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
CSGS
9426
PUT
DELISTED
CSG Systems International
CSGS
– –
-8,700
Closed -$695K
CSIQ icon
9427
Canadian Solar
CSIQ
$898M
– –
-46,543
Closed -$746K
CSR
9428
Centerspace
CSR
$888M
– –
-28
Closed -$1.61K
CSTE icon
9429
CALL
Caesarstone
CSTE
$103M
– –
-300
Closed -$321
CSV icon
9430
CALL
Carriage Services
CSV
$539M
– –
-400
Closed -$18.3K
CSX icon
9431
CSX Corp
CSX
$91.5B
– –
-32,947
Closed -$1.49M
CTEC icon
9432
Global X ClimateTech ETF
CTEC
$25.6M
– –
-7
Closed -$408
CTKB icon
9433
Cytek Biosciences
CTKB
$611M
– –
-3,226
Closed -$13.8K
CTKB icon
9434
PUT
Cytek Biosciences
CTKB
$611M
– –
-5,500
Closed -$24K
CTLP
9435
CALL
DELISTED
Cantaloupe
CTLP
– –
-7,000
Closed -$75.7K
CTLP
9436
PUT
DELISTED
Cantaloupe
CTLP
– –
-39,300
Closed -$425K
CTOS icon
9437
Custom Truck One Source
CTOS
$2.09B
– –
-633
Closed -$5.96K
CTOS icon
9438
PUT
Custom Truck One Source
CTOS
$2.09B
– –
-500
Closed -$3.29K
CTRA
9439
CALL
DELISTED
Coterra Energy
CTRA
– –
-65,200
Closed -$2.29M
CTRA
9440
DELISTED
Coterra Energy
CTRA
– –
-3,248
Closed -$114K
CTRA
9441
PUT
DELISTED
Coterra Energy
CTRA
– –
-47,500
Closed -$1.67M
CTRN icon
9442
Citi Trends
CTRN
$593M
– –
-4,375
Closed -$190K
CTS icon
9443
CTS Corp
CTS
$1.63B
– –
-79
Closed -$4.74K
CUBI icon
9444
Customers Bancorp
CUBI
$2.74B
– –
-734
Closed -$50.9K
CUBI icon
9445
PUT
Customers Bancorp
CUBI
$2.74B
– –
-3,300
Closed -$229K
CUE icon
9446
Cue Biopharma
CUE
$199M
– –
-29
Closed -$201
CUE icon
9447
PUT
Cue Biopharma
CUE
$199M
– –
-70
Closed -$482
CUK
9448
DELISTED
Carnival PLC
CUK
– –
-13,489
Closed -$348K
CUK
9449
PUT
DELISTED
Carnival PLC
CUK
– –
-15,000
Closed -$387K
CVBF icon
9450
CALL
CVB Financial
CVBF
$3.98B
– –
-100
Closed -$1.94K
376 377
378
379 380

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.