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C4 Therapeutics, Inc.

CCCC
Exchange
Nasdaq
Industry
Biological Products, (No Diagnostic Substances)
SEC CIK
0001662579

No open-market purchases or sales by C4 Therapeutics, Inc. insiders were filed in the last 90 days; 148 institutions reported holding it in 13F filings for Q2 2026, worth $547.9M in total; no superinvestor holds it.

Holders of 5% or more of CCCC

Holders whose latest Schedule 13D or 13G filing reports 5% or more of C4 Therapeutics, Inc., largest stake first. The change is against the holder's previous filing.

Holders of 5% or more of CCCC
HolderLatest formStakeChangeFirst filedLatest filingFiling
Lynx1 Capital Management LP13G/A9.99%15.4M shares+2.69 ppfrom 7.30%Nov 13, 20235 filingsAug 14, 2026SEC
Soleus Capital Master Fund, L.P.13G/A9.99%10.4M shares–Apr 14, 20235 filingsFeb 12, 2026SEC
Sirenia Capital Management LP13G9.90%23.5M sharesNewMay 15, 20261 filingMay 15, 2026SEC
Ra Capital Management, L.P.13G/A9.90%11.4M shares0.00 ppfrom 9.90%Dec 26, 20234 filingsAug 14, 2026SEC
Morgan Stanley13G/A8.00%8.86M shares−1.30 ppfrom 9.30%Feb 3, 20254 filingsAug 12, 2026SEC
BlackRock, Inc.13G6.90%7.68M shares+4.40 ppfrom 2.50%Oct 22, 20244 filingsJul 27, 2026SEC
Squadron Capital Management LLC13G/A6.90%7.60M shares+1.90 ppfrom 5.00%May 19, 20262 filingsAug 14, 2026SEC
Bain Capital Life Sciences Fund II, L.P.13G6.25%6.06M sharesNewOct 24, 20251 filingOct 24, 2025SEC

Stakes are as of each holder's latest filing. Holders whose last filing was in the old format (before December 18, 2024) have no stake on record and are not listed, and after an acquisition or delisting holders usually stop filing.

