In case anyone encounters the same problem: one can edit the cost basis of 
transferred positions:

https://www.interactivebrokers.com/en/software/am/am/reports/positiontransferbasis.htm

-- 
Zhuoyun Wei

On Thu, May 2, 2019, at 01:39, Zhuoyun Wei wrote:
> I just run a custom report. Indeed the lot information is lost. The 
> purchase date and cost basis are both wrong. I'll contact IB custom 
> support to fix that...
> 
> -- 
> Zhuoyun Wei
> 
> On Wed, May 1, 2019, at 22:06, Justus Pendleton wrote:
> > On Thursday, May 2, 2019 at 12:48:34 AM UTC+7, Zhuoyun Wei wrote:
> > > One thing surprises me is that the receiving broker (InteractiveBrokers, 
> > > to be exact) does not preserve the cost basis. In its PDF statement and 
> > > the TWS, the cost basis of the inbound positions is the price when IBKR 
> > > receives the positions. It's my first time doing ACATS, so I have no idea 
> > > if this is a normal thing. 
> > 
> > I have done an ACATS to Interactive Brokers and it preserved my cost 
> > basis & the date of acquisition.
> > 
> > I would double check that the cost basis is actually gone. IB makes 
> > this surprisingly hard to verify. You need to create a custom report to 
> > see lots. Go to Statements, click the gear icon in Custom Statements on 
> > the right, click the + to create a new statement, and select "Open 
> > Positions" in the Sections. Then run that report and you can see all of 
> > your lots, with their date of acquisition and cost basis.
> > 
> > If it is wrong, I'd contact IB support and tell them to fix it. From 
> > what I gather, brokers are generally happy to put whatever you tell 
> > them in the cost basis data. After all, if it is wrong, they don't get 
> > in trouble with the tax authorities....you do.
> > 
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