Theo Gillen

The card rack

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FlagshipTheo Gillen #BD-73 · 2024 Bowman Draft · 47 recent sales 7N ▲0%

$1.59Raw$7.95PSA 9$10.00PSA 10$13.00BGS 10PSA 10 · 54 nights

Live on eBay now · asking, not sold · as of 2026-10-04 · paid links

$1.49Ungraded$1.50Ungraded$1.50Ungraded

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The rookieTheo Gillen #BMA-TG · 2025 Bowman Chrome Mega Box Prospects Autograph · 65 recent sales 7N ▼6%

$22.34Raw$43.71PSA 9$121PSA 10$157BGS 10PSA 10 · 55 nights

Live on eBay now · asking, not sold · as of 2026-10-04 · paid links

$29.99Ungraded$29.99Ungraded$29.99Ungraded

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Paid link — as an eBay Partner, FVR earns from qualifying purchases. · Flagship = his most-traded card (the market’s reference); the rookie = the top card of his first card year. As of October 4, 2026 · trend is FVR's own nightly archive · prices via SportsCardsPro · what these terms mean

Scout’s note

Gillen went 2024 first-round out of Chicago, and FanGraphs slots him No. 15 on their in-season board. Our engine can't rank him: the ballparks at AA, where he's playing for Montgomery, aren't wired for tracked batted balls, so there is no percentile and no EV95 to read. What the box score shows — .288 with a .894 OPS and 10 homers across 59 AA games — belongs to the box score. The page is here because a 21-year-old left-handed bat matters, not because we can vouch for the physics yet.

Note written Oct 3 · FVR scout (GLM-5.2)

The engine's view

The read: FanGraphs has Gillen No. 15 on its in-season board. Our signals come off tracked batted balls, and the ballparks are wired at Triple-A and in the majors — not at AA, where he is playing. That is not a thin sample, it is none: there is no percentile for him here and we do not rank him on one. The page is here because the player matters.

The Wire

△ On the field: Only three prospects post 20+ HR, 15+ SB and hit .300+: Josue De Paula, Theo Gillen, Seaver King.

X chatter, trailing 2 days · as of 2026-09-23 · newest post 2026-09-21 · summarized by Grok (xAI) · how this works →

Collect Theo Gillen

If the signal is right, the cardboard usually finds out later. Current listings:

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Not financial advice. We take positions only after publication — never before. Misses stay on the record.