Contacts:         Kimberly Allen                         Jennifer Howard-Brown
                  Investor Relations Manager             Media Relations Manager
                  (512) 683-6873                         (512) 683-8713

    National Instruments Reports All-Time Record Revenue for Quarter and Year
                      Company Declares 3-for-2 Stock Split

AUSTIN,  Texas - Jan. 21, 2004 - National  Instruments  (Nasdaq:  NATI) reported
record  fourth  quarter  revenue  of $122  million,  an  increase  of 14 percent
compared  to the fourth  quarter of 2002 and a 16 percent  sequential  increase.
This  represents  the highest  quarterly  revenue in NI history.  Fully  diluted
earnings per share (EPS) for Q4 were 21 cents with a net income of $11.2 million
up 13 percent  from Q4 2002 and up 41 percent  sequentially.  In Q4 of 2003,  NI
took a $3.8 million  charge to accrue for the expected legal costs of taking the
company's  most  recent  patent  dispute to trial in early  2005.  The after tax
impact of this charge is equivalent to 5 cents per share.

For 2003, revenue totaled $426 million,  up 9 percent from $391 million in 2002,
marking  record  annual  revenue for National  Instruments  and the 26th year of
growth in the company's 27-year history.

The company  also  announced  that the National  Instruments  Board of Directors
declared a 3-for-2 stock split and a quarterly  dividend of 5 cents per share on
the  company's  common stock  payable on Feb. 20, 2004,  to holders of record on
Feb. 5, 2004. All per-share data are presented prior to this split.

"Given our strong  profitability,  we made a strategic  decision to aggressively
increase our  investments in R&D during the economic  downturn,"  said Dr. James
Truchard,  NI CEO.  "This  strategy  clearly  paid off in 2003 with the  highest
number of new products  introduced  in the history of the company,  resulting in
the highest revenue in any year in our history."

Q4 2003 and FY 2003 Highlights

o     Record quarterly revenue for Q4 2003, up 14 percent from Q4 2002 and up 16
      percent sequentially
o     Record annual revenue for 2003 of $426 million
o     Strong investment in R&D produces record output of new products in 2003
o     NI LabVIEW 7 Express awarded prestigious honors from: Control Engineering,
      Evaluation Engineering, Design News, EDN, Industrial Automation News and
      Electronics Products
o     Strong adoption of LabVIEW 7 Express by new customers
o     Record cash and short-term investments of $195 million
o     NI named to FORTUNE magazine's 100 Best Companies to Work For list for
      fifth consecutive year

"We are pleased to once again announce  quarterly and annual records with fourth
quarter  revenue  up 16  percent  sequentially  and  net  income  up 41  percent
sequentially," said Alex Davern, NI CFO. "With continued strong annual cash flow
from  operations  of $63  million,  we have  increased  our cash and short  term
investments to a record of $195 million and have  demonstrated  the  outstanding
operating leverage in our business."

Geographically,  the  growth  of  revenue  in U.S.  dollar  terms for Q4 2003 as
compared to Q4 2002 was as follows: up 10 percent in the Americas, up 15 percent
in Europe and up 22 percent in Asia  giving  overall  growth of 14  percent.  In
local currency terms, revenue was up 3 percent in Europe and 30 percent in Asia,
for an overall growth of 11 percent.

For Q1 2004,  NI  currently  expects  revenue to  increase by  approximately  20
percent year-over-year and estimates fully diluted earnings per share will be in
the  range of 21 to 25 cents  per  share,  compared  to 13 cents per share in Q1
2003. All per-share data are presented prior to the stock split.

Interested  parties  can listen to a  conference  call  today,  Jan.  21,  2004,
beginning at 4:00 p.m. CDT, at ni.com/call. Replay information will be available
by calling (719) 457-0820, confirmation code #711190, from Jan. 21, 2004 at 7:00
p.m. CDT, through Jan. 28, 2004 at 12:00 a.m. CDT.

