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 | |
|---|---|---|---|---|---|---|
4976
General Dynamics
GD
$103B
| $112K | ﹤0.01% |
507
-25,349
| -98% | -$5.61M |
|
4977
PUT
Haleon
HLN
$44.5B
| $112K | ﹤0.01% |
13,500
-400
| -3% | -$3.33K |
|
4978
iShares Russell Mid-Cap ETF
IWR
$56.1B
| $112K | ﹤0.01% |
+1,623
| New | +$118K |
|
4979
CALL
Avita Medical
RCEL
$138M
| $112K | ﹤0.01% |
7,700
+6,200
| +413% | +$105K |
|
4980
CALL
Summit Therapeutics
SMMT
$10.7B
| $112K | ﹤0.01% |
60,000
+52,800
| +733% | +$101K |
|
4981
CALL
Veeco
VECO
$2.95B
| $112K | ﹤0.01% |
4,000
+3,800
| +1,900% | +$105K |
|
|
SBDS
4982
CALL
DELISTED
Solo Brands Inc
SBDS
| $112K | ﹤0.01% |
553
+320
| +137% | +$69.8K |
|
4983
Biohaven
BHVN
$2.08B
| $111K | ﹤0.01% |
4,290
-18,043
| -81% | -$375K |
|
4984
CALL
Ormat Technologies
ORA
$5.94B
| $111K | ﹤0.01% |
1,600
+200
| +14% | +$15.5K |
|
4985
PUT
WPP
WPP
$4.41B
| $111K | ﹤0.01% |
+2,500
| New | +$125K |
|
4986
PUT
United Parks & Resorts
PRKS
$2.15B
| $111K | ﹤0.01% |
2,400
-3,400
| -59% | -$173K |
|
4987
Hexcel
HXL
$7.76B
| $110K | ﹤0.01% |
+1,701
| New | +$121K |
|
|
VRE
4988
CALL
DELISTED
Veris Residential
VRE
| $110K | ﹤0.01% |
6,700
-1,500
| -18% | -$26.4K |
|
|
QVCGA
4989
CALL
DELISTED
QVC Group Inc Series A
QVCGA
| $110K | ﹤0.01% |
3,644
+3,020
| +484% | +$127K |
|
4990
PUT
Acumen Pharmaceuticals
ABOS
$157M
| $109K | ﹤0.01% |
+26,400
| New | +$163K |
|
4991
CALL
Itron
ITRI
$4.33B
| $109K | ﹤0.01% |
1,800
+1,100
| +157% | +$75.5K |
|
4992
PUT
Liberty Broadband Class C
LBRDK
$4.79B
| $109K | ﹤0.01% |
1,200
-1,600
| -57% | -$143K |
|
|
SVM
4993
PUT
Silvercorp Metals
SVM
$2.13B
| $109K | ﹤0.01% |
46,700
-1,900
| -4% | -$5.15K |
|
4994
PUT
Zymeworks
ZYME
$1.67B
| $109K | ﹤0.01% |
17,300
-82,200
| -83% | -$607K |
|
|
PDCO
4995
PUT
DELISTED
Patterson Companies, Inc.
PDCO
| $109K | ﹤0.01% |
3,700
+1,500
| +68% | +$47.6K |
|
4996
CALL
Arlo Technologies
ARLO
$1.57B
| $108K | ﹤0.01% |
10,500
-6,800
| -39% | -$72.2K |
|
4997
PUT
Alphatec Holdings
ATEC
$1.49B
| $108K | ﹤0.01% |
8,400
-800
| -9% | -$12.5K |
|
4998
Santander
BSBR
$37.8B
| $108K | ﹤0.01% |
21,062
+19,563
| +1,305% | +$111K |
|
4999
CALL
Globus Maritime Ltd
GLBS
$63.9M
| $108K | ﹤0.01% |
59,100
-300
| -0.5% | -$296 |
|
5000
Gentex
GNTX
$5.03B
| $108K | ﹤0.01% |
3,333
+2,045
| +159% | +$65.6K |
|
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.