<?xml version="1.0" encoding="UTF-8"?>
<!-- Created by FilePoint's XBRLinator v.1.0i * www.edgarfilepoint.com * -->
<link:linkbase xmlns:sheltonfunds="http://sheltonfunds/20120101"
xmlns:link="http://www.xbrl.org/2003/linkbase"
xmlns:us-types="http://xbrl.us/us-types/2009-01-31"
xmlns:xbrldt="http://xbrl.org/2005/xbrldt"
xmlns:rr="http://xbrl.sec.gov/rr/2010-02-28"
xmlns:dei="http://xbrl.us/dei/2009-01-31"
xmlns:xbrldi="http://xbrl.org/2006/xbrldi"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:xbrli="http://www.xbrl.org/2003/instance"
xmlns:iso4217="http://www.xbrl.org/2003/iso4217"
xmlns:xlink="http://www.w3.org/1999/xlink"
xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
<link:roleRef roleURI="http://xbrl.sec.gov/rr/role/Series" xlink:type="simple"
xlink:href="http://xbrl.sec.gov/rr/2010/rr-2010-02-28.xsd#SeriesOnly"/>
<link:roleRef roleURI="http://xbrl.sec.gov/rr/role/Class" xlink:type="simple"
xlink:href="http://xbrl.sec.gov/rr/2010/rr-2010-02-28.xsd#ClassOnly"/>
<link:roleRef roleURI="http://xbrl.sec.gov/rr/role/PerformanceMeasure" xlink:type="simple"
xlink:href="http://xbrl.sec.gov/rr/2010/rr-2010-02-28.xsd#PerformanceMeasureOnly"/>
<link:roleRef roleURI="http://xbrl.sec.gov/rr/role/Prospectus" xlink:type="simple"
xlink:href="http://xbrl.sec.gov/rr/2010/rr-2010-02-28.xsd#ProspectusOnly"/>
<link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member" xlink:type="simple"
xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member"/>
<link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/all" xlink:type="simple"
xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all"/>
<link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:type="simple"
xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain"/>
<link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:type="simple"
xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension"/>
<link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:type="simple"
xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default"/>
<link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/rr/role/Series">
<link:loc xlink:type="locator"
xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/non-gaap/dei-2009-01-31.xsd#dei_EntityDomain"
xlink:label="EntityDomain"/>
<link:loc xlink:type="locator" xlink:href="sheltonfunds-20120101.xsd#sheltonfunds_S000011273Member"
xlink:label="S000011273Member"/>
<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
xlink:from="EntityDomain"
xlink:to="S000011273Member"
order="1.0"/>
</link:definitionLink>
<link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/rr/role/Series">
<link:loc xlink:type="locator"
xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/non-gaap/dei-2009-01-31.xsd#dei_EntityDomain"
xlink:label="EntityDomain"/>
<link:loc xlink:type="locator" xlink:href="sheltonfunds-20120101.xsd#sheltonfunds_S000011274Member"
xlink:label="S000011274Member"/>
<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
xlink:from="EntityDomain"
xlink:to="S000011274Member"
order="2.0"/>
</link:definitionLink>
<link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/rr/role/Series">
<link:loc xlink:type="locator"
xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/non-gaap/dei-2009-01-31.xsd#dei_EntityDomain"
xlink:label="EntityDomain"/>
<link:loc xlink:type="locator" xlink:href="sheltonfunds-20120101.xsd#sheltonfunds_S000011275Member"
xlink:label="S000011275Member"/>
<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
xlink:from="EntityDomain"
xlink:to="S000011275Member"
order="3.0"/>
</link:definitionLink>
<link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/rr/role/Series">
<link:loc xlink:type="locator"
xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/non-gaap/dei-2009-01-31.xsd#dei_EntityDomain"
xlink:label="EntityDomain"/>
<link:loc xlink:type="locator" xlink:href="sheltonfunds-20120101.xsd#sheltonfunds_S000016022Member"
xlink:label="S000016022Member"/>
<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
xlink:from="EntityDomain"
xlink:to="S000016022Member"
order="4.0"/>
</link:definitionLink>
<link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/rr/role/Series">
<link:loc xlink:type="locator"
xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/non-gaap/dei-2009-01-31.xsd#dei_EntityDomain"
xlink:label="EntityDomain"/>
<link:loc xlink:type="locator" xlink:href="sheltonfunds-20120101.xsd#sheltonfunds_S000016023Member"
xlink:label="S000016023Member"/>
<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
xlink:from="EntityDomain"
xlink:to="S000016023Member"
order="5.0"/>
</link:definitionLink>
<link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/rr/role/Series">
<link:loc xlink:type="locator"
xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/non-gaap/dei-2009-01-31.xsd#dei_EntityDomain"
xlink:label="EntityDomain"/>
<link:loc xlink:type="locator" xlink:href="sheltonfunds-20120101.xsd#sheltonfunds_S000016024Member"
xlink:label="S000016024Member"/>
