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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
SPYV icon
9751
State Street SPDR Portfolio S&P 500 Value ETF
SPYV
$35.8B
– –
-3,225
Closed -$139K
SQM icon
9752
Sociedad Química y Minera de Chile
SQM
$19.9B
– –
-2,234
Closed -$151K
SQQQ icon
9753
ProShares UltraPro Short QQQ
SQQQ
$2.16B
– –
-15,010
Closed -$7.1M
SRL icon
9754
Scully Royalty
SRL
$78.3M
– –
-183
Closed -$1.18K
SRRK icon
9755
Scholar Rock
SRRK
$5.82B
– –
-1,751
Closed -$11.8K
SRTS icon
9756
CALL
Sensus Healthcare
SRTS
$48.9M
– –
-1,200
Closed -$3K
SSB icon
9757
PUT
SouthState Bank Corp
SSB
$9.81B
– –
-13,800
Closed -$908K
SSTI icon
9758
CALL
SoundThinking
SSTI
$107M
– –
-200
Closed -$4K
STAA icon
9759
STAAR Surgical
STAA
$1.2B
– –
-15,003
Closed -$703K
STE icon
9760
PUT
Steris
STE
$20.7B
– –
-200
Closed -$44K
STIM icon
9761
Neuronetics
STIM
$129M
$0 ﹤0.01%
+122
New +$214
STKH
9762
Steakholder Foods
STKH
$710K
$0 ﹤0.01%
+3
New +$1.24K
STKS icon
9763
The ONE Group
STKS
$56.5M
– –
-6,166
Closed -$45K
STOK icon
9764
PUT
Stoke Therapeutics
STOK
$1.79B
– –
-100
Closed -$1K
STR
9765
DELISTED
Sitio Royalties
STR
– –
-400
Closed -$10.3K
STRO icon
9766
CALL
Sutro Biopharma
STRO
$381M
– –
-290
Closed -$13K
STTK icon
9767
Shattuck Labs
STTK
$649M
$0 ﹤0.01%
152
-133
-47% -$304
STXS icon
9768
PUT
Stereotaxis
STXS
$144M
– –
-26,100
Closed -$39K
SU icon
9769
Suncor Energy
SU
$78.7B
– –
-286,900
Closed -$9.2M
SUN icon
9770
Sunoco
SUN
$14.3B
– –
-8,277
Closed -$376K
SUP
9771
CALL
DELISTED
Superior Industries International
SUP
– –
-7,300
Closed -$26K
SWX icon
9772
PUT
Southwest Gas
SWX
$6.76B
– –
-100
Closed -$6K
SY
9773
So-Young International
SY
$193M
– –
-4,440
Closed -$8K
SYF icon
9774
Synchrony
SYF
$23.1B
– –
-34,969
Closed -$1.16M
SYRE icon
9775
Spyre Therapeutics
SYRE
$8.56B
– –
-112
Closed -$1K
389 390
391
392 393

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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.