This release contains "forward-looking  statements," including R&D investment as
a driver for growth,  potential  future  operating  leverage,  and the company's
expectations  regarding  record  revenue  for the year,  revenue  growth for the
quarter, and estimated earnings for the quarter. These statements are subject to
a number of risks and  uncertainties,  including the risk of adverse  changes in
the global  economy,  delays in the  release of new  products,  fluctuations  in
customer  demand for NI  products,  manufacturing  inefficiencies,  and  foreign
exchange  fluctuations.  Actual results may differ  materially from the expected
results. The company directs you to documents filed with the SEC for other risks
associated with the company's future performance.


                                    - More -





About National Instruments

National Instruments  (www.ni.com) is a technology pioneer and leader in virtual
instrumentation - a revolutionary concept that has changed the way engineers and
scientists  approach  measurement  and  automation.  Leveraging  the PC and  its
related technologies,  virtual instrumentation increases productivity and lowers
costs for customers worldwide through easy-to-integrate software, such as the NI
LabVIEW graphical  development  environment,  and modular hardware,  such as PXI
modules  for  data   acquisition,   instrument   control  and  machine   vision.
Headquartered  in Austin,  Texas,  NI has more than 3,000  employees  and direct
operations  in 40  countries.  In 2003,  the company sold  products to more than
25,000  different  companies in more than 80 countries around the world. For the
past five consecutive  years,  FORTUNE magazine has named NI one of the 100 best
companies to work for in America.

Readers may obtain investment  information from the company's investor relations
department at (512) 683-5090,  by sending e-mail to nati@ni.com or on the Web at
www.ni.com/nati.

The condensed  consolidated balance sheets,  statements of income and cash flows
to follow.

LabVIEW, NI and ni.com are trademarks of National Instruments. Other product and
company  names  listed  are  trademarks  or  trade  names  of  their  respective
companies.

                                    - More -





                              National Instruments
                      Condensed Consolidated Balance Sheets
                                 (in thousands)


                                              December 31,  December 31,
                                                  2003          2002
                                              ------------  ------------
                                              (unaudited)
ASSETS
Current assets:
  Cash and cash equivalents                   $    53,446   $    40,240
  Short-term investments                          141,227       113,638
  Accounts receivable, net                         77,970        62,981
  Inventories                                      38,813        39,247
  Other current assets                             19,669        21,860
                                              ------------  ------------
    Total current assets                          331,125       277,966

Property and equipment, net                       151,612       152,133
Intangibles and other assets                       42,414        28,615
                                              ------------  ------------
Total assets                                  $   525,151   $   458,714
                                              ============  ============
LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities:
  Accounts payable                            $    29,567   $    25,578
  Accrued expenses                                 46,228        40,935
                                              ------------  ------------
    Total current liabilities                      75,795        66,513

Deferred income taxes                               9,904         5,738
                                              ------------  ------------
    Total liabilities                              85,699        72,251
                                              ------------  ------------
Stockholders' equity:
  Common stock                                        522           511
  Additional paid-in capital                       95,331        72,063
  Retained earnings                               349,994       321,813
  Accumulated other comprehensive loss             (6,395)       (7,924)
                                              ------------  ------------
    Total stockholders' equity                    439,452       386,463
                                              ------------  ------------
    Total liabilities and stockholders'
    equity                                    $   525,151   $   458,714
                                              ============  ============

                                    - More -



                              National Instruments
                   Condensed Consolidated Statements of Income
                      (in thousands, except per share data)




                                     Three Months                     Year Ended
                                  Ended December 31,              Ended December 31,
                                     (unaudited)                     (unaudited)
                             -----------------------------   -----------------------------
                                                  Percent                         Percent
                               2003      2002    Inc/(Dec)     2003      2002    Inc/(Dec)
                             --------  --------  ---------   --------  --------  ---------
                                                               
Net sales                    $121,910  $106,525     14%      $425,892  $390,790      9%
Cost of sales                  31,074    27,928     11%       111,672   105,086      6%
                             --------  --------              --------  --------
Gross profit                   90,836    78,597     16%       314,220   285,704     10%
                             --------  --------              --------  --------