<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
xlink:from="EntityDomain"
xlink:to="S000016024Member"
order="6.0"/>
</link:definitionLink>
<link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/rr/role/Series">
<link:loc xlink:type="locator"
xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/non-gaap/dei-2009-01-31.xsd#dei_EntityDomain"
xlink:label="EntityDomain"/>
<link:loc xlink:type="locator" xlink:href="sheltonfunds-20120101.xsd#sheltonfunds_S000016025Member"
xlink:label="S000016025Member"/>
<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
xlink:from="EntityDomain"
xlink:to="S000016025Member"
order="7.0"/>
</link:definitionLink>
<link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/rr/role/Series">
<link:loc xlink:type="locator"
xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/non-gaap/dei-2009-01-31.xsd#dei_EntityDomain"
xlink:label="EntityDomain"/>
<link:loc xlink:type="locator" xlink:href="sheltonfunds-20120101.xsd#sheltonfunds_S000016026Member"
xlink:label="S000016026Member"/>
<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
xlink:from="EntityDomain"
xlink:to="S000016026Member"
order="8.0"/>
</link:definitionLink>
<link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/rr/role/Series">
<link:loc xlink:type="locator"
xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/non-gaap/dei-2009-01-31.xsd#dei_EntityDomain"
xlink:label="EntityDomain"/>
<link:loc xlink:type="locator" xlink:href="sheltonfunds-20120101.xsd#sheltonfunds_S000016027Member"
xlink:label="S000016027Member"/>
<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
xlink:from="EntityDomain"
xlink:to="S000016027Member"
order="9.0"/>
</link:definitionLink>
<link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/rr/role/Series">
<link:loc xlink:type="locator"
xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/non-gaap/dei-2009-01-31.xsd#dei_EntityDomain"
xlink:label="EntityDomain"/>
<link:loc xlink:type="locator" xlink:href="sheltonfunds-20120101.xsd#sheltonfunds_S000016028Member"
xlink:label="S000016028Member"/>
<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
xlink:from="EntityDomain"
xlink:to="S000016028Member"
order="10.0"/>
</link:definitionLink>
<link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/rr/role/Series">
<link:loc xlink:type="locator"
xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/non-gaap/dei-2009-01-31.xsd#dei_EntityDomain"
xlink:label="EntityDomain"/>
<link:loc xlink:type="locator" xlink:href="sheltonfunds-20120101.xsd#sheltonfunds_S000016029Member"
xlink:label="S000016029Member"/>
<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
xlink:from="EntityDomain"
xlink:to="S000016029Member"
order="11.0"/>
</link:definitionLink>
<link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/rr/role/Series">
<link:loc xlink:type="locator"
xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/non-gaap/dei-2009-01-31.xsd#dei_EntityDomain"
xlink:label="EntityDomain"/>
<link:loc xlink:type="locator" xlink:href="sheltonfunds-20120101.xsd#sheltonfunds_S000016030Member"
xlink:label="S000016030Member"/>
<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
xlink:from="EntityDomain"
xlink:to="S000016030Member"
order="12.0"/>
</link:definitionLink>
<link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/rr/role/Series">
<link:loc xlink:type="locator"
xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/non-gaap/dei-2009-01-31.xsd#dei_EntityDomain"
xlink:label="EntityDomain"/>
<link:loc xlink:type="locator" xlink:href="sheltonfunds-20120101.xsd#sheltonfunds_SK00016022Member"
xlink:label="SK00016022Member"/>
<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
xlink:from="EntityDomain"
xlink:to="SK00016022Member"
order="13.0"/>
</link:definitionLink>
<link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/rr/role/Series">
<link:loc xlink:type="locator"
xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/non-gaap/dei-2009-01-31.xsd#dei_EntityDomain"
xlink:label="EntityDomain"/>
<link:loc xlink:type="locator" xlink:href="sheltonfunds-20120101.xsd#sheltonfunds_SK00016023Member"
xlink:label="SK00016023Member"/>
<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
xlink:from="EntityDomain"
xlink:to="SK00016023Member"
order="14.0"/>
</link:definitionLink>
<link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/rr/role/Series">
<link:loc xlink:type="locator"
xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/non-gaap/dei-2009-01-31.xsd#dei_EntityDomain"
xlink:label="EntityDomain"/>
<link:loc xlink:type="locator" xlink:href="sheltonfunds-20120101.xsd#sheltonfunds_SK00016024Member"
xlink:label="SK00016024Member"/>
<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
xlink:from="EntityDomain"
xlink:to="SK00016024Member"
order="15.0"/>
</link:definitionLink>
<link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/rr/role/Series">
<link:loc xlink:type="locator"
xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/non-gaap/dei-2009-01-31.xsd#dei_EntityDomain"
xlink:label="EntityDomain"/>
