Tampax is owned by P&G. You can also boycott their other products: Always®, Ambi Pur®, Ariel®, Bounty®, Charmin®, Crest®, Dawn®, Downy®, Fairy®, Febreze®, Gain®, Gillette®, Head & Shoulders®, Lenor®, Olay®, Oral-B®, Pampers®, Pantene®, SK-II®, Tide®, Vicks®, and Whisper®."
Well there's a bonus to shopping at Aldi - the only thing I have from those people is some Vicks (I have a sainsburies one somewhere too, so I'll just skip to an own brand when it's time to refill).
Weird seeing SK-II on there - I had something of theirs ages ago, some 'special water' you were supposed to splash on your face twice a day, which was supposedly some Sake by-product. I credit that product with coming to my senses about the whole fancy face/hair product industry, when I realised the ridiculous thing I was dedicatedly doing morning and evening and expecting miracles!