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 | |
|---|---|---|---|---|---|---|
4226
PUT
uniQure
QURE
$2.75B
| $222K | ﹤0.01% |
33,200
-79,700
| -71% | -$718K |
|
4227
Sysco
SYY
$40.8B
| $222K | ﹤0.01% |
3,371
-11,545
| -77% | -$830K |
|
|
THS
4228
PUT
DELISTED
Treehouse Foods
THS
| $222K | ﹤0.01% |
5,100
+3,200
| +168% | +$153K |
|
|
ITI
4229
CALL
DELISTED
Iteris, Inc.
ITI
| $222K | ﹤0.01% |
53,800
+35,100
| +188% | +$150K |
|
4230
CALL
Addus HomeCare
ADUS
$2.22B
| $221K | ﹤0.01% |
+2,600
| New | +$232K |
|
4231
CALL
Cipher Digital
CIFR
$7.24B
| $221K | ﹤0.01% |
95,200
-6,500
| -6% | -$21.9K |
|
4232
Bio-Techne
TECH
$11.2B
| $221K | ﹤0.01% |
3,258
+3,248
| +32,480% | +$257K |
|
4233
Transmedics
TMDX
$2.7B
| $221K | ﹤0.01% |
+4,052
| New | +$292K |
|
4234
CALL
Mitek Systems
MITK
$756M
| $220K | ﹤0.01% |
20,600
+4,600
| +29% | +$51.5K |
|
4235
Mine Safety
MSA
$6.79B
| $220K | ﹤0.01% |
1,398
+1,388
| +13,880% | +$238K |
|
4236
PUT
Flowers Foods
FLO
$1.58B
| $219K | ﹤0.01% |
9,900
+4,600
| +87% | +$110K |
|
4237
Broadridge
BR
$18.4B
| $218K | ﹤0.01% |
+1,219
| New | +$216K |
|
|
4238
Mitek Systems
MITK
$756M
| $218K | ﹤0.01% |
20,378
-14,198
| -41% | -$159K |
|
4239
NGL Energy Partners
NGL
$1.94B
| $218K | ﹤0.01% |
56,404
+34,724
| +160% | +$136K |
|
|
PPSI
4240
Pioneer Power Solutions
PPSI
$30.8M
| $218K | ﹤0.01% |
34,869
+31,064
| +816% | +$218K |
|
4241
PUT
Tandem Diabetes Care
TNDM
$1.27B
| $218K | ﹤0.01% |
10,500
+6,500
| +163% | +$179K |
|
4242
Vanguard Mortgage-Backed Securities ETF
VMBS
$15.4B
| $218K | ﹤0.01% |
+4,994
| New | +$225K |
|
|
YALA
4243
PUT
Yalla Group
YALA
$814M
| $218K | ﹤0.01% |
41,700
+9,100
| +28% | +$46.3K |
|
|
HIBB
4244
PUT
DELISTED
Hibbett, Inc. Common Stock
HIBB
| $218K | ﹤0.01% |
4,600
-23,600
| -84% | -$1.01M |
|
4245
PUT
Alto Ingredients
ALTO
$338M
| $217K | ﹤0.01% |
49,300
+9,900
| +25% | +$38.3K |
|
|
APLT
4246
CALL
DELISTED
Applied Therapeutics
APLT
| $217K | ﹤0.01% |
87,400
+57,500
| +192% | +$94.8K |
|
4247
CALL
BWX Technologies
BWXT
$14.4B
| $217K | ﹤0.01% |
2,900
-2,400
| -45% | -$173K |
|
|
DHC
4248
Diversified Healthcare Trust
DHC
$2.15B
| $217K | ﹤0.01% |
111,951
+51,243
| +84% | +$130K |
|
|
HITI
4249
CALL
High Tide
HITI
$180M
| $217K | ﹤0.01% |
+117,400
| New | +$168K |
|
4250
PUT
Mueller Industries
MLI
$14.5B
| $217K | ﹤0.01% |
11,600
-7,600
| -40% | -$150K |
|
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.