BRIEF-Ultra Electronics confirms discussions to buy Sparton Corp
* Confirm in advanced discussions to buy whole of issued share capital of New York Stock Exchange listed Sparton Corporation
April 13 Tocagen Inc
* Tocagen Inc shares open at $10.27, above IPO price of $10.00 per share Further company coverage:
LONDON, June 26 L1 Retail has agreed to buy Holland & Barrett from The Nature's Bounty Co. and The Carlyle Group for 1.77 billion pounds ($2.26 billion), the companies said in a statement.