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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
DCGO icon
9476
PUT
DocGo
DCGO
$39.8M
– –
-100
Closed -$62
DCO icon
9477
CALL
Ducommun
DCO
$2.54B
– –
-700
Closed -$85.4K
DCTH icon
9478
Delcath Systems
DCTH
$572M
– –
-2,107
Closed -$23.3K
DDL
9479
PUT
Dingdong
DDL
$494M
– –
-48,200
Closed -$124K
DELL icon
9480
Dell
DELL
$339B
– –
-9,098
Closed -$2.63M
DFIC icon
9481
Dimensional International Core Equity 2 ETF
DFIC
$15.6B
– –
-1
Closed -$35
DFIN icon
9482
Donnelley Financial Solutions
DFIN
$1.25B
– –
-41
Closed -$1.93K
DFIN icon
9483
PUT
Donnelley Financial Solutions
DFIN
$1.25B
– –
-100
Closed -$4.71K
DGII icon
9484
CALL
Digi International
DGII
$2.63B
– –
-1,900
Closed -$91.6K
DH icon
9485
Definitive Healthcare
DH
$112M
– –
-46
Closed -$56
DHC
9486
PUT
Diversified Healthcare Trust
DHC
$1.82B
– –
-3,900
Closed -$25.9K
DHX icon
9487
CALL
DHI Group
DHX
$196M
– –
-2,900
Closed -$8.15K
DIN icon
9488
CALL
Dine Brands
DIN
$401M
– –
-200
Closed -$5.25K
DIN icon
9489
Dine Brands
DIN
$401M
– –
-2,104
Closed -$62.9K
DJP icon
9490
CALL
iPath Bloomberg Commodity Index Total Return ETN due 12 June 2036
DJP
$873M
– –
-1,000
Closed -$48.1K
DJP icon
9491
PUT
iPath Bloomberg Commodity Index Total Return ETN due 12 June 2036
DJP
$873M
– –
-800
Closed -$38.5K
DKL icon
9492
Delek Logistics
DKL
$3.22B
– –
-7,243
Closed -$368K
DLO icon
9493
dLocal
DLO
$4.57B
– –
-25,973
Closed -$330K
DLPN icon
9494
CALL
Dolphin Entertainment
DLPN
$15.4M
– –
-800
Closed -$1.18K
DLTH icon
9495
PUT
Duluth Holdings
DLTH
$172M
– –
-3,400
Closed -$10.7K
DNN icon
9496
Denison Mines
DNN
$3.1B
– –
-8,882
Closed -$31K
DOG
9497
ProShares Short Dow30
DOG
$102M
– –
-1,003
Closed -$24.5K
DOLE icon
9498
Dole
DOLE
$1.32B
– –
-4,010
Closed -$58.4K
DOMH icon
9499
PUT
Dominari Holdings
DOMH
$50.9M
– –
-1,200
Closed -$3.9K
DORM icon
9500
CALL
Dorman Products
DORM
$3.9B
– –
-100
Closed -$10.4K
378 379
380
381 382

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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.