Bernt Øksendal

• Agram, Nacira; Bachouch, Achref; Øksendal, Bernt & Proske, Frank Norbert (2019). Singular control and optimal stopping of memory mean-field processes. SIAM Journal on Mathematical Analysis.  ISSN 0036-1410.  51(1), s 450- 468
• Agram, Nacira; Hilbert, Astrid & Øksendal, Bernt (2019). Singular control of SPDEs with space-mean dynamics. Mathematical Control and Related Fields.  ISSN 2156-8472.
• Agram, Nacira & Øksendal, Bernt (2019). Mean-field stochastic control with elephant memory in infinite time horizon. Stochastics: An International Journal of Probability and Stochastic Processes.  ISSN 1744-2508. . doi: 10.1080/17442508.2019.1635600
• Agram, Nacira & Øksendal, Bernt (2019). Model uncertainty stochastic mean-field control. Stochastic Analysis and Applications.  ISSN 0736-2994.  s 1- 21 . doi: 10.1080/07362994.2018.1499036
• Agram, Nacira; Øksendal, Bernt & Yakhlef, Samia (2019). New approach to optimal control of stochastic Volterra integral equations. Stochastics: An International Journal of Probability and Stochastic Processes.  ISSN 1744-2508.
• Draouil, Olfa & Øksendal, Bernt (2019). A white noise approach to optimal insider control of systems with delay. Journal of Mathematical Analysis and Applications.  ISSN 0022-247X.  476(1), s 101- 119 . doi: 10.1016/j.jmaa.2019.02.065
• Draouil, Olfa & Øksendal, Bernt (2019). Viable insider markets. Stochastics: An International Journal of Probability and Stochastic Processes.  ISSN 1744-2508. . doi: 10.1080/17442508.2019.1612895
• Agram, Nacira; Haadem, Sven; Øksendal, Bernt & Proske, Frank Norbert (2018). Optimal stopping, randomized stopping and singular control with partial information flow. arXiv.org.  ISSN 2331-8422.
• Agram, Nacira; Hilbert, Astrid & Øksendal, Bernt (2018). SPDEs with Space-Mean Dynamics. arXiv.org.  ISSN 2331-8422.
• Agram, Nacira; Hu, Yaozhong & Øksendal, Bernt (2018). Mean-field backward stochastic differential equations and applications. arXiv.org.  ISSN 2331-8422.
• Agram, Nacira & Øksendal, Bernt (2018). A Hida-Malliavin white noise calculus approach to optimal control. Infinite Dimensional Analysis Quantum Probability and Related Topics.  ISSN 0219-0257.  21(3), s 1850014-1- 1850014-21 . doi: 10.1142/S0219025718500145 Full text in Research Archive.
• Agram, Nacira & Øksendal, Bernt (2018). Mean-Field Stochastic Control with Elephant Memory in Finite and Infinite Time Horizon. arXiv.org.  ISSN 2331-8422.
• Agram, Nacira; Øksendal, Bernt & Yakhlef, Samia (2018). Optimal control of forward-backward stochastic Volterra equations, In  Non-linear Partial Differential Equations, Mathematical Physics, and Stochastic Analysis: The Helge Holden Anniversary Volume.  European Mathematical Society Publishing House.  ISBN 978-3-03719-186-6.  Artikkel 3.  s 3 - 36
• Biagini, Francesca; Meyer-Brandis, Thilo; Øksendal, Bernt & Paczka, Krzysztof Jaroslaw (2018). Optimal control with delayed information flow of systems driven by G-Brownian motion. Probability, Uncertainty and Quantitative Risk.  ISSN 2367-0126.
• Draouil, Olfa & Øksendal, Bernt (2018). Optimal insider control of stochastic partial differential equations. Stochastics and Dynamics.  ISSN 0219-4937.  18(1) . doi: 10.1142/S0219493718500144 Full text in Research Archive.
• Dumitrescu, Roxana; Øksendal, Bernt & Sulem, Agnès (2018). Stochastic Control for Mean-Field Stochastic Partial Differential Equations with Jumps. Journal of Optimization Theory and Applications.  ISSN 0022-3239.  176(3), s 559- 584 . doi: 10.1007/s10957-018-1243-3
• Hu, Yaozhong & Øksendal, Bernt (2018). Linear Volterra backward stochastic integral equations. Stochastic Processes and their Applications.  ISSN 0304-4149.  129(2), s 626- 633 . doi: 10.1016/j.spa.2018.03.016
• Øksendal, Bernt; Sulem, Agnès & Dumitrescu, Roxana (2018). Stochastic control of general mean-field SPDEs with jumps. Journal of Optimization Theory and Applications.  ISSN 0022-3239.  176(3), s 559- 584
• Agram, Nacira & Øksendal, Bernt (2017). Stochastic control of memory mean-field processes. Applied mathematics and optimization.  ISSN 0095-4616.  s 1- 24 . doi: 10.1007/s00245-017-9425-1 Full text in Research Archive.
• Agram, Nacira; Øksendal, Bernt & Yakhlef, Samia (2017). New approach to optimal control of stochastic Volterra integral equations. arXiv.org.  ISSN 2331-8422.  s 1- 22 . doi: 10.1080/17442508.2018.1557186
• Dahl, Kristina Rognlien & Øksendal, Bernt (2017). Singular recursive utility. Stochastics: An International Journal of Probability and Stochastic Processes.  ISSN 1744-2508.  89(6-7), s 994- 1014 . doi: 10.1080/17442508.2017.1303067 Full text in Research Archive.
• Hu, Yaozhong; Øksendal, Bernt & Sulem, Agnes Biacobroda (2017). Singular mean-field control games. Stochastic Analysis and Applications.  ISSN 0736-2994.  35(5), s 823- 851 . doi: 10.1080/07362994.2017.1325745 Full text in Research Archive.
• Øksendal, Bernt & Røse, Elin Engen (2017). A white noise approach to insider trading, In Takeyuki Hida & Ludwig Streit (ed.),  Let Us Use White Noise.  World Scientific.  ISBN 978-981-3220-93-5.  Kapittel 6.  s 191 - 204 Full text in Research Archive. Show summary

