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Simplex Trading

Simplex Trading Portfolio holdings

AUM $171B
1-Year Est. Return 85%
 

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
+85%
3 Year Est. Return
+183.25%
5 Year Est. Return
+145.21%
10 Year Est. Return
+1,056.84%
AUM
$127B
AUM Growth
+$5.5B
Cap. Flow
+$559M
Cap. Flow %
0.44%
Top 10 Hldgs %
44.01%
Holding
10,417
New
1,401
Increased
3,688
Reduced
3,363
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 Miscellaneous 98.25%
2 Technology 0.44%
3 Consumer Discretionary 0.32%
4 Healthcare 0.22%
5 Financials 0.17%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
RCAT icon
9601
Red Cat Holdings
RCAT
$1.28B
$0 ﹤0.01%
853
-7,490
-90% -$7.67K
RCEL icon
9602
Avita Medical
RCEL
$346M
– –
-13,796
Closed -$233K
RDY icon
9603
CALL
Dr. Reddy's Laboratories
RDY
$9.97B
– –
-1,000
Closed -$12K
REFI
9604
CALL
Chicago Atlantic Real Estate Finance
REFI
$281M
– –
-700
Closed -$10K
REAX icon
9605
Real REMAX Group Inc. Common Stock
REAX
$407M
– –
-3
Closed –
REFR icon
9606
Research Frontiers
REFR
$14.5M
$0 ﹤0.01%
95
-5
-5% -$8
REG icon
9607
CALL
Regency Centers
REG
$13.8B
– –
-200
Closed -$12K
REK icon
9608
ProShares Short Real Estate
REK
$12.1M
– –
-1,609
Closed -$31K
REKR icon
9609
Rekor Systems
REKR
$73.8M
– –
-66,195
Closed -$202K
RELX icon
9610
RELX
RELX
$61.8B
– –
-93
Closed -$3.07K
LNAI
9611
Lunai Bioworks
LNAI
$10.8M
$0 ﹤0.01%
+1
New +$152
RETL icon
9612
Direxion Daily Retail Bull 3X ETF
RETL
$26.6M
$0 ﹤0.01%
164
+132
+413% +$925
REW icon
9613
Proshares UltraShort Technology
REW
$3M
– –
-1
Closed -$83
REX icon
9614
REX American Resources
REX
$1.38B
– –
-200
Closed -$3.76K
REX icon
9615
PUT
REX American Resources
REX
$1.38B
– –
-1,400
Closed -$24K
REYN icon
9616
PUT
Reynolds Consumer Products
REYN
$4.61B
– –
-500
Closed -$14K
RFIL icon
9617
RF Industries
RFIL
$114M
$0 ﹤0.01%
92
-2,331
-96% -$8.52K
RFIL icon
9618
PUT
RF Industries
RFIL
$114M
– –
-2,500
Closed -$10K
RGA icon
9619
PUT
Reinsurance Group of America
RGA
$16.5B
– –
-100
Closed -$13K
RHP icon
9620
CALL
Ryman Hospitality Properties
RHP
$8.52B
– –
-1,600
Closed -$148K
RIET icon
9621
Hoya Capital High Dividend Yield ETF
RIET
$109M
– –
-156
Closed -$1K
RINF icon
9622
ProShares Inflation Expectations ETF
RINF
$18.1M
– –
-146
Closed -$4K
RJF icon
9623
Raymond James Financial
RJF
$34.3B
– –
-548
Closed -$58K
RKT icon
9624
Rocket Companies
RKT
$39.8B
– –
-4,000
Closed -$40.4K
RLGT icon
9625
CALL
Radiant Logistics
RLGT
$395M
– –
-9,400
Closed -$63K
383 384
385
386 387

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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's Q3 2023 filing shows 1,401 new, 3,688 increased, 3,363 reduced and 1,719 closed positions. Its largest new stake was Amazon: 841,102 shares worth $107M. The largest sale was Netflix, an estimated $27.1M.

By sector, the portfolio is most concentrated in Miscellaneous at 98% of assets, down from 98% a quarter earlier, followed by Technology and Consumer Discretionary.

  • 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 1,401 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.