** Shares of Affirm AFRM.O down 3.3% at $70.49 premarket as buy now, pay later firm seeks capital raise

** San Francisco-based co late Mon announced private offering of $750 mln 5-yr convertible bonds (CBs)

** It plans to use net proceeds to repurchase portion of its 0% CBs due 2026, use portion to buy back $300 mln of its common stock, any remaining for general purposes

** On Fri, Affirm announced partnership with Sixth Street TSLX.N whereby the investment firm agreed to invest up to $4 bln worth by purchasing Affirm's loans over three years

** Last month, Affirm posted narrower qtrly net loss and 41% yr/yr jump in rev as active customers count climbed to 19.5 mln from 16.9 mln in yr-ago period

** Through Mon, AFRM shares have risen ~78% since end-Sept, putting them up 48% YTD

** Co has roughly $23 bln market cap, per LSEG

(Lance Tupper is a Reuters market analyst. The views expressed are his own)

((lance.tupper@tr.com 1-646-279-6380))