AAA · CF · Montgomery Biscuits (TB)
Theo Gillen
B/T L/R · 6' 2" · 195 lb · born Chicago, IL, USA · age 20 · draft 2024 rd 1
Last 14 days (through 2026-08-11): 10 G · .333 AVG · 4 HR · 6 RBI · 1.141 OPS
The card rack
FlagshipTheo Gillen #BD-73 · 2024 Bowman Draft · 32 recent sales
Live on eBay now · asking, not sold · as of 2026-08-11 · paid links
The rookieTheo Gillen #BMA-TG · 2025 Bowman Chrome Mega Box Prospects Autograph · 50 recent sales
Live on eBay now · asking, not sold · as of 2026-08-11 · paid links
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 August 11, 2026 · trend is FVR's own nightly archive · prices via SportsCardsPro · what these terms mean
Scout’s note
Gillen, a 2024 first-round pick out of Chicago, IL, is on our radar. He's in our Index — tracked, not flagged. The boards bet on mispricing, and right now his account with reality is square.
The engine's view
The read: The market calls Gillen the consensus No. 16 prospect in baseball, and that is why he is off our boards: they hold the consensus top 25 off on purpose, so no board flag is coming while he is ranked there. This page is a different question, and it waits only on sample — a percentile lands at 80 balls in play.
Collect Theo Gillen
If the signal is right, the cardboard usually finds out later. Current listings:
Theo Gillen cards on eBay →Paid link — as an eBay Partner, FVR earns from qualifying purchases.
Not financial advice. We take positions only after publication — never before. Misses stay on the record.
The line
| Year | Team | Lvl | G | AB | R | H | HR | RBI | SB | BB | SO | AVG | OPS |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2024 | Charleston RiverDogs | A | 8 | 26 | 4 | 4 | 0 | 2 | 1 | 8 | 14 | .154 | .545 |
| 2025 | Charleston RiverDogs | A | 73 | 243 | 62 | 65 | 5 | 18 | 36 | 64 | 75 | .267 | .820 |
| 2026 | Bowling Green Hot Rods | A+ | 57 | 219 | 53 | 75 | 12 | 44 | 28 | 38 | 63 | .342 | 1.038 |
| 2026 | Montgomery Biscuits | AA | 33 | 130 | 24 | 38 | 8 | 30 | 11 | 22 | 32 | .292 | .953 |
Bio & season lines: MLB StatsAPI · refreshed nightly · abbreviations →