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taviso's profile
Tavis Ormandy
Tavis Ormandy
Tavis Ormandy
Verified account
@taviso

Tweets

Tavis OrmandyVerified account

@taviso

Vulnerability researcher at Google. This is a personal stream, opinions expressed are mine.

California
taviso.decsystem.org
Joined April 2008

Tweets

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    1. Jeremiah Grossman‏Verified account @jeremiahg 30 Nov 2018
      • Report Tweet
      • Report NetzDG Violation

      Jeremiah Grossman Retweeted Marriott International

      1. Breach disclosed on a Friday. 2. The data about 500m people DOES NOT belong to their guests, but to Marriott. They have every right to allow it be compromised. 3. Breach unlikely to be costly, and affect stock price. 4. Other hotel chains should consider incident response.https://twitter.com/MarriottIntl/status/1068460980621971456 …

      Jeremiah Grossman added,

      Marriott InternationalVerified account @MarriottIntl
      Marriott values our guests and understands the importance of protecting personal information. For more information on the Starwood guest reservation database security incident, please visit http://info.starwoodhotels.com .
      18 replies 17 retweets 51 likes
      Show this thread
    2. Tavis Ormandy‏Verified account @taviso 30 Nov 2018
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      Replying to @jeremiahg

      I've started buying stock after every breach announcement (seriously).

      7 replies 10 retweets 54 likes
    3. Lee Holmes‏Verified account @Lee_Holmes 30 Nov 2018
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      Replying to @taviso @jeremiahg

      Would be amazing if you shared the performance of the "Ormandy Index Fund of recently breached companies" on a semi-regular basis. It's a fun investment strategy - yet I will be surprised if it beats S&P.

      2 replies 0 retweets 12 likes
    4. Tavis Ormandy‏Verified account @taviso 30 Nov 2018
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      Replying to @Lee_Holmes @jeremiahg

      I dunno, I think it might outperform. The hard part is calling the bottom and the size of the position, I just buy near the market close on the day of the announcement and proportional to the size of the reaction.

      1 reply 0 retweets 5 likes
    5. Lee Holmes‏Verified account @Lee_Holmes 30 Nov 2018
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      Replying to @taviso @jeremiahg

      And the exit. If it's too long, then you're basically investing in an arbitrary smattering of companies waiting for them to recover. If it's too short, you might miss the full opportunity of the swing.

      1 reply 0 retweets 1 like
    6. Tavis Ormandy‏Verified account @taviso 30 Nov 2018
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      Replying to @Lee_Holmes @jeremiahg

      Yep, I'm only interested in holding until reversion to it's pre-announcement price (or close to it, if the broader market is down). I just don't believe data breaches affect company stock performance (which is unfortunate, cause they might be motivated to prevent them 😞).

      2 replies 0 retweets 5 likes
    7. Lee Holmes‏Verified account @Lee_Holmes 30 Nov 2018
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      Replying to @taviso @jeremiahg

      Things aren't looking good for $OIF!pic.twitter.com/NwMMccn1SM

      1 reply 0 retweets 4 likes
    8. Tavis Ormandy‏Verified account @taviso 30 Nov 2018
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      Replying to @Lee_Holmes @jeremiahg

      I don't follow, that seems really good?

      1 reply 0 retweets 1 like
    9. Tavis Ormandy‏Verified account @taviso 30 Nov 2018
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      Replying to @taviso @Lee_Holmes @jeremiahg

      To make sure we're on the same page, my theory is you buy following an announcement proportional to the size of the reaction, then sell at the pre-announce price (or where it would be if it followed the broader market). Based on those notes, it seems like it beat the market?

      2 replies 0 retweets 1 like
      Tavis Ormandy‏Verified account @taviso 30 Nov 2018
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      Replying to @taviso @Lee_Holmes @jeremiahg

      e.g. let's say you invest $1 per basis point loss after a breach announcement, just to keep math simple. Multiply by the size of the reaction, so a 5% dip means you invest $500, then sell when the stock recovers to the price it would be if it had followed the sector.

      4:30 PM - 30 Nov 2018
      • 4 Likes
      • Seguridad Informátic Jeremy Hall . Ƙɑɑяηɑɑ˥˥™
      1 reply 0 retweets 4 likes
        1. New conversation
        2. titon‏ @_titon_ 30 Nov 2018
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          Replying to @taviso @Lee_Holmes @jeremiahg

          Curious... did you buy SuperMicro’s stocks back in October. According to Bloomberg/Businessweek they facilitated a bunch of data breaches. 🙄pic.twitter.com/5JRQdVbUc1

          1 reply 0 retweets 0 likes
        3. Tavis Ormandy‏Verified account @taviso 30 Nov 2018
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          Replying to @_titon_ @Lee_Holmes @jeremiahg

          Tavis Ormandy Retweeted Tavis Ormandy

          Yep, sure did 😁https://twitter.com/taviso/status/1048637201355960321 …

          Tavis Ormandy added,

          Tavis OrmandyVerified account @taviso
          Replying to @taviso @kennwhite @riskybusiness
          I just opened a modest $SMCI long position because I don't believe the story, going to email investor relations and ask if they're investigating legal action 😆
          1 reply 1 retweet 1 like
        4. 1 more reply

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