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 | |
|---|---|---|---|---|---|---|
5076
Orion
OEC
$381M
| $101K | ﹤0.01% |
+4,779
| New | +$104K |
|
5077
CALL
FlexShares Morningstar US Market Factors Tilt Index Fund
TILT
$2.18B
| $101K | ﹤0.01% |
2,500
+2,100
| +525% | +$357K |
|
|
NSTG
5078
DELISTED
NanoString Technologies, Inc.
NSTG
| $101K | ﹤0.01% |
59,242
+42,150
| +247% | +$128K |
|
5079
CALL
Assurant
AIZ
$14B
| $100K | ﹤0.01% |
700
-400
| -36% | -$54.8K |
|
5080
PUT
Badger Meter
BMI
$3.78B
| $100K | ﹤0.01% |
+700
| New | +$111K |
|
5081
Church & Dwight Co
CHD
$23.1B
| $100K | ﹤0.01% |
+1,096
| New | +$105K |
|
5082
PUT
Clean Harbors
CLH
$16.8B
| $100K | ﹤0.01% |
600
-300
| -33% | -$50.6K |
|
5083
Ferguson
FERG
$43.9B
| $100K | ﹤0.01% |
+614
| New | +$97K |
|
5084
PUT
Gaotu Techedu
GOTU
$439M
| $100K | ﹤0.01% |
36,300
-14,600
| -29% | -$45.6K |
|
5085
CALL
Dorian LPG
LPG
$1.98B
| $100K | ﹤0.01% |
3,500
-1,800
| -34% | -$48.4K |
|
5086
CALL
Mercury Systems
MRCY
$5.76B
| $100K | ﹤0.01% |
2,700
+2,100
| +350% | +$77.5K |
|
5087
PUT
PAR Technology
PAR
$695M
| $100K | ﹤0.01% |
2,600
-10,400
| -80% | -$394K |
|
|
BECN
5088
CALL
DELISTED
Beacon Roofing Supply, Inc.
BECN
| $100K | ﹤0.01% |
1,300
-900
| -41% | -$72.7K |
|
|
EGIO
5089
DELISTED
Edgio, Inc. Common Stock
EGIO
| $100K | ﹤0.01% |
2,943
+995
| +51% | +$31.2K |
|
|
DSKE
5090
CALL
DELISTED
Daseke, Inc. Common Stock
DSKE
| $100K | ﹤0.01% |
19,600
-55,500
| -74% | -$335K |
|
|
BIOR
5091
PUT
DELISTED
Biora Therapeutics, Inc. Common Stock
BIOR
| $100K | ﹤0.01% |
4,630
-250
| -5% | -$8.01K |
|
5092
PUT
Dynagas LNG Partners
DLNG
$134M
| $99K | ﹤0.01% |
36,800
-5,400
| -13% | -$14.9K |
|
|
DRD
5093
PUT
DRDGold
DRD
$1.81B
| $99K | ﹤0.01% |
12,000
+10,300
| +606% | +$104K |
|
5094
PUT
Hecla Mining
HL
$10B
| $99K | ﹤0.01% |
25,400
-99,500
| -80% | -$477K |
|
5095
Natera
NTRA
$38.6B
| $99K | ﹤0.01% |
2,242
-2,718
| -55% | -$139K |
|
5096
SS&C Technologies
SSNC
$18.6B
| $99K | ﹤0.01% |
1,890
-1,812
| -49% | -$104K |
|
5097
PUT
TaskUs
TASK
$542M
| $99K | ﹤0.01% |
9,600
+1,600
| +20% | +$17.2K |
|
|
AGR
5098
PUT
DELISTED
Avangrid, Inc.
AGR
| $99K | ﹤0.01% |
+3,300
| New | +$117K |
|
|
INST
5099
PUT
DELISTED
Instructure Holdings, Inc.
INST
| $99K | ﹤0.01% |
3,900
+2,900
| +290% | +$75.1K |
|
|
CVSA
5100
PUT
Covista Inc
CVSA
$4.3B
| $98K | ﹤0.01% |
+2,300
| New | +$97.2K |
|
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.