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 | |
|---|---|---|---|---|---|---|
6301
PUT
Backblaze
BLZE
$823M
| $28K | ﹤0.01% |
5,100
+100
| +2% | +$542 |
|
|
DAWN
6302
PUT
DELISTED
Day One Biopharmaceuticals
DAWN
| $28K | ﹤0.01% |
2,300
-1,200
| -34% | -$15.7K |
|
|
EFXT
6303
Enerflex
EFXT
$2.74B
| $28K | ﹤0.01% |
4,944
+4,484
| +975% | +$30.1K |
|
6304
CALL
FB Financial Corp
FBK
$3B
| $28K | ﹤0.01% |
1,000
-20,200
| -95% | -$627K |
|
6305
CALL
Fidus Investment
FDUS
$747M
| $28K | ﹤0.01% |
1,500
-1,400
| -48% | -$27.6K |
|
6306
Federal Realty Investment Trust
FRT
$10.8B
| $28K | ﹤0.01% |
+317
| New | +$31.2K |
|
6307
CALL
Flotek Industries
FTK
$828M
| $28K | ﹤0.01% |
+6,500
| New | +$30.9K |
|
6308
Gain Therapeutics
GANX
$72.1M
| $28K | ﹤0.01% |
+8,650
| New | +$32.8K |
|
|
HIVE
6309
PUT
HIVE Digital Technologies
HIVE
$780M
| $28K | ﹤0.01% |
9,100
+1,500
| +20% | +$6.39K |
|
|
HTBK
6310
PUT
DELISTED
Heritage Commerce
HTBK
| $28K | ﹤0.01% |
3,400
+3,200
| +1,600% | +$28.5K |
|
6311
iShares 10+ Year Investment Grade Corporate Bond ETF
IGLB
$2.61B
| $28K | ﹤0.01% |
594
+510
| +607% | +$25.3K |
|
|
INZY
6312
PUT
DELISTED
Inozyme Pharma
INZY
| $28K | ﹤0.01% |
+6,800
| New | +$34.6K |
|
|
JAMF
6313
CALL
DELISTED
Jamf
JAMF
| $28K | ﹤0.01% |
1,600
+100
| +7% | +$1.85K |
|
6314
Karyopharm Therapeutics
KPTI
$44.2M
| $28K | ﹤0.01% |
+1,434
| New | +$32.2K |
|
6315
PUT
Kilroy Realty
KRC
$4.53B
| $28K | ﹤0.01% |
900
-5,100
| -85% | -$177K |
|
6316
CALL
Lakeland Industries
LAKE
$111M
| $28K | ﹤0.01% |
1,900
+1,400
| +280% | +$20.8K |
|
|
MVO
6317
CALL
DELISTED
MV Oil Trust
MVO
| $28K | ﹤0.01% |
2,100
-400
| -16% | -$5.08K |
|
6318
CALL
Magnachip Semiconductor
MX
$118M
| $28K | ﹤0.01% |
3,400
+1,600
| +89% | +$14K |
|
6319
CALL
Energy Vault
NRGV
$517M
| $28K | ﹤0.01% |
11,100
-299,000
| -96% | -$895K |
|
|
6320
Energy Vault
NRGV
$517M
| $28K | ﹤0.01% |
11,152
-32,175
| -74% | -$96.3K |
|
6321
Power Integrations
POWI
$3.45B
| $28K | ﹤0.01% |
+379
| New | +$32.4K |
|
6322
Ribbon Communications
RBBN
$379M
| $28K | ﹤0.01% |
10,759
+887
| +9% | +$2.59K |
|
6323
CALL
ReNew
RNW
$2.25B
| $28K | ﹤0.01% |
5,300
-29,900
| -85% | -$176K |
|
6324
PUT
Runway Growth Finance
RWAY
$231M
| $28K | ﹤0.01% |
2,200
| – | – |
|
6325
The Bancorp
TBBK
$2.81B
| $28K | ﹤0.01% |
831
+731
| +731% | +$26.6K |
|
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.