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HarperCollins' top 10 nearest neighbors are almost entirely fellow book publishers — nine of the ten share its subcategory, with Publishers Weekly (0.95) the sole Magazine in the set. The shape is flat: scores run from 0.96 down to 0.94 with no single dominant neighbor and no sharp drop-off, meaning the audience composition is consistent across the entire cluster.
Random House leads at 0.96, followed closely by Penguin Random House (0.96) and Simon & Schuster (0.95). Little, Brown and Co (0.95) and Alfred A. Knopf (0.95) sit just behind, with Atria Books (0.94), Scribner (0.94), Penguin Press (0.94), and Farrar, Straus & Giroux (0.94) rounding out the set. Publishers Weekly's presence at 0.95 — slotting between the publishers rather than trailing them — suggests the trade press draws an audience whose shape is nearly indistinguishable from the publishers themselves. No marketing channels, celebrities, or organizations appear in the top 10.
The flat, same-kind structure indicates HarperCollins' audience is defined tightly by the book publishing world, with little measurable bleed into adjacent media or personality-driven spaces at this range.