  We present a new approach to the optimal portfolio problem for an insider with logarithmic utility. Our method is based on white noise theory, stochastic forward integrals, Hida-Malliavin calculus and the Donsker delta function.

• Agram, Nacira & Øksendal, Bernt (2016). Model Uncertainty Stochastic Mean-Field Control. arXiv.org.  ISSN 2331-8422.
• Agram, Nacira; Øksendal, Bernt & Yakhlef, Samia (2016). Optimal control of forward-backward stochastic Volterra equations. arXiv.org.  ISSN 2331-8422.
• Alvarez, Luis H.; Lungu, Edward & Øksendal, Bernt (2016). Optimal multi-dimensional stochastic harvesting with density-dependent prices. Afrika Matematika.  ISSN 1012-9405.  27(3), s 427- 442 . doi: 10.1007/s13370-015-0357-0 Full text in Research Archive.
• Dahl, Kristina Rognlien; Mohammed, Salah-Eldin; Øksendal, Bernt & Røse, Elin Engen (2016). Optimal control of systems with noisy memory and BSDEs with Malliavin derivatives. Journal of Functional Analysis.  ISSN 0022-1236.  271(2), s 289- 329 . doi: 10.1016/j.jfa.2016.04.031 Full text in Research Archive.
• Draouil, Olfa & Øksendal, Bernt (2016). Optimal insider control and semimartingale decompositions under enlargement of filtration. Stochastic Analysis and Applications.  ISSN 0736-2994.  34(6), s 1045- 1056 . doi: 10.1080/07362994.2016.1200989 Full text in Research Archive.
• Draouil, Olfa & Øksendal, Bernt (2016). Stochastic differential games with inside information. Infinite Dimensional Analysis Quantum Probability and Related Topics.  ISSN 0219-0257.  19(3) . doi: 10.1142/S0219025716500168 Full text in Research Archive.
• Øksendal, Bernt & Sulem, Agnès (2016). Dynamic robust duality in utility maximization. Applied mathematics and optimization.  ISSN 0095-4616.  s 1- 31 . doi: 10.1007/s00245-016-9329-5 Full text in Research Archive.
• Øksendal, Bernt & Sulem, Agnès (2016). Optimal control of predictive mean-field equations and applications to finance. Springer Proceedings in Mathematics & statistics.  ISSN 2194-1009.  138, s 301- 320 . doi: 10.1007/978-3-319-23425-0_12 Full text in Research Archive. Show summary