Operating expenses:
Sales and marketing            43,528    40,018      9%       160,478   145,671     10%
Research and development       20,398    16,201     26%        70,896    63,964     11%
General and administrative      9,314     8,453     10%        34,543    31,011     11%
Patent litigation               4,143     1,190    248%         7,954     4,703     69%
                             --------  --------              --------  --------
  Total operating expenses     77,383    65,862     17%       273,871   245,349     12%
                             --------  --------              --------  --------

Operating income               13,453    12,735      6%        40,349    40,355     --

Interest income, net              573       748    (23%)        2,449     3,167    (23%)
Net foreign exchange
  gain (loss)                   1,008       565     78%         1,125      (724)   255%
Other income expense              (37)     (208)    82%           568       820    (31%)
                             --------  --------              --------  --------

Income before income taxes     14,997    13,840      8%        44,491    43,618      2%
Provision for income taxes      3,749     3,875     (3%)       11,123    12,213     (9%)
                             --------  --------              --------  --------

Net income                   $ 11,248  $  9,965     13%      $ 33,368  $ 31,405      6%
                             ========  ========              ========  ========

Basic earnings per share     $   0.22  $   0.20     10%      $   0.65  $   0.61      7%
                             ========  ========              ========  ========

Diluted earnings per share   $   0.21  $   0.19     11%      $   0.62  $   0.59      5%
                             ========  ========              ========  ========

Dividends per share          $   0.05  $     --     N/A      $   0.10  $     --     N/A
                             ========  ========              ========  ========
Weighted average shares
  outstanding--basic           51,869    51,013      2%        51,625    51,219      1%
                             ========  ========              ========  ========
Weighted average shares
  outstanding--diluted         54,408    52,875      3%        53,964    53,411      1%
                             ========  ========              ========  ========



                                    - More -



                              National Instruments
                      Consolidated Statements of Cash Flows
                                 (in thousands)


                                                                Year Ended
                                                                December 31,
                                                                (unaudited)
                                                             2003        2002
                                                          ----------  ----------
Cash flow from operating activities:
   Net income                                             $  33,368   $  31,405
   Adjustments to reconcile net income to cash provided
   by operating activities:
      Charges to income not requiring cash outlays:
        Depreciation and amortization                        24,774      20,748
        Provision (benefit) for deferred income taxes         2,329        (207)
        Tax benefit from stock option plans                   3,849       1,835
      Changes in operating assets and liabilities:
        Increase in accounts receivable                     (14,989)     (9,357)
        Decrease (increase) in inventory                        434      (6,640)
        Decrease in prepaid expense and other assets          4,049       1,823
        Increase in current liabilities                       9,282       9,526
                                                          ----------  ----------
   Net cash provided by operating activities                 63,096      49,133
                                                          ----------  ----------

Cash flow from investing activities:
Payments for acquisitions, net of cash received              (6,324)         --
Capital expenditures                                        (17,983)    (30,817)
Capitalization of internally developed software              (9,717)     (5,757)
Additions to intangibles                                     (2,520)     (2,993)
Purchases of short-term investments                        (143,991)   (134,434)
Sales/maturities of short-term investments                  116,402     122,218
                                                          ----------  ----------
   Net cash used in investing activities                    (64,133)    (51,783)
                                                          ----------  ----------

Cash flow from financing activities:
Proceeds from issuance of common stock                       19,430      13,424
Repurchase of common stock                                       --     (19,623)
Dividends paid                                               (5,187)         --
                                                          ----------  ----------
   Net cash provided by (used in) financing activities       14,243      (6,199)
                                                          ----------  ----------

Net increase (decrease) in cash and cash equivalents         13,206      (8,849)
Cash and cash equivalents at beginning of period             40,240      49,089
                                                          ----------  ----------
Cash and cash equivalents at end of period                $  53,446   $  40,240