<link:loc xlink:type="locator" xlink:href="sheltonfunds-20120101.xsd#sheltonfunds_SK00016025Member"
xlink:label="SK00016025Member"/>
<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
xlink:from="EntityDomain"
xlink:to="SK00016025Member"
order="16.0"/>
</link:definitionLink>
<link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/rr/role/Series">
<link:loc xlink:type="locator"
xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/non-gaap/dei-2009-01-31.xsd#dei_EntityDomain"
xlink:label="EntityDomain"/>
<link:loc xlink:type="locator" xlink:href="sheltonfunds-20120101.xsd#sheltonfunds_SK00016026Member"
xlink:label="SK00016026Member"/>
<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
xlink:from="EntityDomain"
xlink:to="SK00016026Member"
order="17.0"/>
</link:definitionLink>
<link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/rr/role/Series">
<link:loc xlink:type="locator"
xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/non-gaap/dei-2009-01-31.xsd#dei_EntityDomain"
xlink:label="EntityDomain"/>
<link:loc xlink:type="locator" xlink:href="sheltonfunds-20120101.xsd#sheltonfunds_SK00016027Member"
xlink:label="SK00016027Member"/>
<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
xlink:from="EntityDomain"
xlink:to="SK00016027Member"
order="18.0"/>
</link:definitionLink>
<link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/rr/role/Series">
<link:loc xlink:type="locator"
xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/non-gaap/dei-2009-01-31.xsd#dei_EntityDomain"
xlink:label="EntityDomain"/>
<link:loc xlink:type="locator" xlink:href="sheltonfunds-20120101.xsd#sheltonfunds_SK00016028Member"
xlink:label="SK00016028Member"/>
<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
xlink:from="EntityDomain"
xlink:to="SK00016028Member"
order="19.0"/>
</link:definitionLink>
<link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/rr/role/Series">
<link:loc xlink:type="locator"
xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/non-gaap/dei-2009-01-31.xsd#dei_EntityDomain"
xlink:label="EntityDomain"/>
<link:loc xlink:type="locator" xlink:href="sheltonfunds-20120101.xsd#sheltonfunds_SK00016029Member"
xlink:label="SK00016029Member"/>
<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
xlink:from="EntityDomain"
xlink:to="SK00016029Member"
order="20.0"/>
</link:definitionLink>
<link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/rr/role/Series">
<link:loc xlink:type="locator"
xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/non-gaap/dei-2009-01-31.xsd#dei_EntityDomain"
xlink:label="EntityDomain"/>
<link:loc xlink:type="locator" xlink:href="sheltonfunds-20120101.xsd#sheltonfunds_SK00016030Member"
xlink:label="SK00016030Member"/>
<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
xlink:from="EntityDomain"
xlink:to="SK00016030Member"
order="21.0"/>
</link:definitionLink>
<link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/rr/role/Series">
<link:loc xlink:type="locator"
xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/non-gaap/dei-2009-01-31.xsd#dei_EntityDomain"
xlink:label="EntityDomain"/>
<link:loc xlink:type="locator" xlink:href="sheltonfunds-20120101.xsd#sheltonfunds_SA00016025Member"
xlink:label="SA00016025Member"/>
<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
xlink:from="EntityDomain"
xlink:to="SA00016025Member"
order="22.0"/>
</link:definitionLink>
<link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/rr/role/Series">
<link:loc xlink:type="locator"
xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/non-gaap/dei-2009-01-31.xsd#dei_EntityDomain"
xlink:label="EntityDomain"/>
<link:loc xlink:type="locator" xlink:href="sheltonfunds-20120101.xsd#sheltonfunds_SA00016028Member"
xlink:label="SA00016028Member"/>
<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
xlink:from="EntityDomain"
xlink:to="SA00016028Member"
order="23.0"/>
</link:definitionLink>
<link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/rr/role/Class">
<link:loc xlink:type="locator"
xlink:href="http://xbrl.sec.gov/rr/2010/rr-2010-02-28.xsd#rr_ShareClassDomain"
xlink:label="ShareClassDomain"/>
<link:loc xlink:type="locator" xlink:href="sheltonfunds-20120101.xsd#sheltonfunds_C000031070Member"
xlink:label="C000031070Member"/>
<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
xlink:from="ShareClassDomain"
xlink:to="C000031070Member"
order="1.0"/>
</link:definitionLink>
<link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/rr/role/Class">
<link:loc xlink:type="locator"
xlink:href="http://xbrl.sec.gov/rr/2010/rr-2010-02-28.xsd#rr_ShareClassDomain"
xlink:label="ShareClassDomain"/>
<link:loc xlink:type="locator" xlink:href="sheltonfunds-20120101.xsd#sheltonfunds_C000031071Member"
xlink:label="C000031071Member"/>
<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
xlink:from="ShareClassDomain"
xlink:to="C000031071Member"
order="2.0"/>
</link:definitionLink>
<link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/rr/role/Class">
<link:loc xlink:type="locator"
