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 | |
|---|---|---|---|---|---|---|
3251
CALL
Vanguard Total Bond Market
BND
$158B
| $572K | ﹤0.01% |
8,000
-800
| -9% | -$57.1K |
|
3252
CALL
AbCellera Biologics
ABCL
$1.6B
| $571K | ﹤0.01% |
124,200
+38,400
| +45% | +$234K |
|
3253
PUT
Viper Energy
VNOM
$8.4B
| $571K | ﹤0.01% |
20,500
+12,100
| +144% | +$333K |
|
|
RCM
3254
CALL
DELISTED
R1 RCM Inc. Common Stock
RCM
| $571K | ﹤0.01% |
37,900
-42,700
| -53% | -$718K |
|
3255
CALL
NextDecade
NEXT
$1.7B
| $570K | ﹤0.01% |
111,500
+78,100
| +234% | +$475K |
|
3256
CALL
Pliant Therapeutics
PLRX
$66.9M
| $570K | ﹤0.01% |
32,900
-26,900
| -45% | -$466K |
|
|
TUP
3257
PUT
DELISTED
Tupperware Brands Corporation
TUP
| $570K | ﹤0.01% |
407,500
+385,700
| +1,769% | +$866K |
|
3258
PUT
Dycom Industries
DY
$12.7B
| $569K | ﹤0.01% |
6,400
+700
| +12% | +$69.8K |
|
3259
CALL
GeneDx Holdings
WGS
$1.8B
| $569K | ﹤0.01% |
156,400
| – | – |
|
3260
PUT
Immatics
IMTX
$1.18B
| $568K | ﹤0.01% |
49,100
+48,900
| +24,450% | +$584K |
|
3261
PUT
IPG Photonics
IPGP
$3.81B
| $568K | ﹤0.01% |
5,600
+5,200
| +1,300% | +$587K |
|
|
LKFT
3262
PUT
Lakefront Biotherapeutics American Depositary Shares
LKFT
$1.84B
| $566K | ﹤0.01% |
16,400
-37,400
| -70% | -$1.46M |
|
3263
CALL
Parsons
PSN
$6.36B
| $565K | ﹤0.01% |
10,400
+7,900
| +316% | +$418K |
|
3264
RenaissanceRe
RNR
$13.7B
| $565K | ﹤0.01% |
2,855
+1,969
| +222% | +$379K |
|
3265
-1x Short VIX Futures ETF
SVIX
$168M
| $565K | ﹤0.01% |
20,270
+17,052
| +530% | +$493K |
|
3266
CALL
Walker & Dunlop
WD
$1.69B
| $564K | ﹤0.01% |
7,600
+7,500
| +7,500% | +$634K |
|
3267
CALL
Pinnacle Financial Partners Inc
PNFP
$15.6B
| $563K | ﹤0.01% |
8,400
-5,900
| -41% | -$398K |
|
|
PPL
3268
PUT
PPL Corp
PPL
$27.1B
| $563K | ﹤0.01% |
23,900
+16,900
| +241% | +$437K |
|
3269
CALL
Cactus
WHD
$3.74B
| $562K | ﹤0.01% |
11,200
+1,100
| +11% | +$55.3K |
|
|
AMED
3270
PUT
DELISTED
Amedisys
AMED
| $560K | ﹤0.01% |
6,000
+1,600
| +36% | +$148K |
|
3271
CALL
Brookfield Renewable
BEPC
$5.95B
| $560K | ﹤0.01% |
23,400
+7,100
| +44% | +$206K |
|
3272
Veeco
VECO
$2.96B
| $559K | ﹤0.01% |
19,920
-2,209
| -10% | -$60.9K |
|
3273
CALL
First Financial Bancorp
FFBC
$3.52B
| $558K | ﹤0.01% |
28,500
+12,000
| +73% | +$257K |
|
|
HUT
3274
PUT
Hut 8
HUT
$11.8B
| $558K | ﹤0.01% |
57,280
+6,900
| +14% | +$98K |
|
|
SNBR
3275
PUT
DELISTED
Sleep Number
SNBR
| $558K | ﹤0.01% |
22,700
+13,000
| +134% | +$364K |
|
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.