Definition
Ownership percentage is the proportion of DFS contest entries that roster a specific player. In a 10,000-entry GPP, a player at 35% ownership appears in 3,500 lineups. High-owned players are "chalk." Low-owned players are "contrarian." Ownership projections are published pre-lock by DFS analysts; actual ownership is revealed post-lock. Ownership is irrelevant in cash games (50/50s, head-to-heads); it's the most important GPP variable because it determines leverage when a player over- or under-performs projections.
Worked Example
Slate: two RBs with equal 18-point projections. RB-X: 52% projected ownership. RB-Y: 9% projected ownership. Both score 22 points. RB-X: 52% of field covered that upside — minimal differentiation. RB-Y: 91% of field missed those 22 points — every lineup with RB-Y jumped 4 points on 91% of field. GPP ROI on identical scoring performances differs by 5–10× based solely on ownership.
Why It Matters
Ownership converts raw player performance into contest rank movement. The same points from a 5%-owned player are worth exponentially more in a large GPP than from a 50%-owned player — making ownership the multiplier applied to every projection.