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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
SDGR icon
9676
Schrodinger
SDGR
$1.13B
– –
-9,899
Closed -$399K
SDS icon
9677
ProShares UltraShort S&P500
SDS
$408M
– –
-38
Closed -$6K
SEA icon
9678
US Global Sea to Sky Cargo ETF
SEA
$15.4M
– –
-249
Closed -$3K
SEAT icon
9679
Vivid Seats
SEAT
$71.1M
– –
-41
Closed -$6.04K
SEER icon
9680
Seer Inc
SEER
$111M
– –
-63
Closed -$218
SEIC icon
9681
CALL
SEI Investments
SEIC
$11.7B
– –
-67,700
Closed -$4.04M
SEIC icon
9682
SEI Investments
SEIC
$11.7B
$0 ﹤0.01%
+1
New +$61
SELF
9683
Global Self Storage
SELF
$57.9M
– –
-1,111
Closed -$5.58K
SELF
9684
PUT
Global Self Storage
SELF
$57.9M
– –
-300
Closed -$1K
SFNC icon
9685
PUT
Simmons First National
SFNC
$3.29B
– –
-1,100
Closed -$18K
OLOX
9686
CALL
Olenox Industries
OLOX
$7.7M
– –
-1
Closed -$8K
OLOX
9687
Olenox Industries
OLOX
$7.7M
– –
-4
Closed -$29.9K
OLOX
9688
PUT
Olenox Industries
OLOX
$7.7M
– –
-5
Closed -$28K
SGC icon
9689
CALL
Superior Group of Companies
SGC
$199M
– –
-300
Closed -$2K
SGLY icon
9690
Singularity Future Technology
SGLY
$3.22M
$0 ﹤0.01%
76
-796
-91% -$4.02K
SGLY icon
9691
PUT
Singularity Future Technology
SGLY
$3.22M
– –
-560
Closed -$2K
SGMO
9692
PUT
DELISTED
SANGAMO THERAPEUTICS INC
SGMO
– –
-45,200
Closed -$58K
SGU icon
9693
CALL
Star Group
SGU
$424M
– –
-2,000
Closed -$27K
SHEN icon
9694
Shenandoah Telecom
SHEN
$645M
– –
-98
Closed -$1K
SHEN icon
9695
PUT
Shenandoah Telecom
SHEN
$645M
– –
-100
Closed -$1K
SHO icon
9696
Sunstone Hotel Investors
SHO
$2.17B
– –
-738
Closed -$6.97K
SHO icon
9697
PUT
Sunstone Hotel Investors
SHO
$2.17B
– –
-17,200
Closed -$174K
SHY icon
9698
iShares 1-3 Year Treasury Bond ETF
SHY
$25.3B
– –
-18,140
Closed -$1.47M
SHYF
9699
CALL
DELISTED
The Shyft Group
SHYF
– –
-800
Closed -$17K
SIEB icon
9700
Siebert Financial
SIEB
$67.6M
– –
-331
Closed -$737
386 387
388
389 390

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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.