Latest 10-Q

What changed in Spero Therapeutics, Inc.'s latest quarterly report, compared with the one before.

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Insider trades

Open-market trades from Form 4. 10b5-1 marks a plan set in advance.Open-market buys and sales by officers, directors and 10% owners, from SEC Form 4. A plan set in advance is marked 10b5-1.

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13F holders

Funds that report this stock, checked against market prices.Fund managers with over $100 million in US-listed stocks file a 13F each quarter, up to 45 days after quarter end. Long positions only.

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Trades by members of Congress

Disclosed in dollar ranges, up to 45 days after the trade.Members of Congress, their spouses and dependent children report trades in dollar ranges, up to 45 days after the trade.

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Lobbying

What Spero Therapeutics, Inc. and its lobbying firms report each quarter.A company that lobbies with its own staff reports its expenses; a lobbying firm it hires reports the income it received. We count both.

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Lobbying and contracts

What Spero Therapeutics, Inc. reported spending on lobbying next to the federal contracts it was awarded, by year.Lobbying: each report counts once. If a report was amended, only the newest version counts. Totals use the company's own report when it files one (it includes payments to hired firms); otherwise the hired firms' reported income. Registrations and reports with no amount are not counted. A firm that hands part of its work to another firm may report the same money as that other firm does; the filings do not allow us to tell. Contracts: each award is counted once, for the company that received it (or its listed parent when only the parent is matched), in the year of its first obligation. The amount is the total obligated to date, so a later increase is counted in the year the award began. Only awards of $1 million or more are collected. Agencies: the offices named on lobbying reports and the awarding agencies of contracts are matched to one department name (the Army, Navy and Air Force count as the Department of Defense; NIH, FDA and CMS as Health and Human Services). An agency is listed under both when the company lobbied it and was awarded a contract by it in the same period. Offices outside this list, and Congress, are not counted as agencies.

Lobbying and federal contracts of Spero Therapeutics, Inc. by year
YearLobbyingReportsTop issuesAgencies lobbiedContractsAwardsAwarding agenciesPAC giftsGifts by the company's PAC to candidates for Congress. They come from donations to the PAC, not from the company's own funds.Lobbied and awarding
2021————$10.5M1HHS——

Agencies both lobbied and awarding contracts

No agency appears on both sides in the last 12 months.

Lobbying and contract awards are reported separately; showing them together does not mean one caused the other.

All companies · Contract awards · Lobbying reports

Institutional ownership over time

How many funds reported holding the stock at the end of each quarter, and how many shares they held between them.

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More filings and data

Each opens the table.

About the company

The basics from the company’s SEC registration.