xlink:href="http://xbrl.sec.gov/rr/2010/rr-2010-02-28.xsd#rr_ShareClassDomain"
xlink:label="ShareClassDomain"/>
<link:loc xlink:type="locator" xlink:href="sheltonfunds-20120101.xsd#sheltonfunds_C000031072Member"
xlink:label="C000031072Member"/>
<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
xlink:from="ShareClassDomain"
xlink:to="C000031072Member"
order="3.0"/>
</link:definitionLink>
<link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/rr/role/Class">
<link:loc xlink:type="locator"
xlink:href="http://xbrl.sec.gov/rr/2010/rr-2010-02-28.xsd#rr_ShareClassDomain"
xlink:label="ShareClassDomain"/>
<link:loc xlink:type="locator" xlink:href="sheltonfunds-20120101.xsd#sheltonfunds_C000044029Member"
xlink:label="C000044029Member"/>
<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
xlink:from="ShareClassDomain"
xlink:to="C000044029Member"
order="4.0"/>
</link:definitionLink>
<link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/rr/role/Class">
<link:loc xlink:type="locator"
xlink:href="http://xbrl.sec.gov/rr/2010/rr-2010-02-28.xsd#rr_ShareClassDomain"
xlink:label="ShareClassDomain"/>
<link:loc xlink:type="locator" xlink:href="sheltonfunds-20120101.xsd#sheltonfunds_C000044031Member"
xlink:label="C000044031Member"/>
<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
xlink:from="ShareClassDomain"
xlink:to="C000044031Member"
order="5.0"/>
</link:definitionLink>
<link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/rr/role/Class">
<link:loc xlink:type="locator"
xlink:href="http://xbrl.sec.gov/rr/2010/rr-2010-02-28.xsd#rr_ShareClassDomain"
xlink:label="ShareClassDomain"/>
<link:loc xlink:type="locator" xlink:href="sheltonfunds-20120101.xsd#sheltonfunds_C000044033Member"
xlink:label="C000044033Member"/>
<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
xlink:from="ShareClassDomain"
xlink:to="C000044033Member"
order="6.0"/>
</link:definitionLink>
<link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/rr/role/Class">
<link:loc xlink:type="locator"
xlink:href="http://xbrl.sec.gov/rr/2010/rr-2010-02-28.xsd#rr_ShareClassDomain"
xlink:label="ShareClassDomain"/>
<link:loc xlink:type="locator" xlink:href="sheltonfunds-20120101.xsd#sheltonfunds_C000044035Member"
xlink:label="C000044035Member"/>
<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
xlink:from="ShareClassDomain"
xlink:to="C000044035Member"
order="7.0"/>
</link:definitionLink>
<link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/rr/role/Class">
<link:loc xlink:type="locator"
xlink:href="http://xbrl.sec.gov/rr/2010/rr-2010-02-28.xsd#rr_ShareClassDomain"
xlink:label="ShareClassDomain"/>
<link:loc xlink:type="locator" xlink:href="sheltonfunds-20120101.xsd#sheltonfunds_C000044038Member"
xlink:label="C000044038Member"/>
<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
xlink:from="ShareClassDomain"
xlink:to="C000044038Member"
order="8.0"/>
</link:definitionLink>
<link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/rr/role/Class">
<link:loc xlink:type="locator"
xlink:href="http://xbrl.sec.gov/rr/2010/rr-2010-02-28.xsd#rr_ShareClassDomain"
xlink:label="ShareClassDomain"/>
<link:loc xlink:type="locator" xlink:href="sheltonfunds-20120101.xsd#sheltonfunds_C000044039Member"
xlink:label="C000044039Member"/>
<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
xlink:from="ShareClassDomain"
xlink:to="C000044039Member"
order="9.0"/>
</link:definitionLink>
<link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/rr/role/Class">
<link:loc xlink:type="locator"
xlink:href="http://xbrl.sec.gov/rr/2010/rr-2010-02-28.xsd#rr_ShareClassDomain"
xlink:label="ShareClassDomain"/>
<link:loc xlink:type="locator" xlink:href="sheltonfunds-20120101.xsd#sheltonfunds_C000044041Member"
xlink:label="C000044041Member"/>
<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
xlink:from="ShareClassDomain"
xlink:to="C000044041Member"
order="10.0"/>
</link:definitionLink>
<link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/rr/role/Class">
<link:loc xlink:type="locator"
xlink:href="http://xbrl.sec.gov/rr/2010/rr-2010-02-28.xsd#rr_ShareClassDomain"
xlink:label="ShareClassDomain"/>
<link:loc xlink:type="locator" xlink:href="sheltonfunds-20120101.xsd#sheltonfunds_C000044043Member"
xlink:label="C000044043Member"/>
<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
xlink:from="ShareClassDomain"
xlink:to="C000044043Member"
order="11.0"/>
</link:definitionLink>
<link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/rr/role/Class">
<link:loc xlink:type="locator"
xlink:href="http://xbrl.sec.gov/rr/2010/rr-2010-02-28.xsd#rr_ShareClassDomain"
xlink:label="ShareClassDomain"/>
<link:loc xlink:type="locator" xlink:href="sheltonfunds-20120101.xsd#sheltonfunds_C000044045Member"
xlink:label="C000044045Member"/>
<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
xlink:from="ShareClassDomain"
xlink:to="C000044045Member"
order="12.0"/>
</link:definitionLink>
<link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/rr/role/Class">
<link:loc xlink:type="locator"
