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 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$272M |
| 2 |
Alphabet (Google) Class A
GOOGL
|
+$99M |
| 3 |
NVIDIA
NVDA
|
+$89.9M |
| 4 |
TSMC
TSM
|
+$87.7M |
| 5 |
Amazon
AMZN
|
+$61M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Apple
AAPL
|
+$518M |
| 2 |
Strategy Inc
MSTR
|
+$81.2M |
| 3 |
Alibaba
BABA
|
+$66.7M |
| 4 |
Advanced Micro Devices
AMD
|
+$44.3M |
| 5 |
Uber
UBER
|
+$41.3M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.41% |
| 2 | Consumer Discretionary | 0.22% |
| 3 | Healthcare | 0.17% |
| 4 | Communication Services | 0.15% |
| 5 | Financials | 0.13% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
6901
Defiance R2000 Weekly Distribution ETF
IWMY
$96.9M
| $13K | ﹤0.01% |
540
-4,489
| -89% | -$129K |
|
6902
Laser Photonics
LASE
$52.2M
| $13K | ﹤0.01% |
4,405
+2,732
| +163% | +$11.5K |
|
6903
CALL
LifeVantage
LFVN
$81.1M
| $13K | ﹤0.01% |
+900
| New | +$17K |
|
|
FNUC
6904
PUT
Frontier Nuclear and Minerals Inc
FNUC
$43.2M
| $13K | ﹤0.01% |
1,669
+869
| +109% | +$7.62K |
|
6905
LanzaTech
LNZA
$60.4M
| $13K | ﹤0.01% |
552
+407
| +281% | +$36.6K |
|
|
LSEA
6906
DELISTED
Landsea Homes
LSEA
| $13K | ﹤0.01% |
2,097
-17,448
| -89% | -$135K |
|
6907
CALL
MacroGenics
MGNX
$245M
| $13K | ﹤0.01% |
10,400
-10,000
| -49% | -$26.1K |
|
6908
M/I Homes
MHO
$3.89B
| $13K | ﹤0.01% |
+114
| New | +$14K |
|
6909
CALL
Mitek Systems
MITK
$758M
| $13K | ﹤0.01% |
1,600
-47,800
| -97% | -$465K |
|
6910
CALL
Navient
NAVI
$822M
| $13K | ﹤0.01% |
1,100
-4,400
| -80% | -$60.1K |
|
6911
PUT
NewtekOne
NEWT
$425M
| $13K | ﹤0.01% |
1,100
-300
| -21% | -$3.79K |
|
6912
CALL
Nkarta
NKTX
$159M
| $13K | ﹤0.01% |
7,300
+5,400
| +284% | +$11.1K |
|
|
NMG
6913
PUT
Nouveau Monde Graphite
NMG
$441M
| $13K | ﹤0.01% |
+9,000
| New | +$16.6K |
|
6914
PUT
Nomad Foods
NOMD
$1.7B
| $13K | ﹤0.01% |
+700
| New | +$12.8K |
|
6915
PUT
Oceaneering
OII
$4.78B
| $13K | ﹤0.01% |
600
+200
| +50% | +$4.75K |
|
6916
PennantPark Floating Rate Capital
PFLT
$705M
| $13K | ﹤0.01% |
+1,233
| New | +$13.8K |
|
6917
VanEck Preferred Securities ex Financials ETF
PFXF
$2.4B
| $13K | ﹤0.01% |
810
-611
| -43% | -$10.5K |
|
|
PINE
6918
CALL
Alpine Income Property Trust
PINE
$337M
| $13K | ﹤0.01% |
800
+500
| +167% | +$8.27K |
|
6919
PUT
Palomar
PLMR
$3.79B
| $13K | ﹤0.01% |
+100
| New | +$11.8K |
|
|
PPIH
6920
Perma-Pipe International
PPIH
$206M
| $13K | ﹤0.01% |
1,111
+714
| +180% | +$10.2K |
|
6921
Purple Innovation
PRPL
$35.7M
| $13K | ﹤0.01% |
733
+651
| +794% | +$15K |
|
6922
CALL
ProQR Therapeutics
PRQR
$248M
| $13K | ﹤0.01% |
10,500
-400
| -4% | -$851 |
|
6923
CALL
Ribbon Communications
RBBN
$361M
| $13K | ﹤0.01% |
3,500
+300
| +9% | +$1.26K |
|
6924
CALL
Resources Connection
RGP
$136M
| $13K | ﹤0.01% |
2,100
+1,600
| +320% | +$12.4K |
|
6925
CALL
RXO
RXO
$3.73B
| $13K | ﹤0.01% |
700
-100
| -13% | -$2.19K |
|
Similar funds
Simplex Trading's Q1 2025 Portfolio in Review
As of Q1 2025, Simplex Trading held 10,070 positions worth $156B, down 13% from $179B the previous quarter. Its ten largest holdings account for 51% of the portfolio.
Simplex Trading withdrew a net $7.93B in Q1 2025, closing 1,547 positions and reducing 3,654 holdings. Its most notable exit was Alibaba, an estimated $66.7M position sold in full.
By sector, the portfolio is most concentrated in Technology at 0.41% of assets, down from 0.68% a quarter earlier, followed by Consumer Discretionary and Healthcare.
Against the trend, Simplex Trading opened a new position in iShares 20+ Year Treasury Bond ETF worth $278M.
- Simplex Trading's largest Q1 2025 buy was iShares 20+ Year Treasury Bond ETF: 3,057,978 shares worth $278M.
- Simplex Trading added most to NVIDIA in Q1 2025, an estimated $89.9M increase.
- Simplex Trading's biggest Q1 2025 reduction was Apple, cutting an estimated $518M.
- Simplex Trading fully exited Alibaba in Q1 2025, selling an estimated $66.7M.
- Simplex Trading's ten largest holdings make up 51% of its $156B portfolio in Q1 2025.
- Simplex Trading opened 1,566 new positions and closed 1,547 in Q1 2025.
- Simplex Trading's portfolio value fell 13% quarter-over-quarter to $156B.
Based on Simplex Trading's 13F filing for Q1 2025, filed 12 May 2025.