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 | |
|---|---|---|---|---|---|---|
2926
PUT
NeoGenomics
NEO
$1.73B
| $782K | ﹤0.01% |
63,600
+60,400
| +1,888% | +$898K |
|
2927
PUT
Unum
UNM
$13.8B
| $782K | ﹤0.01% |
15,900
+7,100
| +81% | +$347K |
|
2928
ProShares Ultra Dow30
DDM
$534M
| $780K | ﹤0.01% |
24,592
+18,190
| +284% | +$621K |
|
2929
PUT
XP
XP
$8.62B
| $779K | ﹤0.01% |
33,800
-156,700
| -82% | -$3.93M |
|
2930
CALL
Ouster
OUST
$2.31B
| $778K | ﹤0.01% |
154,400
-32,600
| -17% | -$180K |
|
|
K
2931
DELISTED
Kellanova
K
| $777K | ﹤0.01% |
+13,913
| New | +$828K |
|
|
TELL
2932
CALL
DELISTED
Tellurian Inc.
TELL
| $777K | ﹤0.01% |
670,000
+44,400
| +7% | +$60.4K |
|
2933
CALL
Ericsson
ERIC
$31.6B
| $776K | ﹤0.01% |
159,700
+31,000
| +24% | +$158K |
|
2934
PUT
Uranium Energy
UEC
$4.8B
| $775K | ﹤0.01% |
150,600
+117,500
| +355% | +$479K |
|
2935
PUT
Endava
DAVA
$148M
| $774K | ﹤0.01% |
13,500
+1,500
| +13% | +$78.2K |
|
2936
CALL
Leidos
LDOS
$14.5B
| $774K | ﹤0.01% |
8,400
-22,400
| -73% | -$2.11M |
|
2937
CALL
Weibo
WB
$1.93B
| $774K | ﹤0.01% |
61,800
+15,400
| +33% | +$205K |
|
2938
ADT
ADT
$5.26B
| $773K | ﹤0.01% |
+128,940
| New | +$804K |
|
2939
PUT
CNX Resources
CNX
$4.79B
| $772K | ﹤0.01% |
34,200
+11,600
| +51% | +$240K |
|
2940
LGI Homes
LGIH
$1.39B
| $772K | ﹤0.01% |
+7,768
| New | +$964K |
|
2941
Southern Copper
SCCO
$138B
| $768K | ﹤0.01% |
+11,013
| New | +$805K |
|
2942
PUT
Getty Images
GETY
$183M
| $767K | ﹤0.01% |
118,300
-151,400
| -56% | -$763K |
|
2943
PUT
Tilray
TLRY
$495M
| $767K | ﹤0.01% |
32,110
+18,770
| +141% | +$443K |
|
2944
CALL
Brookfield Asset Management
BAM
$75.6B
| $766K | ﹤0.01% |
23,000
+15,900
| +224% | +$537K |
|
2945
PUT
Carpenter Technology
CRS
$28.5B
| $766K | ﹤0.01% |
11,400
+10,100
| +777% | +$612K |
|
2946
CALL
Pacific Biosciences
PACB
$422M
| $765K | ﹤0.01% |
91,700
-30,500
| -25% | -$349K |
|
2947
Energy Fuels
UUUU
$2.87B
| $765K | ﹤0.01% |
93,143
+58,624
| +170% | +$403K |
|
|
MORF
2948
PUT
DELISTED
Morphic Holding, Inc. Common Stock
MORF
| $765K | ﹤0.01% |
33,400
+18,900
| +130% | +$992K |
|
2949
CALL
Ardelyx
ARDX
$1.27B
| $764K | ﹤0.01% |
187,300
+12,000
| +7% | +$46.8K |
|
2950
Under Armour Class C
UA
$2.95B
| $764K | ﹤0.01% |
119,877
+42,727
| +55% | +$294K |
|
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.