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The tickers below have the largest open-market purchases by chief executives and chief financial officers in the last 30 days. A CEO or CFO buying their own stock on the open market is one of the highest-conviction insider signals. How to read insider buying
| $14.75M |
| 4 |  $INTC INTEL CORP | $10.00M |
| 5 |  $BSX BOSTON SCIENTIFIC CORP | $9.00M |
| 6 |  $STFS Star Fashion Culture Holdings Ltd | $2.60M |
| 7 |  $APTV Aptiv PLC | $2.50M |
| 8 |  $CSGP COSTAR GROUP, INC. | $2.49M |
| 9 |  $FBIN Fortune Brands Innovations, Inc. | $2.02M |
| 10 |  $BRVE Braveheart Bio, Inc. | $2.00M |
| 11 |  $PRMB Primo Brands Corp | $2.00M |
| 12 |  $DINO HF Sinclair Corp | $1.28M |
| 13 |  $LITB LightInTheBox Holding Co., Ltd. | $1.09M |
| 14 |  $CLBK Columbia Financial, Inc./MD/ | $1.03M |
| 15 |  $ELV Elevance Health, Inc. | $1.00M |
| 16 |  $PFE PFIZER INC | $1.00M |
| 17 |  $TLSA Tiziana Life Sciences Ltd | $986K |
| 18 |  $HUN Huntsman CORP | $981K |
| 19 |  $MTDR Matador Resources Co | $975K |
| 20 |  $GBFH GBank Financial Holdings Inc. | $897K |
| 21 |  $OPFI OppFi Inc. | $851K |
| 22 |  $LINE Lineage, Inc. | $827K |
| 23 |  $SITE SiteOne Landscape Supply, Inc. | $816K |
| 24 |  $LUMN Lumen Technologies, Inc. | $613K |
| 25 |  $XRN Chiron Real Estate Inc. | $554K |
| 26 |  $ACI Albertsons Companies, Inc. | $553K |
| 27 |  $CAG CONAGRA BRANDS INC. | $511K |
| 28 |  $TSCO TRACTOR SUPPLY CO /DE/ | $502K |
| 29 |  $HLI HOULIHAN LOKEY, INC. | $501K |
| 30 |  $PRCT PROCEPT BioRobotics Corp | $498K |
| 31 |  $CCB COASTAL FINANCIAL CORP | $444K |
| 32 |  $ACDC ProFrac Holding Corp. | $402K |
| 33 |  $ABCL AbCellera Biologics Inc. | $384K |
| 34 |  $PRQR ProQR Therapeutics N.V. | $354K |
| 35 |  $RM Regional Management Corp. | $316K |
| 36 |  $BBBY BED BATH & BEYOND, INC. | $302K |
| 37 |  $JMKE Jersey Mike's Subs Inc. | $299K |
| 38 |  $AMRZ Amrize Ltd | $284K |
| 39 |  $HOG HARLEY-DAVIDSON, INC. | $259K |
| 40 |  $GPOR GULFPORT ENERGY CORP | $257K |
| 41 |  $BCML BayCom Corp | $251K |
| 42 |  $NSLR Neostellar Capital Corp. | $250K |
| 43 |  $SON SONOCO PRODUCTS CO | $249K |
| 44 |  $FUN Six Flags Entertainment Corporation/NEW | $248K |
| 45 |  $STRZ STARZ ENTERTAINMENT CORP /CN/ | $248K |
| 46 |  $GRML Greenland Mines Ltd | $245K |
| 47 |  $CIA CITIZENS, INC. | $243K |
| 48 |  $EMBC Embecta Corp. | $234K |
| 49 |  $SAGT SAGTEC GLOBAL Ltd | $231K |
| 50 |  $SODI SOLITRON DEVICES INC | $228K |
Directors see the business quarterly, through a board pack. The chief executive and chief financial officer see it daily, and they see the numbers before anyone outside the company does. When one of them buys on the open market, they are committing personal money against information advantage they cannot legally trade on, which is a deliberately uncomfortable position to take unless they mean it.
Size is worth reading relative to the person rather than in absolute terms. A chief financial officer putting a meaningful share of their own liquid wealth into stock says more than a founder-chief executive adding a rounding error to a stake they already hold.