  We study a coupled system of controlled stochastic differential equations (SDEs) driven by a Brownian motion and a compensated Poisson random measure, consisting of a forward SDE in the unknown process X(t) and a predictive mean-field backward SDE (BSDE) in the unknowns Y(t),Z(t),K(t,⋅). The driver of the BSDE at time t may depend not just upon the unknown processes Y(t),Z(t),K(t,⋅), but also on the predicted future value Y(t+δ), defined by the conditional expectation A(t):=E[Y(t+δ)|Ft]. We give a sufficient and a necessary maximum principle for the optimal control of such systems, and then we apply these results to the following two problems: (i) Optimal portfolio in a financial market with an insider influenced asset price process. (ii) Optimal consumption rate from a cash flow modeled as a geometric Itô-Lévy SDE, with respect to predictive recursive utility.

• Øksendal, Bernt; Sulem, Agnes Biacobroda & Zhang, Tusheng (2016). A stochastic HJB equation for optimal control of forward-backward SDEs, In Mark Podolskij; Robert Stelzer; Steen Thorbjørnsen & Almut E. D. Veraart (ed.),  The Fascination of Probability, Statistics and their Applications. In honour of Ole E. Barndorff-Nielsen.  Springer Science+Business Media B.V..  ISBN 978-3-319-25824-9.  Kapittel 20.  s 435 - 446 Show summary

  We study optimal stochastic control problems of general coupled systems of forward-backward stochastic differential equations with jumps. By means of the Itô-Ventzell formula, the system is transformed into a controlled backward stochastic partial differential equation. Using a comparison principle for such equations we obtain a general stochastic Hamilton-Jacobi-Bellman (HJB) equation for the value function of the control problem. In the case of Markovian optimal control of jump diffusions, this equation reduces to the classical HJB equation. The results are applied to study risk minimization in financial markets.

