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 | |
|---|---|---|---|---|---|---|
4501
CALL
LiveWire
LVWR
$530M
| $236K | ﹤0.01% |
20,900
-5,600
| -21% | -$54.9K |
|
4502
PUT
Nu Skin
NUS
$257M
| $236K | ﹤0.01% |
12,200
+11,900
| +3,967% | +$220K |
|
|
ITI
4503
CALL
DELISTED
Iteris, Inc.
ITI
| $236K | ﹤0.01% |
45,500
-8,300
| -15% | -$36.6K |
|
4504
CALL
Amerant Bancorp
AMTB
$1.16B
| $235K | ﹤0.01% |
+9,600
| New | +$199K |
|
|
BCYC
4505
CALL
Bicycle Therapeutics
BCYC
$269M
| $235K | ﹤0.01% |
13,000
+8,500
| +189% | +$141K |
|
4506
Banco Santander
SAN
$191B
| $235K | ﹤0.01% |
56,818
-3,434
| -6% | -$13.4K |
|
4507
PUT
United Microelectronic
UMC
$42.9B
| $235K | ﹤0.01% |
27,800
+5,500
| +25% | +$41.9K |
|
4508
CALL
1-800-Flowers.com
FLWS
$252M
| $233K | ﹤0.01% |
21,700
+1,600
| +8% | +$13.7K |
|
4509
PUT
Blue Owl Capital
OBDC
$5.35B
| $233K | ﹤0.01% |
15,800
-6,800
| -30% | -$96.6K |
|
4510
Direxion Daily Semiconductor Bear 3X ETF
SOXS
$2.6B
| $233K | ﹤0.01% |
20
+13
| +186% | +$246K |
|
|
ZEUS
4511
PUT
DELISTED
Olympic Steel
ZEUS
| $233K | ﹤0.01% |
+3,500
| New | +$192K |
|
4512
CALL
BioXcel Therapeutics
BTAI
$24.8M
| $232K | ﹤0.01% |
4,931
+3,375
| +217% | +$188K |
|
4513
Enova International
ENVA
$6.09B
| $232K | ﹤0.01% |
4,199
+4,145
| +7,676% | +$191K |
|
4514
Getty Images
GETY
$159M
| $232K | ﹤0.01% |
+44,370
| New | +$223K |
|
4515
CALL
LoveSac
LOVE
$242M
| $232K | ﹤0.01% |
9,100
+3,000
| +49% | +$60.1K |
|
4516
CALL
MINISO
MNSO
$3.88B
| $232K | ﹤0.01% |
11,400
-7,000
| -38% | -$168K |
|
|
RVPH
4517
DELISTED
REVIVA PHARMA HLDGS INC
RVPH
| $232K | ﹤0.01% |
2,261
+201
| +10% | +$18K |
|
|
SLRN
4518
CALL
DELISTED
ACELYRIN
SLRN
| $232K | ﹤0.01% |
31,200
+22,300
| +251% | +$190K |
|
4519
CALL
Hims & Hers Health
HIMS
$5.79B
| $231K | ﹤0.01% |
26,000
-29,800
| -53% | -$220K |
|
4520
Resideo Technologies
REZI
$5.4B
| $231K | ﹤0.01% |
12,297
+10,436
| +561% | +$171K |
|
4521
Relmada Therapeutics
RLMD
$540M
| $231K | ﹤0.01% |
55,985
+17,664
| +46% | +$52.3K |
|
4522
CALL
Arch Capital
ACGL
$36.5B
| $230K | ﹤0.01% |
3,100
-16,000
| -84% | -$1.31M |
|
4523
PUT
Ispire Technology
ISPR
$86.1M
| $230K | ﹤0.01% |
+19,000
| New | +$195K |
|
|
ORC
4524
CALL
Orchid Island Capital
ORC
$1.31B
| $230K | ﹤0.01% |
27,300
+8,600
| +46% | +$64.1K |
|
4525
Zumiez
ZUMZ
$330M
| $230K | ﹤0.01% |
11,341
+4,063
| +56% | +$72.8K |
|
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.