# Spero Therapeutics, Inc.: filings

SPRO · Nasdaq · CIK 1701108 · [Healthcare](/sectors/healthcare.md) · fiscal year ends Dec 31

Pages: [Overview](/companies/spro.md) · [Financials](/companies/spro/financials.md) · [Filings](/companies/spro/filings.md) · [Insiders](/companies/spro/insiders.md)

## Reports and events: 171 filings

Newest first, by EDGAR acceptance time (Eastern). Filter with ?form= one of: `periodic`, `8-K`, `10-K`, `10-Q`, `4`, `proxy`, `13dg`, `all`, or any form this company filed (4 195, 8-K 116, 3 29, 10-Q 27, SC 13G/A 23, S-8 17, 10-K 9, DEF 14A 9, SC 13G 9, CORRESP 6, EFFECT 6, 424B5 5, CT ORDER 5, ARS 4, DEFA14A 4, S-3 4, 8-K/A 3, D 3, PRE 14A 3, UPLOAD 3, 144 2, 424B4 2, DRS 2, DRS/A 2, S-1 2, S-1/A 2, 10-K/A 1, 8-A12B 1, CERTNAS 1, DRSLTR 1, SC 13D 1, SC 13D/A 1, SCHEDULE 13G/A 1).

| Filed | Accepted | Form | What it is | Accession |
| --- | --- | --- | --- | --- |
| 2026-10-27 | 17:16 ET | [8-K](/filings/0001193125-26-434452.md) | 5.02 Departure or appointment of officers or directors | 0001193125-26-434452 |
| 2026-08-28 | 17:25 ET | [8-K](/filings/0001193125-26-374788.md) | 1.01 Entry into a material agreement; 8.01 Other events; 9.01 Financial statements and exhibits | 0001193125-26-374788 |
| 2026-08-12 | 16:09 ET | [8-K](/filings/0001193125-26-346855.md) | 2.02 Results of operations; 9.01 Financial statements and exhibits | 0001193125-26-346855 |
| 2026-08-12 | 16:03 ET | [10-Q](/filings/0001193125-26-346795.md) | Quarterly report, period 2026-06-30 | 0001193125-26-346795 |
| 2026-07-14 | 06:30 ET | [8-K](/filings/0001193125-26-302473.md) | 1.01 Entry into a material agreement; 2.03 New direct financial obligation; 7.01 Regulation FD disclosure; 8.01 Other events; 9.01 Financial statements and exhibits | 0001193125-26-302473 |
| 2026-06-25 | 17:08 ET | [8-K](/filings/0001193125-26-283033.md) | 5.02 Departure or appointment of officers or directors; 5.03 Amendment to articles or bylaws; 5.07 Shareholder vote results; 9.01 Financial statements and exhibits | 0001193125-26-283033 |
| 2026-06-22 | 16:05 ET | [8-K](/filings/0001193125-26-277506.md) | 7.01 Regulation FD disclosure; 8.01 Other events; 9.01 Financial statements and exhibits | 0001193125-26-277506 |
| 2026-05-13 | 16:05 ET | [10-Q](/filings/0001193125-26-221591.md) | Quarterly report, period 2026-03-31 | 0001193125-26-221591 |
| 2026-05-13 | 16:02 ET | [8-K](/filings/0001193125-26-221567.md) | 2.02 Results of operations; 9.01 Financial statements and exhibits | 0001193125-26-221567 |
| 2026-04-27 | 16:30 ET | [DEF 14A](/filings/0001193125-26-182201.md) | Proxy statement, period 2026-06-23 | 0001193125-26-182201 |
| 2026-03-26 | 16:10 ET | [8-K](/filings/0001193125-26-126244.md) | 2.02 Results of operations; 9.01 Financial statements and exhibits | 0001193125-26-126244 |
| 2026-03-26 | 16:05 ET | [10-K](/filings/0001193125-26-126192.md) | Annual report, period 2025-12-31 | 0001193125-26-126192 |
| 2026-01-30 | 17:01 ET | [8-K](/filings/0001193125-26-032004.md) | 5.02 Departure or appointment of officers or directors; 8.01 Other events | 0001193125-26-032004 |
