We are live on ! Find out more
Simplex Trading

Simplex Trading Portfolio holdings

AUM $171B
1-Year Est. Return 85%
 

Simplex Trading, founded in 2004 and headquartered in Chicago, Illinois, is a technology-driven proprietary trading firm specializing in market-making and liquidity provision, primarily in U.S. equity options and futures options. Leveraging advanced proprietary software and data-driven analysis, the firm optimizes trading strategies and develops innovative solutions to capitalize on financial market opportunities, maintaining a competitive edge through automation and a collaborative team of technologists and traders. With a workforce exceeding 300 and led by CEO Erik Swanson since 2014, Simplex operates with a low-ego, high-intelligence culture, focusing on minimal bureaucracy and rapid execution, while also making strategic venture capital investments in fintech startups. Recognized as a top workplace in Chicago by Built In’s 2025 awards, Simplex continues to evolve, blending cutting-edge technology with a commitment to market efficiency and growth.

This Fund
S&P 500
This Quarter Est. Return
+39.06%
1 Year Est. Return
+85%
3 Year Est. Return
+183.25%
5 Year Est. Return
+145.21%
10 Year Est. Return
+1,056.84%
AUM
$171B
AUM Growth
+$21.5B
Cap. Flow
-$29.5M
Cap. Flow %
-0.02%
Top 10 Hldgs %
49.56%
Holding
10,638
New
1,714
Increased
3,712
Reduced
3,486
Closed
1,487

Top Buys

Rank Stock Value
1
IWM icon
iShares Russell 2000 ETF
IWM
+$146M
2
TLT icon
iShares 20+ Year Treasury Bond ETF
TLT
+$108M
3
AAPL icon
Apple
AAPL
+$62.9M
4
TSLA icon
Tesla
TSLA
+$51.9M
5
MU icon
Micron Technology
MU
+$39.5M

Top Sells

Rank Stock Value
1
SPY icon
State Street SPDR S&P 500 ETF Trust
SPY
+$108M
2
META icon
Meta Platforms (Facebook)
META
+$104M
3
AMD icon
Advanced Micro Devices
AMD
+$92.1M
4
AMZN icon
Amazon
AMZN
+$90.3M
5
TSM icon
TSMC
TSM
+$82.9M

Sector Composition

Rank Sector Weight
1 Miscellaneous 98.28%
2 Technology 0.76%
3 Consumer Discretionary 0.21%
4 Communication Services 0.19%
5 Healthcare 0.15%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
INTC icon
9751
Intel
INTC
$506B
– –
-757,722
Closed -$76.6M
INTU icon
9752
Intuit
INTU
$91B
– –
-7,768
Closed -$2.71M
INTT icon
9753
inTEST
INTT
$143M
– –
-18,639
Closed -$316K
INTT icon
9754
PUT
inTEST
INTT
$143M
– –
-2,900
Closed -$39.6K
INVE icon
9755
CALL
Identive
INVE
$68.1M
– –
-3,300
Closed -$12.2K
INVE icon
9756
PUT
Identive
INVE
$68.1M
– –
-300
Closed -$1.11K
INVH icon
9757
Invitation Homes
INVH
$16.9B
– –
-26,711
Closed -$756K
INVZ icon
9758
Innoviz Technologies
INVZ
$103M
– –
-228,130
Closed -$156K
IONQ icon
9759
IonQ
IONQ
$16B
– –
-46,557
Closed -$2.36M
IPI icon
9760
Intrepid Potash
IPI
$545M
– –
-66
Closed -$2.51K
IPSC icon
9761
Century Therapeutics
IPSC
$382M
– –
-9,028
Closed -$20.6K
IREN icon
9762
Iris Energy
IREN
$17.6B
– –
-207,840
Closed -$10.8M
IRM icon
9763
Iron Mountain
IRM
$34.8B
– –
-14,800
Closed -$1.81M
IRON icon
9764
PUT
Disc Medicine
IRON
$3.04B
– –
-200
Closed -$12.8K
IRT icon
9765
CALL
Independence Realty Trust
IRT
$3.79B
– –
-400
Closed -$5.96K
IRWD icon
9766
Ironwood Pharmaceuticals
IRWD
$704M
– –
-17,724
Closed -$68.3K
ISPR icon
9767
CALL
Ispire Technology
ISPR
$88.4M
– –
-6,200
Closed -$11.4K
ISPR icon
9768
PUT
Ispire Technology
ISPR
$88.4M
– –
-400
Closed -$736
IA
9769
Innovative Solutions & Support
IA
$331M
– –
-31,723
Closed -$614K
ITB icon
9770
iShares US Home Construction ETF
ITB
$2.37B
– –
-43,132
Closed -$3.91M
ITT icon
9771
ITT
ITT
$18.3B
– –
-316
Closed -$63.9K
ITRI icon
9772
Itron
ITRI
$4.25B
– –
-5,259
Closed -$449K
ITUB icon
9773
Itaú Unibanco
ITUB
$89.8B
– –
-16,763
Closed -$139K
ITW icon
9774
Illinois Tool Works
ITW
$76.9B
– –
-1,679
Closed -$436K
IVLU icon
9775
iShares MSCI Intl Value Factor ETF
IVLU
$4.68B
– –
-93
Closed -$3.69K
389 390
391
392 393

