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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
SYNA icon
9901
Synaptics
SYNA
$4.71B
– –
-1,635
Closed -$142K
SYM icon
9902
Symbotic
SYM
$5.4B
– –
-9,690
Closed -$318K
TAC icon
9903
TransAlta
TAC
$4.44B
– –
-645
Closed -$6.05K
TAC icon
9904
PUT
TransAlta
TAC
$4.44B
– –
-500
Closed -$4K
TAIL icon
9905
Cambria Tail Risk ETF
TAIL
$145M
– –
-5,534
Closed -$79.4K
TALK icon
9906
Talkspace
TALK
$873M
– –
-461
Closed -$447
TALO icon
9907
Talos Energy
TALO
$2.55B
– –
-4,160
Closed -$56K
TAP icon
9908
Molson Coors Class B
TAP
$7.7B
– –
-4,800
Closed -$297K
TARA icon
9909
CALL
Protara Therapeutics
TARA
$229M
– –
-400
Closed -$1K
TARA icon
9910
Protara Therapeutics
TARA
$229M
$0 ﹤0.01%
+195
New +$579
TDUP icon
9911
CALL
ThredUp
TDUP
$779M
– –
-2,500
Closed -$6K
TECH icon
9912
Bio-Techne
TECH
$11.2B
$0 ﹤0.01%
+10
New +$804
TEF
9913
CALL
DELISTED
Telefonica
TEF
– –
-5,300
Closed -$22K
TEL icon
9914
TE Connectivity
TEL
$58.5B
– –
-6,305
Closed -$797K
TEX icon
9915
Terex
TEX
$7.66B
– –
-6,375
Closed -$316K
TFIN icon
9916
PUT
Triumph Financial Inc
TFIN
$1.93B
– –
-1,000
Closed -$58K
TGS icon
9917
Transportadora de Gas del Sur
TGS
$4.74B
– –
-162
Closed -$1K
THC icon
9918
Tenet Healthcare
THC
$16.8B
– –
-11,176
Closed -$796K
TIGO icon
9919
Millicom
TIGO
$16.4B
– –
-49
Closed -$871
TILT icon
9920
PUT
FlexShares Morningstar US Market Factors Tilt Index Fund
TILT
$2.18B
– –
-100
Closed -$4K
TKC icon
9921
CALL
Turkcell
TKC
$5.11B
– –
-8,900
Closed -$38K
TKC icon
9922
Turkcell
TKC
$5.11B
– –
-13,333
Closed -$55.9K
TLH icon
9923
iShares 10-20 Year Treasury Bond ETF
TLH
$11B
– –
-2,346
Closed -$268K
TLRY icon
9924
Tilray
TLRY
$514M
$0 ﹤0.01%
8
-6,531
-100% -$140K
TLS icon
9925
Telos
TLS
$335M
$0 ﹤0.01%
+135
New +$320
395 396
397
398 399

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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.