xlink:href="http://xbrl.sec.gov/rr/2010/rr-2010-02-28.xsd#rr_ShareClassDomain"
xlink:label="ShareClassDomain"/>
<link:loc xlink:type="locator" xlink:href="sheltonfunds-20120101.xsd#sheltonfunds_C000044030Member"
xlink:label="C000044030Member"/>
<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
xlink:from="ShareClassDomain"
xlink:to="C000044030Member"
order="13.0"/>
</link:definitionLink>
<link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/rr/role/Class">
<link:loc xlink:type="locator"
xlink:href="http://xbrl.sec.gov/rr/2010/rr-2010-02-28.xsd#rr_ShareClassDomain"
xlink:label="ShareClassDomain"/>
<link:loc xlink:type="locator" xlink:href="sheltonfunds-20120101.xsd#sheltonfunds_C000044032Member"
xlink:label="C000044032Member"/>
<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
xlink:from="ShareClassDomain"
xlink:to="C000044032Member"
order="14.0"/>
</link:definitionLink>
<link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/rr/role/Class">
<link:loc xlink:type="locator"
xlink:href="http://xbrl.sec.gov/rr/2010/rr-2010-02-28.xsd#rr_ShareClassDomain"
xlink:label="ShareClassDomain"/>
<link:loc xlink:type="locator" xlink:href="sheltonfunds-20120101.xsd#sheltonfunds_C000044034Member"
xlink:label="C000044034Member"/>
<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
xlink:from="ShareClassDomain"
xlink:to="C000044034Member"
order="15.0"/>
</link:definitionLink>
<link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/rr/role/Class">
<link:loc xlink:type="locator"
xlink:href="http://xbrl.sec.gov/rr/2010/rr-2010-02-28.xsd#rr_ShareClassDomain"
xlink:label="ShareClassDomain"/>
<link:loc xlink:type="locator" xlink:href="sheltonfunds-20120101.xsd#sheltonfunds_C000044036Member"
xlink:label="C000044036Member"/>
<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
xlink:from="ShareClassDomain"
xlink:to="C000044036Member"
order="16.0"/>
</link:definitionLink>
<link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/rr/role/Class">
<link:loc xlink:type="locator"
xlink:href="http://xbrl.sec.gov/rr/2010/rr-2010-02-28.xsd#rr_ShareClassDomain"
xlink:label="ShareClassDomain"/>
<link:loc xlink:type="locator" xlink:href="sheltonfunds-20120101.xsd#sheltonfunds_C000044037Member"
xlink:label="C000044037Member"/>
<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
xlink:from="ShareClassDomain"
xlink:to="C000044037Member"
order="17.0"/>
</link:definitionLink>
<link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/rr/role/Class">
<link:loc xlink:type="locator"
xlink:href="http://xbrl.sec.gov/rr/2010/rr-2010-02-28.xsd#rr_ShareClassDomain"
xlink:label="ShareClassDomain"/>
<link:loc xlink:type="locator" xlink:href="sheltonfunds-20120101.xsd#sheltonfunds_C000044040Member"
xlink:label="C000044040Member"/>
<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
xlink:from="ShareClassDomain"
xlink:to="C000044040Member"
order="18.0"/>
</link:definitionLink>
<link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/rr/role/Class">
<link:loc xlink:type="locator"
xlink:href="http://xbrl.sec.gov/rr/2010/rr-2010-02-28.xsd#rr_ShareClassDomain"
xlink:label="ShareClassDomain"/>
<link:loc xlink:type="locator" xlink:href="sheltonfunds-20120101.xsd#sheltonfunds_C000044042Member"
xlink:label="C000044042Member"/>
<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
xlink:from="ShareClassDomain"
xlink:to="C000044042Member"
order="19.0"/>
</link:definitionLink>
<link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/rr/role/Class">
<link:loc xlink:type="locator"
xlink:href="http://xbrl.sec.gov/rr/2010/rr-2010-02-28.xsd#rr_ShareClassDomain"
xlink:label="ShareClassDomain"/>
<link:loc xlink:type="locator" xlink:href="sheltonfunds-20120101.xsd#sheltonfunds_C000044044Member"
xlink:label="C000044044Member"/>
<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
xlink:from="ShareClassDomain"
xlink:to="C000044044Member"
order="20.0"/>
</link:definitionLink>
<link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/rr/role/Class">
<link:loc xlink:type="locator"
xlink:href="http://xbrl.sec.gov/rr/2010/rr-2010-02-28.xsd#rr_ShareClassDomain"
xlink:label="ShareClassDomain"/>
<link:loc xlink:type="locator" xlink:href="sheltonfunds-20120101.xsd#sheltonfunds_C000044046Member"
xlink:label="C000044046Member"/>
<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
xlink:from="ShareClassDomain"
xlink:to="C000044046Member"
order="21.0"/>
</link:definitionLink>
<link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/rr/role/Class">
<link:loc xlink:type="locator"
xlink:href="http://xbrl.sec.gov/rr/2010/rr-2010-02-28.xsd#rr_ShareClassDomain"
xlink:label="ShareClassDomain"/>
<link:loc xlink:type="locator" xlink:href="sheltonfunds-20120101.xsd#sheltonfunds_C000088543Member"
xlink:label="C000088543Member"/>
<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
xlink:from="ShareClassDomain"
xlink:to="C000088543Member"
order="22.0"/>
</link:definitionLink>
<link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/rr/role/Class">
<link:loc xlink:type="locator"
