UNITED STATES              ----------------------------
             SECURITIES AND EXCHANGE COMMISSION   |        OMB APPROVAL        |
                  Washington, DC 20549            |----------------------------|
                                                  |OMB Number:    3235-0059    |
                                                  |Expires:    January 21, 2008|
                                                  |Estimated average burden    |
                                                  |hours per response.....14.00|
                                                   ----------------------------

                                  SCHEDULE 14A

           Proxy Statement Pursuant to Section 14(a) of the Securities
                      Exchange Act of 1934 (Amendment No. )


Filed by the Registrant  [X]
Filed by a Party other than the Registrant  [   ]

Check the appropriate box:

[ ]  Preliminary Proxy Statement
[ ]  Confidential, for Use of the Commission Only
     (as permitted by Rule 14a-6(e)(2))
[ ]  Definitive Proxy Statement
[ ]  Definitive Additional Materials
[X]  Soliciting Material Pursuant to Sec. 240.14a-11(c) or Sec. 240.14a-12


                          BARON INVESTMENT FUNDS TRUST
                            (f/k/a Baron Asset Fund)
- --------------------------------------------------------------------------------
                (Name of Registrant as Specified In Its Charter)

- --------------------------------------------------------------------------------
    (Name of Person(s) Filing Proxy Statement if other than the Registrant)

Payment of Filing Fee (Check the appropriate box):

[X]  No fee required.

[ ]  Fee computed on table below per Exchange Act Rules 14a-6(i)(1) and 0-11.

     1)   Title of each class of securities to which transaction applies:

- --------------------------------------------------------------------------------
     2)   Aggregate number of securities to which transaction applies:

- --------------------------------------------------------------------------------
     3)   Per unit price or other underlying value of transaction computed
          pursuant to Exchange Act Rule 0-11 (Set forth the amount on which
          the filing fee is calculated and state how it was determined):

- --------------------------------------------------------------------------------
     4)   Proposed maximum aggregate value of transaction:

- --------------------------------------------------------------------------------
     5)   Total fee paid:

- --------------------------------------------------------------------------------

               Persons who are to respond to the collection of information
               contained in this form are not required to respond unless the
               form displays a currently valid OMB control number.

SEC 1913 (04-05)


[ ]  Fee paid previously with preliminary materials.

[ ]  Check box if any part of the is offset as provided  by Exchange  Act Rule
     0-11(a)(2)  and identify the filing for which the  offsetting  fee was paid
     previously.  Identify the previous filing by registration statement number,
     or the Form or Schedule and the date of its filing.

     1)   Amount Previously Paid:

- --------------------------------------------------------------------------------
     2)   Form, Schedule or Registration Statement No.:

- --------------------------------------------------------------------------------
     3)   Filing Party:

- --------------------------------------------------------------------------------
     4)   Date Filed:

- --------------------------------------------------------------------------------




                                BARON ASSET FUND

                   NOTICE OF ADJOURNMENT OF SPECIAL MEETING OF
                                  SHAREHOLDERS


  To Our Shareholders:

Please take notice that the Special Meeting of  Shareholders  (the "Meeting") of
Baron Asset Fund (the  "Fund"),  which was  scheduled to take place at the Loews
Regency Hotel, 540 Park Avenue (at 61st Street), New York, NY 10021, on December
5, 2006, at 11 a.m. eastern time is being adjourned to January 12, 2007.

As  described  in the proxy  statement  filed with the  Securities  and Exchange
Commission on October 12, 2006 (the "Proxy Statement"),  the shareholders of the
Fund  will be asked to  consider  and  vote as a single  class on the  following
proposal:

     (1)  To approve or disapprove a change to the investment goal of the Fund.

The  shareholders  of the Fund will be asked to consider and vote  separately on
the following proposal, which is described in the Proxy Statement:

     (2)  To  transact  such other  business  as may  properly  come  before the
          Special Meeting of Shareholders or any adjournment thereof.

THE BOARD OF TRUSTEES  UNANIMOUSLY  RECOMMENDS THAT  SHAREHOLDERS VOTE "FOR" THE
PROPOSAL TO CHANGE THE FUND'S  INVESTMENT GOAL TO PROVIDE  CAPITAL  APPRECIATION
THROUGH  INVESTMENTS   PRIMARILY  IN  THE  SECURITIES  OF  MEDIUM  SIZED  GROWTH
COMPANIES.  THE BOARD BELIEVES THIS CHANGE WILL BENEFIT THE FUND'S  SHAREHOLDERS
AS IT WILL ALLOW THE ADVISER TO BETTER  DISTINGUISH  THE FUND FROM BARON  FUNDS'
TWO SMALL-CAP GROWTH FUNDS. IN ADDITION, THIS CHANGE WILL ALLOW THE FUND TO TAKE
ADVANTAGE OF BARON FUNDS'  INSTITUTIONAL  KNOWLEDGE OF THE MANY SUCCESSFUL SMALL
GROWTH  COMPANIES  WHICH HAVE BECOME  MID-SIZED  GROWTH  COMPANIES AND WHICH THE
ADVISER BELIEVES HAVE SIGNIFICANT GROWTH PROSPECTS.

