Spero Therapeutics SPRO SEC Filings

NASDAQ SPRO
$1.18 -0.04 (-2.87%)
As of: Oct 21, 2026 · 1:11 PM EDT
EDGAR Disclosures

SEC Filings

Source SEC EDGAR

Every SEC filing Spero Therapeutics, Inc. (SPRO) has made, as reported on EDGAR — annual and quarterly reports, current reports, insider transactions and ownership disclosures. Filter by form group, form type or period, and open any filing or its index directly.

Form Type
# Form Type Form Group Accession Date Filing Index
1EFFECTOthers9999999995-26-002937Sep 10, 2026 12:15 AM
28-KCurrent Report0001193125-26-374788Aug 28, 2026 5:25 PM
3S-3Prospectus0001193125-26-374702Aug 28, 2026 5:04 PM
48-KCurrent Report0001193125-26-346855Aug 12, 2026 4:09 PM
510-QQuarterly & Annual Report0001193125-26-346795Aug 12, 2026 4:03 PM
64Insider Transaction0001807743-26-000007Aug 6, 2026 10:49 PM
73Insider Transaction0001807743-26-000005Aug 6, 2026 10:41 PM
88-KCurrent Report0001193125-26-302473Jul 14, 2026 10:30 AM
94Insider Transaction0001193125-26-283245Jun 25, 2026 11:26 PM
104Insider Transaction0001193125-26-283238Jun 25, 2026 11:17 PM
114Insider Transaction0001193125-26-283230Jun 25, 2026 11:14 PM
124Insider Transaction0001193125-26-283226Jun 25, 2026 11:12 PM
134Insider Transaction0001193125-26-283209Jun 25, 2026 10:59 PM
144Insider Transaction0001193125-26-283202Jun 25, 2026 10:57 PM
154Insider Transaction0001193125-26-283198Jun 25, 2026 10:55 PM
168-KCurrent Report0001193125-26-283033Jun 25, 2026 9:08 PM
17S-8Prospectus0001193125-26-279429Jun 23, 2026 8:05 PM
188-KCurrent Report0001193125-26-277506Jun 22, 2026 8:05 PM
1910-QQuarterly & Annual Report0001193125-26-221591May 13, 2026 4:05 PM
208-KCurrent Report0001193125-26-221567May 13, 2026 4:02 PM
214Insider Transaction0001193125-26-209884May 6, 2026 1:53 AM
224Insider Transaction0001193125-26-209884May 6, 2026 1:53 AM
23ARSOthers0001193125-26-182287Apr 27, 2026 8:43 PM
24DEFA14AOthers0001193125-26-182256Apr 27, 2026 8:39 PM
25DEF 14AOthers0001193125-26-182201Apr 27, 2026 8:30 PM
26PRE 14AOthers0001193125-26-153115Apr 13, 2026 9:26 PM
278-KCurrent Report0001193125-26-126244Mar 26, 2026 8:10 PM
2810-KQuarterly & Annual Report0001193125-26-126192Mar 26, 2026 8:05 PM
294Insider Transaction0001193125-26-043336Feb 9, 2026 2:31 AM
304Insider Transaction0001193125-26-043315Feb 9, 2026 2:09 AM
314Insider Transaction0001193125-26-043315Feb 9, 2026 2:09 AM
324Insider Transaction0001193125-26-043315Feb 9, 2026 2:09 AM
334Insider Transaction0001193125-26-038441Feb 5, 2026 11:30 AM
344Insider Transaction0001193125-26-038184Feb 4, 2026 2:44 AM
358-KCurrent Report0001193125-26-032004Jan 30, 2026 10:01 PM
368-KCurrent Report0001193125-25-325821Dec 19, 2025 1:25 PM
378-KCurrent Report0001193125-25-280518Nov 13, 2025 10:18 PM
3810-QQuarterly & Annual Report0001193125-25-280174Nov 13, 2025 9:10 PM
394Insider Transaction0001193125-25-278370Nov 12, 2025 1:44 AM
404Insider Transaction0000950170-25-112661Sep 3, 2025 10:04 AM
414Insider Transaction0000950170-25-112661Sep 3, 2025 10:04 AM
424Insider Transaction0000950170-25-112661Sep 3, 2025 10:04 AM
434Insider Transaction0000950170-25-112659Sep 3, 2025 10:02 AM
44SCHEDULE 13GBeneficial Ownership Report0000950170-25-109211Aug 14, 2025 1:48 AM
45S-8Prospectus0001193125-25-179082Aug 12, 2025 9:12 PM
4610-QQuarterly & Annual Report0000950170-25-107388Aug 12, 2025 8:31 PM
478-KCurrent Report0001193125-25-178970Aug 12, 2025 8:17 PM
488-KCurrent Report0001193125-25-142807Jun 18, 2025 9:12 PM
494Insider Transaction0000950170-25-087021Jun 16, 2025 12:32 AM
504Insider Transaction0000950170-25-087020Jun 16, 2025 12:30 AM
...

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