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Mailing Address 675 MASSACHUSETTS AVENUE 14TH FLOOR CAMBRIDGE MA 02139
Business Address 675 MASSACHUSETTS AVENUE 14TH FLOOR CAMBRIDGE MA 02139 857-242-1600
Spero Therapeutics, Inc. CIK#: 0001701108 (see all company filings)

SIC: 2834 - PHARMACEUTICAL PREPARATIONS
State location: MA | State of Inc.: DE | Fiscal Year End: 1231
formerly: Spero Therapeutics, LLC (filings through 2017-03-21)
(CF Office: 03 Life Sciences)
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Items 1 - 40  0001701108 Filings RSS Feed
Filings Format Description Filed/Effective File/Film Number
ARS  Documents Annual Report to Security Holders
Acc-no: 0001193125-24-097774 (34 Act)  Size: 1 MB
2024-04-16 001-38266
24848062
DEFA14A  Documents Additional definitive proxy soliciting materials and Rule 14(a)(12) material
Acc-no: 0001193125-24-097763 (34 Act)  Size: 147 KB
2024-04-16 001-38266
24848016
DEF 14A  Documents   Interactive Data Other definitive proxy statements
Acc-no: 0001193125-24-097749 (34 Act)  Size: 2 MB
2024-04-16 001-38266
24847948
8-K  Documents   Interactive Data Current report, item 8.01
Acc-no: 0001193125-24-082060 (34 Act)  Size: 143 KB
2024-03-29 001-38266
24804185
EFFECT  Documents Notice of Effectiveness
Acc-no: 9999999995-24-000719 (33 Act)  Size: 1 KB
2024-03-22 16:00:00 333-277998
24776780
S-3  Documents Registration statement under Securities Act of 1933
Acc-no: 0001193125-24-069196 (33 Act)  Size: 1 MB
2024-03-15 333-277998
24755366
S-8  Documents Securities to be offered to employees in employee benefit plans
Acc-no: 0001193125-24-069149 (33 Act)  Size: 76 KB
2024-03-15 333-277984
24755032
10-K  Documents   Interactive Data Annual report [Section 13 and 15(d), not S-K Item 405]
Acc-no: 0000950170-24-030767 (34 Act)  Size: 14 MB
2024-03-13 001-38266
24746020
8-K  Documents   Interactive Data Current report, items 2.02 and 9.01
Acc-no: 0001193125-24-066825 (34 Act)  Size: 231 KB
2024-03-13 001-38266
24745973
SC 13G  Documents Statement of acquisition of beneficial ownership by individuals
Acc-no: 0001193125-24-036304 (34 Act)  Size: 128 KB
2024-02-14 005-90168
24638872
8-K  Documents   Interactive Data Current report, item 5.02
Acc-no: 0001193125-24-029913 (34 Act)  Size: 148 KB
2024-02-09 001-38266
24614701
8-K  Documents   Interactive Data Current report, items 7.01 and 9.01
Acc-no: 0001193125-24-003807 (34 Act)  Size: 3 MB
2024-01-08 001-38266
24518185
8-K  Documents   Interactive Data Current report, items 2.02, 7.01, 8.01, and 9.01
Acc-no: 0001193125-24-002894 (34 Act)  Size: 3 MB
2024-01-05 001-38266
24514482
8-K  Documents   Interactive Data Current report, items 7.01, 8.01, and 9.01
Acc-no: 0001193125-24-000249 (34 Act)  Size: 179 KB
2024-01-02 001-38266
24500344
S-8  Documents Securities to be offered to employees in employee benefit plans
Acc-no: 0001193125-23-276143 (33 Act)  Size: 163 KB
2023-11-13 333-275515
231399701
S-8  Documents Securities to be offered to employees in employee benefit plans
Acc-no: 0001193125-23-276127 (33 Act)  Size: 76 KB
2023-11-13 333-275514
231399621
8-K  Documents   Interactive Data Current report, items 2.02 and 9.01
Acc-no: 0001193125-23-276030 (34 Act)  Size: 226 KB
2023-11-13 001-38266
231398854
10-Q  Documents   Interactive Data Quarterly report [Sections 13 or 15(d)]
Acc-no: 0000950170-23-062897 (34 Act)  Size: 10 MB
2023-11-13 001-38266
231398469
