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 | |
|---|---|---|---|---|---|---|
|
DCPH
4626
DELISTED
Deciphera Pharmaceuticals, Inc. Common Stock
DCPH
| $213K | ﹤0.01% |
13,266
+12,158
| +1,097% | +$155K |
|
|
EHAB
4627
CALL
DELISTED
Enhabit
EHAB
| $212K | ﹤0.01% |
20,500
-9,000
| -31% | -$85.1K |
|
|
HUYA
4628
Huya Inc
HUYA
$558M
| $212K | ﹤0.01% |
58,110
-85,166
| -59% | -$285K |
|
4629
La-Z-Boy
LZB
$1.64B
| $212K | ﹤0.01% |
+5,754
| New | +$185K |
|
4630
Murphy USA
MUSA
$11.4B
| $212K | ﹤0.01% |
596
-363
| -38% | -$132K |
|
4631
PUT
Oscar Health
OSCR
$9.22B
| $212K | ﹤0.01% |
23,200
+4,100
| +21% | +$28.3K |
|
|
PBPB
4632
CALL
DELISTED
Potbelly
PBPB
| $212K | ﹤0.01% |
20,400
+20,000
| +5,000% | +$182K |
|
4633
Applied Digital
APLD
$6.68B
| $211K | ﹤0.01% |
31,422
-180,018
| -85% | -$968K |
|
|
PCH
4634
CALL
DELISTED
PotlatchDeltic
PCH
| $211K | ﹤0.01% |
4,300
+2,400
| +126% | +$110K |
|
4635
PUT
Saic
SAIC
$4.95B
| $211K | ﹤0.01% |
1,700
-100
| -6% | -$11.6K |
|
4636
J.M. Smucker
SJM
$13.5B
| $211K | ﹤0.01% |
1,674
-1,863
| -53% | -$216K |
|
4637
CALL
TFS Financial
TFSL
$5.11B
| $211K | ﹤0.01% |
14,400
+14,100
| +4,700% | +$182K |
|
|
SILV
4638
PUT
DELISTED
SilverCrest Metals Inc. Common Shares
SILV
| $211K | ﹤0.01% |
32,300
-6,500
| -17% | -$36.2K |
|
4639
CALL
United States Copper Index Fund
CPER
$742M
| $210K | ﹤0.01% |
8,700
-11,600
| -57% | -$268K |
|
4640
PUT
MarineMax
HZO
$748M
| $210K | ﹤0.01% |
5,400
-2,700
| -33% | -$85.5K |
|
4641
CALL
Intrepid Potash
IPI
$476M
| $210K | ﹤0.01% |
8,800
+2,400
| +38% | +$50.7K |
|
4642
iShares S&P 100 ETF
OEF
$19.5B
| $210K | ﹤0.01% |
942
+760
| +418% | +$160K |
|
|
JOYY
4643
CALL
JOYY Inc
JOYY
$3.73B
| $210K | ﹤0.01% |
5,300
-11,500
| -68% | -$457K |
|
|
AY
4644
CALL
DELISTED
Atlantica Sustainable Infrastructure plc Ordinary Shares
AY
| $210K | ﹤0.01% |
9,800
-300
| -3% | -$5.7K |
|
4645
Autoliv
ALV
$9.14B
| $209K | ﹤0.01% |
1,904
+180
| +10% | +$17.9K |
|
4646
CALL
America Movil
AMX
$74.6B
| $209K | ﹤0.01% |
11,300
-1,000
| -8% | -$17.6K |
|
4647
CALL
Energizer
ENR
$1.47B
| $209K | ﹤0.01% |
6,600
+800
| +14% | +$25.3K |
|
|
INVX
4648
CALL
Innovex International
INVX
$1.8B
| $209K | ﹤0.01% |
9,000
+8,600
| +2,150% | +$202K |
|
4649
American Coastal Insurance
ACIC
$536M
| $208K | ﹤0.01% |
+22,032
| New | +$177K |
|
4650
Capricor Therapeutics
CAPR
$380M
| $208K | ﹤0.01% |
42,740
+5,959
| +16% | +$19.4K |
|
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.