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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
-4.08%
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
$127B
AUM Growth
+$5.5B
Cap. Flow
+$11.9B
Cap. Flow %
9.37%
Top 10 Hldgs %
44.01%
Holding
10,417
New
1,399
Increased
3,690
Reduced
3,364
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 Technology 0.44%
2 Consumer Discretionary 0.32%
3 Healthcare 0.22%
4 Financials 0.17%
5 Communication Services 0.15%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
CBIO
9051
Crescent Biopharma
CBIO
$602M
– –
-183
Closed -$28.9K
GMAB icon
9052
Genmab
GMAB
$17.7B
– –
-121
Closed -$4.61K
GME icon
9053
GameStop
GME
$9.5B
– –
-163,394
Closed -$3.25M
GMED icon
9054
Globus Medical
GMED
$10.4B
– –
-509
Closed -$28.5K
GNE icon
9055
PUT
Genie Energy
GNE
$378M
– –
-100
Closed -$1K
GNRC icon
9056
Generac Holdings
GNRC
$11.9B
– –
-9,280
Closed -$1.15M
GNS icon
9057
CALL
Genius Group
GNS
$32.1M
– –
-3,900
Closed -$27K
GNS icon
9058
PUT
Genius Group
GNS
$32.1M
– –
-440
Closed -$3K
GNSS icon
9059
Genasys
GNSS
$75.6M
$0 ﹤0.01%
+311
New +$926
GOEX icon
9060
Global X Gold Explorers ETF NEW
GOEX
$106M
– –
-100
Closed -$2K
GOLF icon
9061
PUT
Acushnet Holdings
GOLF
$6.13B
– –
-700
Closed -$38K
GORV
9062
DELISTED
Lazydays
GORV
– –
-191
Closed -$66K
GORV
9063
PUT
DELISTED
Lazydays
GORV
– –
-330
Closed -$114K
GP
9064
PUT
GreenPower Motor Co
GP
$10.5M
– –
-100
Closed -$2K
GPMT
9065
Granite Point Mortgage Trust
GPMT
$63.7M
– –
-6,495
Closed -$34.9K
GPOR icon
9066
Gulfport Energy Corp
GPOR
$2.83B
– –
-260
Closed -$28.8K
GPRE icon
9067
Green Plains
GPRE
$1.19B
– –
-29,815
Closed -$976K
GREK
9068
Global X MSCI Greece ETF
GREK
$288M
– –
-2,438
Closed -$90K
GRID
9069
CALL
First Trust NASDAQ Clean Edge Smart Grid Infrastructure Index Fund
GRID
$11.4B
– –
-100
Closed -$10K
GROW icon
9070
PUT
US Global Investors
GROW
$36.3M
– –
-400
Closed -$1K
GRPN icon
9071
Groupon
GRPN
$980M
– –
-64,335
Closed -$627K
GTBP icon
9072
GT Biopharma
GTBP
$11.7M
$0 ﹤0.01%
15
+2
+15% +$17
GTIM icon
9073
CALL
Good Times Restaurants
GTIM
$14.7M
– –
-1,300
Closed -$4K
GTN icon
9074
CALL
Gray Television
GTN
$407M
– –
-16,000
Closed -$126K
GTY
9075
Getty Realty Corp
GTY
$2.1B
$0 ﹤0.01%
17
-155
-90% -$4.82K
361 362
363
364 365

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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 deployed $11.9B of net new capital in Q3 2023, opening 1,399 new positions and adding to 3,690 existing holdings. Its largest new stake was Amazon: 841,102 shares worth $107M.

By sector, the portfolio is most concentrated in Technology at 0.44% of assets, up from 0.41% a quarter earlier, followed by Consumer Discretionary and Healthcare.

On the sell side, the largest reduction was Netflix, an estimated $27.1M trimmed.

  • 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 1,399 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.