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 |
Alibaba
BABA
|
+$120M |
| 2 |
Alphabet (Google) Class A
GOOGL
|
+$93.9M |
| 3 |
Walt Disney
DIS
|
+$71.7M |
| 4 |
KraneShares CSI China Internet ETF
KWEB
|
+$41.7M |
| 5 |
Citigroup
C
|
+$39.4M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$136M |
| 2 |
Amazon
AMZN
|
+$118M |
| 3 |
SPDR Gold Trust
GLD
|
+$56.2M |
| 4 |
Microsoft
MSFT
|
+$52.4M |
| 5 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$45.6M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.33% |
| 2 | Consumer Discretionary | 0.3% |
| 3 | Communication Services | 0.21% |
| 4 | Financials | 0.19% |
| 5 | Healthcare | 0.19% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
6651
PUT
Vaalco Energy
EGY
$540M
| $27K | ﹤0.01% |
6,200
-5,200
| -46% | -$22.9K |
|
|
EPIX
6652
DELISTED
ESSA Pharma
EPIX
| $27K | ﹤0.01% |
4,182
+513
| +14% | +$2.53K |
|
6653
Element Solutions
ESI
$8.89B
| $27K | ﹤0.01% |
1,202
-8,872
| -88% | -$179K |
|
|
EXK
6654
PUT
Endeavour Silver
EXK
$2.29B
| $27K | ﹤0.01% |
14,100
-11,500
| -45% | -$25K |
|
6655
CALL
Fidus Investment
FDUS
$766M
| $27K | ﹤0.01% |
1,400
-100
| -7% | -$1.91K |
|
6656
CALL
Fulton Financial
FULT
$4.73B
| $27K | ﹤0.01% |
1,700
-200
| -11% | -$2.81K |
|
|
GRFS
6657
PUT
Grifois
GRFS
$5.44B
| $27K | ﹤0.01% |
2,400
-4,800
| -67% | -$44.7K |
|
|
HYFT
6658
CALL
MindWalk Holdings
HYFT
$63.5M
| $27K | ﹤0.01% |
+15,800
| New | +$23.4K |
|
|
IRS
6659
PUT
IRSA Inversiones y Representaciones
IRS
$1.3B
| $27K | ﹤0.01% |
3,315
+731
| +28% | +$5.2K |
|
6660
KNOT Offshore Partners
KNOP
$352M
| $27K | ﹤0.01% |
+4,779
| New | +$27.9K |
|
|
KREF
6661
PUT
KKR Real Estate Finance Trust
KREF
$471M
| $27K | ﹤0.01% |
2,100
-800
| -28% | -$9.59K |
|
6662
CALL
AEye
LIDR
$49.6M
| $27K | ﹤0.01% |
11,800
+11,327
| +2,395% | +$55.6K |
|
6663
CALL
Magnachip Semiconductor
MX
$118M
| $27K | ﹤0.01% |
3,600
+200
| +6% | +$1.46K |
|
|
OTLY
6664
PUT
Oatly Group
OTLY
$473M
| $27K | ﹤0.01% |
1,180
-1,485
| -56% | -$24.5K |
|
|
PPTA
6665
Perpetua Resources
PPTA
$2.18B
| $27K | ﹤0.01% |
8,701
+7,708
| +776% | +$26K |
|
6666
CALL
Progress Software
PRGS
$1.66B
| $27K | ﹤0.01% |
500
+200
| +67% | +$10.6K |
|
6667
PUT
Rani Therapeutics
RANI
$92.1M
| $27K | ﹤0.01% |
8,200
+100
| +1% | +$231 |
|
6668
Resources Connection
RGP
$136M
| $27K | ﹤0.01% |
+1,908
| New | +$26.7K |
|
|
RPTX
6669
CALL
DELISTED
Repare Therapeutics
RPTX
| $27K | ﹤0.01% |
3,800
-50,700
| -93% | -$284K |
|
|
SLI
6670
CALL
Standard Lithium
SLI
$498M
| $27K | ﹤0.01% |
13,600
-18,000
| -57% | -$44.9K |
|
6671
CALL
Sonoco
SON
$5.99B
| $27K | ﹤0.01% |
500
-1,100
| -69% | -$59.7K |
|
6672
SiriusPoint
SPNT
$3.09B
| $27K | ﹤0.01% |
2,345
+370
| +19% | +$3.9K |
|
6673
PUT
STAG Industrial
STAG
$7.79B
| $27K | ﹤0.01% |
700
-600
| -46% | -$21.3K |
|
6674
CALL
Kartoon Studios
TOON
$34.8M
| $27K | ﹤0.01% |
19,600
-800
| -4% | -$1.03K |
|
6675
Direxion Daily Utilities Bull 3X ETF
UTSL
$43.4M
| $27K | ﹤0.01% |
1,311
+1,300
| +11,818% | +$25.1K |
|
Similar funds
Simplex Trading's Q4 2023 Portfolio in Review
As of Q4 2023, Simplex Trading held 10,333 positions worth $156B, up 23% from $127B the previous quarter. Its ten largest holdings account for 42% of the portfolio.
Simplex Trading deployed $15.1B of net new capital in Q4 2023, opening 1,639 new positions and adding to 3,920 existing holdings. Its largest new stake was Walt Disney: 812,984 shares worth $73.4M.
By sector, the portfolio is most concentrated in Technology at 0.33% of assets, down from 0.44% a quarter earlier, followed by Consumer Discretionary and Communication Services.
On the sell side, the largest reduction was iShares 20+ Year Treasury Bond ETF, an estimated $136M trimmed.
- Simplex Trading's largest Q4 2023 buy was Walt Disney: 812,984 shares worth $73.4M.
- Simplex Trading added most to Alibaba in Q4 2023, an estimated $120M increase.
- Simplex Trading's biggest Q4 2023 reduction was iShares 20+ Year Treasury Bond ETF, cutting an estimated $136M.
- Simplex Trading fully exited Amazon in Q4 2023, selling an estimated $118M.
- Simplex Trading's ten largest holdings make up 42% of its $156B portfolio in Q4 2023.
- Simplex Trading opened 1,639 new positions and closed 1,508 in Q4 2023.
- Simplex Trading's portfolio value rose 23% quarter-over-quarter to $156B.
Based on Simplex Trading's 13F filing for Q4 2023, filed 2 Feb 2024.