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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
NOTE
9976
CALL
DELISTED
FiscalNote
NOTE
– –
-1,300
Closed -$331
NOTE
9977
DELISTED
FiscalNote
NOTE
– –
-5,587
Closed -$1.42K
NOTE
9978
PUT
DELISTED
FiscalNote
NOTE
– –
-2,000
Closed -$510
NPO icon
9979
Enpro
NPO
$6.29B
– –
-48
Closed -$12K
NRC icon
9980
NRC Health Common Stock
NRC
$476M
– –
-498
Closed -$9.24K
NRC icon
9981
PUT
NRC Health Common Stock
NRC
$476M
– –
-4,500
Closed -$76.4K
NREF
9982
NexPoint Real Estate Finance
NREF
$335M
– –
-2
Closed -$30
NRIX icon
9983
Nurix Therapeutics
NRIX
$2.71B
– –
-8,113
Closed -$138K
NRP icon
9984
PUT
Natural Resource Partners
NRP
$1.51B
– –
-200
Closed -$24.2K
NSA
9985
CALL
DELISTED
National Storage Affiliates Trust
NSA
– –
-600
Closed -$22.6K
NSA
9986
PUT
DELISTED
National Storage Affiliates Trust
NSA
– –
-1,000
Closed -$37.7K
NSC icon
9987
Norfolk Southern
NSC
$74B
– –
-266
Closed -$82K
NSIT icon
9988
CALL
Insight Enterprises
NSIT
$4.72B
– –
-100
Closed -$6.7K
NSIT icon
9989
PUT
Insight Enterprises
NSIT
$4.72B
– –
-900
Closed -$60.3K
NSP icon
9990
Insperity
NSP
$1.98B
– –
-516
Closed -$16.9K
NTB icon
9991
CALL
Bank of N.T. Butterfield & Son
NTB
$2.42B
– –
-100
Closed -$5.25K
NTCT icon
9992
PUT
NETSCOUT
NTCT
$2.71B
– –
-11,500
Closed -$366K
NTGR icon
9993
NETGEAR
NTGR
$579M
– –
-5,976
Closed -$149K
NTNX icon
9994
Nutanix
NTNX
$18.4B
– –
-16,667
Closed -$753K
NTRS icon
9995
Northern Trust
NTRS
$34.1B
– –
-450
Closed -$74.1K
NTST
9996
NETSTREIT Corp
NTST
$2.04B
– –
-635
Closed -$12.9K
NU icon
9997
Nu Holdings
NU
$74.2B
– –
-234,510
Closed -$3.16M
NVCR icon
9998
NovoCure
NVCR
$2.09B
– –
-13,561
Closed -$205K
NVO
9999
Novo Nordisk
NVO
$206B
– –
-392,803
Closed -$16.9M
NWG icon
10000
PUT
NatWest
NWG
$75.2B
– –
-1,000
Closed -$14.9K
398 399
400
401 402

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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.