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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
RLI icon
9626
CALL
RLI Corp
RLI
$5.61B
– –
-8,400
Closed -$573K
RLI icon
9627
RLI Corp
RLI
$5.61B
– –
-3,084
Closed -$208K
RLJ icon
9628
CALL
RLJ Lodging Trust
RLJ
$1.83B
– –
-117,700
Closed -$1.21M
RLJ icon
9629
PUT
RLJ Lodging Trust
RLJ
$1.83B
– –
-700
Closed -$7K
RMAX icon
9630
RE/MAX Holdings
RMAX
$204M
– –
-122
Closed -$2.12K
RDNW
9631
RideNow Group
RDNW
$246M
– –
-9,189
Closed -$74.1K
RMD icon
9632
ResMed
RMD
$27.7B
– –
-4,572
Closed -$827K
RMNI icon
9633
Rimini Street
RMNI
$402M
– –
-12,362
Closed -$37.5K
RMR icon
9634
The RMR Group
RMR
$337M
– –
-67
Closed -$1.61K
RNAM
9635
DELISTED
Avidity Biosciences
RNAM
– –
-11,972
Closed -$103K
RNAC icon
9636
Cartesian Therapeutics
RNAC
$228M
$0 ﹤0.01%
7
-36
-84% -$1.2K
RNG icon
9637
RingCentral
RNG
$3.16B
– –
-29,222
Closed -$971K
ROBT icon
9638
First Trust Nasdaq Artificial Intelligence and Robotics ETF
ROBT
$693M
– –
-2,002
Closed -$91K
ROK icon
9639
Rockwell Automation
ROK
$51.2B
– –
-2,113
Closed -$653K
ROKU icon
9640
Roku
ROKU
$21.1B
– –
-191,475
Closed -$14.8M
ROL icon
9641
Rollins
ROL
$18.9B
– –
-1,832
Closed -$74K
ROOT icon
9642
Root
ROOT
$914M
– –
-3,718
Closed -$38.5K
RPTX
9643
PUT
DELISTED
Repare Therapeutics
RPTX
– –
-9,200
Closed -$97K
RSPD icon
9644
Invesco S&P 500 Equal Weight Consumer Discretionary ETF
RSPD
$294M
– –
-300
Closed -$13K
RSPG icon
9645
Invesco S&P 500 Equal Weight Energy ETF
RSPG
$574M
– –
-100
Closed -$6K
RSPU icon
9646
Invesco S&P 500 Equal Weight Utilities ETF
RSPU
$555M
– –
-228
Closed -$12K
RUM icon
9647
RUM Group Inc
RUM
$1.67B
– –
-1
Closed -$7
RVMD icon
9648
Revolution Medicines
RVMD
$40.2B
– –
-328
Closed -$9.73K
RVSB icon
9649
Riverview Bancorp
RVSB
$107M
– –
-14
Closed –
RTB
9650
CALL
RTB Digital
RTB
$209M
– –
-14
Closed -$3K
384 385
386
387 388

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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.