| 2025-12-19 | 08:25 ET | [8-K](/filings/0001193125-25-325821.md) | 8.01 Other events; 9.01 Financial statements and exhibits | 0001193125-25-325821 |
| 2025-11-13 | 17:18 ET | [8-K](/filings/0001193125-25-280518.md) | 2.02 Results of operations; 7.01 Regulation FD disclosure; 9.01 Financial statements and exhibits | 0001193125-25-280518 |
| 2025-11-13 | 16:10 ET | [10-Q](/filings/0001193125-25-280174.md) | Quarterly report, period 2025-09-30 | 0001193125-25-280174 |
| 2025-08-12 | 16:31 ET | [10-Q](/filings/0000950170-25-107388.md) | Quarterly report, period 2025-06-30 | 0000950170-25-107388 |
| 2025-08-12 | 16:17 ET | [8-K](/filings/0001193125-25-178970.md) | 2.02 Results of operations; 7.01 Regulation FD disclosure; 9.01 Financial statements and exhibits | 0001193125-25-178970 |
| 2025-06-18 | 17:12 ET | [8-K](/filings/0001193125-25-142807.md) | 5.02 Departure or appointment of officers or directors; 5.07 Shareholder vote results | 0001193125-25-142807 |
| 2025-05-28 | 07:12 ET | [8-K](/filings/0001193125-25-128680.md) | 7.01 Regulation FD disclosure; 8.01 Other events; 9.01 Financial statements and exhibits | 0001193125-25-128680 |
| 2025-05-13 | 16:49 ET | [8-K](/filings/0001193125-25-118882.md) | 2.02 Results of operations; 9.01 Financial statements and exhibits | 0001193125-25-118882 |
| 2025-05-13 | 16:15 ET | [10-Q](/filings/0000950170-25-070380.md) | Quarterly report, period 2025-03-31 | 0000950170-25-070380 |
| 2025-04-28 | 16:15 ET | [DEF 14A](/filings/0001193125-25-100544.md) | Proxy statement, period 2025-06-12 | 0001193125-25-100544 |
| 2025-04-28 | 16:02 ET | [8-K](/filings/0001193125-25-100433.md) | 5.02 Departure or appointment of officers or directors; 9.01 Financial statements and exhibits | 0001193125-25-100433 |
| 2025-03-27 | 17:19 ET | [8-K](/filings/0001193125-25-065633.md) | 2.02 Results of operations; 9.01 Financial statements and exhibits | 0001193125-25-065633 |
| 2025-03-27 | 16:30 ET | [10-K](/filings/0000950170-25-046125.md) | Annual report, period 2024-12-31 | 0000950170-25-046125 |
| 2025-02-28 | 17:11 ET | [8-K](/filings/0001193125-25-042785.md) | 3.01 Delisting notice | 0001193125-25-042785 |
| 2025-01-10 | 07:00 ET | [8-K](/filings/0001193125-25-004063.md) | 2.02 Results of operations; 5.02 Departure or appointment of officers or directors; 7.01 Regulation FD disclosure; 8.01 Other events; 9.01 Financial statements and exhibits | 0001193125-25-004063 |
| 2024-11-14 | 16:05 ET | [8-K](/filings/0001193125-24-258540.md) | 2.02 Results of operations; 9.01 Financial statements and exhibits | 0001193125-24-258540 |
| 2024-11-14 | 16:02 ET | [10-Q](/filings/0000950170-24-127016.md) | Quarterly report, period 2024-09-30 | 0000950170-24-127016 |
| 2024-10-29 | 17:01 ET | [8-K](/filings/0001193125-24-246627.md) | 2.02 Results of operations; 2.05 Exit or disposal costs; 7.01 Regulation FD disclosure; 8.01 Other events; 9.01 Financial statements and exhibits | 0001193125-24-246627 |
| 2024-09-10 | 06:56 ET | [8-K](/filings/0001193125-24-216310.md) | 7.01 Regulation FD disclosure; 9.01 Financial statements and exhibits | 0001193125-24-216310 |