xlink:href="http://xbrl.sec.gov/rr/2010/rr-2010-02-28.xsd#rr_ShareClassDomain"
xlink:label="ShareClassDomain"/>
<link:loc xlink:type="locator" xlink:href="sheltonfunds-20120101.xsd#sheltonfunds_C000088544Member"
xlink:label="C000088544Member"/>
<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
xlink:from="ShareClassDomain"
xlink:to="C000088544Member"
order="23.0"/>
</link:definitionLink>
<link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/rr/role/Class">
<link:loc xlink:type="locator"
xlink:href="http://xbrl.sec.gov/rr/2010/rr-2010-02-28.xsd#rr_ShareClassDomain"
xlink:label="ShareClassDomain"/>
<link:loc xlink:type="locator" xlink:href="sheltonfunds-20120101.xsd#sheltonfunds_C000088545Member"
xlink:label="C000088545Member"/>
<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
xlink:from="ShareClassDomain"
xlink:to="C000088545Member"
order="24.0"/>
</link:definitionLink>
<link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/rr/role/Class">
<link:loc xlink:type="locator"
xlink:href="http://xbrl.sec.gov/rr/2010/rr-2010-02-28.xsd#rr_ShareClassDomain"
xlink:label="ShareClassDomain"/>
<link:loc xlink:type="locator" xlink:href="sheltonfunds-20120101.xsd#sheltonfunds_C000088546Member"
xlink:label="C000088546Member"/>
<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
xlink:from="ShareClassDomain"
xlink:to="C000088546Member"
order="25.0"/>
</link:definitionLink>
<link:definitionLink xlink:type="extended"
xlink:role="http://xbrl.sec.gov/rr/role/PerformanceMeasure">
<link:loc xlink:type="locator"
xlink:href="http://xbrl.sec.gov/rr/2010/rr-2010-02-28.xsd#rr_PerformanceMeasureDomain"
xlink:label="PerformanceMeasureDomain"/>
<link:loc xlink:type="locator" xlink:href="sheltonfunds-20120101.xsd#sheltonfunds_bmbidMember"
xlink:label="bmbidMember"/>
<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
xlink:from="PerformanceMeasureDomain"
xlink:to="bmbidMember"
order="26.0"/>
</link:definitionLink>
<link:definitionLink xlink:type="extended"
xlink:role="http://xbrl.sec.gov/rr/role/PerformanceMeasure">
<link:loc xlink:type="locator"
xlink:href="http://xbrl.sec.gov/rr/2010/rr-2010-02-28.xsd#rr_PerformanceMeasureDomain"
xlink:label="PerformanceMeasureDomain"/>
<link:loc xlink:type="locator" xlink:href="sheltonfunds-20120101.xsd#sheltonfunds_b5mbidMember"
xlink:label="b5mbidMember"/>
<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
xlink:from="PerformanceMeasureDomain"
xlink:to="b5mbidMember"
order="27.0"/>
</link:definitionLink>
<link:definitionLink xlink:type="extended"
xlink:role="http://xbrl.sec.gov/rr/role/PerformanceMeasure">
<link:loc xlink:type="locator"
xlink:href="http://xbrl.sec.gov/rr/2010/rr-2010-02-28.xsd#rr_PerformanceMeasureDomain"
xlink:label="PerformanceMeasureDomain"/>
<link:loc xlink:type="locator" xlink:href="sheltonfunds-20120101.xsd#sheltonfunds_snpcspidMember"
xlink:label="snpcspidMember"/>
<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
xlink:from="PerformanceMeasureDomain"
xlink:to="snpcspidMember"
order="28.0"/>
</link:definitionLink>
<link:definitionLink xlink:type="extended"
xlink:role="http://xbrl.sec.gov/rr/role/PerformanceMeasure">
<link:loc xlink:type="locator"
xlink:href="http://xbrl.sec.gov/rr/2010/rr-2010-02-28.xsd#rr_PerformanceMeasureDomain"
xlink:label="PerformanceMeasureDomain"/>
<link:loc xlink:type="locator" xlink:href="sheltonfunds-20120101.xsd#sheltonfunds_snp400dMember"
xlink:label="snp400dMember"/>
<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
xlink:from="PerformanceMeasureDomain"
xlink:to="snp400dMember"
order="29.0"/>
</link:definitionLink>
<link:definitionLink xlink:type="extended"
xlink:role="http://xbrl.sec.gov/rr/role/PerformanceMeasure">
<link:loc xlink:type="locator"
xlink:href="http://xbrl.sec.gov/rr/2010/rr-2010-02-28.xsd#rr_PerformanceMeasureDomain"
xlink:label="PerformanceMeasureDomain"/>
<link:loc xlink:type="locator" xlink:href="sheltonfunds-20120101.xsd#sheltonfunds_snp600dMember"
xlink:label="snp600dMember"/>
<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
xlink:from="PerformanceMeasureDomain"
xlink:to="snp600dMember"
order="30.0"/>
</link:definitionLink>
<link:definitionLink xlink:type="extended"
xlink:role="http://xbrl.sec.gov/rr/role/PerformanceMeasure">
<link:loc xlink:type="locator"
xlink:href="http://xbrl.sec.gov/rr/2010/rr-2010-02-28.xsd#rr_PerformanceMeasureDomain"
xlink:label="PerformanceMeasureDomain"/>
<link:loc xlink:type="locator" xlink:href="sheltonfunds-20120101.xsd#sheltonfunds_snpcitidMember"
xlink:label="snpcitidMember"/>
<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
xlink:from="PerformanceMeasureDomain"
xlink:to="snpcitidMember"
order="31.0"/>
</link:definitionLink>
<link:definitionLink xlink:type="extended"
xlink:role="http://xbrl.sec.gov/rr/role/PerformanceMeasure">
<link:loc xlink:type="locator"
xlink:href="http://xbrl.sec.gov/rr/2010/rr-2010-02-28.xsd#rr_PerformanceMeasureDomain"
xlink:label="PerformanceMeasureDomain"/>
<link:loc xlink:type="locator" xlink:href="sheltonfunds-20120101.xsd#sheltonfunds_snpcspiedMember"
