Assets. 10-Q filed 2024-05-15, accession 0000950170-24-060400.Report this figure150Total assets, Q2 FY2024, at 2024-06-30$149.9m. XBRL concept us-gaap:Assets. 10-Q filed 2024-08-05, accession 0000950170-24-090782.Report this figure135Total assets, Q3 FY2024, at 2024-09-30$135.2m. XBRL concept us-gaap:Assets. 10-Q filed 2024-11-14, accession 0000950170-24-127016.Report this figure111Total assets, FY2024, at 2024-12-31$110.5m. XBRL concept us-gaap:Assets. 10-K filed 2026-03-26, accession 0001193125-26-126192.Report this figure77.7Total assets, Q1 FY2025, at 2025-03-31$77.7m. XBRL concept us-gaap:Assets. 10-Q filed 2025-05-13, accession 0000950170-25-070380.Report this figure62.1Total assets, Q2 FY2025, at 2025-06-30$62.1m. XBRL concept us-gaap:Assets. 10-Q filed 2025-08-12, accession 0000950170-25-107388.Report this figure54.2Total assets, Q3 FY2025, at 2025-09-30$54.2m. XBRL concept us-gaap:Assets. 10-Q filed 2025-11-13, accession 0001193125-25-280174.Report this figure68.9Total assets, FY2025, at 2025-12-31$68.9m. XBRL concept us-gaap:Assets. 10-Q filed 2026-08-12, accession 0001193125-26-346795.Report this figure59.0Total assets, Q1 FY2026, at 2026-03-31$59.0m. XBRL concept us-gaap:Assets. 10-Q filed 2026-05-13, accession 0001193125-26-221591.Report this figure52.8Total assets, Q2 FY2026, at 2026-06-30$52.8m. XBRL concept us-gaap:Assets. 10-Q filed 2026-08-12, accession 0001193125-26-346795.Report this figure
Current liabilities$m25.5Current liabilities, Q3 FY2023, at 2023-09-30$25.5m. XBRL concept us-gaap:LiabilitiesCurrent. 10-Q filed 2023-11-13, accession 0000950170-23-062897.Report this figure37.2Current liabilities, FY2023, at 2023-12-31$37.2m. XBRL concept us-gaap:LiabilitiesCurrent. 10-K filed 2025-03-27, accession 0000950170-25-046125.Report this figure41.8Current liabilities, Q1 FY2024, at 2024-03-31$41.8m. XBRL concept us-gaap:LiabilitiesCurrent. 10-Q filed 2024-05-15, accession 0000950170-24-060400.Report this figure45.6Current liabilities, Q2 FY2024, at 2024-06-30$45.6m. XBRL concept us-gaap:LiabilitiesCurrent. 10-Q filed 2024-08-05, accession 0000950170-24-090782.Report this figure49.1Current liabilities, Q3 FY2024, at 2024-09-30$49.1m. XBRL concept us-gaap:LiabilitiesCurrent. 10-Q filed 2024-11-14, accession 0000950170-24-127016.Report this figure49.1Current liabilities, FY2024, at 2024-12-31$49.1m. XBRL concept us-gaap:LiabilitiesCurrent. 10-K filed 2026-03-26, accession 0001193125-26-126192.Report this figure29.2Current liabilities, Q1 FY2025, at 2025-03-31$29.2m. XBRL concept us-gaap:LiabilitiesCurrent. 10-Q filed 2025-05-13, accession 0000950170-25-070380.Report this figure14.9Current liabilities, Q2 FY2025, at 2025-06-30$14.9m. XBRL concept us-gaap:LiabilitiesCurrent. 10-Q filed 2025-08-12, accession 0000950170-25-107388.Report this figure13.6Current liabilities, Q3 FY2025, at 2025-09-30$13.6m. XBRL concept us-gaap:LiabilitiesCurrent. 10-Q filed 2025-11-13, accession 0001193125-25-280174.Report this figure8.9Current liabilities, FY2025, at 2025-12-31$8.9m. XBRL concept us-gaap:LiabilitiesCurrent. 10-Q filed 2026-08-12, accession 0001193125-26-346795.Report this figure5.5Current liabilities, Q1 FY2026, at 2026-03-31$5.5m. XBRL concept us-gaap:LiabilitiesCurrent. 10-Q filed 2026-05-13, accession 0001193125-26-221591.Report this figure8.4Current liabilities, Q2 FY2026, at 2026-06-30$8.4m. XBRL concept us-gaap:LiabilitiesCurrent. 10-Q filed 2026-08-12, accession 0001193125-26-346795.Report this figure
