Quarterly report pursuant to Section 13 or 15(d)

Marketable Securities

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Marketable Securities
6 Months Ended
Jul. 31, 2024
Investments, Debt and Equity Securities [Abstract]  
Marketable Securities Marketable Securities
The following is a summary of available-for-sale marketable securities, excluding those securities classified within cash and cash equivalents on the condensed consolidated balance sheets:
July 31, 2024
(in thousands) Amortized Cost Unrealized Gains Unrealized Losses Fair value
Corporate bonds $ 62,553  $ 19  $ (21) $ 62,551 
Municipal bonds 997  —  —  997 
U.S. government and agency securities 131,244  —  (98) 131,146 
Certificates of deposit 45,682  22  (3) 45,701 
Commercial paper 108,977  (45) 108,937 
Marketable securities $ 349,453  $ 46  $ (167) $ 349,332 
January 31, 2024
(in thousands) Amortized Cost Unrealized Gains Unrealized Losses Fair value
Corporate bonds $ 98,642  $ 71  $ (10) $ 98,703 
Municipal bonds 982  —  985 
U.S. government and agency securities 185,464  140  (33) 185,571 
Certificates of deposit 46,496  48  (1) 46,543 
Commercial paper 166,595  155  (21) 166,729 
Marketable securities $ 498,179  $ 417  $ (65) $ 498,531 
As of July 31, 2024 and January 31, 2024, the maturities of available-for-sale marketable securities did not exceed 12 months. Interest income from cash and cash equivalents and marketable securities was $7.0 million and $15.3 million for the three and six months ended July 31, 2024, respectively, and $7.9 million and $13.9 million for the three and six months ended July 31, 2023, respectively.
There were 74 and 64 debt securities in an unrealized loss position as of July 31, 2024 and January 31, 2024, respectively. The estimated fair value of these debt securities, for which an allowance for credit losses has not been recorded, was $255.4 million and $178.7 million as of July 31, 2024 and January 31, 2024, respectively. There were no expected credit losses recorded against the Company’s investment securities as of July 31, 2024 and January 31, 2024.
Unrealized losses on the Company’s debt securities are not considered to be credit-related based upon an analysis that considered the extent to which the fair value is less than the amortized basis of a security, adverse conditions specifically related to the security, changes to credit rating of the instrument subsequent to Company purchase, and the strength of the underlying collateral, if any.
Refer to Note 5, Fair Value Measurements, for information about the fair value of the Company’s fair value hierarchy for short-term marketable securities.