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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
IYF icon
9201
iShares US Financials ETF
IYF
$4.38B
– –
-285
Closed -$21K
IYH icon
9202
iShares US Healthcare ETF
IYH
$3.11B
– –
-90
Closed -$5K
IYW icon
9203
iShares US Technology ETF
IYW
$23.7B
– –
-1,785
Closed -$194K
IYZ icon
9204
iShares US Telecommunications ETF
IYZ
$1.19B
– –
-994
Closed -$21K
J icon
9205
Jacobs Solutions
J
$15.9B
– –
-14,085
Closed -$1.52M
JAKK icon
9206
Jakks Pacific
JAKK
$282M
– –
-1,200
Closed -$22.9K
JAMF
9207
DELISTED
Jamf
JAMF
– –
-587
Closed -$10.9K
JAZZ icon
9208
Jazz Pharmaceuticals
JAZZ
$15.9B
– –
-56
Closed -$7.46K
JBGS
9209
JBG SMITH
JBGS
$847M
– –
-160
Closed -$2.48K
JBGS
9210
PUT
JBG SMITH
JBGS
$847M
– –
-1,100
Closed -$16K
JBHT icon
9211
JB Hunt Transport Services
JBHT
$27.2B
– –
-5,500
Closed -$1.06M
JBSS icon
9212
John B. Sanfilippo & Son
JBSS
$949M
– –
-7
Closed -$736
JELD icon
9213
PUT
JELD-WEN Holding
JELD
$93M
– –
-200
Closed -$3K
JETS icon
9214
US Global Jets ETF
JETS
$800M
– –
-1,000
Closed -$21K
JKHY icon
9215
Jack Henry & Associates
JKHY
$10.7B
– –
-875
Closed -$141K
JNJ icon
9216
Johnson & Johnson
JNJ
$633B
– –
-90,729
Closed -$15M
JNPR
9217
DELISTED
Juniper Networks
JNPR
– –
-85,435
Closed -$2.46M
JNUG icon
9218
Direxion Daily Junior Gold Miners Index Bull 2X ETF
JNUG
$349M
– –
-6,041
Closed -$197K
JOBY icon
9219
Joby Aviation
JOBY
$6.92B
– –
-100
Closed -$788
JOE icon
9220
St. Joe Company
JOE
$3.57B
– –
-2,870
Closed -$166K
JSPR icon
9221
Jasper Therapeutics
JSPR
$23.1M
– –
-92
Closed -$1.12K
OPLN
9222
PUT
Openlane
OPLN
$4.16B
– –
-500
Closed -$7K
KBE icon
9223
State Street SPDR S&P Bank ETF
KBE
$1.64B
– –
-4,511
Closed -$162K
KBH icon
9224
KB Home
KBH
$3.47B
– –
-46,827
Closed -$2.38M
KBWB icon
9225
Invesco KBW Bank ETF
KBWB
$7.07B
– –
-2,504
Closed -$102K
367 368
369
370 371

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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.