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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
HYLN icon
9126
PUT
Hyliion Holdings
HYLN
$659M
– –
-22,000
Closed -$36K
HYPR icon
9127
Hyperfine
HYPR
$86.2M
$0 ﹤0.01%
+486
New +$1.12K
HZO icon
9128
MarineMax
HZO
$1.15B
– –
-6,873
Closed -$239K
PPLI
9129
People Inc
PPLI
$2.9B
– –
-1,738
Closed -$84.3K
IAI icon
9130
iShares US Broker-Dealers & Securities Exchanges ETF
IAI
$1.42B
– –
-100
Closed -$9K
IAU icon
9131
iShares Gold Trust
IAU
$65.8B
– –
-12,360
Closed -$451K
IBEX icon
9132
IBEX
IBEX
$524M
$0 ﹤0.01%
+14
New +$262
IBUY icon
9133
Amplify Online Retail ETF
IBUY
$125M
– –
-107
Closed -$5.13K
ICF icon
9134
iShares Select U.S. REIT ETF
ICF
$2.01B
– –
-43
Closed -$2K
ICFI icon
9135
ICF International
ICFI
$1.58B
$0 ﹤0.01%
+1
New +$125
ICMB icon
9136
CALL
Investcorp Credit Management BDC
ICMB
$12.8M
– –
-1,700
Closed -$6K
ICUI icon
9137
CALL
ICU Medical
ICUI
$4.19B
– –
-100
Closed -$17K
IDN icon
9138
CALL
Intellicheck
IDN
$56.5M
– –
-2,400
Closed -$5K
IDYA icon
9139
IDEAYA Biosciences
IDYA
$3.85B
– –
-1,498
Closed -$38K
IEI icon
9140
iShares 3-7 Year Treasury Bond ETF
IEI
$17.5B
– –
-34,602
Closed -$3.99M
IEP icon
9141
Icahn Enterprises
IEP
$4.85B
– –
-350
Closed -$8.84K
IEX icon
9142
PUT
IDEX
IEX
$16.5B
– –
-300
Closed -$64K
IGM icon
9143
iShares Expanded Tech Sector ETF
IGM
$10.7B
– –
-8,322
Closed -$544K
IHI icon
9144
iShares US Medical Devices ETF
IHI
$3.37B
– –
-1,669
Closed -$94K
III icon
9145
CALL
Information Services Group
III
$251M
– –
-400
Closed -$2K
IIIN icon
9146
Insteel Industries
IIIN
$605M
– –
-1
Closed -$32
IIIN icon
9147
PUT
Insteel Industries
IIIN
$605M
– –
-200
Closed -$6K
IIIV icon
9148
CALL
i3 Verticals
IIIV
$299M
– –
-300
Closed -$6K
IJH icon
9149
iShares Core S&P Mid-Cap ETF
IJH
$126B
– –
-5,665
Closed -$296K
IJS icon
9150
iShares S&P Small-Cap 600 Value ETF
IJS
$8.3B
– –
-145
Closed -$13K
364 365
366
367 368

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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.