Total liabilities$m53.4Total liabilities, Q3 FY2023, at 2023-09-30$53.4m. XBRL concept us-gaap:Liabilities. 10-Q filed 2023-11-13, accession 0000950170-23-062897.Report this figure75.5Total liabilities, FY2023, at 2023-12-31$75.5m. XBRL concept us-gaap:Liabilities. 10-K filed 2025-03-27, accession 0000950170-25-046125.Report this figure71.5Total liabilities, Q1 FY2024, at 2024-03-31$71.5m. XBRL concept us-gaap:Liabilities. 10-Q filed 2024-05-15, accession 0000950170-24-060400.Report this figure69.4Total liabilities, Q2 FY2024, at 2024-06-30$69.4m. XBRL concept us-gaap:Liabilities. 10-Q filed 2024-08-05, accession 0000950170-24-090782.Report this figure69.7Total liabilities, Q3 FY2024, at 2024-09-30$69.7m. XBRL concept us-gaap:Liabilities. 10-Q filed 2024-11-14, accession 0000950170-24-127016.Report this figure64.4Total liabilities, FY2024, at 2024-12-31$64.4m. XBRL concept us-gaap:Liabilities. 10-K filed 2026-03-26, accession 0001193125-26-126192.Report this figure43.9Total liabilities, Q1 FY2025, at 2025-03-31$43.9m. XBRL concept us-gaap:Liabilities. 10-Q filed 2025-05-13, accession 0000950170-25-070380.Report this figure29.3Total liabilities, Q2 FY2025, at 2025-06-30$29.3m. XBRL concept us-gaap:Liabilities. 10-Q filed 2025-08-12, accession 0000950170-25-107388.Report this figure27.7Total liabilities, Q3 FY2025, at 2025-09-30$27.7m. XBRL concept us-gaap:Liabilities. 10-Q filed 2025-11-13, accession 0001193125-25-280174.Report this figure9.9Total liabilities, FY2025, at 2025-12-31$9.9m. XBRL concept us-gaap:Liabilities. 10-Q filed 2026-08-12, accession 0001193125-26-346795.Report this figure6.1Total liabilities, Q1 FY2026, at 2026-03-31$6.1m. XBRL concept us-gaap:Liabilities. 10-Q filed 2026-05-13, accession 0001193125-26-221591.Report this figure8.6Total liabilities, Q2 FY2026, at 2026-06-30$8.6m. XBRL concept us-gaap:Liabilities. 10-Q filed 2026-08-12, accession 0001193125-26-346795.Report this figure
Shareholders' equity$m53.7Shareholders' equity, Q3 FY2023, at 2023-09-30$53.7m. XBRL concept us-gaap:StockholdersEquity. 10-Q filed 2024-11-14, accession 0000950170-24-127016.Report this figure107Shareholders' equity, FY2023, at 2023-12-31$106.9m. XBRL concept us-gaap:StockholdersEquity. 10-K filed 2026-03-26, accession 0001193125-26-126192.Report this figure96.2Shareholders' equity, Q1 FY2024, at 2024-03-31$96.2m. XBRL concept us-gaap:StockholdersEquity. 10-Q filed 2025-08-12, accession 0000950170-25-107388.Report this figure80.5Shareholders' equity, Q2 FY2024, at 2024-06-30$80.5m. XBRL concept us-gaap:StockholdersEquity. 10-Q filed 2025-11-13, accession 0001193125-25-280174.Report this figure65.5Shareholders' equity, Q3 FY2024, at 2024-09-30$65.5m. XBRL concept us-gaap:StockholdersEquity. 10-Q filed 2025-11-13, accession 0001193125-25-280174.Report this figure46.1Shareholders' equity, FY2024, at 2024-12-31$46.1m. XBRL concept us-gaap:StockholdersEquity. 10-Q filed 2026-08-12, accession 0001193125-26-346795.Report this figure33.8Shareholders' equity, Q1 FY2025, at 2025-03-31$33.8m. XBRL concept us-gaap:StockholdersEquity. 10-Q filed 2026-08-12, accession 0001193125-26-346795.Report this figure32.8Shareholders' equity, Q2 FY2025, at 2025-06-30$32.8m. XBRL concept us-gaap:StockholdersEquity. 10-Q filed 2026-08-12, accession 0001193125-26-346795.Report this figure26.5Shareholders' equity, Q3 FY2025, at 2025-09-30$26.5m. XBRL concept us-gaap:StockholdersEquity. 10-Q filed 2025-11-13, accession 0001193125-25-280174.Report this figure59.0Shareholders' equity, FY2025, at 2025-12-31$59.0m. XBRL concept us-gaap:StockholdersEquity. 10-Q filed 2026-08-12, accession 0001193125-26-346795.Report this figure52.9Shareholders' equity, Q1 FY2026, at 2026-03-31$52.9m. XBRL concept us-gaap:StockholdersEquity. 10-Q filed 2026-08-12, accession 0001193125-26-346795.Report this figure44.2Shareholders' equity, Q2 FY2026, at 2026-06-30$44.2m. XBRL concept us-gaap:StockholdersEquity. 10-Q filed 2026-08-12, accession 0001193125-26-346795.Report this figure

