| 09/03/2026 1:15 PM | Bergsvik Eirik (2035158) Reporting HMH (2021880) Issuer | Form 4 Statement of changes in beneficial ownership of securities | |
| 09/03/2026 1:16 PM | CHAUVIERE E CHARLS (1240953) Reporting HMH (2021880) Issuer | Form 4 Statement of changes in beneficial ownership of securities | |
| 09/03/2026 1:16 PM | Dyrseth Roy A. (2035162) Reporting HMH (2021880) Issuer | Form 4 Statement of changes in beneficial ownership of securities | |
| 09/03/2026 1:17 PM | HMH (2021880) Issuer McGee Thomas W. (2035200) Reporting | Form 4 Statement of changes in beneficial ownership of securities | |
| 09/03/2026 1:18 PM | HMH (2021880) Issuer Qureshi Hunain (2035763) Reporting | Form 4 Statement of changes in beneficial ownership of securities | |
| 09/03/2026 1:18 PM | HMH (2021880) Issuer Skogerbo Pal (2035218) Reporting | Form 4 Statement of changes in beneficial ownership of securities | |
| 09/03/2026 1:19 PM | HMH (2021880) Issuer RETTIG DWIGHT W (1228420) Reporting | Form 4 Statement of changes in beneficial ownership of securities | |
| 08/13/2026 3:05 PM | HMH (2021880) Subject | Form SCHEDULE 13G | |
| 08/12/2026 10:23 AM | HMH (2021880) Subject SCHRODER INVESTMENT MANAGEMENT GROUP (1086619) Filed by | Form SCHEDULE 13G | |
| 08/07/2026 1:20 PM | HMH (2021880) Subject PRICE T ROWE ASSOCIATES INC /MD/ (80255) Filed by | Form SCHEDULE 13G | |
| 08/07/2026 10:04 AM | FMR LLC (315066) Filed by HMH (2021880) Subject | Form SCHEDULE 13G | |
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| 08/05/2026 3:18 PM | HMH (2021880) Filer | Form 10-Q General form for quarterly reports under Section 13 or 15(d) | |
| 07/09/2026 4:36 PM | HMH (2021880) Subject MILLENNIUM MANAGEMENT LLC (1273087) Filed by | Form SCHEDULE 13G/A | |
| 06/23/2026 5:55 PM | HMH (2021880) Issuer Skogerbo Pal (2035218) Reporting | Form 4 Statement of changes in beneficial ownership of securities | |
| 06/23/2026 5:38 PM | Dyrseth Roy A. (2035162) Reporting HMH (2021880) Issuer | Form 4 Statement of changes in beneficial ownership of securities | |
| 06/23/2026 5:38 PM | HMH (2021880) Issuer Qureshi Hunain (2035763) Reporting | Form 4 Statement of changes in beneficial ownership of securities | |
| 06/23/2026 5:41 PM | HMH (2021880) Issuer RETTIG DWIGHT W (1228420) Reporting | Form 4 Statement of changes in beneficial ownership of securities | |
| 06/23/2026 5:42 PM | HMH (2021880) Issuer McGee Thomas W. (2035200) Reporting | Form 4 Statement of changes in beneficial ownership of securities | |
| 06/23/2026 5:47 PM | CHAUVIERE E CHARLS (1240953) Reporting HMH (2021880) Issuer | Form 4 Statement of changes in beneficial ownership of securities | |
| 06/23/2026 5:51 PM | Bergsvik Eirik (2035158) Reporting HMH (2021880) Issuer | Form 4 Statement of changes in beneficial ownership of securities | |
| 05/07/2026 2:08 PM | CHAUVIERE E CHARLS (1240953) Reporting HMH (2021880) Issuer | Form 4 Statement of changes in beneficial ownership of securities | |
| 05/07/2026 2:17 PM | HMH (2021880) Issuer RETTIG DWIGHT W (1228420) Reporting | Form 4 Statement of changes in beneficial ownership of securities | |
| 05/07/2026 1:56 PM | Dyrseth Roy A. (2035162) Reporting HMH (2021880) Issuer | Form 4 Statement of changes in beneficial ownership of securities | |
