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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
ILF icon
9151
iShares Latin America 40 ETF
ILF
$3.77B
– –
-292
Closed -$7K
ILMN icon
9152
Illumina
ILMN
$29.4B
– –
-10
Closed -$1.64K
IMCR icon
9153
PUT
Immunocore
IMCR
$1.78B
– –
-2,400
Closed -$143K
IMKTA icon
9154
Ingles Markets
IMKTA
$1.63B
– –
-57
Closed -$4.59K
IMKTA icon
9155
PUT
Ingles Markets
IMKTA
$1.63B
– –
-300
Closed -$24K
IMMP
9156
Immutep
IMMP
$56.7M
– –
-506
Closed -$1.03K
IMOS
9157
CALL
ChipMOS TECHNOLOGIES
IMOS
$1.92B
– –
-400
Closed -$9K
IMUX icon
9158
Immunic
IMUX
$182M
– –
-4,273
Closed -$82.1K
INDA icon
9159
iShares MSCI India ETF
INDA
$6.71B
– –
-19,048
Closed -$832K
INDL icon
9160
Direxion Daily MSCI India Bull 2X ETF
INDL
$55.2M
– –
-16
Closed –
INDS icon
9161
Pacer Industrial Real Estate ETF
INDS
$118M
– –
-87
Closed -$3K
INFA
9162
DELISTED
Informatica
INFA
– –
-2,730
Closed -$54.4K
INGR icon
9163
Ingredion
INGR
$6.38B
– –
-1,601
Closed -$166K
INN
9164
CALL
Summit Hotel Properties
INN
$761M
– –
-5,300
Closed -$34K
INMD icon
9165
InMode
INMD
$872M
– –
-18,296
Closed -$718K
INOD icon
9166
Innodata
INOD
$1.83B
– –
-44,693
Closed -$501K
INSE icon
9167
CALL
Inspired Entertainment
INSE
$177M
– –
-300
Closed -$4K
INSM icon
9168
Insmed
INSM
$23.2B
– –
-24,304
Closed -$556K
INSW icon
9169
International Seaways
INSW
$4.57B
– –
-3,893
Closed -$163K
INTA icon
9170
Intapp
INTA
$2.12B
– –
-500
Closed -$18.3K
INTU icon
9171
Intuit
INTU
$81.1B
– –
-6,396
Closed -$3.24M
INTT icon
9172
inTEST
INTT
$173M
$0 ﹤0.01%
+11
New +$203
HYFT
9173
CALL
MindWalk Holdings
HYFT
$63.5M
– –
-500
Closed -$1K
HYFT
9174
PUT
MindWalk Holdings
HYFT
$63.5M
– –
-6,300
Closed -$18K
IPAR icon
9175
PUT
Interparfums
IPAR
$3.92B
– –
-1,500
Closed -$202K
365 366
367
368 369

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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.