A three-axis MEMS transducer featuring a caddie-corner proof mass comprises a planar main body portion of conductive material and a planar extra mass caddie-corner feature. The main body portion includes a width, length, and at least four side edges. An x-axis sense direction is defined from a first side edge to an opposite first side edge and a y-axis sense direction is defined from a second side edge to an opposite second side edge. The x-axis sense direction is perpendicular to the y-axis sense direction. The main body portion further includes at least two corners. The caddie-corner feature is positioned about at least one of the two corners of the main body portion. The caddie-corner feature and the main body portion comprise a single proof mass having a z-sense pivot axis disposed at an angle of ninety degrees to a diagonal extending from the caddie-corner feature to an opposite corner of the main body portion. The proof mass is configured to teeter-totter corner to corner about the z-sense pivot axis in response z-axis acceleration and/or z-axis deceleration.