xlink:label="snpcspiedMember"/>
<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
xlink:from="PerformanceMeasureDomain"
xlink:to="snpcspiedMember"
order="32.0"/>
</link:definitionLink>
<link:definitionLink xlink:type="extended"
xlink:role="http://xbrl.sec.gov/rr/role/PerformanceMeasure">
<link:loc xlink:type="locator"
xlink:href="http://xbrl.sec.gov/rr/2010/rr-2010-02-28.xsd#rr_PerformanceMeasureDomain"
xlink:label="PerformanceMeasureDomain"/>
<link:loc xlink:type="locator" xlink:href="sheltonfunds-20120101.xsd#sheltonfunds_n100dMember"
xlink:label="n100dMember"/>
<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
xlink:from="PerformanceMeasureDomain"
xlink:to="n100dMember"
order="33.0"/>
</link:definitionLink>
<link:definitionLink xlink:type="extended"
xlink:role="http://xbrl.sec.gov/rr/role/PerformanceMeasure">
<link:loc xlink:type="locator"
xlink:href="http://xbrl.sec.gov/rr/2010/rr-2010-02-28.xsd#rr_PerformanceMeasureDomain"
xlink:label="PerformanceMeasureDomain"/>
<link:loc xlink:type="locator" xlink:href="sheltonfunds-20120101.xsd#sheltonfunds_dje50dMember"
xlink:label="dje50dMember"/>
<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
xlink:from="PerformanceMeasureDomain"
xlink:to="dje50dMember"
order="34.0"/>
</link:definitionLink>
<link:definitionLink xlink:type="extended"
xlink:role="http://xbrl.sec.gov/rr/role/PerformanceMeasure">
<link:loc xlink:type="locator"
xlink:href="http://xbrl.sec.gov/rr/2010/rr-2010-02-28.xsd#rr_PerformanceMeasureDomain"
xlink:label="PerformanceMeasureDomain"/>
<link:loc xlink:type="locator" xlink:href="sheltonfunds-20120101.xsd#sheltonfunds_bgnmadMember"
xlink:label="bgnmadMember"/>
<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
xlink:from="PerformanceMeasureDomain"
xlink:to="bgnmadMember"
order="35.0"/>
</link:definitionLink>
<link:definitionLink xlink:type="extended"
xlink:role="http://xbrl.sec.gov/rr/role/PerformanceMeasure">
<link:loc xlink:type="locator"
xlink:href="http://xbrl.sec.gov/rr/2010/rr-2010-02-28.xsd#rr_PerformanceMeasureDomain"
xlink:label="PerformanceMeasureDomain"/>
<link:loc xlink:type="locator" xlink:href="sheltonfunds-20120101.xsd#sheltonfunds_btidMember"
xlink:label="btidMember"/>
<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
xlink:from="PerformanceMeasureDomain"
xlink:to="btidMember"
order="36.0"/>
</link:definitionLink>
<link:definitionLink xlink:type="extended"
xlink:role="http://xbrl.sec.gov/rr/role/PerformanceMeasure">
<link:loc xlink:type="locator"
xlink:href="http://xbrl.sec.gov/rr/2010/rr-2010-02-28.xsd#rr_PerformanceMeasureDomain"
xlink:label="PerformanceMeasureDomain"/>
<link:loc xlink:type="locator" xlink:href="sheltonfunds-20120101.xsd#sheltonfunds_b13tidMember"
xlink:label="b13tidMember"/>
<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
xlink:from="PerformanceMeasureDomain"
xlink:to="b13tidMember"
order="37.0"/>
</link:definitionLink>
<link:definitionLink xlink:type="extended"
xlink:role="http://xbrl.sec.gov/rr/role/PerformanceMeasure">
<link:loc xlink:type="locator"
xlink:href="http://xbrl.sec.gov/rr/2010/rr-2010-02-28.xsd#rr_PerformanceMeasureDomain"
xlink:label="PerformanceMeasureDomain"/>
<link:loc xlink:type="locator" xlink:href="sheltonfunds-20120101.xsd#sheltonfunds_snpcspikMember"
xlink:label="snpcspikMember"/>
<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
xlink:from="PerformanceMeasureDomain"
xlink:to="snpcspikMember"
order="38.0"/>
</link:definitionLink>
<link:definitionLink xlink:type="extended"
xlink:role="http://xbrl.sec.gov/rr/role/PerformanceMeasure">
<link:loc xlink:type="locator"
xlink:href="http://xbrl.sec.gov/rr/2010/rr-2010-02-28.xsd#rr_PerformanceMeasureDomain"
xlink:label="PerformanceMeasureDomain"/>
<link:loc xlink:type="locator" xlink:href="sheltonfunds-20120101.xsd#sheltonfunds_snp400kMember"
xlink:label="snp400kMember"/>
<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
xlink:from="PerformanceMeasureDomain"
xlink:to="snp400kMember"
order="39.0"/>
</link:definitionLink>
<link:definitionLink xlink:type="extended"
xlink:role="http://xbrl.sec.gov/rr/role/PerformanceMeasure">
<link:loc xlink:type="locator"
xlink:href="http://xbrl.sec.gov/rr/2010/rr-2010-02-28.xsd#rr_PerformanceMeasureDomain"
xlink:label="PerformanceMeasureDomain"/>
<link:loc xlink:type="locator" xlink:href="sheltonfunds-20120101.xsd#sheltonfunds_snp600kMember"
xlink:label="snp600kMember"/>
<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
xlink:from="PerformanceMeasureDomain"
xlink:to="snp600kMember"
order="40.0"/>
</link:definitionLink>
<link:definitionLink xlink:type="extended"
xlink:role="http://xbrl.sec.gov/rr/role/PerformanceMeasure">
<link:loc xlink:type="locator"
xlink:href="http://xbrl.sec.gov/rr/2010/rr-2010-02-28.xsd#rr_PerformanceMeasureDomain"
xlink:label="PerformanceMeasureDomain"/>
<link:loc xlink:type="locator" xlink:href="sheltonfunds-20120101.xsd#sheltonfunds_snpcitikMember"
xlink:label="snpcitikMember"/>
<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
