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 | |
|---|---|---|---|---|---|---|
|
ITOS
3051
CALL
DELISTED
iTeos Therapeutics
ITOS
| $686K | ﹤0.01% |
62,700
+58,500
| +1,393% | +$748K |
|
3052
CALL
Teekay Tankers
TNK
$2.63B
| $686K | ﹤0.01% |
16,500
+6,500
| +65% | +$266K |
|
3053
PUT
Copart
CPRT
$27.6B
| $685K | ﹤0.01% |
15,900
-8,700
| -35% | -$387K |
|
3054
PUT
EPR Properties
EPR
$4.85B
| $685K | ﹤0.01% |
16,500
-10,000
| -38% | -$440K |
|
|
EH
3055
CALL
EHang Holdings
EH
$398M
| $684K | ﹤0.01% |
38,000
+20,200
| +113% | +$372K |
|
3056
CALL
Kimbell Royalty Partners
KRP
$1.45B
| $684K | ﹤0.01% |
42,800
+38,200
| +830% | +$579K |
|
3057
CALL
RLX Technology
RLX
$2.49B
| $684K | ﹤0.01% |
453,300
+48,300
| +12% | +$75.7K |
|
3058
SIGA Technologies
SIGA
$222M
| $684K | ﹤0.01% |
130,294
-8,368
| -6% | -$41.2K |
|
3059
PUT
Blink Charging
BLNK
$79.5M
| $682K | ﹤0.01% |
222,900
-41,900
| -16% | -$211K |
|
3060
Hims & Hers Health
HIMS
$7B
| $682K | ﹤0.01% |
108,569
+83,675
| +336% | +$622K |
|
3061
Sphere Entertainment
SPHR
$5.01B
| $682K | ﹤0.01% |
18,374
-8,268
| -31% | -$305K |
|
3062
CALL
Disc Medicine
IRON
$2.85B
| $681K | ﹤0.01% |
14,500
+14,000
| +2,800% | +$700K |
|
3063
CALL
Kodak
KODK
$788M
| $681K | ﹤0.01% |
161,900
+56,000
| +53% | +$274K |
|
3064
CALL
Iris Energy
IREN
$13B
| $680K | ﹤0.01% |
183,300
+163,500
| +826% | +$871K |
|
3065
PUT
VICI Properties
VICI
$29.5B
| $680K | ﹤0.01% |
23,400
-1,200
| -5% | -$37.2K |
|
3066
PUT
Amplify Energy
AMPY
$155M
| $678K | ﹤0.01% |
92,300
-13,300
| -13% | -$91.9K |
|
3067
PUT
Bloomin' Brands
BLMN
$731M
| $678K | ﹤0.01% |
27,600
-17,000
| -38% | -$452K |
|
|
ODP
3068
PUT
DELISTED
ODP
ODP
| $678K | ﹤0.01% |
14,700
+4,600
| +46% | +$221K |
|
3069
Yeti Holdings
YETI
$3.86B
| $677K | ﹤0.01% |
+14,045
| New | +$625K |
|
|
ARR
3070
PUT
Armour Residential REIT
ARR
$2.01B
| $676K | ﹤0.01% |
31,820
+30,540
| +2,386% | +$751K |
|
3071
PUT
Boyd Gaming
BYD
$6.64B
| $675K | ﹤0.01% |
11,100
+4,300
| +63% | +$286K |
|
3072
PUT
RUM Group Inc
RUM
$1.67B
| $675K | ﹤0.01% |
132,500
+56,200
| +74% | +$420K |
|
3073
CALL
Ameren
AEE
$31B
| $673K | ﹤0.01% |
9,000
-900
| -9% | -$73.4K |
|
3074
CALL
Ring Energy
REI
$297M
| $673K | ﹤0.01% |
345,600
+74,200
| +27% | +$149K |
|
3075
Service Corp International
SCI
$11.4B
| $673K | ﹤0.01% |
+11,783
| New | +$744K |
|
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.