Cash flow

Operating cash flow−$5.4m, Q2 FY2026
Spero Therapeutics, Inc., cash flow, quarterly
Line itemUnitQ3 FY20232023-09-30Q4 FY20232023-12-31Q1 FY20242024-03-31Q2 FY20242024-06-30Q3 FY20242024-09-30Q4 FY20242024-12-31Q1 FY20252025-03-31Q2 FY20252025-06-30Q3 FY20252025-09-30Q4 FY20252025-12-31Q1 FY20262026-03-31Q2 FY20262026-06-30
Operating cash flow$m15.9Operating cash flow, Q3 FY2023, three months to 2023-09-30$15.9m. XBRL concept us-gaap:NetCashProvidedByUsedInOperatingActivities. 10-Q filed 2024-11-14, accession 0000950170-24-127016. Derived: 9-month figure less the 6-month figure.Report this figure(17.5)Operating cash flow, Q4 FY2023, three months to 2023-12-31−$17.5m. XBRL concept us-gaap:NetCashProvidedByUsedInOperatingActivities. 10-K filed 2025-03-27, accession 0000950170-25-046125. Derived: 12-month figure less the 9-month figure.Report this figure5.9Operating cash flow, Q1 FY2024, three months to 2024-03-31$5.9m. XBRL concept us-gaap:NetCashProvidedByUsedInOperatingActivities. 10-Q filed 2025-05-13, accession 0000950170-25-070380.Report this figure(18.7)Operating cash flow, Q2 FY2024, three months to 2024-06-30−$18.7m. XBRL concept us-gaap:NetCashProvidedByUsedInOperatingActivities. 10-Q filed 2025-08-12, accession 0000950170-25-107388. Derived: 6-month figure less the 3-month figure.Report this figure12.8Operating cash flow, Q3 FY2024, three months to 2024-09-30$12.8m. XBRL concept us-gaap:NetCashProvidedByUsedInOperatingActivities. 10-Q filed 2025-11-13, accession 0001193125-25-280174. Derived: 9-month figure less the 6-month figure.Report this figure(23.4)Operating cash flow, Q4 FY2024, three months to 2024-12-31−$23.4m. XBRL concept us-gaap:NetCashProvidedByUsedInOperatingActivities. 10-K filed 2026-03-26, accession 0001193125-26-126192. Derived: 12-month figure less the 9-month figure.Report this figure(4.0)Operating cash flow, Q1 FY2025, three months to 2025-03-31−$4.0m. XBRL concept us-gaap:NetCashProvidedByUsedInOperatingActivities. 10-Q filed 2026-05-13, accession 0001193125-26-221591.Report this figure(17.7)Operating cash flow, Q2 FY2025, three months to 2025-06-30−$17.7m. XBRL concept us-gaap:NetCashProvidedByUsedInOperatingActivities. 10-Q filed 2026-08-12, accession 0001193125-26-346795. Derived: 6-month figure less the 3-month figure.Report this figure17.4Operating cash flow, Q3 FY2025, three months to 2025-09-30$17.4m. XBRL concept us-gaap:NetCashProvidedByUsedInOperatingActivities. 10-Q filed 2025-11-13, accession 0001193125-25-280174. Derived: 9-month figure less the 6-month figure.Report this figure(8.4)Operating cash flow, Q4 FY2025, three months to 2025-12-31−$8.4m. XBRL concept us-gaap:NetCashProvidedByUsedInOperatingActivities. 10-K filed 2026-03-26, accession 0001193125-26-126192. Derived: 12-month figure less the 9-month figure.Report this figure15.9Operating cash flow, Q1 FY2026, three months to 2026-03-31$15.9m. XBRL concept us-gaap:NetCashProvidedByUsedInOperatingActivities. 10-Q filed 2026-05-13, accession 0001193125-26-221591.Report this figure(5.4)Operating cash flow, Q2 FY2026, three months to 2026-06-30−$5.4m. XBRL concept us-gaap:NetCashProvidedByUsedInOperatingActivities. 10-Q filed 2026-08-12, accession 0001193125-26-346795. Derived: 6-month figure less the 3-month figure.Report this figure
Capital expenditure$mnot reportednot reportednot reportednot reportednot reportednot reportednot reportednot reportednot reportednot reportednot reportednot reported