13D and 13G filings

65 Schedule 13D and 13G filings on C4 Therapeutics, Inc., newest first, including old-format filings without a stake.

Schedule 13D and 13G filings on CCCC
Filed (ET)FilerFormStakeChangeEvent dateFiling
Aug 14, 20264:40 PM ETRa Capital Management, L.P.and 3 others13G/A9.90%11.4M shares0.00 ppfrom 9.90%Jun 30, 2026SEC
Aug 14, 20264:32 PM ETLynx1 Capital Management LPand 1 other13G/A9.99%15.4M shares+2.69 ppfrom 7.30%Jun 30, 2026SEC
Aug 14, 202612:54 PM ETSquadron Capital Management LLCand 3 others13G/A6.90%7.60M shares+1.90 ppfrom 5.00%Jun 30, 2026SEC
Aug 12, 20264:41 PM ETMorgan Stanleyand 2 others13G/A8.00%8.86M shares−1.30 ppfrom 9.30%Jun 30, 2026SEC
Jul 27, 20264:25 PM ETBlackRock, Inc.13G6.90%7.68M shares+4.40 ppfrom 2.50%Jun 30, 2026SEC
May 19, 20264:09 PM ETSquadron Capital Management LLCand 3 others13G5.00%5.55M sharesNewMay 12, 2026SEC
May 15, 20264:20 PM ETPoint72 Asset Management, L.P.and 2 others13G/A0.20%169.1K shares−9.70 ppfrom 9.90%Below 5%Mar 31, 2026SEC
May 15, 20268:10 AM ETSirenia Capital Management LPand 1 other13G9.90%23.5M sharesNewMar 31, 2026SEC
Apr 22, 20265:27 PM ETWasatch Advisors Inc13G/A4.70%4.58M shares−2.10 ppfrom 6.80%Below 5%Mar 31, 2026SEC
Feb 17, 20266:18 PM ETOrbiMed Advisors LLCand 1 other13G/A1.00%883.5K shares−4.00 ppfrom 5.00%Below 5%Dec 31, 2025SEC
Feb 17, 20261:45 PM ETLynx1 Capital Management LPand 1 other13G/A7.30%7.10M shares–Dec 31, 2025SEC
Feb 12, 20265:02 PM ETSoleus Capital Master Fund, L.P.and 8 others13G/A9.99%10.4M shares–Dec 31, 2025SEC
Feb 11, 202612:58 PM ETMorgan Stanleyand 1 other13G/A9.30%8.97M shares+2.60 ppfrom 6.70%Dec 31, 2025SEC
Nov 14, 20256:08 PM ETOrbiMed Advisors LLCand 1 other13G/A5.00%3.57M shares−1.60 ppfrom 6.60%Sep 30, 2025SEC
Nov 13, 20255:33 PM ETWasatch Advisors Inc13G/A6.80%4.85M shares−3.70 ppfrom 10.50%Sep 30, 2025SEC
Oct 24, 20254:30 PM ETBain Capital Life Sciences Fund II, L.P.and 2 others13G6.25%6.06M sharesNewOct 17, 2025SEC
Oct 24, 20254:13 PM ETRa Capital Management, L.P.and 3 others13G9.90%9.44M shares+9.90 ppfrom 0.00%Oct 17, 2025SEC
Oct 20, 20255:58 PM ETPoint72 Asset Management, L.P.and 2 others13G9.90%22.6M shares–Oct 17, 2025SEC
Aug 7, 202512:50 PM ETMorgan Stanley13G/A6.70%4.75M shares+1.30 ppfrom 5.40%Jun 30, 2025SEC
Jul 16, 20257:02 PM ETBlackRock, Inc.13G/A2.50%1.76M shares–Below 5%Jun 30, 2025SEC
May 15, 20258:09 PM ETOrbiMed Advisors LLCand 1 other13G/A6.60%4.66M shares–Mar 31, 2025SEC
May 15, 20254:52 PM ETRa Capital Management, L.P.and 3 others13G/A0.00%0 shares–Below 5%Mar 31, 2025SEC
May 7, 20251:39 PM ETWasatch Advisors Inc13G/A10.50%7.47M shares–Apr 30, 2025SEC
Feb 3, 20251:59 PM ETMorgan Stanley13G5.40%3.83M sharesNewDec 31, 2024SEC
Nov 14, 2024Commodore Capital LP13G/AOld format–––SEC
Nov 14, 2024Soleus Capital Master Fund, L.P.13G/AOld format–––SEC
Nov 14, 2024OrbiMed Advisors LLC13GOld format–New–SEC
Nov 14, 2024Point72 Asset Management, L.P.13G/AOld format–––SEC
Nov 14, 2024Lynx1 Capital Management LP13G/AOld format–––SEC
Nov 14, 2024Price T Rowe Associates Inc13G/AOld format–––SEC
Nov 8, 2024BlackRock, Inc.13GOld format–––SEC
Oct 22, 2024BlackRock, Inc.13GOld format–New–SEC
Jul 10, 2024State Street Corp13G/AOld format–––SEC
Apr 10, 2024State Street Corp13GOld format–New–SEC
Mar 8, 2024Wasatch Advisors Inc13G/AOld format–––SEC
Feb 14, 2024Lynx1 Capital Management LP13G/AOld format–––SEC
Feb 14, 2024RTW Investments, LP13G/AOld format–––SEC
Feb 14, 2024Price T Rowe Associates Inc13G/AOld format–––SEC
Feb 9, 2024Wasatch Advisors Inc13G/AOld format–––SEC
Feb 5, 2024Soleus Capital Master Fund, L.P.13GOld format–––SEC
Feb 2, 2024Soleus Capital Master Fund, L.P.13G/AOld format–––SEC
Jan 12, 2024Betta Investment (Hong Kong) Ltd.13GOld format–New–SEC
Jan 4, 2024Point72 Asset Management, L.P.13GOld format–New–SEC
Dec 26, 2023Ra Capital Management, L.P.13GOld format–New–SEC
Dec 22, 2023Commodore Capital LP13GOld format–New–SEC
Nov 13, 2023Lynx1 Capital Management LP13GOld format–New–SEC
Jul 25, 2023Millennium Management LLC13GOld format–New–SEC
Jul 7, 20234:35 PM ETBlackRock Inc.13G/AOld format–––SEC
Jun 12, 2023ArrowMark Colorado Holdings LLC13G/AOld format–––SEC
Apr 14, 2023Soleus Capital Master Fund, L.P.13GOld format–New–SEC

Form 144: proposed insider sales

10 notices from officers, directors and other affiliates planning to sell C4 Therapeutics, Inc. shares, newest first.

Form 144 notices for CCCC
Filed (ET)SellerShares to sellMarket valuePlanned saleBrokerFiling
Nov 12, 20264:23 PM ETKendra AdamsOfficer45.2K$122.5KNov 12, 202610b5-1Morgan Stanley Smith Barney LLC Executive Financial ServicesSEC
Aug 14, 20267:14 PM ETMark MosslerOfficer4.14K$17.6KAug 14, 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesSEC
Aug 14, 20266:56 PM ETJay GeldmacherFormer REZI CEO82.6K$1.90MAug 14, 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesSEC
Aug 13, 20264:18 PM ETMark MosslerOfficer15.0K$61.1KAug 13, 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesSEC
Aug 12, 20265:31 PM ETMark MosslerOfficer19.5K$76.7KAug 12, 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesSEC
May 28, 20268:31 PM ETMark MosslerFormer Section 16 Officer9.09K$35.5KMay 27, 2026E*TradeSEC
Mar 9, 20264:20 PM ETJolie M SiegelOfficer101.2K$378.8KMar 9, 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesSEC
Nov 18, 20244:43 PM ETSalter MalcolmDirector13.0K$54.5KNov 18, 2024Morgan Stanley Smith Barney LLC Executive ServicesSEC
Oct 18, 20244:45 PM ETSalter MalcolmDirector13.0K$83.3KOct 18, 2024Morgan Stanley Smith Barney LLC Executive ServicesSEC
Oct 11, 20245:37 PM ETSalter MalcolmDirector8.56K$46.1KOct 11, 2024MORGAN STANLEY SMITH BARNEY LLC EXECUTIVE SERVICESSEC