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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
+21.82%
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
$175B
AUM Growth
+$18.5B
Cap. Flow
+$450M
Cap. Flow %
0.26%
Top 10 Hldgs %
47.16%
Holding
10,048
New
1,524
Increased
3,308
Reduced
3,590
Closed
1,431

Top Buys

Rank Stock Value
1
NVDA icon
NVIDIA
NVDA
+$172M
2
AAPL icon
Apple
AAPL
+$156M
3
AVGO icon
Broadcom
AVGO
+$101M
4
SPY icon
State Street SPDR S&P 500 ETF Trust
SPY
+$57.2M
5
UNH icon
UnitedHealth
UNH
+$55.1M

Top Sells

Rank Stock Value
1
TLT icon
iShares 20+ Year Treasury Bond ETF
TLT
+$140M
2
AMZN icon
Amazon
AMZN
+$47.9M
3
NFLX icon
Netflix
NFLX
+$38.3M
4
TSM icon
TSMC
TSM
+$37.3M
5
PFE icon
Pfizer
PFE
+$36.9M

Sector Composition

Rank Sector Weight
1 Miscellaneous 98.27%
2 Technology 0.74%
3 Communication Services 0.19%
4 Consumer Discretionary 0.18%
5 Healthcare 0.17%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
MCHX icon
9301
Marchex
MCHX
$77.1M
– –
-2
Closed -$3
MCS icon
9302
CALL
Marcus Corp
MCS
$841M
– –
-1,000
Closed -$16K
MCS icon
9303
Marcus Corp
MCS
$841M
– –
-18
Closed –
MCS icon
9304
PUT
Marcus Corp
MCS
$841M
– –
-500
Closed -$8K
MCW
9305
DELISTED
Mister Car Wash
MCW
– –
-75,587
Closed -$596K
MDT icon
9306
Medtronic
MDT
$120B
– –
-3,774
Closed -$320K
MDU icon
9307
MDU Resources
MDU
$4.12B
– –
-4,383
Closed -$73.7K
MDU icon
9308
PUT
MDU Resources
MDU
$4.12B
– –
-900
Closed -$1K
MDYV icon
9309
State Street SPDR S&P 400 Mid Cap Value ETF
MDYV
$2.84B
– –
-45
Closed -$3K
ONT
9310
Onterris Inc
ONT
$627M
– –
-19,703
Closed -$353K
MERC icon
9311
Mercer International
MERC
$25.3M
– –
-18,057
Closed -$74.7K
MEXX icon
9312
Direxion Daily MSCI Mexico Bull 3X ETF
MEXX
$18M
– –
-3,443
Closed -$37K
MHK icon
9313
Mohawk Industries
MHK
$9.05B
– –
-4,427
Closed -$462K
KG
9314
Kestrel Group
KG
$59.3M
– –
-181
Closed -$2K
MHO icon
9315
M/I Homes
MHO
$3.75B
– –
-114
Closed -$12.4K
MIST icon
9316
Milestone Pharmaceuticals
MIST
$149M
– –
-40,636
Closed -$54.2K
MIRM icon
9317
PUT
Mirum Pharmaceuticals
MIRM
$6.15B
– –
-700
Closed -$31K
MITT
9318
PUT
TPG Mortgage Investment Trust
MITT
$216M
– –
-300
Closed -$2K
MKSI icon
9319
MKS Inc
MKSI
$17.6B
– –
-1,731
Closed -$141K
MKTW icon
9320
MarketWise
MKTW
$52.1M
– –
-917
Closed -$9K
MKTW icon
9321
PUT
MarketWise
MKTW
$52.1M
– –
-315
Closed -$12K
MLGO
9322
MicroAlgo
MLGO
$44M
– –
0
– –
MLI icon
9323
Mueller Industries
MLI
$14.1B
– –
-2,782
Closed -$105K
MLPA icon
9324
Global X MLP ETF
MLPA
$2.39B
– –
-30
Closed -$1K
MLPX icon
9325
Global X MLP & Energy Infrastructure ETF
MLPX
$3.67B
– –
-60
Closed -$3K
371 372
373
374 375

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Simplex Trading's Q2 2025 Portfolio in Review

As of Q2 2025, Simplex Trading held 10,048 positions worth $175B, up 12% from $156B the previous quarter. Its ten largest holdings account for 47% of the portfolio.

Simplex Trading's Q2 2025 filing shows 1,524 new, 3,308 increased, 3,590 reduced and 1,431 closed positions. Its largest new stake was State Street SPDR S&P 500 ETF Trust: 100,129 shares worth $61.9M. The largest sale was iShares 20+ Year Treasury Bond ETF, an estimated $140M.

By sector, the portfolio is most concentrated in Miscellaneous at 98% of assets, down from 99% a quarter earlier, followed by Technology and Communication Services.

  • Simplex Trading's largest Q2 2025 buy was State Street SPDR S&P 500 ETF Trust: 100,129 shares worth $61.9M.
  • Simplex Trading added most to NVIDIA in Q2 2025, an estimated $172M increase.
  • Simplex Trading's biggest Q2 2025 reduction was iShares 20+ Year Treasury Bond ETF, cutting an estimated $140M.
  • Simplex Trading fully exited Constellation Energy in Q2 2025, selling an estimated $35.8M.
  • Simplex Trading's ten largest holdings make up 47% of its $175B portfolio in Q2 2025.
  • Simplex Trading opened 1,524 new positions and closed 1,431 in Q2 2025.
  • Simplex Trading's portfolio value rose 12% quarter-over-quarter to $175B.

Based on Simplex Trading's 13F filing for Q2 2025, filed 5 Aug 2025.