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 | |
|---|---|---|---|---|---|---|
5801
CALL
Miller Industries
MLR
$573M
| $50K | ﹤0.01% |
+1,300
| New | +$49.8K |
|
|
OPI
5802
PUT
DELISTED
Office Properties Income Trust
OPI
| $50K | ﹤0.01% |
12,400
+7,100
| +134% | +$49.3K |
|
5803
CALL
OraSure Technologies
OSUR
$279M
| $50K | ﹤0.01% |
8,500
-1,600
| -16% | -$8.98K |
|
5804
PUT
Sabra Healthcare REIT
SBRA
$5.34B
| $50K | ﹤0.01% |
3,600
+2,300
| +177% | +$29.4K |
|
5805
CALL
System1
SST
$14.3M
| $50K | ﹤0.01% |
4,190
-670
| -14% | -$16.1K |
|
5806
PUT
VirTra
VTSI
$34.9M
| $50K | ﹤0.01% |
9,000
-100
| -1% | -$679 |
|
5807
PUT
Vuzix
VUZI
$194M
| $50K | ﹤0.01% |
14,000
-23,800
| -63% | -$106K |
|
|
EXAI
5808
CALL
DELISTED
Exscientia Plc American Depositary Shares
EXAI
| $50K | ﹤0.01% |
11,200
-400
| -3% | -$2.58K |
|
|
EVA
5809
CALL
DELISTED
Enviva Inc.
EVA
| $50K | ﹤0.01% |
6,700
+1,100
| +20% | +$11.4K |
|
|
VRTV
5810
CALL
DELISTED
VERITIV CORPORATION
VRTV
| $50K | ﹤0.01% |
+300
| New | +$46.5K |
|
|
AXLA
5811
PUT
DELISTED
Axcella Health Inc. Common Stock
AXLA
| $50K | ﹤0.01% |
4,800
+4,616
| +2,509% | +$36.3K |
|
|
ABK
5812
PUT
DELISTED
Ambac Financial Group
ABK
| $50K | ﹤0.01% |
4,200
-6,600
| -61% | -$78.6K |
|
5813
Allegion
ALLE
$13.4B
| $49K | ﹤0.01% |
+475
| New | +$53.5K |
|
5814
CALL
BlueLinx
BXC
$422M
| $49K | ﹤0.01% |
600
-2,000
| -77% | -$176K |
|
|
CODX
5815
CALL
Co-Diagnostics
CODX
$5.31M
| $49K | ﹤0.01% |
1,550
+420
| +37% | +$15.9K |
|
5816
Dick's Sporting Goods
DKS
$17.5B
| $49K | ﹤0.01% |
+455
| New | +$57.6K |
|
5817
CALL
Gain Therapeutics
GANX
$71.7M
| $49K | ﹤0.01% |
15,100
-28,100
| -65% | -$107K |
|
5818
CALL
Golub Capital BDC
GBDC
$3.34B
| $49K | ﹤0.01% |
3,400
+2,300
| +209% | +$32.6K |
|
5819
CALL
Getty Images
GETY
$156M
| $49K | ﹤0.01% |
7,600
-2,100
| -22% | -$10.6K |
|
5820
CALL
Kirby Corp
KEX
$7.01B
| $49K | ﹤0.01% |
600
+100
| +20% | +$8.08K |
|
5821
PUT
Maravai LifeSciences
MRVI
$969M
| $49K | ﹤0.01% |
4,900
-286,400
| -98% | -$3.14M |
|
5822
PUT
Planet Labs
PL
$7.3B
| $49K | ﹤0.01% |
19,000
+5,500
| +41% | +$17.5K |
|
5823
CALL
Powell Industries
POWL
$7.6B
| $49K | ﹤0.01% |
1,800
+1,500
| +500% | +$37.2K |
|
5824
CALL
Surgery Partners
SGRY
$2.01B
| $49K | ﹤0.01% |
1,700
-75,900
| -98% | -$2.73M |
|
5825
PUT
Smith & Nephew
SNN
$13.3B
| $49K | ﹤0.01% |
2,000
-1,400
| -41% | -$39.3K |
|
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.