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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
THR
10301
DELISTED
Thermon Group Holdings
THR
– –
-3,196
Closed -$161K
THRY icon
10302
Thryv Holdings
THRY
$92.4M
– –
-74,645
Closed -$265K
TILE icon
10303
PUT
Interface
TILE
$2.15B
– –
-1,000
Closed -$24.9K
TLS icon
10304
Telos
TLS
$359M
– –
-24,855
Closed -$110K
TM icon
10305
Toyota
TM
$233B
– –
-4,231
Closed -$801K
TLYS icon
10306
Tilly's
TLYS
$135M
– –
-1,451
Closed -$6.56K
TMHC
10307
DELISTED
Taylor Morrison
TMHC
– –
-424
Closed -$26.9K
TMP icon
10308
CALL
Tompkins Financial
TMP
$1.43B
– –
-100
Closed -$7.88K
TNDM icon
10309
Tandem Diabetes Care
TNDM
$1.38B
– –
-2,903
Closed -$50.7K
TNGX icon
10310
PUT
Tango Therapeutics
TNGX
$3.8B
– –
-800
Closed -$16.7K
TNK icon
10311
PUT
Teekay Tankers
TNK
$3.24B
– –
-700
Closed -$51.3K
TNXP icon
10312
Tonix Pharmaceuticals
TNXP
$225M
– –
-5,108
Closed -$65.9K
TOKE
10313
DELISTED
Cambria Cannabis ETF
TOKE
– –
-1,908
Closed -$9.75K
TOL icon
10314
Toll Brothers
TOL
$13.1B
– –
-3,671
Closed -$522K
TOUR
10315
PUT
Tuniu
TOUR
$54.8M
– –
-300
Closed -$2.31K
TPB icon
10316
CALL
Turning Point Brands
TPB
$1.51B
– –
-8,000
Closed -$694K
TPH
10317
CALL
DELISTED
Tri Pointe Homes
TPH
– –
-106,600
Closed -$4.98M
TPH
10318
PUT
DELISTED
Tri Pointe Homes
TPH
– –
-5,300
Closed -$248K
TPOR icon
10319
Direxion Daily Transportation Bull 3X ETF
TPOR
$16.8M
– –
-730
Closed -$20.5K
TREX icon
10320
Trex
TREX
$4.65B
– –
-25,372
Closed -$1.05M
TRFK icon
10321
Pacer Data and Digital Revolution ETF
TRFK
$1.07B
– –
-195
Closed -$12.1K
TRI icon
10322
Thomson Reuters
TRI
$45.8B
– –
-4,127
Closed -$360K
TRMD icon
10323
TORM
TRMD
$3.6B
– –
-44,157
Closed -$1.34M
TRN icon
10324
Trinity Industries
TRN
$2.26B
– –
-368
Closed -$12.4K
TRNO icon
10325
CALL
Terreno Realty
TRNO
$7.15B
– –
-100
Closed -$6.14K
411 412
413
414 415

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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.