Similar funds

Creative Planning
Creative Planning Overland Park, Kansas $171B AUM 24.68% 1-Year Est. Return
First Trust Advisors
First Trust Advisors Wheaton, Illinois $170B AUM 46.21% 1-Year Est. Return
Primecap Management
Primecap Management Pasadena, California $169B AUM 114.72% 1-Year Est. Return
Jennison Associates
Jennison Associates New York $167B AUM 44.17% 1-Year Est. Return
Sumitomo Mitsui Trust Group
Sumitomo Mitsui Trust Group Minato-Ku, Tokyo, Japan $175B AUM 40.63% 1-Year Est. Return
VanEck Associates
VanEck Associates New York $164B AUM 112.45% 1-Year Est. Return
California Public Employees Retirement System
California Public Employees Retirement System Sacramento, California $177B AUM 39.86% 1-Year Est. Return
Victory Capital Management
Victory Capital Management San Antonio, Texas $178B AUM 37.23% 1-Year Est. Return

Simplex Trading's Q2 2026 Portfolio in Review

As of Q2 2026, Simplex Trading held 10,638 positions worth $171B, up 14% from $149B the previous quarter. Its ten largest holdings account for 50% of the portfolio.

Simplex Trading's Q2 2026 filing shows 1,714 new, 3,712 increased, 3,486 reduced and 1,487 closed positions. Its largest new stake was Micron Technology: 52,682 shares worth $60.8M. The largest sale was State Street SPDR S&P 500 ETF Trust, an estimated $108M.

By sector, the portfolio is most concentrated in Miscellaneous at 98% of assets, down from 98% a quarter earlier, followed by Technology and Consumer Discretionary.

  • Simplex Trading's largest Q2 2026 buy was Micron Technology: 52,682 shares worth $60.8M.
  • Simplex Trading added most to iShares Russell 2000 ETF in Q2 2026, an estimated $146M increase.
  • Simplex Trading's biggest Q2 2026 reduction was State Street SPDR S&P 500 ETF Trust, cutting an estimated $108M.
  • Simplex Trading fully exited Intel in Q2 2026, selling an estimated $76.6M.
  • Simplex Trading's ten largest holdings make up 50% of its $171B portfolio in Q2 2026.
  • Simplex Trading opened 1,714 new positions and closed 1,487 in Q2 2026.
  • Simplex Trading's portfolio value rose 14% quarter-over-quarter to $171B.

Based on Simplex Trading's 13F filing for Q2 2026, filed 12 Aug 2026.