Filed under Rule 424(b)(2), Registration Statement No. 333-183535

Preliminary Pricing Supplement No 25 - Dated Monday, September 9, 2013 (To: Prospectus dated August 24, 2012)

CUSIP Principal   Gross Net Coupon Coupon Coupon Maturity 1st Coupon 1st Coupon Survivor's Product
Number Amount Selling Price Concession Proceeds Type Rate Frequency Date Date Amount Option Ranking
02006DCD1 [] 100.000% 1.125% [] Fixed 3.250% Monthly 09/15/2016 10/15/2013 $2.35 No Senior Unsecured Notes
Redemption Information: Callable at 100% on 9/15/2014 and Monthly thereafter with 30 Calendar Days Notice.
02006DCE9 [] 100.000% 1.700% [] Fixed 4.700% Monthly 09/15/2018 10/15/2013 $3.39 No Senior Unsecured Notes
Redemption Information: Callable at 100% on 9/15/2014 and Monthly thereafter with 30 Calendar Days Notice.

Ally Financial Inc.

Offering Date: Monday, September 9, 2013 through Monday, September 16, 2013

Trade Date: Monday, September 16, 2013 @ 12:00 PM ET

Settle Date: Thursday, September 19, 2013

Minimum Denomination/Increments:$1,000.00/$1,000.00

Initial trades settle flat and clear SDFS: DTC Book Entry only

DTC Number 0235 via RBC Dain Rauscher Inc

   

Agents: Incapital, LLC, Citigroup, RBC Capital Markets, Morgan Stanley, J.P. Morgan

   

If the maturity date or an interest payment date for any note is not a business day (as term is defined in prospectus), principal, premium, if any, and interest for that note is paid on the next business day, and no interest will accrue from, and after, the maturity date or interest payment date.

Ally Financial Inc.

Ally Financial Term Notes, Series A

Prospectus dated August 24, 2012