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 | |
|---|---|---|---|---|---|---|
4601
CALL
Brink's
BCO
$5.01B
| $159K | ﹤0.01% |
2,200
+1,600
| +267% | +$115K |
|
|
BLFY
4602
CALL
DELISTED
Blue Foundry Bancorp
BLFY
| $159K | ﹤0.01% |
19,100
+3,600
| +23% | +$34.2K |
|
4603
PUT
Carlyle Group
CG
$16.1B
| $159K | ﹤0.01% |
5,300
-5,000
| -49% | -$161K |
|
4604
Microvast
MVST
$237M
| $159K | ﹤0.01% |
84,640
+38,759
| +84% | +$83K |
|
|
ORC
4605
CALL
Orchid Island Capital
ORC
$1.31B
| $159K | ﹤0.01% |
18,700
+4,900
| +36% | +$48.1K |
|
4606
Quanterix
QTRX
$159M
| $159K | ﹤0.01% |
+5,863
| New | +$145K |
|
4607
CALL
Sibanye-Stillwater
SBSW
$6.05B
| $159K | ﹤0.01% |
25,800
-28,500
| -52% | -$188K |
|
4608
PUT
Voyager Therapeutics
VYGR
$181M
| $159K | ﹤0.01% |
20,600
+11,300
| +122% | +$103K |
|
|
HIBB
4609
DELISTED
Hibbett, Inc. Common Stock
HIBB
| $159K | ﹤0.01% |
+3,353
| New | +$143K |
|
4610
PUT
Dine Brands
DIN
$462M
| $158K | ﹤0.01% |
3,200
-800
| -20% | -$44.7K |
|
4611
Forum Energy Technologies
FET
$578M
| $158K | ﹤0.01% |
6,591
+378
| +6% | +$9.43K |
|
4612
CALL
Limbach Holdings
LMB
$807M
| $158K | ﹤0.01% |
5,000
-8,300
| -62% | -$251K |
|
4613
CALL
Global X MSCI Norway ETF
NORW
$86.1M
| $158K | ﹤0.01% |
8,900
+4,700
| +112% | +$114K |
|
4614
CALL
VOC Energy
VOC
$56.4M
| $158K | ﹤0.01% |
16,100
+600
| +4% | +$5.21K |
|
4615
United Parks & Resorts
PRKS
$2.19B
| $158K | ﹤0.01% |
3,428
-29,080
| -89% | -$1.48M |
|
|
GLDD
4616
CALL
DELISTED
Great Lakes Dredge & Dock
GLDD
| $157K | ﹤0.01% |
19,800
+15,600
| +371% | +$129K |
|
4617
CALL
Newegg Commerce
NEGG
$273M
| $157K | ﹤0.01% |
9,290
+7,975
| +606% | +$185K |
|
4618
CALL
Oppenheimer Holdings
OPY
$1.18B
| $157K | ﹤0.01% |
+4,100
| New | +$160K |
|
4619
PUT
Plains GP Holdings
PAGP
$5.28B
| $157K | ﹤0.01% |
9,800
+8,000
| +444% | +$126K |
|
4620
SFL Corp
SFL
$1.61B
| $157K | ﹤0.01% |
14,145
+12,457
| +738% | +$129K |
|
4621
PUT
United Microelectronic
UMC
$42.9B
| $157K | ﹤0.01% |
22,300
-111,100
| -83% | -$805K |
|
4622
PUT
Clover Health Investments
CLOV
$2.23B
| $156K | ﹤0.01% |
144,600
+131,200
| +979% | +$156K |
|
|
DX
4623
CALL
Dynex Capital
DX
$3.18B
| $156K | ﹤0.01% |
13,100
+8,500
| +185% | +$108K |
|
4624
CALL
Nordson
NDSN
$16.4B
| $156K | ﹤0.01% |
700
+600
| +600% | +$144K |
|
4625
PUT
Banco Santander
SAN
$191B
| $156K | ﹤0.01% |
41,600
-5,800
| -12% | -$22K |
|
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.