VANDERBRUG GORDON

• Purchase • Sale • Planned purchase • Planned sale Net purchase Net sale Activity signal Earnings

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Abbreviations B: Buy, S: Sell, PP: Planned purchase, PlS: Planned sale, PrS: Proposed sale, O: Option / Other

Notification date	Transaction date	Company	B/S Transaction type	Nb. shares Price Value	Number of shares	Price	Value
2004-05-24	2004-05-24	iBasis Inc (IBAS)	B Purchase	22,353 +40.2% 379.04 US$635,145	22,353 +40.2%	379.04	US$635,145
2004-05-24	2004-05-21	iBasis Inc (IBAS)	B Purchase	80,976 -12.6% 475.76 US$2,929,276	80,976 -12.6%	475.76	US$2,929,276
2004-05-24	2004-05-21	iBasis Inc (IBAS)	B Purchase	43,912 +45.7% 91.38 US$2,146,143	43,912 +45.7%	91.38	US$2,146,143
2004-05-24	2004-05-21	iBasis Inc (IBAS)	B Purchase	17,800 +4.2% 1.30 US$23,140	17,800 +4.2%	1.30	US$23,140
2004-05-24	2004-05-21	iBasis Inc (IBAS)	B Purchase	1,000 +0.2% 1.28 US$1,280	1,000 +0.2%	1.28	US$1,280
2004-05-24	2004-05-21	iBasis Inc (IBAS)	B Purchase	200 +0.0% 1.27 US$254	200 +0.0%	1.27	US$254