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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
ADPT icon
9176
Adaptive Biotechnologies
ADPT
$3.87B
– –
-86
Closed -$1.32K
ADSE icon
9177
ADS-TEC Energy
ADSE
$869M
– –
-36
Closed -$416
ADT icon
9178
ADT
ADT
$5.45B
– –
-30,113
Closed -$207K
ADV icon
9179
CALL
Advantage Solutions
ADV
$403M
– –
-2,200
Closed -$46.5K
ADV icon
9180
Advantage Solutions
ADV
$403M
– –
-2,074
Closed -$43.8K
AEG icon
9181
PUT
Aegon
AEG
$13.6B
– –
-100
Closed -$726
AFL icon
9182
Aflac
AFL
$58.8B
– –
-1,577
Closed -$182K
AGIO icon
9183
Agios Pharmaceuticals
AGIO
$1.98B
– –
-37,462
Closed -$1.14M
AGM icon
9184
Federal Agricultural Mortgage
AGM
$2.47B
– –
-142
Closed -$21.1K
AGO icon
9185
Assured Guaranty
AGO
$3.33B
– –
-2,283
Closed -$180K
AGYS icon
9186
Agilysys
AGYS
$3.14B
– –
-144
Closed -$11.1K
AIA icon
9187
iShares Asia 50 ETF
AIA
$5.38B
– –
-294
Closed -$31.2K
AIP icon
9188
Arteris
AIP
$1.05B
– –
-4,666
Closed -$149K
AIRR icon
9189
First Trust RBA American Industrial Renaissance ETF
AIRR
$9.49B
– –
-117
Closed -$13K
AKBA icon
9190
Akebia Therapeutics
AKBA
$270M
– –
-10,589
Closed -$12.6K
AL
9191
CALL
DELISTED
Air Lease Corp
AL
– –
-8,400
Closed -$545K
AL
9192
DELISTED
Air Lease Corp
AL
– –
-504
Closed -$32.7K
AL
9193
PUT
DELISTED
Air Lease Corp
AL
– –
-5,900
Closed -$383K
ALGM icon
9194
Allegro MicroSystems
ALGM
$6.82B
– –
-154
Closed -$7.21K
ALGT icon
9195
PUT
Allegiant Air
ALGT
$2.14B
– –
-700
Closed -$56.7K
ALLE icon
9196
PUT
Allegion
ALLE
$13.4B
– –
-1,000
Closed -$145K
ALLO icon
9197
Allogene Therapeutics
ALLO
$681M
– –
-53,282
Closed -$117K
ALLT icon
9198
Allot
ALLT
$374M
– –
-9,960
Closed -$74.1K
ALLY icon
9199
Ally Financial
ALLY
$13.3B
– –
-14,890
Closed -$646K
ALNT icon
9200
CALL
Allient
ALNT
$1.61B
– –
-100
Closed -$5.91K
366 367
368
369 370

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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.