<PAGE>
FORM N-SAR
SEMI-ANNUAL REPORT
FOR REGISTERED INVESTMENT COMPANIES
Report for six month period ending: / / (a)
or fiscal year ending: / / (b) 12/31/97
Report for the transition period ending: (c)
[If transition report also complete (a) or (b) above]
Is this an amendment to a previous filing (Y/N): N
Those items or sub-items with a box "[/]" after the term number should be
completed only if the answer has changed from the previous filing on this form.
- ----------------------------------------------------------------------------
1. A. Registrant Name: SECURITY LIFE SEPARATE ACCOUNT A1
B. File Number: 811-8196
C. Telephone Number: (303) 860-1290
2. A. Street: 1290 Broadway
B. City: Denver
C. State: CO
D. Zip Code: 80203 Zip Ext.: 5699
3. Is this the first filing on this form by Registrant? (Y/N) N
4. Is this the last filing on this form by Registrant? (Y/N) N
5. Is Registrant a small business investment company (SBIC)? (Y/N) N
[If answer is "Y", complete only items 89 through 110.]
6. Is Registrant a unit investment trust (UIT)? (Y/N) Y
[If answer is "Y", complete only items 111 through 132.]
7. A. Is Registrant a series or multiple portfolio company (Y/N) N
[If answer is "N", go to item 8.]
B. How may separate series or portfolios did Registrant
have at the end of the period?
<PAGE>
For period ending: 12/31/97
File Number 811-8196
UNIT INVESTMENT TRUST
111. A. Depositor Name: SECURITY LIFE OF DENVER INSURANCE COMPANY
B. File Number (if any):33-78444; 33-72564
C. City: Denver State: CO Zip Code: 80203 Zip Ext.: 5699
112. A. Sponsor Name: SECURITY LIFE OF DENVER INSURANCE COMPANY
B. File Number (if any): 33-78444; 33-72564
C. City: Denver State: CO Zip Code: 80203 Zip Ext.: 5699
113. A. Trustee Name:
B. City: State: Zip Code: Zip Ext.:
114. A. Principal Underwriter: ING AMERICA EQUITIES, INC.
B. File Number: 8-47089
C: City: Denver State: CO Zip Code: 80203 Zip Ext.: 5699
115. A. Independent Public Account Name: ERNST & YOUNG, LLP
B: City: Denver State: CO Zip Code: 80202 Zip Ext.: 9971
<PAGE>
For period ending: 12/31/97
File Number 811-8196
116. Family of investment companies information:
A. Is Registrant part of a family of investment companies? (Y/N) Y
B. Identify the family in 10 letters: SECLIFEDEN
(NOTE: In filing this form, use this identification consistently for all
investment companies in family. This designation is for purposes of this
form only.)
117. A. Is Registrant a separate account of an insurance company? (Y/N)Y
If answer is "Y", are any of the following types of contracts funded
by the Registrant:
B. Variable annuity contracts (Y/N) Y
C. Scheduled premium variable life contracts (Y/N) N
D. Flexible premium variable life contracts (Y/N) N
E. Other types of insurance policies registered under the
Securities Act of 1933? (Y/N) N
118. State the number of series existing at the end of the period 2
that had securities registered under the Securities Act of 1933.
119. State the number of new series for which registration statements 0
under the Securities Act of 1933 became effective during the period
120. State the total value of the portfolio securities on the date of 0
deposit of the new series included in item 119 ($000 omitted)
121. State the number of series for which a current prospectus was in 1
existence at the end of the period
122. State the number of existing series for which additional units 0
were registered under the Securities Act of 1933 during the current
period.
<PAGE>
For period ending: 12/31/97
File Number 811-8196
123. State the total value of the additional units considered 0
in answering item 122 ($000 omitted)
124. State the total value of units of prior series that were 0
placed in the portfolios of subsequent series during the
current period (the value of these units is to be
measured on the date they were placed in the subsequent
series) ($000 omitted)
125. State the total dollar amount of sales loads collected $8,486
(before reallowances to other brokers or dealers) by
Registrant's principal underwriter and any underwriter
which is an affiliated person of the principal underwriter
during the current period solely from the sale of the
units of all series of Registrant ($000 omitted)
126 Of the amount shown in item 125, state the total dollar amount $0
of sale loads collected from secondary market operations in
Registrant's units (include the sales loads, if any,
collected on units of a prior series placed in the
portfolio of a subsequent series)
127. List opposite the appropriate description below the number
of series whose portfolios are invested primarily (based
upon a percentage of MAV) in each type of security shown,
the aggregate total assets at market value as of a date
or near the end of the current period of each such group
of series and the total income distributions made by each
such group of series during the current period (excluding
distributions of realized gains, if any):
<TABLE>
<CAPTION>
Number of Total Assets Total Income
Series ($000's Distribution
Investing omitted) ($000's omitted)
--------- -------- ---------------
<S> <C> <C>
A. U.S. Treasury direct issues $ $
B. U.S. Government agency $ $
C. State and municipal tax-free $ $
D. Public Utility debt $ $
E. Brokers or dealers debt or debt of
brokers' or dealers' parent $ $
F. All other corporate intermediate & long-term debt $ $
G. All other corporate short-term debt $ $
H. Equity securities of brokers or dealer or
parent of brokers or dealers $ $
I. Investment company equity securities $ $
J. All other equity securities 2 $101,833 $0
K. Other securities $ $
--------------------- ---------------
L. Total Assets of all series of Registrant $101,833 $0
</TABLE>
<PAGE>
For period ending: 12/31/97
File Number 811-8196
128. Is the timely payment of principal and interest on N
any of the portfolio securities held by any of
Registrant's series at the end of the current prior
insurance or guaranteed by an entity other than the
issuer? [If answer is "N" (No), go to item 131.]
129. Is the issuer of any instrument covered in item 128
delinquent or in default as to payment of principal
or interest at the end of the current period?
130. In computations of NAV or offering price per unit,
is any par of the value attributed to instruments
identified in item 129 derived from insurance or
guarantees? (Y/N)
131. Total expenses incurred by all series of Registrant $1,310
during the current reporting period ($000 omitted)
132. List the "811" (Investment Company Act of 1940) 811-8196
registration number for all Series of Registrant
that are being included in this filing:
<PAGE>
For period ending: 12/31/97
File Number 811-8196
This Report is signed on behalf of the Registrant in the city of Denver and
State of Colorado on the 27th day of February, 1998.
Security Life of Denver Insurance Company (Registrant)
By: /s/: STEPHEN M. CHRISTOPHER
-------------------------------------------------------
Stephen M. Christopher, President