Shares

Diluted shares (weighted)57.97m, Q2 FY2026
Spero Therapeutics, Inc., shares, quarterly
Line itemUnitQ3 FY20222022-09-30Q1 FY20232023-03-31Q2 FY20232023-06-30Q3 FY20232023-09-30Q1 FY20242024-03-31Q2 FY20242024-06-30Q3 FY20242024-09-30Q1 FY20252025-03-31Q2 FY20252025-06-30Q3 FY20252025-09-30Q1 FY20262026-03-31Q2 FY20262026-06-30
Diluted shares (weighted)m shares35.9Diluted shares (weighted), Q3 FY2022, three months to 2022-09-3035,882,076 shares. XBRL concept us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding. 10-Q filed 2023-11-13, accession 0000950170-23-062897.Report this figure52.5Diluted shares (weighted), Q1 FY2023, three months to 2023-03-3152,527,018 shares. XBRL concept us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding. 10-Q filed 2024-05-15, accession 0000950170-24-060400.Report this figure52.6Diluted shares (weighted), Q2 FY2023, three months to 2023-06-3052,571,813 shares. XBRL concept us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding. 10-Q filed 2024-08-05, accession 0000950170-24-090782.Report this figure52.7Diluted shares (weighted), Q3 FY2023, three months to 2023-09-3052,710,280 shares. XBRL concept us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding. 10-Q filed 2024-11-14, accession 0000950170-24-127016.Report this figure53.5Diluted shares (weighted), Q1 FY2024, three months to 2024-03-3153,524,037 shares. XBRL concept us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding. 10-Q filed 2025-05-13, accession 0000950170-25-070380.Report this figure54.0Diluted shares (weighted), Q2 FY2024, three months to 2024-06-3053,957,766 shares. XBRL concept us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding. 10-Q filed 2025-08-12, accession 0000950170-25-107388.Report this figure54.1Diluted shares (weighted), Q3 FY2024, three months to 2024-09-3054,124,862 shares. XBRL concept us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding. 10-Q filed 2025-11-13, accession 0001193125-25-280174.Report this figure55.4Diluted shares (weighted), Q1 FY2025, three months to 2025-03-3155,376,188 shares. XBRL concept us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding. 10-Q filed 2026-05-13, accession 0001193125-26-221591.Report this figure56.0Diluted shares (weighted), Q2 FY2025, three months to 2025-06-3056,026,767 shares. XBRL concept us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding. 10-Q filed 2026-08-12, accession 0001193125-26-346795.Report this figure56.3Diluted shares (weighted), Q3 FY2025, three months to 2025-09-3056,280,844 shares. XBRL concept us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding. 10-Q filed 2025-11-13, accession 0001193125-25-280174.Report this figure57.3Diluted shares (weighted), Q1 FY2026, three months to 2026-03-3157,281,570 shares. XBRL concept us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding. 10-Q filed 2026-05-13, accession 0001193125-26-221591.Report this figure58.0Diluted shares (weighted), Q2 FY2026, three months to 2026-06-3057,968,608 shares. XBRL concept us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding. 10-Q filed 2026-08-12, accession 0001193125-26-346795.Report this figure

Shares outstanding: 58.23mShares outstanding, period not labelled, at 2026-08-0758,234,827 shares. XBRL concept dei:EntityCommonStockSharesOutstanding. 10-Q filed 2026-08-12, accession 0001193125-26-346795.Report this figure at Aug 7, 2026, from the cover of the 10-Q filed Aug 12, 2026.

Source: SEC EDGAR, XBRL company facts. Last ingested by Listed: Oct 24, 2026, 15:46 ET. Listed shows no prices and gives no investment advice.