| 05/07/2026 1:57 PM | HMH (2021880) Issuer McGee Thomas W. (2035200) Reporting | Form 4 Statement of changes in beneficial ownership of securities | |
| 05/07/2026 2:00 PM | HMH (2021880) Issuer Skogerbo Pal (2035218) Reporting | Form 4 Statement of changes in beneficial ownership of securities | |
| 05/07/2026 2:04 PM | HMH (2021880) Issuer Qureshi Hunain (2035763) Reporting | Form 4 Statement of changes in beneficial ownership of securities | |
| 05/07/2026 2:06 PM | Bergsvik Eirik (2035158) Reporting HMH (2021880) Issuer | Form 4 Statement of changes in beneficial ownership of securities | |
| 05/06/2026 3:17 PM | HMH (2021880) Filer | Form 8-K Current report pursuant to Section 13 or 15(d) | |
| 05/06/2026 3:18 PM | HMH (2021880) Filer | Form 10-Q General form for quarterly reports under Section 13 or 15(d) | |
| 05/04/2026 7:24 PM | Akastor AS (2124921) Reporting Akastor ASA (2037057) Reporting HMH (2021880) Issuer Mercury HoldCo AS (2124920) Reporting Mercury HoldCo Inc. (2124922) Reporting | Form 4 Statement of changes in beneficial ownership of securities | |
| 05/04/2026 7:00 PM | Baker Hughes Co (1701605) Reporting Baker Hughes Co (1701605) Reporting Baker Hughes Holdings LLC (808362) Reporting HMH (2021880) Issuer | Form 4 Statement of changes in beneficial ownership of securities | |
| 04/09/2026 3:23 PM | CITADEL ADVISORS LLC (1423053) Filed by HMH (2021880) Subject | Form SCHEDULE 13G | |
| 04/08/2026 3:47 PM | HMH (2021880) Subject MILLENNIUM MANAGEMENT LLC (1273087) Filed by | Form SCHEDULE 13G | |
| 04/08/2026 3:14 PM | Encompass Capital Advisors LLC (1541901) Filed by HMH (2021880) Subject | Form SCHEDULE 13G | |
| 04/06/2026 3:26 PM | HMH (2021880) Subject Point72 Asset Management, L.P. (1603466) Filed by | Form SCHEDULE 13G | |
| 04/06/2026 1:51 PM | HMH (2021880) Issuer Stoknes Svein Oskar (2116277) Reporting | Form 4 Statement of changes in beneficial ownership of securities | |
| 04/06/2026 1:37 PM | Bergsvik Eirik (2035158) Reporting HMH (2021880) Issuer | Form 4 Statement of changes in beneficial ownership of securities | |
| 04/06/2026 1:37 PM | HMH (2021880) Issuer RETTIG DWIGHT W (1228420) Reporting | Form 4 Statement of changes in beneficial ownership of securities | |
| 04/06/2026 1:41 PM | HMH (2021880) Issuer Rabun Daniel Wayne (1354803) Reporting | Form 4 Statement of changes in beneficial ownership of securities | |
| 04/06/2026 1:41 PM | HMH (2021880) Issuer McAllister Kathleen S (1614884) Reporting | Form 4 Statement of changes in beneficial ownership of securities | |
| 04/06/2026 1:43 PM | HMH (2021880) Issuer Qureshi Hunain (2035763) Reporting | Form 4 Statement of changes in beneficial ownership of securities | |
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| 04/06/2026 1:44 PM | HMH (2021880) Issuer McGee Thomas W. (2035200) Reporting | Form 4 Statement of changes in beneficial ownership of securities | |
| 04/06/2026 1:45 PM | HMH (2021880) Issuer Loeffler Lance (1759163) Reporting | Form 4 Statement of changes in beneficial ownership of securities | |
| 04/06/2026 1:46 PM | HMH (2021880) Issuer Skogerbo Pal (2035218) Reporting | Form 4 Statement of changes in beneficial ownership of securities | |
