Ryan Tannehill had the most completions by a quarterback in his first 4 seasons, with 1,392 completions.

which qb has the most passing comp in first 4 season
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TannehillCarrPrescottManningBortlesWentzBledsoePalmerDaltonMarinoAllenRyanLuckGarciaFlaccoWatsonMayfieldWinstonGoffNewtonWilsonMahomes1.4k1.4k1.4k1.4k1.3k1.3k1.3k1.3k1.3k1.2k1.2k1.2k1.2k1.2k1.2k1.2k1.2k1.2k1.2k1.1k1.1k1.1k
NAMEGPCMPATTPCTYDSAVGYDS/GTDTD%INTINT%SCKSCKYRATE
Ryan TannehillRyan Tannehill641,3922,24861.915,4606.9241.6873.9542.41841,39085.2
Derek CarrDerek Carr621,3782,24761.314,6906.5236.91034.6442.09155987.5
Dak PrescottDak Prescott641,3632,07165.815,7787.6246.5974.7361.713682697.0
Peyton ManningPeyton Manning641,3572,22661.016,4187.4256.51115.0813.68558885.1
Blake BortlesBlake Bortles621,3182,22959.114,9286.7240.8904.0642.916498580.8
Carson WentzCarson Wentz561,3112,05563.814,1916.9253.4974.7351.712980792.7
Drew BledsoeDrew Bledsoe601,3102,37955.114,6426.2244.0803.4733.19159872.0
Carson PalmerCarson Palmer611,3052,03664.114,8997.3244.21045.1633.19763590.1
Andy DaltonAndy Dalton641,3012,11161.614,7587.0230.6994.7663.112069585.2
Dan MarinoDan Marino591,2492,05060.916,1777.9274.21426.9673.35847695.2
Josh AllenJosh Allen611,2451,99962.314,1147.1231.41035.2462.311877391.0
Matt RyanMatt Ryan621,2322,02260.914,2387.0229.6954.7462.38552788.4
Andrew LuckAndrew Luck551,2242,10658.114,8387.0269.81014.8552.611572285.0
Jeff GarciaJeff Garcia611,2241,96862.213,7047.0224.7954.8432.28246689.9
Joe FlaccoJoe Flacco641,1901,95860.813,8167.1215.9804.1462.313999186.0
Deshaun WatsonDeshaun Watson541,1861,74867.814,5398.3269.21045.9362.11741,050104.5
Baker MayfieldBaker Mayfield601,1851,92461.614,1257.3235.4924.8562.913488987.8
Jameis WinstonJameis Winston561,1831,92261.614,6287.6261.2884.6583.012279387.8
Jared GoffJared Goff541,1661,86962.414,2197.6263.3874.7422.210678791.9
Cam NewtonCam Newton621,1441,92359.514,4267.5232.7824.3542.81521,14085.4
Russell WilsonRussell Wilson641,1231,73564.713,9748.1218.31066.1342.0164982101.8
Patrick MahomesPatrick Mahomes461,1141,68766.014,1528.4307.71146.8241.467460108.7
Matthew StaffordMatthew Stafford451,1141,86359.812,8076.9284.6804.3542.99367482.8
Josh FreemanJosh Freeman571,1011,87358.812,9636.9227.4784.2633.410362279.8
Jay CutlerJay Cutler531,0981,77561.912,6907.1239.4814.6633.58651183.8
StatMuse has season-level data for completions going back to the 1932 season.