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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
OKTA icon
9476
Okta
OKTA
$23.7B
– –
-5,217
Closed -$396K
OLED icon
9477
Universal Display
OLED
$3.71B
– –
-7,716
Closed -$1.17M
OLMA icon
9478
Olema Pharmaceuticals
OLMA
$1.03B
– –
-1,134
Closed -$11.6K
OLPX
9479
CALL
DELISTED
Olaplex Holdings
OLPX
– –
-11,000
Closed -$40K
OLPX
9480
PUT
DELISTED
Olaplex Holdings
OLPX
– –
-5,600
Closed -$20K
OM icon
9481
Outset Medical
OM
$78.4M
– –
-15
Closed -$3.54K
OM icon
9482
PUT
Outset Medical
OM
$78.4M
– –
-47
Closed -$15K
ONB icon
9483
Old National Bancorp
ONB
$9.99B
– –
-32,112
Closed -$497K
ONL
9484
Orion Office REIT
ONL
$147M
$0 ﹤0.01%
81
-120
-60% -$728
ONTO icon
9485
Onto Innovation
ONTO
$14.5B
– –
-238
Closed -$28.3K
OOTO
9486
DELISTED
Direxion Daily Travel & Vacation Bull 2X Shares
OOTO
$0 ﹤0.01%
59
-15
-20% -$203
OPCH icon
9487
Option Care Health
OPCH
$3.31B
– –
-125,364
Closed -$4.23M
OPI
9488
DELISTED
Office Properties Income Trust
OPI
– –
-31,223
Closed -$217K
OPRT icon
9489
Oportun Financial
OPRT
$244M
– –
-3,091
Closed -$20.4K
ORIC icon
9490
Oric Pharmaceuticals
ORIC
$1.13B
– –
-29,017
Closed -$238K
ORIC icon
9491
PUT
Oric Pharmaceuticals
ORIC
$1.13B
– –
-11,800
Closed -$91K
OSBC icon
9492
CALL
Old Second Bancorp
OSBC
$1.21B
– –
-100
Closed -$1K
OSBC icon
9493
PUT
Old Second Bancorp
OSBC
$1.21B
– –
-100
Closed -$1K
OSPN icon
9494
OneSpan
OSPN
$547M
– –
-24,782
Closed -$309K
OSPN icon
9495
PUT
OneSpan
OSPN
$547M
– –
-57,400
Closed -$851K
OSS icon
9496
One Stop Systems
OSS
$330M
$0 ﹤0.01%
5
-9,462
-100% -$22K
OSW icon
9497
CALL
OneSpaWorld
OSW
$2.62B
– –
-6,900
Closed -$83K
OSW icon
9498
OneSpaWorld
OSW
$2.62B
$0 ﹤0.01%
+10
New +$117
OTRK
9499
CALL
DELISTED
Ontrak
OTRK
– –
-91
Closed -$3K
OTRK
9500
DELISTED
Ontrak
OTRK
– –
-212
Closed -$8K
378 379
380
381 382

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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.