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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
TNK icon
9826
Teekay Tankers
TNK
$2.59B
– –
-880
Closed -$35.9K
TOUR
9827
PUT
Tuniu
TOUR
$57.6M
– –
-90
Closed -$1K
TOWN icon
9828
Towne Bank
TOWN
$3.29B
$0 ﹤0.01%
16
-235
-94% -$5.66K
TOWN icon
9829
PUT
Towne Bank
TOWN
$3.29B
– –
-300
Closed -$6K
TPB icon
9830
Turning Point Brands
TPB
$1.52B
– –
-671
Closed -$16.4K
TPB icon
9831
PUT
Turning Point Brands
TPB
$1.52B
– –
-400
Closed -$9K
TPIC
9832
CALL
DELISTED
TPI Composites
TPIC
– –
-7,500
Closed -$77K
TPIC
9833
PUT
DELISTED
TPI Composites
TPIC
– –
-22,600
Closed -$234K
TR icon
9834
Tootsie Roll Industries
TR
$2.96B
– –
-83
Closed -$2.48K
TR icon
9835
PUT
Tootsie Roll Industries
TR
$2.96B
– –
-219
Closed -$7K
TRIN icon
9836
Trinity Capital
TRIN
$1.58B
– –
-2,703
Closed -$39.2K
TRIP icon
9837
TripAdvisor
TRIP
$1.61B
– –
-111,956
Closed -$1.83M
TRN icon
9838
Trinity Industries
TRN
$2.87B
– –
-791
Closed -$20K
TRN icon
9839
PUT
Trinity Industries
TRN
$2.87B
– –
-1,900
Closed -$48K
TRVG
9840
CALL
trivago
TRVG
$380M
– –
-180
Closed -$1K
TRVG
9841
trivago
TRVG
$380M
$0 ﹤0.01%
40
+30
+300% +$181
TSAT icon
9842
Telesat
TSAT
$601M
– –
-288
Closed -$3.91K
TSLS icon
9843
Direxion Daily TSLA Bear 1X ETF
TSLS
$74.3M
– –
-127
Closed -$24K
TSM icon
9844
TSMC
TSM
$2.18T
– –
-55
Closed -$5.2K
TSVT
9845
DELISTED
2seventy bio
TSVT
$0 ﹤0.01%
182
-609
-77% -$3.99K
TTEK icon
9846
Tetra Tech
TTEK
$8.04B
– –
-5,470
Closed -$178K
TTGT icon
9847
TechTarget
TTGT
$260M
– –
-91
Closed -$2K
TTI icon
9848
TETRA Technologies
TTI
$1.34B
– –
-16,712
Closed -$86K
TTI icon
9849
PUT
TETRA Technologies
TTI
$1.34B
– –
-23,800
Closed -$80K
TTMI icon
9850
PUT
TTM Technologies
TTMI
$15B
– –
-100
Closed -$1K
392 393
394
395 396

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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.