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 | |
|---|---|---|---|---|---|---|
3326
CALL
Oshkosh
OSK
$9.66B
| $534K | ﹤0.01% |
5,600
+3,100
| +124% | +$301K |
|
3327
PUT
Robert Half
RHI
$4.07B
| $534K | ﹤0.01% |
7,300
+5,200
| +248% | +$395K |
|
3328
CALL
Colliers International
CIGI
$5.21B
| $533K | ﹤0.01% |
+5,600
| New | +$601K |
|
3329
Edison International
EIX
$30.3B
| $533K | ﹤0.01% |
8,422
-3,704
| -31% | -$258K |
|
3330
CALL
Amplify Energy
AMPY
$155M
| $532K | ﹤0.01% |
72,500
-25,800
| -26% | -$178K |
|
|
JMIA
3331
Jumia Technologies
JMIA
$752M
| $532K | ﹤0.01% |
201,619
-48,445
| -19% | -$168K |
|
3332
CALL
Atossa Therapeutics
ATOS
$23.5M
| $531K | ﹤0.01% |
48,093
+2,873
| +6% | +$41.7K |
|
3333
CALL
Invesco
IVZ
$13.3B
| $531K | ﹤0.01% |
36,600
-69,300
| -65% | -$1.12M |
|
3334
PUT
LegalZoom.com
LZ
$1.3B
| $531K | ﹤0.01% |
48,600
+10,000
| +26% | +$123K |
|
3335
CALL
AvePoint
AVPT
$2.72B
| $530K | ﹤0.01% |
78,900
+32,300
| +69% | +$204K |
|
3336
PUT
Travere Therapeutics
TVTX
$5.27B
| $530K | ﹤0.01% |
59,300
+58,200
| +5,291% | +$821K |
|
3337
CALL
Digimarc Corp
DMRC
$137M
| $529K | ﹤0.01% |
16,300
+7,000
| +75% | +$224K |
|
3338
CALL
Ardmore Shipping
ASC
$669M
| $528K | ﹤0.01% |
40,600
-17,800
| -30% | -$229K |
|
3339
CALL
The Greenbrier Companies
GBX
$1.56B
| $528K | ﹤0.01% |
13,200
+8,900
| +207% | +$382K |
|
3340
MarketAxess Holdings
MKTX
$4.19B
| $528K | ﹤0.01% |
+2,472
| New | +$599K |
|
3341
CALL
Intellia Therapeutics
NTLA
$1.49B
| $528K | ﹤0.01% |
16,700
-4,100
| -20% | -$159K |
|
|
ARVL
3342
CALL
DELISTED
Arrival Ordinary Shares
ARVL
| $528K | ﹤0.01% |
444,100
| – | – |
|
3343
Axsome Therapeutics
AXSM
$12.3B
| $527K | ﹤0.01% |
7,546
-6,795
| -47% | -$508K |
|
3344
Frontdoor
FTDR
$5.1B
| $527K | ﹤0.01% |
17,245
+13,897
| +415% | +$460K |
|
3345
CALL
Bausch + Lomb
BLCO
$5.8B
| $525K | ﹤0.01% |
31,000
-5,100
| -14% | -$95.4K |
|
3346
CALL
Fox Factory Holding Corp
FOXF
$779M
| $525K | ﹤0.01% |
5,300
+5,200
| +5,200% | +$556K |
|
3347
Freshworks
FRSH
$2.99B
| $525K | ﹤0.01% |
+26,396
| New | +$525K |
|
3348
PUT
OneWater Marine
ONEW
$218M
| $525K | ﹤0.01% |
20,500
-2,000
| -9% | -$59.7K |
|
3349
10x Genomics
TXG
$5.83B
| $525K | ﹤0.01% |
12,732
+7,637
| +150% | +$397K |
|
3350
CALL
Privia Health
PRVA
$3.11B
| $524K | ﹤0.01% |
22,800
| – | – |
|
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.