• Agram, Nacira & Øksendal, Bernt (2015). Malliavin Calculus and Optimal Control of Stochastic Volterra Equations. Journal of Optimization Theory and Applications.  ISSN 0022-3239.  167(3), s 1070- 1094 . doi: 10.1007/s10957-015-0753-5 Full text in Research Archive.
• Draouil, Olfa & Øksendal, Bernt (2015). A Donsker delta functional approach to optimal insider control and applications to finance. Communications in Mathematics and Statistics.  ISSN 2194-6701.  3(3), s 365- 421 . doi: 10.1007/s40304-015-0065-y Full text in Research Archive.
• Øksendal, Bernt & Sulem, Agnes Biacobroda (2015). Risk minimization in financial markets modeled by Itô-Lévy processes. Afrika Matematika.  ISSN 1012-9405.  26(5-6), s 939- 979 . doi: 10.1007/s13370-014-0248-9 Full text in Research Archive.
• Agram, Nacira & Øksendal, Bernt (2014). Infinite horizon optimal control of forward-backward stochastic differential equations with delay. Journal of Computational and Applied Mathematics.  ISSN 0377-0427.  259, s 336- 349 . doi: 10.1016/j.cam.2013.04.048 Full text in Research Archive.
• Corcuera, Jose Manuel; Di Nunno, Giulia; Farkas, Gergely & Øksendal, Bernt (2014). A continuous auction model with insiders and random time of information release. Preprint series (Universitetet i Oslo. Matematisk institutt).  ISSN 0806-2439.  (3) Full text in Research Archive.
• Fontana, Claudio; Øksendal, Bernt & Sulem, Agnes Biacobroda (2014). Market Viability and Martingale Measures under Partial Information. Methodology and Computing in Applied Probability.  ISSN 1387-5841. Full text in Research Archive.
• Øksendal, Bernt; Sandal, Leif Kristoffer & Ubøe, Jan (2014). Stackelberg equilibria in a continuous-time vertical contracting model with uncertain demand and delayed information. Journal of Applied Probability.  ISSN 0021-9002.  51A, s 213- 226 . doi: 10.1239/jap/1417528477 Full text in Research Archive.
• Øksendal, Bernt & Sulem, Agnès (2014). Forward-Backward Stochastic Differential Games and Stochastic Control under Model Uncertainty. Journal of Optimization Theory and Applications.  ISSN 0022-3239.  161(1), s 22- 55 . doi: 10.1007/s10957-012-0166-7 Full text in Research Archive.
• Øksendal, Bernt & Sulem, Agnes Biacobroda (2014). Stochastic control of Itô-Lévy processes with applications to finance. Communications on Stochastic Analysis.  ISSN 0973-9599.  8(1), s 1- 15 Full text in Research Archive.
• Øksendal, Bernt; Sulem, Agnès & Zhang, Tusheng (2014). Singular control and optimal stopping of SPDEs, and backward SPDEs with reflection. Mathematics of Operations Research.  ISSN 0364-765X.  39(2), s 464- 486 . doi: 10.1287/moor.2013.0602 Full text in Research Archive.
• Agram, Nacira; Haadem, Sven; Øksendal, Bernt & Proske, Frank Norbert (2013). A maximum principle for infinite horizon delay equatations. SIAM Journal on Mathematical Analysis.  ISSN 0036-1410.  45(4), s 2499- 2522 . doi: 10.1137/120882809 Full text in Research Archive.
• Agram, Nacira; Haadem, Sven; Øksendal, Bernt & Proske, Frank Norbert (2013). A maximum principle for infinite horizon delay equations. SIAM Journal on Mathematical Analysis.  ISSN 0036-1410.  45, s 2499- 2522 . doi: 10.1137/120882809
• Agram, Nacira & Øksendal, Bernt (2013). Infinite horizon optimal control of forward-backward stochastic differential equations with delay. Preprint series (Universitetet i Oslo. Matematisk institutt).  ISSN 0806-2439. Full text in Research Archive.
• Baghery, Fouzia; Haadem, Sven; Øksendal, Bernt & Turpin, Isabella (2013). Optimal stopping and stochastic control differential games for jump diffusions. Stochastics: An International Journal of Probability and Stochastic Processes.  ISSN 1744-2508.  85(1), s 85- 97 . doi: 10.1080/17442508.2011.652116 Full text in Research Archive.
• Haadem, Sven; Øksendal, Bernt & Proske, Frank Norbert (2013). Maximum principles for jump diffusion processes with infinite horizon. Automatica.  ISSN 0005-1098.  49(7), s 2267- 2275 . doi: 10.1016/j.automatica.2013.04.011 Full text in Research Archive.
• Siegmund-Schultze, Reinhard & Øksendal, Bernt (2013). Johannes Lohne (1908-1993), den glemte norske nyoppdager av Thomas Harriot og frontkjemper for den tyske okkupasjonsmakten under 2. verdenskrig. Normat.  ISSN 0801-3500.  61(1), s 18- 32
• Øksendal, Bernt; Sandal, Leif Kristoffer & Ubøe, Jan (2013). Stochastic Stackelberg equilibria with applications to time-dependent newsvendor models. Journal of Economic Dynamics and Control.  ISSN 0165-1889.  37(7), s 1284- 1299 . doi: 10.1016/j.jedc.2013.02.010 Full text in Research Archive.
• Øksendal, Bernt & Sulem, Agnès (2013). A stochastic control approach to robust duality in utility maximization. Preprint series (Universitetet i Oslo. Matematisk institutt).  ISSN 0806-2439. Full text in Research Archive.
• Øksendal, Bernt; Sulem, Agnès & Zhang, Tusheng (2013). A stochastic HJB equation for optimal control of forward-backward SDEs. Preprint series (Universitetet i Oslo. Matematisk institutt).  ISSN 0806-2439. Full text in Research Archive.
• Aase, Knut; Bjuland, Terje & Øksendal, Bernt (2012). Partially informed noise traders. Mathematics and Financial Economics.  ISSN 1862-9679.  6(2), s 93- 104 . doi: 10.1007/s11579-012-0075-4 Full text in Research Archive. Show summary

