Simplex Trading Portfolio holdings
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.
Top Buys
| Rank | Stock | Value |
|---|---|---|
| 1 |
Amazon
AMZN
|
+$113M |
| 2 |
SPDR Gold Trust
GLD
|
+$68.6M |
| 3 |
NVIDIA
NVDA
|
+$63.4M |
| 4 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$55.2M |
| 5 |
Apple
AAPL
|
+$54.9M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Netflix
NFLX
|
+$27.1M |
| 2 |
Qualcomm
QCOM
|
+$24.6M |
| 3 |
Walt Disney
DIS
|
+$21.2M |
| 4 |
Advanced Micro Devices
AMD
|
+$18.2M |
| 5 |
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 | |
|---|---|---|---|---|---|---|
|
EMBJ
2076
PUT
Embraer S.A. ADS
EMBJ
$11.6B
| $1.98M | ﹤0.01% |
144,500
+6,800
| +5% | +$101K |
|
|
ARCH
2077
PUT
DELISTED
Arch Resources, Inc.
ARCH
| $1.98M | ﹤0.01% |
11,600
+1,200
| +12% | +$161K |
|
2078
PUT
Cheesecake Factory
CAKE
$4.21B
| $1.98M | ﹤0.01% |
65,300
-14,600
| -18% | -$487K |
|
2079
PUT
Aramark
ARMK
$15B
| $1.98M | ﹤0.01% |
78,945
+42,796
| +118% | +$1.2M |
|
2080
CALL
California Resources
CRC
$4.75B
| $1.98M | ﹤0.01% |
35,300
-6,700
| -16% | -$357K |
|
2081
Cigna
CI
$76.6B
| $1.97M | ﹤0.01% |
6,896
-107
| -2% | -$30.5K |
|
2082
CALL
Replimune Group
REPL
$814M
| $1.97M | ﹤0.01% |
115,300
+115,100
| +57,550% | +$2.26M |
|
2083
CALL
Mirion Technologies
MIR
$4.05B
| $1.97M | ﹤0.01% |
263,900
+142,900
| +118% | +$1.13M |
|
2084
Trade Desk
TTD
$8.13B
| $1.97M | ﹤0.01% |
25,210
-54,594
| -68% | -$4.41M |
|
2085
C.H. Robinson
CHRW
$22B
| $1.97M | ﹤0.01% |
22,872
+22,142
| +3,033% | +$2.07M |
|
2086
CALL
AerCap
AER
$23.9B
| $1.97M | ﹤0.01% |
31,400
+17,400
| +124% | +$1.1M |
|
2087
CALL
PureCycle Technologies
PCT
$1.17B
| $1.97M | ﹤0.01% |
350,600
-128,900
| -27% | -$1.21M |
|
2088
PUT
MSC Industrial Direct
MSM
$7.02B
| $1.96M | ﹤0.01% |
20,000
+19,600
| +4,900% | +$1.93M |
|
2089
PUT
ScottsMiracle-Gro
SMG
$4.03B
| $1.96M | ﹤0.01% |
38,000
-8,000
| -17% | -$463K |
|
2090
Boston Scientific
BSX
$65.8B
| $1.96M | ﹤0.01% |
+37,160
| New | +$1.95M |
|
2091
PUT
Albertsons Companies
ACI
$5.4B
| $1.96M | ﹤0.01% |
86,200
+9,900
| +13% | +$221K |
|
|
FITB
2092
PUT
Fifth Third Bancorp
FITB
$52B
| $1.96M | ﹤0.01% |
77,400
-320,600
| -81% | -$8.65M |
|
2093
CALL
Melco Resorts & Entertainment
MLCO
$2.1B
| $1.96M | ﹤0.01% |
198,200
+23,600
| +14% | +$274K |
|
2094
CALL
Emcor
EME
$33.1B
| $1.96M | ﹤0.01% |
9,300
+8,800
| +1,760% | +$1.84M |
|
2095
PUT
Wendy's
WEN
$1.33B
| $1.96M | ﹤0.01% |
95,800
-39,600
| -29% | -$827K |
|
2096
CALL
West Pharmaceutical
WST
$23.1B
| $1.95M | ﹤0.01% |
5,200
+4,800
| +1,200% | +$1.86M |
|
2097
UBS Group
UBS
$170B
| $1.95M | ﹤0.01% |
78,949
+24,404
| +45% | +$570K |
|
|
PACW
2098
CALL
DELISTED
PacWest Bancorp
PACW
| $1.94M | ﹤0.01% |
245,400
-547,900
| -69% | -$4.57M |
|
2099
CALL
International Seaways
INSW
$4.57B
| $1.94M | ﹤0.01% |
43,100
+40,900
| +1,859% | +$1.72M |
|
2100
PUT
Madison Square Garden
MSGS
$9.54B
| $1.94M | ﹤0.01% |
11,000
+5,500
| +100% | +$1.04M |
|
Similar funds
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.