xlink:from="PerformanceMeasureDomain"
xlink:to="snpcitikMember"
order="41.0"/>
</link:definitionLink>
<link:definitionLink xlink:type="extended"
xlink:role="http://xbrl.sec.gov/rr/role/PerformanceMeasure">
<link:loc xlink:type="locator"
xlink:href="http://xbrl.sec.gov/rr/2010/rr-2010-02-28.xsd#rr_PerformanceMeasureDomain"
xlink:label="PerformanceMeasureDomain"/>
<link:loc xlink:type="locator" xlink:href="sheltonfunds-20120101.xsd#sheltonfunds_snpcspiekMember"
xlink:label="snpcspiekMember"/>
<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
xlink:from="PerformanceMeasureDomain"
xlink:to="snpcspiekMember"
order="42.0"/>
</link:definitionLink>
<link:definitionLink xlink:type="extended"
xlink:role="http://xbrl.sec.gov/rr/role/PerformanceMeasure">
<link:loc xlink:type="locator"
xlink:href="http://xbrl.sec.gov/rr/2010/rr-2010-02-28.xsd#rr_PerformanceMeasureDomain"
xlink:label="PerformanceMeasureDomain"/>
<link:loc xlink:type="locator" xlink:href="sheltonfunds-20120101.xsd#sheltonfunds_n100kMember"
xlink:label="n100kMember"/>
<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
xlink:from="PerformanceMeasureDomain"
xlink:to="n100kMember"
order="43.0"/>
</link:definitionLink>
<link:definitionLink xlink:type="extended"
xlink:role="http://xbrl.sec.gov/rr/role/PerformanceMeasure">
<link:loc xlink:type="locator"
xlink:href="http://xbrl.sec.gov/rr/2010/rr-2010-02-28.xsd#rr_PerformanceMeasureDomain"
xlink:label="PerformanceMeasureDomain"/>
<link:loc xlink:type="locator" xlink:href="sheltonfunds-20120101.xsd#sheltonfunds_dje50kMember"
xlink:label="dje50kMember"/>
<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
xlink:from="PerformanceMeasureDomain"
xlink:to="dje50kMember"
order="44.0"/>
</link:definitionLink>
<link:definitionLink xlink:type="extended"
xlink:role="http://xbrl.sec.gov/rr/role/PerformanceMeasure">
<link:loc xlink:type="locator"
xlink:href="http://xbrl.sec.gov/rr/2010/rr-2010-02-28.xsd#rr_PerformanceMeasureDomain"
xlink:label="PerformanceMeasureDomain"/>
<link:loc xlink:type="locator" xlink:href="sheltonfunds-20120101.xsd#sheltonfunds_bgnmakMember"
xlink:label="bgnmakMember"/>
<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
xlink:from="PerformanceMeasureDomain"
xlink:to="bgnmakMember"
order="45.0"/>
</link:definitionLink>
<link:definitionLink xlink:type="extended"
xlink:role="http://xbrl.sec.gov/rr/role/PerformanceMeasure">
<link:loc xlink:type="locator"
xlink:href="http://xbrl.sec.gov/rr/2010/rr-2010-02-28.xsd#rr_PerformanceMeasureDomain"
xlink:label="PerformanceMeasureDomain"/>
<link:loc xlink:type="locator" xlink:href="sheltonfunds-20120101.xsd#sheltonfunds_btikMember"
xlink:label="btikMember"/>
<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
xlink:from="PerformanceMeasureDomain"
xlink:to="btikMember"
order="46.0"/>
</link:definitionLink>
<link:definitionLink xlink:type="extended"
xlink:role="http://xbrl.sec.gov/rr/role/PerformanceMeasure">
<link:loc xlink:type="locator"
xlink:href="http://xbrl.sec.gov/rr/2010/rr-2010-02-28.xsd#rr_PerformanceMeasureDomain"
xlink:label="PerformanceMeasureDomain"/>
<link:loc xlink:type="locator" xlink:href="sheltonfunds-20120101.xsd#sheltonfunds_b13tikMember"
xlink:label="b13tikMember"/>
<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
xlink:from="PerformanceMeasureDomain"
xlink:to="b13tikMember"
order="47.0"/>
</link:definitionLink>

<link:definitionLink xlink:type="extended"
xlink:role="http://xbrl.sec.gov/rr/role/PerformanceMeasure">
<link:loc xlink:type="locator"
xlink:href="http://xbrl.sec.gov/rr/2010/rr-2010-02-28.xsd#rr_PerformanceMeasureDomain"
xlink:label="PerformanceMeasureDomain"/>
<link:loc xlink:type="locator" xlink:href="sheltonfunds-20120101.xsd#sheltonfunds_index1Member"
xlink:label="index1Member"/>
<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
xlink:from="PerformanceMeasureDomain"
xlink:to="index1Member"
order="48.0"/>
</link:definitionLink>
<link:definitionLink xlink:type="extended"
xlink:role="http://xbrl.sec.gov/rr/role/PerformanceMeasure">
<link:loc xlink:type="locator"
xlink:href="http://xbrl.sec.gov/rr/2010/rr-2010-02-28.xsd#rr_PerformanceMeasureDomain"
xlink:label="PerformanceMeasureDomain"/>
<link:loc xlink:type="locator" xlink:href="sheltonfunds-20120101.xsd#sheltonfunds_index2Member"
xlink:label="index2Member"/>
<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
xlink:from="PerformanceMeasureDomain"
xlink:to="index2Member"
order="49.0"/>
</link:definitionLink>
<link:definitionLink xlink:type="extended"
xlink:role="http://xbrl.sec.gov/rr/role/PerformanceMeasure">
<link:loc xlink:type="locator"
xlink:href="http://xbrl.sec.gov/rr/2010/rr-2010-02-28.xsd#rr_PerformanceMeasureDomain"
xlink:label="PerformanceMeasureDomain"/>
<link:loc xlink:type="locator" xlink:href="sheltonfunds-20120101.xsd#sheltonfunds_index3Member"
xlink:label="index3Member"/>
<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
xlink:from="PerformanceMeasureDomain"
xlink:to="index3Member"
order="50.0"/>
</link:definitionLink>

</link:linkbase>