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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
+6.46%
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
$122B
AUM Growth
+$7.84B
Cap. Flow
-$3.39B
Cap. Flow %
-2.78%
Top 10 Hldgs %
42.57%
Holding
10,535
New
1,474
Increased
3,350
Reduced
3,913
Closed
1,517

Top Buys

Rank Stock Value
1
MSFT icon
Microsoft
MSFT
+$53.9M
2
TLT icon
iShares 20+ Year Treasury Bond ETF
TLT
+$52.9M
3
NVDA icon
NVIDIA
NVDA
+$47.1M
4
PYPL icon
PayPal
PYPL
+$41.7M
5
GOOG icon
Alphabet (Google) Class C
GOOG
+$28.4M

Top Sells

Rank Stock Value
1
AAPL icon
Apple
AAPL
+$51.4M
2
WMT icon
Walmart Inc
WMT
+$46.4M
3
OIH icon
VanEck Oil Services ETF
OIH
+$34.2M
4
ADBE icon
Adobe
ADBE
+$33.5M
5
SBUX icon
Starbucks
SBUX
+$26.8M

Sector Composition

Rank Sector Weight
1 Technology 0.41%
2 Healthcare 0.21%
3 Consumer Discretionary 0.21%
4 Communication Services 0.2%
5 Financials 0.15%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
TLSA icon
9926
Tiziana Life Sciences
TLSA
$120M
$0 ﹤0.01%
+362
New +$306
TM icon
9927
Toyota
TM
$213B
– –
-3,957
Closed -$569K
TLYS icon
9928
CALL
Tilly's
TLYS
$116M
– –
-24,200
Closed -$186K
TMDX icon
9929
Transmedics
TMDX
$2.46B
– –
-7,094
Closed -$543K
TMO icon
9930
Thermo Fisher Scientific
TMO
$196B
– –
-100
Closed -$54K
TMQ
9931
Trilogy Metals
TMQ
$549M
$0 ﹤0.01%
+89
New +$50
TMV icon
9932
Direxion Daily 20+ Year Treasury Bear 3X ETF
TMV
$179M
– –
-19,896
Closed -$533K
TNA icon
9933
Direxion Daily Small Cap Bull 3x ETF
TNA
$1.38B
– –
-69,569
Closed -$2.24M
TNYA icon
9934
Tenaya Therapeutics
TNYA
$171M
– –
-9,813
Closed -$57K
TOL icon
9935
Toll Brothers
TOL
$13.9B
– –
-1,200
Closed -$80.5K
TOST icon
9936
Toast
TOST
$16.9B
– –
-11,366
Closed -$227K
TRAK icon
9937
ReposiTrak
TRAK
$146M
– –
-424
Closed -$3.19K
TRMB icon
9938
Trimble
TRMB
$11.7B
– –
-382
Closed -$18.7K
TRMK icon
9939
CALL
Trustmark
TRMK
$2.71B
– –
-200
Closed -$4K
TRMK icon
9940
Trustmark
TRMK
$2.71B
– –
-2,518
Closed -$62K
TRMK icon
9941
PUT
Trustmark
TRMK
$2.71B
– –
-3,200
Closed -$79K
TROX icon
9942
Tronox
TROX
$1.06B
– –
-859
Closed -$10.8K
TRS icon
9943
CALL
TriMas Corp
TRS
$1.43B
– –
-11,000
Closed -$306K
TRS icon
9944
PUT
TriMas Corp
TRS
$1.43B
– –
-500
Closed -$13K
TRTX
9945
TPG RE Finance Trust
TRTX
$670M
– –
-394
Closed -$2.67K
TRU icon
9946
TransUnion
TRU
$14.5B
– –
-36,304
Closed -$2.51M
TRUE
9947
DELISTED
TrueCar
TRUE
– –
-155,041
Closed -$369K
TRV icon
9948
Travelers Companies
TRV
$82.1B
– –
-5,351
Closed -$944K
TRVI icon
9949
Trevi Therapeutics
TRVI
$2.46B
– –
-10
Closed –
TRVG
9950
trivago
TRVG
$380M
$0 ﹤0.01%
10
-6,434
-100% -$41.2K
396 397
398
399 400

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Simplex Trading's Q2 2023 Portfolio in Review

As of Q2 2023, Simplex Trading held 10,535 positions worth $122B, up 6.9% from $114B the previous quarter. Its ten largest holdings account for 43% of the portfolio.

Simplex Trading's Q2 2023 filing shows 1,474 new, 3,350 increased, 3,913 reduced and 1,517 closed positions. Its largest new stake was Microsoft: 171,935 shares worth $58.5M. The largest sale was Apple, an estimated $51.4M.

By sector, the portfolio is most concentrated in Technology at 0.41% of assets, down from 0.42% a quarter earlier, followed by Healthcare and Consumer Discretionary.

  • Simplex Trading's largest Q2 2023 buy was Microsoft: 171,935 shares worth $58.5M.
  • Simplex Trading added most to iShares 20+ Year Treasury Bond ETF in Q2 2023, an estimated $52.9M increase.
  • Simplex Trading's biggest Q2 2023 reduction was Adobe, cutting an estimated $33.5M.
  • Simplex Trading fully exited Apple in Q2 2023, selling an estimated $51.4M.
  • Simplex Trading's ten largest holdings make up 43% of its $122B portfolio in Q2 2023.
  • Simplex Trading opened 1,474 new positions and closed 1,517 in Q2 2023.
  • Simplex Trading's portfolio value rose 6.9% quarter-over-quarter to $122B.

Based on Simplex Trading's 13F filing for Q2 2023, filed 4 Aug 2023.