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 | |
|---|---|---|---|---|---|---|
|
IAS
4451
PUT
DELISTED
Integral Ad Science
IAS
| $181K | ﹤0.01% |
15,300
+15,000
| +5,000% | +$232K |
|
|
NNDM
4452
PUT
Nano Dimension
NNDM
$314M
| $181K | ﹤0.01% |
66,900
+1,500
| +2% | +$4.36K |
|
4453
PUT
Surgery Partners
SGRY
$2.15B
| $181K | ﹤0.01% |
6,200
+3,300
| +114% | +$119K |
|
4454
PUT
Altimmune
ALT
$568M
| $180K | ﹤0.01% |
69,400
+30,800
| +80% | +$88.4K |
|
4455
CALL
Eagle Bancorp
EGBN
$850M
| $180K | ﹤0.01% |
8,400
+3,900
| +87% | +$94.9K |
|
4456
CALL
Mueller Industries
MLI
$14.5B
| $180K | ﹤0.01% |
9,600
-15,200
| -61% | -$301K |
|
4457
Vanguard Long-Term Corporate Bond ETF
VCLT
$8.81B
| $180K | ﹤0.01% |
+2,520
| New | +$190K |
|
4458
Vanguard FTSE Emerging Markets ETF
VWO
$117B
| $180K | ﹤0.01% |
4,595
+4,466
| +3,462% | +$182K |
|
|
TELL
4459
DELISTED
Tellurian Inc.
TELL
| $180K | ﹤0.01% |
155,549
-218,240
| -58% | -$297K |
|
|
NXGN
4460
CALL
DELISTED
NextGen Healthcare, Inc. Common Stock
NXGN
| $180K | ﹤0.01% |
+7,600
| New | +$143K |
|
|
4461
Altimmune
ALT
$568M
| $179K | ﹤0.01% |
68,998
+20,662
| +43% | +$59.3K |
|
4462
PUT
MasterCraft Boat Holdings
MCFT
$596M
| $179K | ﹤0.01% |
8,100
+2,600
| +47% | +$66.8K |
|
4463
CALL
TD Synnex
SNX
$19.9B
| $179K | ﹤0.01% |
1,800
+1,100
| +157% | +$109K |
|
|
SILV
4464
CALL
DELISTED
SilverCrest Metals Inc. Common Shares
SILV
| $179K | ﹤0.01% |
40,800
+15,200
| +59% | +$77.3K |
|
4465
PUT
Clean Energy Fuels
CLNE
$416M
| $178K | ﹤0.01% |
46,600
-1,300
| -3% | -$5.79K |
|
4466
CALL
Conduent
CNDT
$253M
| $178K | ﹤0.01% |
51,400
+41,700
| +430% | +$139K |
|
4467
CALL
FIGS
FIGS
$1.76B
| $178K | ﹤0.01% |
30,300
-57,600
| -66% | -$383K |
|
4468
CALL
IDT Corp
IDT
$1.67B
| $178K | ﹤0.01% |
+8,100
| New | +$191K |
|
|
NINE
4469
CALL
DELISTED
Nine Energy Service
NINE
| $178K | ﹤0.01% |
43,400
+31,800
| +274% | +$143K |
|
4470
PUT
Portillo's
PTLO
$345M
| $178K | ﹤0.01% |
11,600
+1,300
| +13% | +$25.4K |
|
4471
PUT
Smith & Wesson
SWBI
$649M
| $178K | ﹤0.01% |
13,800
-10,700
| -44% | -$134K |
|
4472
ProShares UltraShort Yen
YCS
$31.5M
| $178K | ﹤0.01% |
4,760
-3,992
| -46% | -$138K |
|
|
SBDS
4473
DELISTED
Solo Brands Inc
SBDS
| $178K | ﹤0.01% |
875
+653
| +294% | +$142K |
|
4474
CALL
Axos Financial
AX
$5.58B
| $177K | ﹤0.01% |
4,700
+1,800
| +62% | +$76.1K |
|
4475
Domo
DOMO
$171M
| $177K | ﹤0.01% |
18,098
+11,330
| +167% | +$157K |
|
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.