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 | |
|---|---|---|---|---|---|---|
6751
Energy Recovery
ERII
$435M
| $17K | ﹤0.01% |
+836
| New | +$22.3K |
|
6752
Hydrofarm Holdings
HYFM
$2.82M
| $17K | ﹤0.01% |
1,427
-429
| -23% | -$4.79K |
|
6753
CALL
Immunic
IMUX
$191M
| $17K | ﹤0.01% |
1,170
-880
| -43% | -$16.9K |
|
6754
Innoviz Technologies
INVZ
$93.2M
| $17K | ﹤0.01% |
9,154
-346,276
| -97% | -$931K |
|
|
JAMF
6755
PUT
DELISTED
Jamf
JAMF
| $17K | ﹤0.01% |
1,000
-200
| -17% | -$3.71K |
|
6756
Southwest Airlines
LUV
$22.3B
| $17K | ﹤0.01% |
640
-212,840
| -100% | -$6.94M |
|
|
MRUS
6757
DELISTED
Merus
MRUS
| $17K | ﹤0.01% |
+741
| New | +$18K |
|
6758
AdvisorShares MSOS 2X Daily ETF
MSOX
$49.4M
| $17K | ﹤0.01% |
155
+118
| +319% | +$9.46K |
|
|
NAAS
6759
PUT
NaaS Technology Inc
NAAS
$53.6M
| $17K | ﹤0.01% |
16
+3
| +23% | +$5.49K |
|
|
NAK
6760
Northern Dynasty Minerals
NAK
$779M
| $17K | ﹤0.01% |
54,000
-10,000
| -16% | -$2.83K |
|
|
NAK
6761
PUT
Northern Dynasty Minerals
NAK
$779M
| $17K | ﹤0.01% |
53,400
-8,700
| -14% | -$2.46K |
|
|
NTST
6762
PUT
NETSTREIT Corp
NTST
$2.1B
| $17K | ﹤0.01% |
+1,100
| New | +$19K |
|
6763
News Corp Class B
NWS
$17.2B
| $17K | ﹤0.01% |
859
-450
| -34% | -$9.32K |
|
6764
CALL
Paysign
PAYS
$512M
| $17K | ﹤0.01% |
8,800
-22,200
| -72% | -$45.8K |
|
6765
CALL
Perdoceo Education
PRDO
$2.04B
| $17K | ﹤0.01% |
+1,000
| New | +$15.2K |
|
6766
PUT
Rani Therapeutics
RANI
$92.2M
| $17K | ﹤0.01% |
8,100
-2,900
| -26% | -$11.1K |
|
6767
CALL
Reynolds Consumer Products
REYN
$5.32B
| $17K | ﹤0.01% |
700
| – | – |
|
6768
Rackspace Technology
RXT
$1.07B
| $17K | ﹤0.01% |
+7,260
| New | +$16.5K |
|
6769
PUT
Vivid Seats
SEAT
$83.2M
| $17K | ﹤0.01% |
+135
| New | +$19.9K |
|
6770
PUT
Tarsus Pharmaceuticals
TARS
$2.6B
| $17K | ﹤0.01% |
+1,000
| New | +$17.7K |
|
6771
TFS Financial
TFSL
$5.06B
| $17K | ﹤0.01% |
1,479
+1,020
| +222% | +$13.7K |
|
6772
Kartoon Studios
TOON
$35.1M
| $17K | ﹤0.01% |
12,771
-1,749
| -12% | -$3.11K |
|
6773
CALL
Veracyte
VCYT
$4.77B
| $17K | ﹤0.01% |
800
+700
| +700% | +$18K |
|
6774
CALL
WaFd
WAFD
$2.69B
| $17K | ﹤0.01% |
+700
| New | +$19.6K |
|
6775
CALL
Workhorse Group
WKHS
$34.5M
| $17K | ﹤0.01% |
14
-9
| -39% | -$23.1K |
|
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.