WE GREATLY APPRECIATE YOUR PROMPT ATTENTION TO THIS MATTER AND ASK THAT YOU VOTE
- --------------------------------------------------------------------------------
YOUR  SHARES AS SOON AS  POSSIBLE  SO THAT THE  PROPOSAL IS APPROVED IN A TIMELY
- --------------------------------------------------------------------------------
MANNER AND FURTHER COSTS CAN BE KEPT TO A MINIMUM.
- --------------------------------------------------

YOU CAN VOTE YOUR SHARES BY PROXY BY:
- --------------------------------------------------------------------------------
| 1. TO SPEAK  TO  A  PROXY  VOTING  SPECIALIST:  Dial  1-888-684-2446  and  a |
|    ------------------------------------------          --------------        |
|    representative from MIS, an ADP company (the Fund's proxy  solicitor) will|
|    assist you with voting  your  shares and answer any of your proxy related |
|    questions.  SPECIALISTS AVAILABLE  MON FRI: 9:30 A.M. TO 9:00 P.M.,  SAT: |
|    10:00 A.M. TO 6:00 P.M.                                                   |
- --------------------------------------------------------------------------------



- --------------------------------------------------------------------------------
| 2. VOTE BY TOUCH-TONE: Dial the TOLL-FREE touch-tone voting number listed on |
|    ------------------                                                        |
|    your proxy  card, enter the  CONTROL  NUMBER  printed  your proxy card and|
|    follow the simple instructions. Telephone  voting is available 24 hours a |
|    day, 7 days a week.                                                       |
| 3. VOTE VIA INTERNET:  Go to  website  listed on your proxy  card, enter the |
|    -----------------                                                         |
|    CONTROL  NUMBER  printed  on  your  proxy  card  and  follow  the  simple |
|    instructions.                                                             |
| 4. VOTE BY MAIL:Sign and Date the enclosed proxy card and mail back using the|
|    ------------                                                              |
|    enclosed pre-paid postage envelope.                                       |
- --------------------------------------------------------------------------------


                                By order of the Board of Trustees

                                /s/ Linda S. Martinson
                                ----------------------
                                    Linda S. Martinson
                                    Secretary


                             ADP SOLICITATION SCRIPT
                             -----------------------



"Hi, my name is --------------------  and this is a courtesy call from ADP. I am
a proxy  representative  on behalf of Baron Asset Funds. Is  (shareholder  name)
available?"

WHEN CORRECT SHAREHOLDER COMES ON THE LINE:

     "Hi Mr./Ms. ---------------------, my name is ------------ and I am calling
     from ADP  because  you are a  shareholder  of Baron Asset Fund and for your
     protection  this  call is being  recorded.  Although  you may not have been
     called in the past, Baron has chosen ADP to assist with the solicitation of
     votes for the  upcoming  special  meeting  of  Shareholders  which has been
     adjourned to January 12, 2007. Have you received this material?"

IF THE SHAREHOLDER ANSWERS:

     "Hi Mr./Ms.  -------------------,  I am calling  from ADP because you are a
     shareholder of Baron Asset Funds and for your protection this call is being
     recorded.  Although  you may not have been  called  in the past,  Baron has
     chosen  ADP to  assist  with the  solicitation  of votes  for the  upcoming
     special  meeting of  Shareholders  which has been  adjourned to January 12,
     2007. Have you received this material?"

IF NOT RECEIVED:

[VERIFY ADDRESS AND MAKE ANY CHANGES.]

     "I can either email or resend the voting material to you. If you would like
     we can  schedule a call back for a later date.  Also,  you may call us back
     after  receiving the materials with any questions or to cast your vote over
     the phone. The phone number is 1- 888-684-2446."

IF YES (regarding emailing):

     "Excellent, may I have your email address please?"

[AFTER  THE  SHAREHOLDER  TELLS YOU THEIR  EMAIL  ADDRESS,  READ IT BACK TO THEM
PHONETICALLY AND VERIFY IF IT IS CASE SENSITIVE.]

     "Thank you Mr./Ms. --------------------.  I will have that email out to you
     within one  business  day and please be aware that the email is coming from
     ADP Proxy Services.  Our phone number will be in that email for you to call
     back and vote your shares, as well as answer any questions you may have."

IF YES (regarding re-mailing):

     "The new package will be mailed out to you.  Mr./Ms.  --------------  would
     you like me to  schedule  a call back after you have had a chance to review
     the material? Thank you for your time and have a great day/evening."

IF NO (regarding emailing or re-mailing):

     "You may  automatically  receive  another  mailing  because of your unvoted
     shares. Please be aware that as a shareholder,  your vote is important.  If
     you receive another mailing you are welcome to vote by internet,  touchtone
     phone or by mail. The only thing you will need is the control number, which
     is the shaded number on your proxy card."

