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 | |
|---|---|---|---|---|---|---|
5751
PUT
Malibu Boats
MBUU
$541M
| $53K | ﹤0.01% |
1,100
+200
| +22% | +$10.7K |
|
5752
Ingevity
NGVT
$2.51B
| $53K | ﹤0.01% |
1,128
-1,269
| -53% | -$69.3K |
|
5753
Pilgrim's Pride
PPC
$6.51B
| $53K | ﹤0.01% |
2,335
-3,151
| -57% | -$76.7K |
|
|
HTT
5754
CALL
High Templar Tech Ltd
HTT
$379M
| $53K | ﹤0.01% |
25,000
-9,400
| -27% | -$20.7K |
|
5755
PUT
Regency Centers
REG
$14.7B
| $53K | ﹤0.01% |
900
-1,000
| -53% | -$63.1K |
|
5756
CALL
Smart Sand
SND
$185M
| $53K | ﹤0.01% |
22,900
-20,500
| -47% | -$40.5K |
|
5757
Interface
TILE
$1.99B
| $53K | ﹤0.01% |
5,480
-2,192
| -29% | -$21.3K |
|
|
UROY
5758
PUT
Uranium Royalty Corp
UROY
$1.3B
| $53K | ﹤0.01% |
18,500
-6,800
| -27% | -$16K |
|
|
VLRS
5759
Controladora Vuela Compania de Aviacion
VLRS
$900M
| $53K | ﹤0.01% |
7,838
-61,841
| -89% | -$668K |
|
5760
PUT
GeneDx Holdings
WGS
$1.93B
| $53K | ﹤0.01% |
14,800
+200
| +1% | +$1.1K |
|
|
WPRT
5761
PUT
Westport Fuel Systems
WPRT
$33.4M
| $53K | ﹤0.01% |
8,900
-6,000
| -40% | -$49K |
|
|
ESSA
5762
CALL
DELISTED
ESSA Bancorp
ESSA
| $52K | ﹤0.01% |
+3,500
| New | +$55.7K |
|
5763
PUT
Harmony Gold Mining
HMY
$9.84B
| $52K | ﹤0.01% |
14,000
| – | – |
|
5764
iShares US Oil Equipment & Services ETF
IEZ
$361M
| $52K | ﹤0.01% |
2,172
+1,648
| +315% | +$38.9K |
|
5765
Immersion
IMMR
$251M
| $52K | ﹤0.01% |
7,918
-52,166
| -87% | -$364K |
|
5766
PUT
OR Royalties Inc
OR
$5.58B
| $52K | ﹤0.01% |
4,500
-3,100
| -41% | -$42.3K |
|
5767
PUT
Tronox
TROX
$932M
| $52K | ﹤0.01% |
3,900
-200
| -5% | -$2.67K |
|
5768
WisdomTree Artificial Intelligence and Innovation Fund
WTAI
$587M
| $52K | ﹤0.01% |
3,014
-6,939
| -70% | -$129K |
|
|
INFN
5769
PUT
DELISTED
Infinera Corporation Common Stock
INFN
| $52K | ﹤0.01% |
12,500
+3,400
| +37% | +$14.7K |
|
|
SMAR
5770
DELISTED
Smartsheet Inc.
SMAR
| $52K | ﹤0.01% |
1,288
-9,266
| -88% | -$380K |
|
|
FREE
5771
DELISTED
Whole Earth Brands, Inc. Class A Common Stock
FREE
| $52K | ﹤0.01% |
14,499
+943
| +7% | +$3.6K |
|
5772
Arbutus Biopharma
ABUS
$857M
| $51K | ﹤0.01% |
25,391
-3,502
| -12% | -$7.34K |
|
5773
PUT
AirSculpt Technologies
AIRS
$339M
| $51K | ﹤0.01% |
7,600
+6,800
| +850% | +$54.5K |
|
5774
Atlas Lithium Corp
ATLX
$80.8M
| $51K | ﹤0.01% |
+1,678
| New | +$40.9K |
|
5775
BGC Group
BGC
$5.45B
| $51K | ﹤0.01% |
9,732
+4,801
| +97% | +$23.9K |
|
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.