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$0.9999−$0.00 (−0.01%) Nov 13 close
Oct 13, 2026: $1.15Oct 14, 2026: $1.12Oct 15, 2026: $1.13Oct 16, 2026: $1.10Oct 19, 2026: $1.12Oct 20, 2026: $1.22Oct 21, 2026: $1.17Oct 22, 2026: $1.13Oct 23, 2026: $1.11Oct 26, 2026: $1.07Oct 27, 2026: $1.14Oct 28, 2026: $1.17Oct 29, 2026: $1.11Oct 30, 2026: $1.06Nov 2, 2026: $1.04Nov 3, 2026: $1.04Nov 4, 2026: $1.07Nov 5, 2026: $1.02Nov 6, 2026: $1.03Nov 9, 2026: $1.07Nov 10, 2026: $1.01Nov 11, 2026: $1.02Nov 12, 2026: $1.00Nov 13, 2026: $0.9999
Oct 13, 2026Low $0.9999 · High $1.22Nov 13, 2026
Aug 13, 2026: $1.24Aug 14, 2026: $1.23Aug 17, 2026: $1.19Aug 18, 2026: $1.20Aug 19, 2026: $1.23Aug 20, 2026: $1.21Aug 21, 2026: $1.22Aug 24, 2026: $1.22Aug 25, 2026: $1.23Aug 26, 2026: $1.22Aug 27, 2026: $1.21Aug 28, 2026: $1.20Aug 31, 2026: $1.22Sep 1, 2026: $1.20Sep 2, 2026: $1.22Sep 3, 2026: $1.22Sep 4, 2026: $1.21Sep 8, 2026: $1.19Sep 9, 2026: $1.17Sep 10, 2026: $1.12Sep 11, 2026: $1.13Sep 14, 2026: $1.14Sep 15, 2026: $1.13Sep 16, 2026: $1.11Sep 17, 2026: $1.12Sep 18, 2026: $1.13Sep 21, 2026: $1.14Sep 22, 2026: $1.36Sep 23, 2026: $1.26Sep 24, 2026: $1.25Sep 25, 2026: $1.23Sep 28, 2026: $1.19Sep 29, 2026: $1.20Sep 30, 2026: $1.21Oct 1, 2026: $1.26Oct 2, 2026: $1.19Oct 5, 2026: $1.16Oct 6, 2026: $1.19Oct 7, 2026: $1.17Oct 8, 2026: $1.14Oct 9, 2026: $1.20Oct 12, 2026: $1.18Oct 13, 2026: $1.15Oct 14, 2026: $1.12Oct 15, 2026: $1.13Oct 16, 2026: $1.10Oct 19, 2026: $1.12Oct 20, 2026: $1.22Oct 21, 2026: $1.17Oct 22, 2026: $1.13Oct 23, 2026: $1.11Oct 26, 2026: $1.07Oct 27, 2026: $1.14Oct 28, 2026: $1.17Oct 29, 2026: $1.11Oct 30, 2026: $1.06Nov 2, 2026: $1.04Nov 3, 2026: $1.04Nov 4, 2026: $1.07Nov 5, 2026: $1.02Nov 6, 2026: $1.03Nov 9, 2026: $1.07Nov 10, 2026: $1.01Nov 11, 2026: $1.02Nov 12, 2026: $1.00Nov 13, 2026: $0.9999
Aug 13, 2026Low $0.9999 · High $1.36Nov 13, 2026
Nov 13, 2025: $2.44Nov 14, 2025: $2.41Nov 17, 2025: $2.43Nov 18, 2025: $2.47Nov 19, 2025: $2.38Nov 20, 2025: $2.26Nov 21, 2025: $2.31Nov 24, 2025: $2.38Nov 25, 2025: $2.34Nov 26, 2025: $2.33Nov 28, 2025: $2.40Dec 1, 2025: $2.27Dec 2, 2025: $2.20Dec 3, 2025: $2.28Dec 4, 2025: $2.28Dec 5, 2025: $2.26Dec 8, 2025: $2.31Dec 9, 2025: $2.33Dec 10, 2025: $2.33Dec 11, 2025: $2.35Dec 12, 2025: $2.32Dec 15, 2025: $2.29Dec 16, 2025: $2.27Dec 17, 2025: $2.31Dec 18, 2025: $2.29Dec 19, 2025: $2.32Dec 22, 2025: $2.37Dec 23, 2025: $2.33Dec 24, 2025: $2.34Dec 26, 2025: $2.32Dec 29, 2025: $2.30Dec 30, 2025: $2.27Dec 31, 2025: $2.33Jan 2, 2026: $2.35Jan 5, 2026: $2.43Jan 6, 2026: $2.51Jan 7, 2026: $2.60Jan 8, 2026: $2.57Jan 9, 2026: $2.55Jan 12, 2026: $2.51Jan 13, 2026: $2.45Jan 14, 2026: $2.51Jan 15, 2026: $2.40Jan 16, 2026: $2.41Jan 20, 2026: $2.38Jan 21, 2026: $2.36Jan 22, 2026: $2.45Jan 23, 2026: $2.44Jan 26, 2026: $2.45Jan 27, 2026: $2.37Jan 28, 2026: $2.23Jan 29, 2026: $2.25Jan 30, 2026: $2.19Feb 2, 2026: $2.23Feb 3, 2026: $2.14Feb 4, 2026: $2.29Feb 5, 2026: $2.30Feb 6, 2026: $2.42Feb 9, 2026: $2.36Feb 10, 2026: $2.36Feb 11, 2026: $2.37Feb 12, 2026: $2.38Feb 13, 2026: $2.39Feb 17, 2026: $2.35Feb 18, 2026: $2.33Feb 19, 2026: $2.40Feb 20, 2026: $2.30Feb 23, 2026: $2.24Feb 24, 2026: $2.23Feb 25, 2026: $2.22Feb 26, 2026: $2.21Feb 27, 2026: $2.17Mar 2, 2026: $2.19Mar 3, 2026: $2.19Mar 4, 2026: $2.29Mar 5, 2026: $2.29Mar 6, 2026: $2.30Mar 9, 2026: $2.32Mar 10, 2026: $2.45Mar 11, 2026: $2.59Mar 12, 2026: $2.59Mar 13, 2026: $2.58Mar 