| 04/06/2026 1:50 PM | Dyrseth Roy A. (2035162) Reporting HMH (2021880) Issuer | Form 4 Statement of changes in beneficial ownership of securities | |
| 04/06/2026 1:34 PM | CHAUVIERE E CHARLS (1240953) Reporting HMH (2021880) Issuer | Form 4 Statement of changes in beneficial ownership of securities | |
| 04/06/2026 1:36 PM | HMH (2021880) Issuer Kjelstad Karl Erik (2037060) Reporting | Form 4 Statement of changes in beneficial ownership of securities | |
| 04/02/2026 3:12 PM | HMH (2021880) Filer | Form 8-K Current report pursuant to Section 13 or 15(d) | |
| 04/01/2026 3:48 PM | HMH (2021880) Filer | Form 424B4 | |
| 04/01/2026 9:33 AM | HMH (2021880) Issuer Loeffler Lance (1759163) Reporting | Form 3 Initial statement of beneficial ownership of securities | |
| 04/01/2026 9:26 AM | HMH (2021880) Issuer McAllister Kathleen S (1614884) Reporting | Form 3 Initial statement of beneficial ownership of securities | |
| 03/31/2026 11:15 PM | HMH (2021880) Filer | Form EFFECT | |
| 03/31/2026 4:41 PM | HMH (2021880) Issuer Magno Maria Georgia (2006809) Reporting | Form 3 Initial statement of beneficial ownership of securities | |
| 03/31/2026 4:22 PM | HMH (2021880) Issuer Stoknes Svein Oskar (2116277) Reporting | Form 3 Initial statement of beneficial ownership of securities | |
| 03/31/2026 4:28 PM | Bailey Judson E. (2035404) Reporting HMH (2021880) Issuer | Form 3 Initial statement of beneficial ownership of securities | |
| 03/31/2026 4:30 PM | HMH (2021880) Issuer Kjelstad Karl Erik (2037060) Reporting | Form 3 Initial statement of beneficial ownership of securities | |
| 03/31/2026 4:13 PM | HMH (2021880) Issuer McGee Thomas W. (2035200) Reporting | Form 3 Initial statement of beneficial ownership of securities | |
| 03/31/2026 4:18 PM | HMH (2021880) Issuer Skogerbo Pal (2035218) Reporting | Form 3 Initial statement of beneficial ownership of securities | |
| 03/31/2026 4:19 PM | HMH (2021880) Issuer RETTIG DWIGHT W (1228420) Reporting | Form 3 Initial statement of beneficial ownership of securities | |
| 03/31/2026 4:19 PM | HMH (2021880) Issuer Qureshi Hunain (2035763) Reporting | Form 3 Initial statement of beneficial ownership of securities | |
| 03/31/2026 4:06 PM | CHAUVIERE E CHARLS (1240953) Reporting HMH (2021880) Issuer | Form 3 Initial statement of beneficial ownership of securities | |
| 03/31/2026 4:06 PM | Dyrseth Roy A. (2035162) Reporting HMH (2021880) Issuer | Form 3 Initial statement of beneficial ownership of securities | |
| 03/31/2026 4:08 PM | HMH (2021880) Issuer Rabun Daniel Wayne (1354803) Reporting | Form 3 Initial statement of beneficial ownership of securities | |
| 03/31/2026 4:08 PM | Bergsvik Eirik (2035158) Reporting HMH (2021880) Issuer | Form 3 Initial statement of beneficial ownership of securities | |
| 03/31/2026 3:53 PM | Baker Hughes Co (1701605) Reporting Baker Hughes Co (1701605) Reporting Baker Hughes Holdings LLC (808362) Reporting HMH (2021880) Issuer | Form 3 Initial statement of beneficial ownership of securities | |
| 03/31/2026 1:45 PM | HMH (2021880) Filer | Form CERT | |
| 03/31/2026 10:04 AM | HMH (2021880) Filer | Form 8-A12B | |
| 03/23/2026 3:05 PM | HMH (2021880) Filer | Form S-1/A | |
| 11/10/2025 3:57 PM | HMH (2021880) Filer | Form S-1/A | |