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 | |
|---|---|---|---|---|---|---|
4401
PUT
CVRx
CVRX
$131M
| $257K | ﹤0.01% |
8,200
+6,800
| +486% | +$128K |
|
4402
STAG Industrial
STAG
$7.44B
| $257K | ﹤0.01% |
6,570
+254
| +4% | +$9.02K |
|
|
ZUO
4403
PUT
DELISTED
Zuora, Inc.
ZUO
| $257K | ﹤0.01% |
27,400
+25,400
| +1,270% | +$210K |
|
|
EVBG
4404
CALL
DELISTED
Everbridge, Inc. Common Stock
EVBG
| $257K | ﹤0.01% |
10,600
+3,600
| +51% | +$77.6K |
|
4405
PUT
Corcept Therapeutics
CORT
$9.98B
| $256K | ﹤0.01% |
7,900
+7,300
| +1,217% | +$200K |
|
4406
CALL
A10 Networks
ATEN
$2.07B
| $255K | ﹤0.01% |
19,400
-1,500
| -7% | -$18.2K |
|
4407
PUT
Invesco DB Base Metals Fund
DBB
$306M
| $255K | ﹤0.01% |
16,600
-1,000
| -6% | -$18.4K |
|
4408
CNA Financial
CNA
$14.9B
| $254K | ﹤0.01% |
6,006
-113
| -2% | -$4.6K |
|
4409
Fidus Investment
FDUS
$759M
| $254K | ﹤0.01% |
12,911
+4,174
| +48% | +$79.6K |
|
4410
Outset Medical
OM
$86.4M
| $254K | ﹤0.01% |
+3,141
| New | +$256K |
|
4411
PUT
Redwire
RDW
$1.86B
| $254K | ﹤0.01% |
89,400
-61,200
| -41% | -$167K |
|
|
VRNT
4412
DELISTED
Verint Systems
VRNT
| $254K | ﹤0.01% |
9,428
-40,549
| -81% | -$940K |
|
4413
Antero Midstream
AM
$10.2B
| $253K | ﹤0.01% |
+20,233
| New | +$255K |
|
4414
Xtrackers Harvest CSI 300 China A-Shares ETF
ASHR
$1.53B
| $253K | ﹤0.01% |
10,588
-113,801
| -91% | -$2.81M |
|
4415
PUT
Cheniere Energy
CQP
$30.5B
| $253K | ﹤0.01% |
5,100
+3,500
| +219% | +$195K |
|
4416
Genie Energy
GNE
$370M
| $253K | ﹤0.01% |
+9,010
| New | +$207K |
|
4417
PUT
Ryanair
RYAAY
$30B
| $253K | ﹤0.01% |
4,750
+4,500
| +1,800% | +$198K |
|
4418
VirTra
VTSI
$33.1M
| $253K | ﹤0.01% |
26,767
+25,552
| +2,103% | +$166K |
|
|
NARI
4419
PUT
DELISTED
Inari Medical, Inc. Common Stock
NARI
| $253K | ﹤0.01% |
3,900
+400
| +11% | +$24.1K |
|
4420
Allegiant Air
ALGT
$2.57B
| $252K | ﹤0.01% |
+3,057
| New | +$221K |
|
4421
CALL
Coherus Oncology
CHRS
$217M
| $252K | ﹤0.01% |
75,800
+23,100
| +44% | +$61.9K |
|
|
CIO
4422
CALL
DELISTED
City Office REIT
CIO
| $252K | ﹤0.01% |
41,300
+38,400
| +1,324% | +$179K |
|
4423
PUT
iShares S&P GSCI Commodity-Indexed Trust
GSG
$1B
| $252K | ﹤0.01% |
12,600
+12,500
| +12,500% | +$263K |
|
4424
PUT
Terex
TEX
$7.37B
| $252K | ﹤0.01% |
4,400
-19,100
| -81% | -$987K |
|
4425
CALL
Arhaus
ARHS
$1.07B
| $251K | ﹤0.01% |
21,200
-5,900
| -22% | -$55.6K |
|
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.