Form 497 OPPORTUNITY OF CREDIT SUISSE

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CREDIT SUISSE OPPORTUNITY FUND
Credit Suisse Floating Rate High Income Fund
Credit Suisse Strategic Income Fund
(each a ?? Fund ?? and collectively the ?? Fund ??)

Supplement of October 28, 2021
the Prospectus and the Summary of the Prospectuses, each dated February 28, 2021

With immediate effect, Joshua Shedroff will join Credit Suisse Credit Investments Group as portfolio manager of the Funds. As a result, the funds ?? The Prospectus and the Summary of the Prospectuses are updated as indicated below.

The section entitled “Credit Suisse Floating Rate High Income Fund” Summary ?? Portfolio Management ?? Portfolio managers ?? in the Prospectus and the section entitled “Credit Suisse Floating Rate High Income Fund” Portfolio Management ?? Portfolio managers ?? in the Summary Prospectus are deleted in their entirety and replaced by the following:

Credit Suisse Credit Investments Group is responsible for the day-to-day management of the fund portfolio. The current team members are John G. Popp, Managing Director of Credit Suisse, Thomas J. Flannery, Managing Director of Credit Suisse, Louis I. Farano, Managing Director of Credit Suisse, David J. Mechlin, Managing Director of Credit Switzerland, Joshua Shedroff, Director of Credit Suisse, and Wing Chan, Managing Director of Credit Suisse. MM. Popp, Flannery, Farano, Mechlin and Shedroff and Ms. Chan have been members of Credit Suisse Credit Investments Group since 1997, 1998, 2006, 2006, 2008 and 2005, respectively.

The section entitled “Credit Suisse Strategic Income Fund” Summary ?? Portfolio Management ?? Portfolio managers ?? in the Prospectus and the section entitled “Credit Suisse Strategic Income Fund” Portfolio Management ?? Portfolio managers ?? in the Summary Prospectus are deleted in their entirety and replaced by the following:

Credit Suisse Credit Investments Group is responsible for the day-to-day management of the fund portfolio. The current team members are John G. Popp, Managing Director of Credit Suisse, Andrew H. Marshak, Managing Director of Credit Suisse UK, Thomas J. Flannery, Managing Director of Credit Suisse, Louis I. Farano, Managing Director of Credit Suisse, David J. Mechlin, Managing Director of Credit Suisse, Joshua Shedroff, Managing Director of Credit Suisse and Wing Chan, Managing Director of Credit Suisse. MM. Popp, Marshak, Flannery, Farano, Mechlin and Shedroff and Ms. Chan have been members of Credit Suisse Credit Investments Group since 1997, 1997, 1998, 2006, 2006, 2008 and 2005, respectively, and portfolio managers of the fund since its inception, at with the exception of Mr. Shedroff who has been the fund’s portfolio manager since 2021.

The section titled ?? Meet the Managers ?? High Income Floating Rate Fund ?? in the Prospectus is deleted in its entirety and replaced by the following.

The Credit Suisse Credit Investments Group (?? CIG ??) is responsible for the day-to-day management of the portfolio of the Floating Rate High Income Fund. The current members of the fund management team are John G. Popp, Thomas J. Flannery, Louis I. Farano, David J. Mechlin, Joshua Shedroff and Wing Chan. John G. Popp is the lead manager of the Floating Rate High Income Fund and oversees the entire industry, credit, duration, yield curve positioning and security selection of the Floating Rate High Income Fund. . Thomas J. Flannery, Louis I. Farano, David Mechlin, Joshua Shedroff and Wing Chan focus on sector and issuer allocations of the High Rate Floating Rate Fund.

The section titled ?? Meet the Managers ?? Strategic Income Fund ?? in the Prospectus is deleted in its entirety and replaced by the following.

CIG is responsible for the day-to-day management of the Strategic Income Fund portfolio. The current members of the fund management team are John G. Popp, Andrew H. Marshak, Thomas J. Flannery, Louis I. Farano, David J. Mechlin, Joshua Shedroff and Wing Chan. John G. Popp is the lead manager of the Strategic Income Fund and oversees the asset allocation objectives and overall security selection of the Strategic Income Fund. Andrew H. Marshak, Thomas J. Flannery, Louis I. Farano, David Mechlin, Joshua Shedroff and Wing Chan focus on the different types of debt instruments.

CREDIT SUISSE OPTUNITY FUND
Credit Suisse Floating Rate High Income Fund
Credit Suisse Strategic Income Fund
(each a ?? Fund ?? and collectively the ?? Fund ??)

Supplement of October 28, 2021
to the declaration of additional information dated February 28, 2021

With immediate effect, Joshua Shedroff will join Credit Suisse Credit Investment Group as portfolio manager of the Funds.

Following the addition, effective immediately, the following changes are made to the Funds ?? Declaration of additional information:

The following information in the table in the section titled ?? Fund Management ?? Portfolio managers ?? Portfolio managers ?? Ownership of securities ?? relating to the Floating Rate High Income Fund and the Strategic Income Fund is hereby added:

Funds

Portfolio name
Manager (s)

Range of equities in dollars
Titles in
each Fund managed by the
appointed
Portfolio manager *

Floating Rate High Income Fund

Joshua Shedroff **

A

Strategic Income Fund

Joshua Shedroff **

A

* Key to the dollar ranges:

To anyone

B. $ 1 ?? $ 10,000

C. $ 10,001 ?? $ 50,000

D. $ 50,001 ?? $ 100,000

E. Over $ 100,000

** Information provided as of September 30, 2021.

The following information in the table in the section titled ?? Fund Management ?? Portfolio managers ?? Registered investment companies, joint investment vehicles and other managed accounts ?? is added to this table as of September 30, 2021.

Registered placement
Companies

Other pooling
Investment vehicles

Other accounts

Funds

Name of
Wallet
Manager (s)

Number of
Accounts

Total assets

Number of
Accounts

Total assets

Number of
Accounts

Total assets

Floating Rate High Income Fund

Joshua Shedroff *

4

$

3,861
million

53

$

37,609
million

31

$

16 237
million

Strategic Income Fund

Joshua Shedroff *

4

$

3,861
million

53

$

37,609
million

31

$

16 237
million

* As of September 30, 2021, Mr. Shedroff managed 41 accounts with total assets under management of $ 26,746 million that have additional fees based on account performance.

Shareholders should retain this supplement for future reference.

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