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 | |
|---|---|---|---|---|---|---|
4451
PUT
SLM Corp
SLM
$4.83B
| $246K | ﹤0.01% |
12,900
+7,300
| +130% | +$110K |
|
4452
PUT
Sterling Infrastructure
STRL
$15.2B
| $246K | ﹤0.01% |
2,800
+1,500
| +115% | +$108K |
|
4453
Teucrium Corn Fund
CORN
$178M
| $245K | ﹤0.01% |
11,376
-8,146
| -42% | -$181K |
|
4454
CALL
iShares Core Dividend ETF
DIVB
$1.71B
| $245K | ﹤0.01% |
6,700
+1,800
| +37% | +$68.6K |
|
|
NOAH
4455
PUT
Noah Holdings
NOAH
$590M
| $245K | ﹤0.01% |
+17,800
| New | +$225K |
|
4456
RxSight
RXST
$254M
| $245K | ﹤0.01% |
+6,085
| New | +$178K |
|
4457
CALL
Tradeweb Markets
TW
$23B
| $245K | ﹤0.01% |
2,700
-11,700
| -81% | -$1.04M |
|
|
GTHX
4458
CALL
DELISTED
G1 Therapeutics, Inc. Common Stock
GTHX
| $245K | ﹤0.01% |
80,500
+41,000
| +104% | +$77K |
|
4459
PUT
Aemetis
AMTX
$99.2M
| $244K | ﹤0.01% |
46,700
-23,300
| -33% | -$110K |
|
4460
PUT
Granite Construction
GVA
$5.16B
| $244K | ﹤0.01% |
+4,800
| New | +$209K |
|
4461
CALL
OR Royalties Inc
OR
$5.53B
| $244K | ﹤0.01% |
17,100
-72,800
| -81% | -$954K |
|
4462
CALL
Talkspace
TALK
$874M
| $244K | ﹤0.01% |
96,400
+66,400
| +221% | +$134K |
|
4463
Teleflex
TFX
$5.96B
| $244K | ﹤0.01% |
+982
| New | +$210K |
|
|
LUCK
4464
PUT
Lucky Strike Entertainment
LUCK
$959M
| $244K | ﹤0.01% |
17,300
-21,400
| -55% | -$235K |
|
4465
Ametek
AME
$53.9B
| $243K | ﹤0.01% |
+1,474
| New | +$225K |
|
4466
Coherus Oncology
CHRS
$217M
| $243K | ﹤0.01% |
73,038
+24,145
| +49% | +$64.7K |
|
4467
PUT
Invesco CurrencyShares Swiss Franc Trust
FXF
$411M
| $243K | ﹤0.01% |
+2,300
| New | +$231K |
|
4468
CALL
Kontoor Brands
KTB
$4.71B
| $243K | ﹤0.01% |
3,900
+700
| +22% | +$36K |
|
|
RPC
4469
PUT
Ridgepost Capital
RPC
$926M
| $243K | ﹤0.01% |
+23,800
| New | +$235K |
|
4470
Revolution Medicines
RVMD
$38.5B
| $243K | ﹤0.01% |
+8,502
| New | +$204K |
|
4471
Xylem
XYL
$28.5B
| $243K | ﹤0.01% |
+2,129
| New | +$212K |
|
4472
Ericsson
ERIC
$32.1B
| $242K | ﹤0.01% |
38,523
+9,920
| +35% | +$50.3K |
|
4473
HNI Corp
HNI
$3.08B
| $242K | ﹤0.01% |
+5,792
| New | +$221K |
|
4474
Zebra Technologies
ZBRA
$13.5B
| $242K | ﹤0.01% |
+886
| New | +$202K |
|
4475
CALL
Amphastar Pharmaceuticals
AMPH
$907M
| $241K | ﹤0.01% |
3,900
+2,800
| +255% | +$147K |
|
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.