Stock turns an opponent's offense into ammunition. Garvey swallows an incoming attack, banks it as a lump that swells on his back, and holds it until a moment of his choosing, when the growth detaches, drifts around to his face, and spits the stored blow back out.
Stock is the emitter Quirk wielded by the villain Garvey, with a range listed as variable since the output depends on whatever was taken in. It debuts in Chapter 63 of Vigilantes and appears in Episode 21 of that series' adaptation.
The concept is parasitic by design. Rather than generating power, the Quirk runs entirely on what an enemy commits to throwing, which makes aggression against Garvey a form of resupply.
The core function is absorption paired with delayed release. Garvey takes in attacks, stores them, and lets them loose at a time he selects rather than being forced to counter immediately.
The physical process is grotesque and specific. He has to devour the incoming attack, after which a lump forms on his back holding the captured energy. When he wants it, the lump separates from him and floats forward until it hangs in front of his face, at which point the stored attack comes back out.
Garvey is the only confirmed holder, and the Quirk stays within the Vigilantes continuity.
Panels show him taking in several attacks at once, which suggests he is not restricted to one banked blow at a time, though no hard cap on his capacity has been established.

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Garvey's Quirk is Stock, an emitter type ability introduced in the Vigilantes spinoff that lets him absorb an opponent's attack, store it, and release it later.
Using Stock, Garvey devours an incoming attack, which forms a lump on his back holding the captured energy. When he chooses, the lump detaches and floats to his face before releasing the stored attack.
Garvey appears able to absorb several attacks at once with Stock, though My Hero Academia has not established any confirmed limit to how much he can hold.
The Stock Quirk debuts in Chapter 63 of the Vigilantes manga and appears in Episode 21 of its anime adaptation.
Stock functions as both, since Garvey uses it to absorb an enemy's offense and then turn that same captured attack back on them as his own weapon.
Looking for more on Stock? The Dragon Ball Wiki on Fandom has a dedicated page with community notes.
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