  The single auction equilibrium of Kyle’s (1985) is studied, in which noise traders may be partially informed, or alternatively they can be manipulated. Unlike Kyle’s assumption that the quantity traded by the noise traders is independent of the asset value, we assume that the noise traders are able to correlate their trade with the true price. This has several implications for the equilibrium, one being that the informed trader’s expected profits decrease as the noise traders’ ability to correlate positively improve. In the limit, the noise traders do not lose on average, and the informed trader makes zero expected profits. When the correlation is negative, we interpret this as manipulation. In this case the insider makes the highest expected profits, and the informativeness of prices is at its minimum.

• Aase, Knut; Bjuland, Terje & Øksendal, Bernt (2012). Strategic insider trading equilibrium: A filter theory approach. Afrika Matematika.  ISSN 1012-9405.  23(2), s 145- 162 . doi: 10.1007/s13370-011-0026-x Full text in Research Archive. Show summary

  The continuous-time version of Kyle’s (Econometrica 53(6):1315–1336, 1985) model of asset pricing with asymmetric information is studied, and generalized in various directions, i.e., by allowing time-varying liquidity trading, and by having weaker a priori assumptions on the model. This extension is made possible by the use of filtering theory. We derive the optimal trade for an insider and the corresponding price of the risky asset; the insider’s trading intensity satisfies a deterministic integral equation, given perfect inside information.