16, 2026: $2.59Mar 17, 2026: $2.58Mar 18, 2026: $2.46Mar 19, 2026: $2.47Mar 20, 2026: $2.37Mar 23, 2026: $2.35Mar 24, 2026: $2.37Mar 25, 2026: $2.41Mar 26, 2026: $2.37Mar 27, 2026: $2.33Mar 30, 2026: $2.24Mar 31, 2026: $2.34Apr 1, 2026: $2.45Apr 2, 2026: $2.43Apr 6, 2026: $2.61Apr 7, 2026: $2.67Apr 8, 2026: $2.72Apr 9, 2026: $2.78Apr 10, 2026: $2.67Apr 13, 2026: $2.78Apr 14, 2026: $2.78Apr 15, 2026: $2.64Apr 16, 2026: $2.68Apr 17, 2026: $2.75Apr 20, 2026: $2.84Apr 21, 2026: $2.80Apr 22, 2026: $2.86Apr 23, 2026: $2.80Apr 24, 2026: $2.74Apr 27, 2026: $2.67Apr 28, 2026: $2.67Apr 29, 2026: $2.53Apr 30, 2026: $2.51May 1, 2026: $2.48May 4, 2026: $2.50May 5, 2026: $2.42May 6, 2026: $2.53May 7, 2026: $2.51May 8, 2026: $2.56May 11, 2026: $2.55May 12, 2026: $2.54May 13, 2026: $2.44May 14, 2026: $2.76May 15, 2026: $2.79May 18, 2026: $2.58May 19, 2026: $2.59May 20, 2026: $2.63May 21, 2026: $2.69May 22, 2026: $2.76May 26, 2026: $2.86May 27, 2026: $2.93May 28, 2026: $2.90May 29, 2026: $2.83Jun 1, 2026: $2.83Jun 2, 2026: $2.83Jun 3, 2026: $2.80Jun 4, 2026: $2.98Jun 5, 2026: $2.82Jun 8, 2026: $2.74Jun 9, 2026: $2.57Jun 10, 2026: $2.54Jun 11, 2026: $2.70Jun 12, 2026: $2.85Jun 15, 2026: $2.91Jun 16, 2026: $2.77Jun 17, 2026: $2.11Jun 18, 2026: $2.28Jun 22, 2026: $2.21Jun 23, 2026: $2.15Jun 24, 2026: $2.10Jun 25, 2026: $2.02Jun 26, 2026: $2.26Jun 29, 2026: $2.26Jun 30, 2026: $2.21Jul 1, 2026: $2.22Jul 2, 2026: $2.20Jul 6, 2026: $2.19Jul 7, 2026: $2.16Jul 8, 2026: $2.17Jul 9, 2026: $2.12Jul 10, 2026: $2.10Jul 13, 2026: $2.18Jul 14, 2026: $1.70Jul 15, 2026: $1.70Jul 16, 2026: $1.57Jul 17, 2026: $1.58Jul 20, 2026: $1.44Jul 21, 2026: $1.38Jul 22, 2026: $1.27Jul 23, 2026: $1.16Jul 24, 2026: $1.19Jul 27, 2026: $1.18Jul 28, 2026: $1.20Jul 29, 2026: $1.19Jul 30, 2026: $1.20Jul 31, 2026: $1.17Aug 3, 2026: $1.15Aug 4, 2026: $1.23Aug 5, 2026: $1.26Aug 6, 2026: $1.27Aug 7, 2026: $1.26Aug 10, 2026: $1.23Aug 11, 2026: $1.23Aug 12, 2026: $1.19Aug 13, 2026: $1.24Aug 14, 2026: $1.23Aug 17, 2026: $1.19Aug 18, 2026: $1.20Aug 19, 2026: $1.23Aug 20, 2026: $1.21Aug 21, 2026: $1.22Aug 24, 2026: $1.22Aug 25, 2026: $1.23Aug 26, 2026: $1.22Aug 27, 2026: $1.21Aug 28, 2026: $1.20Aug 31, 2026: $1.22Sep 1, 2026: $1.20Sep 2, 2026: $1.22Sep 3, 2026: $1.22Sep 4, 2026: $1.21Sep 8, 2026: $1.19Sep 9, 2026: $1.17Sep 10, 2026: $1.12Sep 11, 2026: $1.13Sep 14, 2026: $1.14Sep 15, 2026: $1.13Sep 16, 2026: $1.11Sep 17, 2026: $1.12Sep 18, 2026: $1.13Sep 21, 2026: $1.14Sep 22, 2026: $1.36Sep 23, 2026: $1.26Sep 24, 2026: $1.25Sep 25, 2026: $1.23Sep 28, 2026: $1.19Sep 29, 2026: $1.20Sep 30, 2026: $1.21Oct 1, 2026: $1.26Oct 2, 2026: $1.19Oct 5, 2026: $1.16Oct 6, 2026: $1.19Oct 7, 2026: $1.17Oct 8, 2026: $1.14Oct 9, 2026: $1.20Oct 12, 2026: $1.18Oct 13, 2026: $1.15Oct 14, 2026: $1.12Oct 15, 2026: $1.13Oct 16, 2026: $1.10Oct 19, 2026: $1.12Oct 20, 2026: $1.22Oct 21, 2026: $1.17Oct 22, 2026: $1.13Oct 23, 2026: $1.11Oct 26, 2026: $1.07Oct 27, 2026: $1.14Oct 28, 2026: $1.17Oct 29, 2026: $1.11Oct 30, 2026: $1.06Nov 2, 2026: $1.04Nov 3, 2026: $1.04Nov 4, 2026: $1.07Nov 5, 2026: $1.02Nov 6, 2026: $1.03Nov 9, 2026: $1.07Nov 10, 2026: $1.01Nov 11, 2026: $1.02Nov 12, 2026: $1.00Nov 13, 2026: $0.9999
Nov 13, 2025Low $0.9999 · High $2.98Nov 13, 2026
Congress purchase Congress sale Insider sale over $1M

Adjusted for stock splits; not for dividends. Where prices come from.

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