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 | |
|---|---|---|---|---|---|---|
2751
PUT
Frontline
FRO
$8.75B
| $918K | ﹤0.01% |
48,900
+1,700
| +4% | +$28.6K |
|
2752
PUT
Glaukos
GKOS
$9.02B
| $918K | ﹤0.01% |
12,200
+11,400
| +1,425% | +$851K |
|
|
FLG
2753
Flagstar Bank National Association
FLG
$5.77B
| $918K | ﹤0.01% |
26,991
-76,331
| -74% | -$2.76M |
|
|
CALY
2754
CALL
Callaway Golf Company
CALY
$3.26B
| $914K | ﹤0.01% |
66,100
-6,400
| -9% | -$112K |
|
2755
Novartis
NVS
$295B
| $914K | ﹤0.01% |
+8,975
| New | +$911K |
|
2756
PUT
SIGA Technologies
SIGA
$223M
| $914K | ﹤0.01% |
174,100
-5,500
| -3% | -$27.1K |
|
2757
CALL
Jackson Financial
JXN
$8.32B
| $913K | ﹤0.01% |
23,900
+13,600
| +132% | +$475K |
|
|
2758
PUT
Jackson Financial
JXN
$8.32B
| $913K | ﹤0.01% |
23,900
-9,000
| -27% | -$314K |
|
|
LKFT
2759
CALL
Lakefront Biotherapeutics American Depositary Shares
LKFT
$1.82B
| $912K | ﹤0.01% |
26,400
+10,200
| +63% | +$397K |
|
2760
CALL
JFrog
FROG
$9.71B
| $910K | ﹤0.01% |
35,900
-1,500
| -4% | -$41.6K |
|
2761
CALL
Trimble
TRMB
$12.3B
| $910K | ﹤0.01% |
16,900
-1,800
| -10% | -$95.3K |
|
2762
CALL
Delek US
DK
$3.87B
| $909K | ﹤0.01% |
32,000
-37,800
| -54% | -$1.02M |
|
2763
Freshpet
FRPT
$2.83B
| $909K | ﹤0.01% |
13,811
+7,893
| +133% | +$566K |
|
2764
CALL
Genius Sports
GENI
$1.73B
| $908K | ﹤0.01% |
170,400
+19,000
| +13% | +$126K |
|
|
2765
JFrog
FROG
$9.71B
| $904K | ﹤0.01% |
35,683
+6,515
| +22% | +$181K |
|
2766
CALL
Bankunited
BKU
$3.38B
| $903K | ﹤0.01% |
39,800
-1,600
| -4% | -$41K |
|
|
CBAY
2767
CALL
DELISTED
Cymabay Therapeutics
CBAY
| $903K | ﹤0.01% |
60,600
-39,100
| -39% | -$518K |
|
2768
PUT
Franklin Resources
BEN
$16.9B
| $902K | ﹤0.01% |
36,700
+22,900
| +166% | +$619K |
|
2769
PUT
Cardlytics
CDLX
$21M
| $902K | ﹤0.01% |
5,470
+5,280
| +2,779% | +$686K |
|
|
NS
2770
CALL
DELISTED
NuStar Energy L.P.
NS
| $901K | ﹤0.01% |
51,700
-58,100
| -53% | -$990K |
|
2771
Scotiabank
BNS
$106B
| $900K | ﹤0.01% |
+19,752
| New | +$947K |
|
2772
PUT
Cincinnati Financial
CINF
$28.3B
| $900K | ﹤0.01% |
8,800
-5,600
| -39% | -$586K |
|
2773
Flywire
FLYW
$1.96B
| $900K | ﹤0.01% |
28,253
+15,848
| +128% | +$507K |
|
2774
Elanco Animal Health
ELAN
$12.4B
| $898K | ﹤0.01% |
79,925
-142,323
| -64% | -$1.65M |
|
|
LNW
2775
PUT
DELISTED
Light & Wonder
LNW
| $898K | ﹤0.01% |
12,600
+10,900
| +641% | +$790K |
|
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.