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
PINE
10076
Alpine Income Property Trust
PINE
$346M
– –
-558
Closed -$10.8K
PJT icon
10077
CALL
PJT Partners
PJT
$4.67B
– –
-200
Closed -$27.9K
PKE icon
10078
CALL
Park Aerospace
PKE
$680M
– –
-700
Closed -$19.2K
PKST
10079
DELISTED
Peakstone Realty Trust
PKST
– –
-213
Closed -$4.45K
PKST
10080
PUT
DELISTED
Peakstone Realty Trust
PKST
– –
-400
Closed -$8.36K
PL icon
10081
Planet Labs
PL
$6.59B
– –
-4,254
Closed -$157K
PKX icon
10082
POSCO
PKX
$19B
– –
-608
Closed -$41.7K
PLMR icon
10083
CALL
Palomar
PLMR
$3.59B
– –
-1,000
Closed -$120K
PLOW icon
10084
Douglas Dynamics
PLOW
$976M
– –
-423
Closed -$19.5K
PLUS icon
10085
CALL
ePlus
PLUS
$2.4B
– –
-400
Closed -$30.1K
PLUS icon
10086
ePlus
PLUS
$2.4B
– –
-16
Closed -$1.2K
PLXS icon
10087
PUT
Plexus
PLXS
$6.56B
– –
-100
Closed -$20.3K
PMCB icon
10088
PharmaCyte Biotech
PMCB
$5.22M
– –
-19,940
Closed -$15K
PMVP icon
10089
PMV Pharmaceuticals
PMVP
$69M
– –
-8,181
Closed -$10.5K
PNC icon
10090
PNC Financial Services
PNC
$98B
– –
-1,663
Closed -$372K
PNFP icon
10091
PUT
Pinnacle Financial Partners Inc
PNFP
$15.3B
– –
-400
Closed -$34.5K
PNW icon
10092
Pinnacle West Capital
PNW
$11.8B
– –
-1,996
Closed -$204K
PPBT
10093
Purple Biotech
PPBT
$2.85M
– –
-597
Closed -$2.01K
PPBT
10094
PUT
Purple Biotech
PPBT
$2.85M
– –
-200
Closed -$808
PPG icon
10095
PPG Industries
PPG
$25B
– –
-13,615
Closed -$1.52M
PRA
10096
CALL
DELISTED
ProAssurance
PRA
– –
-1,600
Closed -$39.6K
PRA
10097
PUT
DELISTED
ProAssurance
PRA
– –
-4,300
Closed -$106K
PRAX icon
10098
Praxis Precision Medicines
PRAX
$9.82B
– –
-1,660
Closed -$525K
PRI icon
10099
PUT
Primerica
PRI
$9.1B
– –
-100
Closed -$25K
PROF
10100
Profound Medical
PROF
$252M
– –
-36,718
Closed -$247K
402 403
404
405 406

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.