8-K  Documents   Interactive Data Current report, items 5.02, 8.01, and 9.01
Acc-no: 0001193125-23-267758 (34 Act)  Size: 179 KB
2023-11-01 001-38266
231366648
8-K/A  Documents   Interactive Data [Amend] Current report, items 5.03, 5.07, and 9.01
Acc-no: 0001193125-23-256865 (34 Act)  Size: 166 KB
2023-10-16 001-38266
231327360
8-K  Documents   Interactive Data Current report, items 5.02, 5.03, 5.07, and 9.01
Acc-no: 0001193125-23-253136 (34 Act)  Size: 325 KB
2023-10-10 001-38266
231315823
ARS  Documents Annual Report to Security Holders
Acc-no: 0001193125-23-227646 (34 Act)  Size: 13 MB
2023-09-01 001-38266
231232634
DEF 14A  Documents Other definitive proxy statements
Acc-no: 0001193125-23-227642 (34 Act)  Size: 2 MB
2023-09-01 001-38266
231232596
PRE 14A  Documents Other preliminary proxy statements
Acc-no: 0001193125-23-218127 (34 Act)  Size: 2 MB
2023-08-22 001-38266
231194603
S-8  Documents Securities to be offered to employees in employee benefit plans
Acc-no: 0001193125-23-209085 (33 Act)  Size: 261 KB
2023-08-10 333-273880
231159937
8-K  Documents   Interactive Data Current report, items 2.02 and 9.01
Acc-no: 0001193125-23-209064 (34 Act)  Size: 214 KB
2023-08-10 001-38266
231159752
10-Q  Documents   Interactive Data Quarterly report [Sections 13 or 15(d)]
Acc-no: 0000950170-23-041314 (34 Act)  Size: 11 MB
2023-08-10 001-38266
231159394
8-K  Documents   Interactive Data Current report, items 7.01, 8.01, and 9.01
Acc-no: 0001193125-23-198589 (34 Act)  Size: 180 KB
2023-07-31 001-38266
231125136
8-K  Documents   Interactive Data Current report, items 5.02, 8.01, and 9.01
Acc-no: 0001193125-23-166543 (34 Act)  Size: 196 KB
2023-06-14 001-38266
231013044
8-K  Documents   Interactive Data Current report, items 2.02 and 9.01
Acc-no: 0001193125-23-142023 (34 Act)  Size: 202 KB
2023-05-11 001-38266
23911139
10-Q  Documents   Interactive Data Quarterly report [Sections 13 or 15(d)]
Acc-no: 0000950170-23-021187 (34 Act)  Size: 8 MB
2023-05-11 001-38266
23910805
S-8  Documents Securities to be offered to employees in employee benefit plans
Acc-no: 0001193125-23-085694 (33 Act)  Size: 76 KB
2023-03-30 333-271000
23781344
8-K  Documents   Interactive Data Current report, items 2.02 and 9.01
Acc-no: 0001193125-23-085566 (34 Act)  Size: 227 KB
2023-03-30 001-38266
23780865
10-K  Documents   Interactive Data Annual report [Section 13 and 15(d), not S-K Item 405]
Acc-no: 0000950170-23-010921 (34 Act)  Size: 17 MB
2023-03-30 001-38266
23780576
SC 13G/A  Documents [Amend] Statement of acquisition of beneficial ownership by individuals
Acc-no: 0000921895-23-000526 (34 Act)  Size: 266 KB
2023-02-14 005-90168
23625002
SC 13G/A  Documents [Amend] Statement of acquisition of beneficial ownership by individuals
Acc-no: 0001591986-23-000003 (34 Act)  Size: 80 KB
2023-02-14 005-90168
23624644
8-K  Documents   Interactive Data Current report, item 5.02
Acc-no: 0001193125-23-021612 (34 Act)  Size: 152 KB
2023-02-01 001-38266
23577183
SC 13D/A  Documents [Amend] General statement of acquisition of beneficial ownership
Acc-no: 0001387131-23-000462 (34 Act)  Size: 41 KB
2023-01-20 005-90168
23541035
CT ORDER  Documents Confidential treatment order
Acc-no: 9999999997-23-000264 (34 Act)  Size: 160 KB
2023-01-19 001-38266
23536921
8-K  Documents   Interactive Data Current report, items 2.02, 7.01, 8.01, and 9.01
Acc-no: 0001193125-23-004190 (34 Act)  Size: 15 MB
2023-01-09 001-38266
23516698