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 | |
|---|---|---|---|---|---|---|
5601
PUT
Odyssey Marine Exploration
OMEX
$34.9M
| $62K | ﹤0.01% |
16,800
-15,300
| -48% | -$58K |
|
5602
PUT
Pitney Bowes
PBI
$2.4B
| $62K | ﹤0.01% |
20,800
+13,700
| +193% | +$46.9K |
|
5603
PUT
PetMed Express
PETS
$41.7M
| $62K | ﹤0.01% |
6,100
+2,600
| +74% | +$32.1K |
|
5604
ProShares Ultra Health Care
RXL
$84.3M
| $62K | ﹤0.01% |
+1,508
| New | +$66.5K |
|
5605
CALL
Sonic Automotive
SAH
$2.9B
| $62K | ﹤0.01% |
+1,300
| New | +$66.1K |
|
5606
CALL
UMB Financial
UMBF
$11.1B
| $62K | ﹤0.01% |
1,000
-500
| -33% | -$32.5K |
|
|
VRNA
5607
DELISTED
Verona Pharma
VRNA
| $62K | ﹤0.01% |
3,854
-24,039
| -86% | -$463K |
|
|
CMBT
5608
PUT
CMB.TECH NV
CMBT
$4.69B
| $62K | ﹤0.01% |
3,800
-900
| -19% | -$14.8K |
|
|
LILM
5609
CALL
DELISTED
Lilium N.V. Class A Ordinary Shares
LILM
| $62K | ﹤0.01% |
88,000
-16,900
| -16% | -$19.7K |
|
5610
PUT
AdaptHealth
AHCO
$1.47B
| $61K | ﹤0.01% |
6,800
+6,300
| +1,260% | +$75.5K |
|
5611
CALL
Alkami Technology
ALKT
$1.94B
| $61K | ﹤0.01% |
3,400
-34,100
| -91% | -$573K |
|
|
AMRN
5612
Amarin Corp
AMRN
$298M
| $61K | ﹤0.01% |
+3,319
| New | +$71.9K |
|
5613
PUT
Ares Management
ARES
$28.9B
| $61K | ﹤0.01% |
600
+300
| +100% | +$30.3K |
|
5614
Banco de Chile
BCH
$20.9B
| $61K | ﹤0.01% |
3,026
-4,703
| -61% | -$99.9K |
|
5615
CALL
BlackSky Technology
BKSY
$943M
| $61K | ﹤0.01% |
6,563
+200
| +3% | +$2.54K |
|
5616
CALL
Backblaze
BLZE
$823M
| $61K | ﹤0.01% |
11,200
+10,600
| +1,767% | +$57.5K |
|
5617
Century Aluminum
CENX
$4.43B
| $61K | ﹤0.01% |
8,601
+562
| +7% | +$4.53K |
|
5618
Marcus Corp
MCS
$897M
| $61K | ﹤0.01% |
3,961
-393
| -9% | -$6.05K |
|
5619
Direxion Daily MSCI Mexico Bull 3X ETF
MEXX
$19.7M
| $61K | ﹤0.01% |
2,663
+2,363
| +788% | +$68.3K |
|
5620
CALL
Mitsubishi UFJ Financial
MUFG
$253B
| $61K | ﹤0.01% |
7,200
+3,100
| +76% | +$24.7K |
|
5621
PUT
McEwen Inc
MUX
$1.03B
| $61K | ﹤0.01% |
9,500
-400
| -4% | -$3.02K |
|
|
SA
5622
CALL
Seabridge Gold
SA
$2.78B
| $61K | ﹤0.01% |
5,800
-4,200
| -42% | -$49.8K |
|
|
SOHU
5623
Sohu.com
SOHU
$362M
| $61K | ﹤0.01% |
+6,505
| New | +$70.4K |
|
5624
CALL
Scholar Rock
SRRK
$5.67B
| $61K | ﹤0.01% |
8,700
+8,400
| +2,800% | +$56.4K |
|
|
SVM
5625
CALL
Silvercorp Metals
SVM
$2.07B
| $61K | ﹤0.01% |
26,300
-44,500
| -63% | -$121K |
|
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.