• Agram, Nacira; Haadem, Sven; Øksendal, Bernt & Proske, Frank Norbert (2012). A MAXIMUM PRINCIPLE FOR INFINITE HORIZON DELAY EQUATIONS. Preprint series (Universitetet i Oslo. Matematisk institutt).  ISSN 0806-2439.  4 Full text in Research Archive.
• Haadem, Sven; Øksendal, Bernt & Proske, Frank Norbert (2012). Maximum principles for jump diffusion processes with infinite horizon. Preprint series (Universitetet i Oslo. Matematisk institutt).  ISSN 0806-2439.  April(3) Full text in Research Archive.
• Meyer-Brandis, Thilo; Hu, Yaozhong; Øksendal, Bernt & Biagini, Francesca (2012). Insider trading equilibrium in a market with memory. Mathematics and Financial Economics.  ISSN 1862-9679.  6, s 229- 247
• Meyer-Brandis, Thilo; Øksendal, Bernt & Zhou, Xunyu (2012). A mean-field stochastic maximum principle via Malliavin calculus. Stochastics: An International Journal of Probability and Stochastic Processes.  ISSN 1744-2508.  84(5-6), s 643- 666 . doi: 10.1080/17442508.2011.651619
• Øksendal, Bernt & Sulem, Agnes (2012). Singular stochastic control and optimal stopping with partial information of itô-lévy processes. SIAM Journal of Control and Optimization.  ISSN 0363-0129.  50(4), s 2254- 2287 . doi: 10.1137/100793931 Full text in Research Archive.
• Øksendal, Bernt; Sulem, Agnès & Zhang, Tusheng (2012). Optimal partial information control of SPDEs with delay and time-advanced backward SPDEs, In Tusheng Zhang & Xunyu Zhou (ed.),  Stochastic Analysis and Applications to Finance.  World Scientific.  ISBN 978-981-4383-57-8.  Artikkel.
• Øksendal, Bernt & Ta, An Thi Kieu (2012). A maximum principle for stochastic differential games with g-expectations and partial information. Stochastics: An International Journal of Probability and Stochastic Processes.  ISSN 1744-2508.  84(2-3), s 137- 155 . doi: 10.1080/17442508.2010.532875 Full text in Research Archive.
• Øksendal, Bernt & Zhang, Tusheng (2012). Backward stochastic differential equations with respect to general filtrations and applications to insider finance. Communications on Stochastic Analysis.  ISSN 0973-9599.  6(4), s 703- 722 Full text in Research Archive.
• Aase, Knut Kristian; Bjuland, Terje & Øksendal, Bernt (2011). An anticipative linear filtering equation. Systems & control letters (Print).  ISSN 0167-6911.  60(7), s 468- 471 . doi: 10.1016/j.sysconle.2011.04.001
• Aase, Knut Kristian; Bjuland, Terje & Øksendal, Bernt (2011). Insider trading with partially informed traders. Preprint series (Universitetet i Oslo. Matematisk institutt).  ISSN 0806-2439.  (16) Full text in Research Archive.
• Baghery, Fouzia; Haadem, Sven; Turpin, Isabella & Øksendal, Bernt (2011). Optimal stopping and stochastic control differential games for jump diffusions. Stochastics: An International Journal of Probability and Stochastic Processes.  ISSN 1744-2508. . doi: 10.1080/17442508.2011.652116
• Di Nunno, Giulia; Pamen, Olivier Menoukeu; Øksendal, Bernt & Proske, Frank Norbert (2011). A general maximum principle for anticipative stochastic control and applications to insider trading, In Giulia Di Nunno & Bernt Øksendal (ed.),  Advanced Mathematical Methods for Finance.  Springer.  ISBN 978-3-642-18411-6.  Chapter.  s 181 - 221
• Di Nunno, Giulia; Øksendal, Bernt; Menoukeu Pamen, Olivier & Proske, Frank Norbert (2011). Uniqueness of Decompositions of Skorohod-Semimartingales. Infinite Dimensional Analysis Quantum Probability and Related Topics.  ISSN 0219-0257.  14(1), s 15- 24 . doi: 10.1142/S0219025711004274
• Federico, Salvatore & Øksendal, Bernt (2011). Optimal stopping of stochastic differential equations with delay driven by Lévy noise. Potential Analysis.  ISSN 0926-2601.  34(2), s 181- 198 . doi: 10.1007/s11118-010-9187-8
• Øksendal, Bernt; Aase, Knut & Bjuland, Terje (2011). Strategic insider trading equilibrium: A filter theory approach. Afrika Matematika.  ISSN 1012-9405.  23(2), s 145- 162 . doi: 10.1007/s13370-011-0026-x Show summary

  The continuous-time version of Kyle’s (Econometrica 53(6):1315–1336, 1985) model of asset pricing with asymmetric information is studied, and generalized in various directions, i.e., by allowing time-varying liquidity trading, and by having weaker a priori assumptions on the model. This extension is made possible by the use of filtering theory. We derive the optimal trade for an insider and the corresponding price of the risky asset; the insider’s trading intensity satisfies a deterministic integral equation, given perfect inside information.

