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 | |
|---|---|---|---|---|---|---|
4651
CALL
Sally Beauty Holdings
SBH
$1.47B
| $208K | ﹤0.01% |
15,700
+14,200
| +947% | +$138K |
|
4652
CALL
Scholar Rock
SRRK
$5.88B
| $208K | ﹤0.01% |
11,100
+2,400
| +28% | +$29.8K |
|
4653
CALL
Wipro
WIT
$19.5B
| $208K | ﹤0.01% |
74,800
+71,400
| +2,100% | +$173K |
|
|
ETWO
4654
CALL
DELISTED
E2open Parent Holdings
ETWO
| $207K | ﹤0.01% |
47,200
+3,000
| +7% | +$10.6K |
|
4655
CALL
ePlus
PLUS
$2.43B
| $207K | ﹤0.01% |
2,600
+2,300
| +767% | +$154K |
|
4656
Sinclair Inc
SBGI
$1.02B
| $207K | ﹤0.01% |
15,893
+13,833
| +672% | +$170K |
|
4657
CALL
USA Compression Partners
USAC
$3.69B
| $207K | ﹤0.01% |
9,100
+3,600
| +65% | +$89.3K |
|
4658
PUT
Worthington Enterprises
WOR
$2.74B
| $207K | ﹤0.01% |
4,200
+632
| +18% | +$27.8K |
|
4659
CALL
Revolution Medicines
RVMD
$38.5B
| $206K | ﹤0.01% |
7,200
-20,300
| -74% | -$488K |
|
4660
PUT
Hayward Holdings
HAYW
$3.23B
| $205K | ﹤0.01% |
15,100
+900
| +6% | +$11.1K |
|
4661
PUT
uniQure
QURE
$2.78B
| $205K | ﹤0.01% |
30,300
-2,900
| -9% | -$19.2K |
|
4662
CALL
Tenaris
TS
$28.2B
| $205K | ﹤0.01% |
5,900
-14,400
| -71% | -$483K |
|
|
INST
4663
CALL
DELISTED
Instructure Holdings, Inc.
INST
| $205K | ﹤0.01% |
7,600
+2,200
| +41% | +$57K |
|
|
INBX
4664
PUT
DELISTED
Inhibrx, Inc. Common Stock
INBX
| $205K | ﹤0.01% |
5,400
+4,600
| +575% | +$98.6K |
|
4665
PUT
Geron
GERN
$898M
| $204K | ﹤0.01% |
97,100
-28,200
| -23% | -$54.8K |
|
|
HIMX
4666
PUT
Himax Technologies
HIMX
$2.03B
| $204K | ﹤0.01% |
33,700
-1,700
| -5% | -$9.81K |
|
4667
PUT
RPC Inc
RES
$1.13B
| $204K | ﹤0.01% |
28,100
+6,900
| +33% | +$54K |
|
4668
CALL
American Conservative Values ETF
ACVF
$148M
| $203K | ﹤0.01% |
+8,200
| New | +$280K |
|
4669
Schrodinger
SDGR
$1.13B
| $203K | ﹤0.01% |
+5,676
| New | +$165K |
|
4670
Vontier
VNT
$4.54B
| $203K | ﹤0.01% |
5,883
+3,714
| +171% | +$121K |
|
4671
Woodside Energy
WDS
$44.2B
| $203K | ﹤0.01% |
9,631
+3,480
| +57% | +$74.1K |
|
4672
CALL
Ashland
ASH
$3.34B
| $202K | ﹤0.01% |
+2,400
| New | +$190K |
|
4673
BGC Group
BGC
$5.64B
| $202K | ﹤0.01% |
28,108
+18,376
| +189% | +$114K |
|
4674
CALL
Caledonia Mining Corp
CMCL
$351M
| $202K | ﹤0.01% |
16,600
+16,000
| +2,667% | +$186K |
|
4675
PUT
Crinetics Pharmaceuticals
CRNX
$8.88B
| $202K | ﹤0.01% |
5,700
-112,000
| -95% | -$3.43M |
|
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.