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 | |
|---|---|---|---|---|---|---|
|
CAN
6526
PUT
Canaan Creative
CAN
$182M
| $22K | ﹤0.01% |
12,200
-30,100
| -71% | -$71K |
|
|
CKPT
6527
CALL
DELISTED
Checkpoint Therapeutics
CKPT
| $22K | ﹤0.01% |
13,400
-17,300
| -56% | -$39.3K |
|
6528
Caribou Biosciences
CRBU
$150M
| $22K | ﹤0.01% |
4,622
-3,439
| -43% | -$21.3K |
|
6529
PUT
Torrid Holdings
CURV
$260M
| $22K | ﹤0.01% |
10,200
+6,300
| +162% | +$14.6K |
|
6530
CALL
First American
FAF
$7.71B
| $22K | ﹤0.01% |
400
-200
| -33% | -$12K |
|
6531
PUT
Gray Television
GTN
$417M
| $22K | ﹤0.01% |
3,200
+2,200
| +220% | +$18.1K |
|
6532
PUT
Harmonic Inc
HLIT
$1.22B
| $22K | ﹤0.01% |
2,300
+800
| +53% | +$9.54K |
|
|
ICAD
6533
CALL
DELISTED
iCAD Inc
ICAD
| $22K | ﹤0.01% |
+10,600
| New | +$25.2K |
|
6534
InflaRx
IFRX
$253M
| $22K | ﹤0.01% |
7,482
-17,450
| -70% | -$66.4K |
|
6535
PUT
Kaiser Aluminum
KALU
$2.61B
| $22K | ﹤0.01% |
300
+200
| +200% | +$15.2K |
|
6536
PUT
Moelis & Co
MC
$5.08B
| $22K | ﹤0.01% |
500
-900
| -64% | -$42.4K |
|
6537
Global X MLP ETF
MLPA
$2.28B
| $22K | ﹤0.01% |
+504
| New | +$22.1K |
|
6538
CALL
Nurix Therapeutics
NRIX
$2.45B
| $22K | ﹤0.01% |
2,900
-600
| -17% | -$5.48K |
|
6539
CALL
NETSCOUT
NTCT
$2.91B
| $22K | ﹤0.01% |
800
+500
| +167% | +$14.3K |
|
6540
Paysign
PAYS
$512M
| $22K | ﹤0.01% |
+11,675
| New | +$24.1K |
|
6541
PUT
Playboy Inc
PLBY
$133M
| $22K | ﹤0.01% |
28,100
-43,300
| -61% | -$62.1K |
|
6542
Polestar Automotive Holding UK
PSNY
$2.05B
| $22K | ﹤0.01% |
280
-3,732
| -93% | -$414K |
|
6543
Dr. Reddy's Laboratories
RDY
$9.85B
| $22K | ﹤0.01% |
+1,690
| New | +$22.9K |
|
6544
Richardson Electronics
RELL
$265M
| $22K | ﹤0.01% |
+2,100
| New | +$27.1K |
|
6545
CALL
Rafael Holdings
RFL
$104M
| $22K | ﹤0.01% |
12,067
-25,552
| -68% | -$54.1K |
|
6546
CALL
Relay Therapeutics
RLAY
$4.24B
| $22K | ﹤0.01% |
2,700
-3,300
| -55% | -$35.5K |
|
6547
PUT
ReNew
RNW
$2.25B
| $22K | ﹤0.01% |
4,100
-12,600
| -75% | -$74.3K |
|
6548
PUT
Spire
SR
$4.76B
| $22K | ﹤0.01% |
400
+200
| +100% | +$12.1K |
|
6549
UFP Industries
UFPI
$4.87B
| $22K | ﹤0.01% |
220
-1,280
| -85% | -$129K |
|
6550
WisdomTree Floating Rate Treasury Fund
USFR
$18.1B
| $22K | ﹤0.01% |
+453
| New | +$22.8K |
|
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.