• Øksendal, Bernt; Sandal, Leif Kristoffer & Ubøe, Jan (2011). Stochastic Stackelberg equilibria with applications to time dependent newsvendor models. Preprint series (Universitetet i Oslo. Matematisk institutt).  ISSN 0806-2439. Full text in Research Archive.
• Øksendal, Bernt & Sulem, Agnès (2011). Portfolio optimization under model uncertainty and BSDE games. Quantitative finance (Print).  ISSN 1469-7688.  11(11), s 1665- 1674 . doi: 10.1080/14697688.2011.615219
• Øksendal, Bernt & Sulem, Agnès (2011). Robust stochastic control and equivalent martingale measures, In Arturo Kohatsu-Higa; Nicolas Privault & Shuenn-Jyi Sheu (ed.),  Stochastic Analysis with Financial Applications Hong Kong 2009.  Springer.  ISBN 978-3-0348-0096-9.  part 1 - Bidrag til Vol.65 i serien "Progress in Probability".  s 179 - 189
• Øksendal, Bernt; Sulem, Agnes & Zhang, Tusheng (2011). OPTIMAL CONTROL OF STOCHASTIC DELAY EQUATIONS AND TIME-ADVANCED BACKWARD STOCHASTIC DIFFERENTIAL EQUATIONS. Advances in Applied Probability.  ISSN 0001-8678.  43(2), s 572- 596

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• Di Nunno, Giulia & Øksendal, Bernt (ed.) (2011). Advanced Mathematical Methods for Finance. Springer.  ISBN 978-3-642-18411-6.  536 s.
• Di Nunno, Giulia & Øksendal, Bernt (ed.) (2011). Advanced Mathematical Methods for Finance. Springer.  ISBN 978-3-642-18411-6.  536 s.

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• Aase, Knut Kristian & Øksendal, Bernt (2019). Strategic Insider Trading Equilibrium with a non-fiduciary market maker. Norges Handelshoeyskole. Institutt for Foretaksoekonomi. Discussion Paper. 2. Show summary

  The continuous-time version of Kyle's (1985) model is studied, in which market makers are not fiduciaries. They have some market power which they utilize to set the price to their advantage, resulting in positive expected profits. This has several implications for the equilibrium, the most important being that by setting a modest fee conditional of the order ow, the market maker is able to obtain a profit of the order of magnitude, and even better than, a perfectly informed insider. Our model also indicates why speculative prices are more volatile than predicted by fundamentals.

• Aase, Knut Kristian & Øksendal, Bernt (2019). Strategic Insider Trading in Continuous Time: A New Approach. Norges Handelshoeyskole. Institutt for Foretaksoekonomi. Discussion Paper. 3. Show summary

  The continuous-time version of Kyle's (1985) model of asset pricing with asymmetric information is studied, and generalized by allowing time-varying noise trading. From rather simple assumptions we are able to derive the optimal trade for an insider; the trading intensity satisfies a deterministic integral equation, given perfect inside information, which we give a closed form solution to. We use a new technique called forward integration in order to find the optimal trading strategy. This is an extension of the stochastic integral which takes account of the informational asymmetry inherent in this problem. The market makers' price response is found by the use of filtering theory. The novelty is our approach, which could be extended in scope.

