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Simplex Trading

Simplex Trading Portfolio holdings

AUM $149B
1-Year Est. Return 62.07%
 

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
+62.07%
3 Year Est. Return
+116.86%
5 Year Est. Return
+116.02%
10 Year Est. Return
+774.44%
AUM
$175B
AUM Growth
+$18.5B
Cap. Flow
-$10.5B
Cap. Flow %
-6.03%
Top 10 Hldgs %
47.16%
Holding
10,048
New
1,525
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 Technology 0.74%
2 Communication Services 0.19%
3 Consumer Discretionary 0.18%
4 Healthcare 0.17%
5 Financials 0.14%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
MTLS
9351
Materialise
MTLS
$374M
– –
-12,646
Closed -$65.3K
MTUM icon
9352
iShares MSCI USA Momentum Factor ETF
MTUM
$26.1B
– –
-4,641
Closed -$938K
MTZ icon
9353
MasTec
MTZ
$28.1B
– –
-1,360
Closed -$196K
MUR icon
9354
Murphy Oil
MUR
$5.73B
– –
-20,156
Closed -$449K
MVIS icon
9355
Microvision
MVIS
$102M
– –
-146,897
Closed -$170K
MWA icon
9356
Mueller Water Products
MWA
$3.89B
– –
-1,321
Closed -$32.7K
MXCT icon
9357
CALL
MaxCyte
MXCT
$116M
– –
-600
Closed -$1K
MXCT icon
9358
MaxCyte
MXCT
$116M
$0 ﹤0.01%
+100
New +$242
MXL icon
9359
MaxLinear
MXL
$8.1B
– –
-4,138
Closed -$47.7K
MYE icon
9360
Myers Industries
MYE
$1.15B
– –
-3
Closed -$37
MYO icon
9361
Myomo
MYO
$39M
$0 ﹤0.01%
406
-12,886
-97% -$46.7K
MYRG icon
9362
PUT
MYR Group
MYRG
$6.31B
– –
-800
Closed -$90K
NABL icon
9363
N-able
NABL
$761M
– –
-12,175
Closed -$90.9K
NANC icon
9364
Unusual Whales Subversive Democratic Trading ETF
NANC
$273M
– –
-2,678
Closed -$96K
NANR icon
9365
State Street SPDR S&P North American Natural Resources ETF
NANR
$755M
– –
-135
Closed -$7K
NATR icon
9366
Nature's Sunshine
NATR
$356M
$0 ﹤0.01%
+20
New +$270
NAUT icon
9367
Nautilus Biotechnolgy
NAUT
$222M
$0 ﹤0.01%
+115
New +$86
NBBK icon
9368
CALL
NB Bancorp
NBBK
$985M
– –
-6,200
Closed -$112K
NDLS icon
9369
CALL
Noodles & Co
NDLS
$71.4M
– –
-488
Closed -$4K
NDSN icon
9370
CALL
Nordson
NDSN
$16.3B
– –
-1,100
Closed -$221K
NEGG icon
9371
Newegg Commerce
NEGG
$310M
– –
-1,145
Closed -$5K
NEGG icon
9372
PUT
Newegg Commerce
NEGG
$310M
– –
-155
Closed -$1K
NEU icon
9373
CALL
NewMarket
NEU
$7.03B
– –
-300
Closed -$169K
NEWP
9374
New Pacific Metals
NEWP
$822M
$0 ﹤0.01%
34
-7,922
-100% -$10K
NEXN
9375
Nexxen International
NEXN
$537M
– –
-243
Closed -$2.47K
373 374
375
376 377

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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 withdrew a net $10.5B in Q2 2025, closing 1,431 positions and reducing 3,590 holdings. Its most notable exit was Constellation Energy, an estimated $35.8M position sold in full.

By sector, the portfolio is most concentrated in Technology at 0.74% of assets, up from 0.41% a quarter earlier, followed by Communication Services and Consumer Discretionary.

Against the trend, Simplex Trading opened a new position in State Street SPDR S&P 500 ETF Trust worth $61.9M.

  • 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 1,525 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.