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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
-4.08%
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
$127B
AUM Growth
+$5.5B
Cap. Flow
+$559M
Cap. Flow %
0.44%
Top 10 Hldgs %
44.01%
Holding
10,417
New
1,401
Increased
3,688
Reduced
3,363
Closed
1,719

Top Buys

Rank Stock Value
1
AMZN icon
Amazon
AMZN
+$113M
2
GLD icon
SPDR Gold Trust
GLD
+$68.6M
3
NVDA icon
NVIDIA
NVDA
+$63.4M
4
TLT icon
iShares 20+ Year Treasury Bond ETF
TLT
+$55.2M
5
AAPL icon
Apple
AAPL
+$54.9M

Top Sells

Rank Stock Value
1
NFLX icon
Netflix
NFLX
+$27.1M
2
QCOM icon
Qualcomm
QCOM
+$24.6M
3
DIS icon
Walt Disney
DIS
+$21.2M
4
AMD icon
Advanced Micro Devices
AMD
+$18.2M
5
SNOW icon
Snowflake
SNOW
+$16.1M

Sector Composition

Rank Sector Weight
1 Miscellaneous 98.25%
2 Technology 0.44%
3 Consumer Discretionary 0.32%
4 Healthcare 0.22%
5 Financials 0.17%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
MRC
9376
PUT
DELISTED
MRC Global
MRC
– –
-6,100
Closed -$61K
MRCC
9377
CALL
DELISTED
Monroe Capital Corp
MRCC
– –
-1,000
Closed -$8K
MRCC
9378
PUT
DELISTED
Monroe Capital Corp
MRCC
– –
-1,600
Closed -$13K
MRSN
9379
PUT
DELISTED
Mersana Therapeutics
MRSN
– –
-1,524
Closed -$125K
MS icon
9380
Morgan Stanley
MS
$342B
– –
-11,678
Closed -$1.01M
MSA icon
9381
PUT
Mine Safety
MSA
$7.28B
– –
-200
Closed -$34K
MSEX icon
9382
PUT
Middlesex Water
MSEX
$1.1B
– –
-100
Closed -$8K
MSTB icon
9383
PUT
LHA Market State Tactical Beta ETF
MSTB
$199M
– –
-1,000
Closed -$10K
MTA
9384
Metalla Royalty & Streaming
MTA
$964M
– –
-608
Closed -$2.48K
MTA
9385
PUT
Metalla Royalty & Streaming
MTA
$964M
– –
-1,500
Closed -$6K
MTCH icon
9386
Match Group
MTCH
$9.61B
– –
-31,150
Closed -$1.38M
MTB icon
9387
M&T Bank
MTB
$34.6B
– –
-2,000
Closed -$261K
MTLS
9388
Materialise
MTLS
$432M
– –
-21,584
Closed -$155K
MTLS
9389
PUT
Materialise
MTLS
$432M
– –
-4,400
Closed -$38K
MU icon
9390
Micron Technology
MU
$1.15T
– –
-530
Closed -$35.5K
MWA icon
9391
CALL
Mueller Water Products
MWA
$3.74B
– –
-600
Closed -$9K
MX icon
9392
PUT
Magnachip Semiconductor
MX
$113M
– –
-4,900
Closed -$54K
MXL icon
9393
MaxLinear
MXL
$5.69B
– –
-78,618
Closed -$2M
MYE icon
9394
Myers Industries
MYE
$1.2B
– –
-1,135
Closed -$21.4K
MYGN icon
9395
PUT
Myriad Genetics
MYGN
$305M
– –
-100
Closed -$2K
MYPS icon
9396
PLAYSTUDIOS Inc
MYPS
$62.5M
– –
-18,990
Closed -$75.3K
MYRG icon
9397
MYR Group
MYRG
$4.46B
– –
-804
Closed -$114K
MYRG icon
9398
PUT
MYR Group
MYRG
$4.46B
– –
-1,100
Closed -$152K
NAUT icon
9399
PUT
Nautilus Biotechnolgy
NAUT
$115M
– –
-700
Closed -$2K
NCMI icon
9400
National CineMedia
NCMI
$233M
– –
-1,012
Closed -$4.01K
374 375
376
377 378

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Simplex Trading's Q3 2023 Portfolio in Review

As of Q3 2023, Simplex Trading held 10,417 positions worth $127B, up 4.5% from $122B the previous quarter. Its ten largest holdings account for 44% of the portfolio.

Simplex Trading's Q3 2023 filing shows 1,401 new, 3,688 increased, 3,363 reduced and 1,719 closed positions. Its largest new stake was Amazon: 841,102 shares worth $107M. The largest sale was Netflix, an estimated $27.1M.

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 Q3 2023 buy was Amazon: 841,102 shares worth $107M.
  • Simplex Trading added most to SPDR Gold Trust in Q3 2023, an estimated $68.6M increase.
  • Simplex Trading's biggest Q3 2023 reduction was Netflix, cutting an estimated $27.1M.
  • Simplex Trading fully exited Qualcomm in Q3 2023, selling an estimated $24.6M.
  • Simplex Trading's ten largest holdings make up 44% of its $127B portfolio in Q3 2023.
  • Simplex Trading opened 1,401 new positions and closed 1,719 in Q3 2023.
  • Simplex Trading's portfolio value rose 4.5% quarter-over-quarter to $127B.

Based on Simplex Trading's 13F filing for Q3 2023, filed 1 Nov 2023.