• Agram, Nacira & Øksendal, Bernt (2018). Correction to: Stochastic Control of Memory Mean-Field Processes. Applied mathematics and optimization.  ISSN 0095-4616.  79(1), s 205- 206 . doi: 10.1007/s00245-018-9483-z
• Øksendal, Bernt (2018). An Introduction to Stochastic Control, with Applications to Mathematical Finance.
• Øksendal, Bernt (2018). Introduction to Stochastic Control and applications.
• Øksendal, Bernt (2018). Introduction to Stochastic Control with Applications.
• Øksendal, Bernt (2018). Introduction to optimal stochastic control with inside information.
• Øksendal, Bernt (2018). Introduction to stochastic control with jump diffusions and applications to finance.
• Øksendal, Bernt (2018). Model uncertainty stochastic mean-field control.
• Øksendal, Bernt (2018). New approach to optimal control of stochastic Volterra equations.
• Øksendal, Bernt (2018). Optimal control of mean-field stochastic differential equations.
• Øksendal, Bernt (2018). Optimal control of stochastic Volterra equations.
• Øksendal, Bernt (2018). SPDEs with space - mean dynamics.
• Øksendal, Bernt (2017). Optimal control of mean-field systems with memory.
• Øksendal, Bernt (2017). Optimal control of mean-field systems with memory.
• Dahl, Kristina Rognlien & Øksendal, Bernt (2015). Singular recursive utility.
• Øksendal, Bernt & Sulem, Agnès (2015). Applications of stochastic analysis, In Nicholas J. Higham (ed.),  The Princeton Companion to Applied Mathematics.  Princeton University Press.  ISBN 978-0-691-15039-0.  IV.14.  s 319 - 327
• Dahl, Kristina Rognlien; Øksendal, Bernt; Røse, Elin Engen & Mohammed, Salah-Eldin (2014). Optimal control of systems with noisy memory and BSDEs with Malliavin derivatives.
• Øksendal, Bernt; Sulem, Agnès & Zhang, Tusheng (2014). A comparison theorem for backward SPDEs with jumps.
• Øksendal, Bernt; Sulem, Agnès & Zhang, Tusheng (2014). A comparison theorem for backward SPDEs with jumps.
• Aase, Knut; Bjuland, Terje & Øksendal, Bernt (2011). Insider trading with partially informed traders. Norges Handelshoeyskole. Institutt for Foretaksoekonomi. Discussion Paper. 21. Show summary

  The single auction equilibrium of Kyle's (1985) is studied, in which noise traders may be partially informed, or alternatively they can be manipulated. Unlike Kyle's assumption that the quantity traded by the noise traders is independent of the asset value, we assume that the noise traders are able to correlate their trade with the true price. This has several implications for the equilibrium, one being that the insider's expected profits decrease as the noise traders' ability to correlate positively improve. In the limit, the noise traders do not lose on average, and the insider makes zero expected profits. When the correlation is negative, we interpret this as manipulation. In this case the insider makes the highest expected profits, and the informativeness of prices is at its minimum.

• Biagini, Francesca; Meyer-Brandis, Thilo; Hu, Yaozhong & Øksendal, Bernt (2011). Insider trading equilibrium in a market with memory. Preprint series (Universitetet i Oslo. Matematisk institutt). 2011/7. Full text in Research Archive.
• Øksendal, Bernt (2011). Mathematics and Finance: The Black-Scholes Option Pricing Formula and Beyond. Preprint series: Pure mathematics. 11. Full text in Research Archive.
• Øksendal, Bernt; Sandal, Leif Kristoffer & Ubøe, Jan (2011). Stochastic Stackelberg equilibria with applications to time dependent newsvendor models. Norges Handelshoeyskole. Institutt for Foretaksoekonomi. Discussion Paper. 9. Show summary

  In this paper we prove a sufficient maximum principle for general stochastic differential Stackelberg games, and apply the theory to continuous time newsvendor problems. In the newsvendor problem a manufacturer sells goods to a retailer, and the objective of both parties is to maximize expected profits under a random demand rate. Our demand rate is an Ito-Levy process, and to increase realism information is delayed, e.g., due to production time. We provide complete existence and uniqueness proofs for a series of special cases, including geometric Brownian motion and the Ornstein-Uhlenbeck process, both with time variable coefficients. Moreover, these results are operational because we are able to offer explicit solution formulas. An interesting finding is that more precise information may be a considerable disadvantage for the retailer.

• Øksendal, Bernt & Sulem, Agnès (2011). Forward-backward SDE games and stochastic control under model uncertainty. Preprint series (Universitetet i Oslo. Matematisk institutt). August 2011. Full text in Research Archive.
• Øksendal, Bernt & Sulem, Agnès (2011). Portfolio optimization under model uncertainty and BSDE games. Preprint series: Pure mathematics. 1. Full text in Research Archive.

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