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 | |
|---|---|---|---|---|---|---|
2301
CALL
H&R Block
HRB
$5.18B
| $1.54M | ﹤0.01% |
35,800
-1,900
| -5% | -$70.2K |
|
2302
Weibo
WB
$1.9B
| $1.54M | ﹤0.01% |
122,928
-33,267
| -21% | -$443K |
|
2303
PUT
Bankunited
BKU
$3.38B
| $1.54M | ﹤0.01% |
67,800
+12,100
| +22% | +$310K |
|
2304
PUT
Lemonade
LMND
$4.62B
| $1.54M | ﹤0.01% |
132,400
+61,800
| +88% | +$991K |
|
2305
CALL
Applied Optoelectronics
AAOI
$8.04B
| $1.53M | ﹤0.01% |
140,000
+80,300
| +135% | +$852K |
|
2306
PUT
Louisiana-Pacific
LPX
$5.2B
| $1.52M | ﹤0.01% |
27,600
+700
| +3% | +$46K |
|
2307
CALL
Bumble
BMBL
$367M
| $1.52M | ﹤0.01% |
102,200
+29,500
| +41% | +$499K |
|
2308
Expedia Group
EXPE
$31.2B
| $1.52M | ﹤0.01% |
14,783
-22,397
| -60% | -$2.47M |
|
2309
CALL
Arch Capital
ACGL
$36.1B
| $1.52M | ﹤0.01% |
19,100
+17,400
| +1,024% | +$1.35M |
|
2310
Arcus Biosciences
RCUS
$3.57B
| $1.52M | ﹤0.01% |
84,793
-39,748
| -32% | -$799K |
|
2311
CALL
Tencent Music
TME
$14.5B
| $1.52M | ﹤0.01% |
238,700
+38,300
| +19% | +$255K |
|
2312
CALL
Olin
OLN
$2.64B
| $1.52M | ﹤0.01% |
30,400
+18,600
| +158% | +$1M |
|
2313
CALL
Saia
SAIA
$11.3B
| $1.51M | ﹤0.01% |
3,800
-4,800
| -56% | -$1.94M |
|
2314
DTE Energy
DTE
$31.1B
| $1.51M | ﹤0.01% |
15,242
+14,301
| +1,520% | +$1.54M |
|
2315
CALL
VSE Corp
VSEC
$5.48B
| $1.51M | ﹤0.01% |
+30,000
| New | +$1.63M |
|
2316
Penumbra
PEN
$12.5B
| $1.51M | ﹤0.01% |
+6,251
| New | +$1.74M |
|
2317
CALL
ICICI Bank
IBN
$106B
| $1.51M | ﹤0.01% |
65,300
+8,700
| +15% | +$205K |
|
2318
PUT
Darling Ingredients
DAR
$9.93B
| $1.5M | ﹤0.01% |
28,800
-58,800
| -67% | -$3.67M |
|
2319
Magna International
MGA
$17.9B
| $1.5M | ﹤0.01% |
28,037
+24,739
| +750% | +$1.44M |
|
2320
PUT
BlackBerry
BB
$5.01B
| $1.5M | ﹤0.01% |
318,900
-107,600
| -25% | -$529K |
|
2321
PUT
Macerich
MAC
$7.32B
| $1.5M | ﹤0.01% |
137,700
+15,100
| +12% | +$180K |
|
2322
PUT
Marqeta
MQ
$1.8B
| $1.5M | ﹤0.01% |
62,625
-235,350
| -79% | -$5.34M |
|
|
NXGN
2323
PUT
DELISTED
NextGen Healthcare, Inc. Common Stock
NXGN
| $1.5M | ﹤0.01% |
63,100
+63,000
| +63,000% | +$1.19M |
|
2324
Constellation Energy
CEG
$98B
| $1.5M | ﹤0.01% |
13,709
-10,445
| -43% | -$1.08M |
|
2325
NexGen Energy
NXE
$6.05B
| $1.49M | ﹤0.01% |
+250,226
| New | +$1.3M |
|
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.