IF RECEIVED:

     "Have you had a chance to review the material and are there any questions I
     can answer for you?"

     "If  you  have  no  (further)  questions,  would  you  like  to  take  this
     opportunity to place your vote with me over the phone?"

IF SHARES WERE SOLD AFTER RECORD DATE:

     "Since you were a shareholder  on the date of record,  which was October 6,
     2006, you are still entitled to cast your vote. If you would like, I can go
     over the proxy material with you now and assist you in placing your vote."

IF YES (to placing their vote):

     "The process will only take a few moments.

          1.   I will introduce myself again and give the date and time.

          2.   I will then ask your permission to record your vote.

          3.   At that  point,  I will  need you to  verify  your  full name and
               mailing address.

     My name is ----------------------  from ADP on behalf of Baron Asset Funds.
     Today's date is ---------------- and the time is -------- E.T.

     May I take your vote now?

     May I please  confirm you have received the material and are  authorized to
     vote on this/these account(s)?

     For the  record,  would you please  state  your full name and full  mailing
     address?

     THE BOARD OF TRUSTEES HAS UNANIMOUSLY APPROVED THE PROPOSAL(S) AS SET FORTH
     IN THE MATERIAL YOU RECEIVED AND RECOMMENDS A FAVORABLE VOTE FOR THIS/THESE
     PROPOSAL(S).  DO YOU WISH TO SUPPORT THE BOARD'S RECOMMENDATION FOR EACH OF
     YOUR ACCOUNTS?"

FOR FAVORABLE VOTE:

     "Mr./Ms.  ---------------- I have recorded your vote as follows, for all of
     your Baron Asset Funds  accounts you are voting the Board's  recommendation
     in  favor  of the  proposal(s)  as set  forth in the  proxy  materials  you
     received, is that correct?"



FOR NON-FAVORABLE VOTE:

     "Mr./Ms.------------  I have recorded your vote as follows, for all of your
     Baron Asset Funds  accounts you are voting  against the  proposal(s) as set
     forth in the proxy materials you received, is that correct?"

FOR ABSTENTIONS:

     "Mr./Ms.  --------------  I have recorded your vote as follows,  for all of
     your Baron Asset Funds  accounts you are  abstaining on the  proposal(s) as
     set forth in the proxy materials you received, is that correct?"

[RECORD ALL VOTES AS  SHAREHOLDER  REQUESTS  AND  CONFIRM BY READING  BACK THEIR
CHOICES.]

     "Within the next 72 hours we will mail you a written  confirmation  of your
     vote. If we have not recorded your information  correctly or if you wish to
     change your vote,  please call  1-888-684-2446 to let us know. Also, please
     be aware that your vote cannot be changed with us by phone after 9:00pm ET,
     December  4, 2006.  Thank you very much for your  participation  and have a
     great day/evening."

IF NOT INTERESTED (IN VOTING):

     "Please be aware that as a  shareholder,  your vote is  important.  You are
     welcome to vote by internet, touchtone phone or by mail. The only thing you
     will need is the control  number,  which is the shaded number on your proxy
     card.   Thank  you  again  for  your  time  today,  and  have  a  wonderful
     day/evening."

IF YES (to scheduling a call back):

     "Thank  you very  much  Sir/Madame,  we will  give you a call  back at your
     convenience  on at ----  o'clock  your time.  Should  you have any  further
     questions  prior  to  our  call  back,  please  feel  free  to  call  us at
     1-888-684-2446. Thank you for your time and have a great day/evening."

IF NO (regarding call-back):

     "We  would  like  to  ensure  you,  that  as a  shareholder,  your  vote is
     important. You are welcome to vote by internet, touchtone phone or by mail.
     The only  thing you will need is the  control  number,  which is the shaded
     number on your proxy card.  Or if you would like to vote by phone,  you may
     do so by calling us back at  1-888-684-2446.  Thank you again for your time
     today, and have a wonderful day/evening."




                           ANSWERING MACHINE MESSAGE:

     "Hello, this message is for -------------- my name is  --------------------
     and I am a proxy  representative  for ADP on behalf of Baron  Asset  Funds,
     with which you are a shareholder.  Although you may not have been called in
     the past, Baron has chosen ADP to assist with the solicitation of votes for
     the upcoming  special meeting of  Shareholders  which has been adjourned to
     January 12, 2007.  You should have  received  material in the mail recently
     concerning this Special meeting of Shareholders.

     Your vote is very  important.  You can provide your vote quickly and easily
     by  touchtone  phone,  Internet or by mail.  You may call also call us toll
     free at 1-888-  684-2446  to cast your vote  directly  over the phone or to
     answer any questions you may have.

     Your prompt response will ensure that enough shareholder participation will
     be present at the  meeting.  THE BOARD OF TRUSTEES OF THE FUND  UNANIMOUSLY
     RECOMMENDS  THAT YOU VOTE IN FAVOR OF THE  PROPOSALS.  Thank you and have a
     great day/evening."