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 | |
|---|---|---|---|---|---|---|
6276
CALL
Digi International
DGII
$2.6B
| $29K | ﹤0.01% |
1,100
+900
| +450% | +$30.9K |
|
6277
Brinker International
EAT
$9.03B
| $29K | ﹤0.01% |
934
-5,103
| -85% | -$179K |
|
6278
Gildan
GIL
$10.4B
| $29K | ﹤0.01% |
1,055
-697
| -40% | -$20.9K |
|
6279
PUT
Globus Medical
GMED
$10.7B
| $29K | ﹤0.01% |
+600
| New | +$33.5K |
|
|
GRFS
6280
CALL
Grifois
GRFS
$5.28B
| $29K | ﹤0.01% |
3,200
-36,500
| -92% | -$357K |
|
6281
KLA
KLAC
$244B
| $29K | ﹤0.01% |
650
-18,450
| -97% | -$885K |
|
6282
LyondellBasell Industries
LYB
$20B
| $29K | ﹤0.01% |
313
-20,923
| -99% | -$2.01M |
|
6283
Everspin Technologies
MRAM
$342M
| $29K | ﹤0.01% |
3,027
-3,640
| -55% | -$35.2K |
|
6284
CALL
OmniAb
OABI
$283M
| $29K | ﹤0.01% |
+5,600
| New | +$29.9K |
|
6285
CALL
One Stop Systems
OSS
$302M
| $29K | ﹤0.01% |
15,800
+14,700
| +1,336% | +$34.2K |
|
6286
PUT
Patria Investments
PAX
$1.72B
| $29K | ﹤0.01% |
2,000
-3,300
| -62% | -$49K |
|
6287
Resideo Technologies
REZI
$5.17B
| $29K | ﹤0.01% |
1,861
+702
| +61% | +$11.8K |
|
6288
Star Holdings Shares of Beneficial Interest
STHO
$114M
| $29K | ﹤0.01% |
2,364
+1,268
| +116% | +$17.6K |
|
6289
PUT
Stevanato
STVN
$5.4B
| $29K | ﹤0.01% |
+1,000
| New | +$31.3K |
|
|
TGB
6290
CALL
Trekor Metals
TGB
$2.48B
| $29K | ﹤0.01% |
23,200
-100
| -0.4% | -$138 |
|
|
UROY
6291
CALL
Uranium Royalty Corp
UROY
$1.28B
| $29K | ﹤0.01% |
10,400
+5,500
| +112% | +$13K |
|
|
ASXC
6292
PUT
DELISTED
Asensus Surgical, Inc.
ASXC
| $29K | ﹤0.01% |
108,800
+300
| +0.3% | +$109 |
|
|
DMTK
6293
DELISTED
DermTech, Inc. Common Stock
DMTK
| $29K | ﹤0.01% |
20,730
+10,146
| +96% | +$25.4K |
|
|
ILLM
6294
CALL
DELISTED
illumin Holdings Inc. Common Shares
ILLM
| $29K | ﹤0.01% |
+21,700
| New | +$39.2K |
|
|
ACB
6295
PUT
Aurora Cannabis
ACB
$172M
| $28K | ﹤0.01% |
4,800
+1,760
| +58% | +$10.2K |
|
6296
PUT
Arteris
AIP
$1.38B
| $28K | ﹤0.01% |
4,400
-50,100
| -92% | -$344K |
|
6297
CALL
Ardagh Metal Packaging
AMBP
$2.83B
| $28K | ﹤0.01% |
9,200
-700
| -7% | -$2.46K |
|
6298
PUT
Amcor
AMCR
$20.7B
| $28K | ﹤0.01% |
620
+100
| +19% | +$4.82K |
|
6299
Amplify Travel Tech ETF
AWAY
$26M
| $28K | ﹤0.01% |
1,688
-1,110
| -40% | -$19.6K |
|
6300
Bakkt Inc
BKKT
$314M
| $28K | ﹤0.01% |
986
+889
| +916% | +$31.5K |
|
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.