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 | |
|---|---|---|---|---|---|---|
5251
CALL
Wabash National
WNC
$501M
| $86K | ﹤0.01% |
4,100
+1,500
| +58% | +$34.5K |
|
5252
PUT
Corsair Gaming
CRSR
$1.1B
| $85K | ﹤0.01% |
5,900
-4,400
| -43% | -$70.8K |
|
5253
Crane NXT
CXT
$2.97B
| $85K | ﹤0.01% |
1,538
-1,331
| -46% | -$77.2K |
|
5254
CALL
Foster
FSTR
$436M
| $85K | ﹤0.01% |
4,500
+4,200
| +1,400% | +$69.5K |
|
5255
CALL
GeoPark
GPRK
$630M
| $85K | ﹤0.01% |
8,300
+7,900
| +1,975% | +$77.1K |
|
5256
Mid-America Apartment Communities
MAA
$15.5B
| $85K | ﹤0.01% |
666
-73
| -10% | -$10.5K |
|
5257
Ollie's Bargain Outlet
OLLI
$4.43B
| $85K | ﹤0.01% |
+1,107
| New | +$80.8K |
|
5258
CALL
Beyond Air
XAIR
$3.62M
| $85K | ﹤0.01% |
92
-19
| -17% | -$25K |
|
|
HEP
5259
CALL
DELISTED
Holly Energy Partners, L.P.
HEP
| $85K | ﹤0.01% |
3,900
-12,200
| -76% | -$255K |
|
|
AMED
5260
CALL
DELISTED
Amedisys
AMED
| $84K | ﹤0.01% |
900
-1,900
| -68% | -$176K |
|
5261
PUT
Chefs' Warehouse
CHEF
$4.6B
| $84K | ﹤0.01% |
4,000
-17,800
| -82% | -$544K |
|
5262
PUT
Crescent Energy
CRGY
$3.72B
| $84K | ﹤0.01% |
6,700
-7,200
| -52% | -$88.1K |
|
5263
CALL
Fulcrum Therapeutics
FULC
$235M
| $84K | ﹤0.01% |
19,000
+7,500
| +65% | +$32.8K |
|
5264
PUT
Genworth Financial
GNW
$3.78B
| $84K | ﹤0.01% |
14,400
-900
| -6% | -$5.2K |
|
|
KALV
5265
DELISTED
KalVista Pharmaceuticals
KALV
| $84K | ﹤0.01% |
8,810
+7,520
| +583% | +$76.8K |
|
|
NXDR
5266
CALL
Nextdoor Holdings
NXDR
$839M
| $84K | ﹤0.01% |
46,300
-8,300
| -15% | -$20.6K |
|
5267
CALL
KLX Energy Services
KLXE
$43.3M
| $84K | ﹤0.01% |
7,100
+4,700
| +196% | +$52.3K |
|
5268
CALL
American Century Diversified Corporate Bond ETF
KORP
$868M
| $84K | ﹤0.01% |
1,100
-300
| -21% | -$13.5K |
|
|
NOTV
5269
CALL
DELISTED
Inotiv
NOTV
| $84K | ﹤0.01% |
27,500
-58,400
| -68% | -$267K |
|
5270
Oil States International
OIS
$468M
| $84K | ﹤0.01% |
10,073
+5,701
| +130% | +$46.2K |
|
5271
Blue Owl Capital
OWL
$6.93B
| $84K | ﹤0.01% |
6,542
+426
| +7% | +$5.08K |
|
5272
Vuzix
VUZI
$190M
| $84K | ﹤0.01% |
23,201
-106,374
| -82% | -$472K |
|
5273
CALL
WisdomTree
WT
$2.98B
| $84K | ﹤0.01% |
+12,000
| New | +$84K |
|
5274
CALL
Cogent Biosciences
COGT
$6.76B
| $83K | ﹤0.01% |
8,600
+7,500
| +682% | +$89K |
|
5275
KraneShares MSCI China Clean Technology Index ETF
KGRN
$54.9M
| $83K | ﹤0.01% |
3,341
-688
| -17% | -$18.7K |
|
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.