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 | |
|---|---|---|---|---|---|---|
2876
Madrigal Pharmaceuticals
MDGL
$12.9B
| $823K | ﹤0.01% |
5,636
-17,006
| -75% | -$3.2M |
|
2877
Post Holdings
POST
$4.12B
| $823K | ﹤0.01% |
9,608
+2,514
| +35% | +$219K |
|
|
ABCM
2878
PUT
DELISTED
Abcam PLC
ABCM
| $821K | ﹤0.01% |
36,300
-36,300
| -50% | -$835K |
|
2879
National Grid
NGG
$82.7B
| $820K | ﹤0.01% |
14,367
+13,307
| +1,255% | +$805K |
|
2880
CALL
Evolus
EOLS
$414M
| $818K | ﹤0.01% |
89,600
+88,600
| +8,860% | +$795K |
|
|
FOLD
2881
CALL
DELISTED
Amicus Therapeutics
FOLD
| $818K | ﹤0.01% |
67,300
+50,100
| +291% | +$646K |
|
2882
PUT
Algoma Steel
ASTL
$462M
| $817K | ﹤0.01% |
120,200
+18,700
| +18% | +$134K |
|
2883
Direxion Daily Gold Miners Index Bear 2X ETF
DUST
$67.6M
| $816K | ﹤0.01% |
554
+535
| +2,816% | +$668K |
|
2884
CALL
Community Health Systems
CYH
$379M
| $815K | ﹤0.01% |
281,300
+276,600
| +5,885% | +$1.02M |
|
2885
PUT
Iris Energy
IREN
$13.5B
| $811K | ﹤0.01% |
218,800
+213,400
| +3,952% | +$1.14M |
|
2886
Melco Resorts & Entertainment
MLCO
$2.16B
| $811K | ﹤0.01% |
82,003
-36,898
| -31% | -$428K |
|
2887
PUT
Invesco CurrencyShares British Pound Sterling Trust
FXB
$76.9M
| $810K | ﹤0.01% |
6,900
+3,800
| +123% | +$463K |
|
2888
Ventas
VTR
$48.8B
| $810K | ﹤0.01% |
19,236
+11,335
| +143% | +$511K |
|
2889
PUT
Blue Owl Capital
OWL
$6.57B
| $808K | ﹤0.01% |
62,400
-14,200
| -19% | -$169K |
|
2890
Plug Power
PLUG
$2.96B
| $808K | ﹤0.01% |
106,403
-357,010
| -77% | -$3.49M |
|
2891
CALL
Western Union
WU
$2.56B
| $807K | ﹤0.01% |
61,300
+12,800
| +26% | +$157K |
|
|
RETA
2892
CALL
DELISTED
Reata Pharmaceuticals, Inc. Class A Common Stock
RETA
| $807K | ﹤0.01% |
23,700
-7,600
| -24% | -$1.14M |
|
2893
CALL
Crown Holdings
CCK
$12.9B
| $805K | ﹤0.01% |
9,100
-19,600
| -68% | -$1.76M |
|
2894
Eos Energy Enterprises
EOSE
$1.28B
| $804K | ﹤0.01% |
374,401
-30,482
| -8% | -$91.3K |
|
2895
Rogers Corp
ROG
$2.33B
| $799K | ﹤0.01% |
6,079
+179
| +3% | +$26.7K |
|
2896
CALL
Box
BOX
$4.12B
| $798K | ﹤0.01% |
33,000
-4,300
| -12% | -$123K |
|
2897
CALL
Harmony Gold Mining
HMY
$9.94B
| $798K | ﹤0.01% |
212,300
-27,700
| -12% | -$114K |
|
2898
Iovance Biotherapeutics
IOVA
$2.3B
| $798K | ﹤0.01% |
175,417
+99,375
| +131% | +$649K |
|
2899
CALL
Ginkgo Bioworks
DNA
$496M
| $797K | ﹤0.01% |
11,015
+1,612
| +17% | +$129K |
|
|
GPP
2900
CALL
DELISTED
Green Plains Partners LP
GPP
| $796K | ﹤0.01% |
53,500
+38,400
| +254% | +$532K |
|
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.