| 2024-08-05 | 16:18 ET | [10-Q](/filings/0000950170-24-090782.md) | Quarterly report, period 2024-06-30 | 0000950170-24-090782 |
| 2024-08-05 | 16:13 ET | [8-K](/filings/0001193125-24-193913.md) | 2.02 Results of operations; 7.01 Regulation FD disclosure; 9.01 Financial statements and exhibits | 0001193125-24-193913 |
| 2024-06-03 | 16:15 ET | [8-K](/filings/0001193125-24-153034.md) | 5.02 Departure or appointment of officers or directors; 5.07 Shareholder vote results; 9.01 Financial statements and exhibits | 0001193125-24-153034 |
| 2024-05-15 | 16:06 ET | [8-K](/filings/0001193125-24-139364.md) | 2.02 Results of operations; 9.01 Financial statements and exhibits | 0001193125-24-139364 |
| 2024-05-15 | 16:02 ET | [10-Q](/filings/0000950170-24-060400.md) | Quarterly report, period 2024-03-31 | 0000950170-24-060400 |
| 2024-04-16 | 16:11 ET | [DEF 14A](/filings/0001193125-24-097749.md) | Proxy statement, period 2024-05-29 | 0001193125-24-097749 |
| 2024-03-29 | 16:06 ET | [8-K](/filings/0001193125-24-082060.md) | 8.01 Other events | 0001193125-24-082060 |
| 2024-03-13 | 16:10 ET | [10-K](/filings/0000950170-24-030767.md) | Annual report, period 2023-12-31 | 0000950170-24-030767 |
| 2024-03-13 | 16:07 ET | [8-K](/filings/0001193125-24-066825.md) | 2.02 Results of operations; 9.01 Financial statements and exhibits | 0001193125-24-066825 |
| 2024-02-09 | 16:05 ET | [8-K](/filings/0001193125-24-029913.md) | 5.02 Departure or appointment of officers or directors | 0001193125-24-029913 |
| 2024-01-08 | 06:07 ET | [8-K](/filings/0001193125-24-003807.md) | 7.01 Regulation FD disclosure; 9.01 Financial statements and exhibits | 0001193125-24-003807 |
| 2024-01-05 | 08:11 ET | [8-K](/filings/0001193125-24-002894.md) | 2.02 Results of operations; 7.01 Regulation FD disclosure; 8.01 Other events; 9.01 Financial statements and exhibits | 0001193125-24-002894 |
| 2024-01-02 | 08:13 ET | [8-K](/filings/0001193125-24-000249.md) | 7.01 Regulation FD disclosure; 8.01 Other events; 9.01 Financial statements and exhibits | 0001193125-24-000249 |
| 2023-11-13 | 16:13 ET | [8-K](/filings/0001193125-23-276030.md) | 2.02 Results of operations; 9.01 Financial statements and exhibits | 0001193125-23-276030 |
| 2023-11-13 | 16:02 ET | [10-Q](/filings/0000950170-23-062897.md) | Quarterly report, period 2023-09-30 | 0000950170-23-062897 |
| 2023-11-01 | 08:10 ET | [8-K](/filings/0001193125-23-267758.md) | 5.02 Departure or appointment of officers or directors; 8.01 Other events; 9.01 Financial statements and exhibits | 0001193125-23-267758 |
| 2023-10-16 | 16:01 ET | [8-K/A](/filings/0001193125-23-256865.md) | 5.03 Amendment to articles or bylaws; 5.07 Shareholder vote results; 9.01 Financial statements and exhibits | 0001193125-23-256865 |
| 2023-10-10 | 08:28 ET | [8-K](/filings/0001193125-23-253136.md) | 5.02 Departure or appointment of officers or directors; 5.03 Amendment to articles or bylaws; 5.07 Shareholder vote results; 9.01 Financial statements and exhibits | 0001193125-23-253136 |

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Source: SEC EDGAR, the company’s filing index. Last ingested by Listed: Oct 29, 2026, 04:34 ET. No prices; not investment advice.