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 | |
|---|---|---|---|---|---|---|
5851
CALL
NETGEAR
NTGR
$648M
| $46K | ﹤0.01% |
1,900
-7,300
| -79% | -$192K |
|
5852
PUT
OR Royalties Inc
OR
$5.57B
| $46K | ﹤0.01% |
2,200
-800
| -27% | -$15.4K |
|
|
RWT
5853
PUT
Redwood Trust
RWT
$575M
| $46K | ﹤0.01% |
7,700
| – | – |
|
5854
CALL
Rayonier Advanced Materials
RYAM
$605M
| $46K | ﹤0.01% |
8,000
+6,000
| +300% | +$42.1K |
|
|
SEM
5855
CALL
DELISTED
Select Medical
SEM
| $46K | ﹤0.01% |
+2,800
| New | +$51.5K |
|
5856
PUT
E.W. Scripps
SSP
$257M
| $46K | ﹤0.01% |
15,700
+14,600
| +1,327% | +$31.9K |
|
|
UMH
5857
PUT
UMH Properties
UMH
$1.28B
| $46K | ﹤0.01% |
2,500
+1,000
| +67% | +$18.2K |
|
5858
PUT
Arq
ARQ
$85M
| $46K | ﹤0.01% |
11,100
+5,600
| +102% | +$31.8K |
|
5859
Aspen Aerogels
ASPN
$385M
| $45K | ﹤0.01% |
7,080
+3,414
| +93% | +$32.9K |
|
5860
Armstrong World Industries
AWI
$7.37B
| $45K | ﹤0.01% |
325
-1,026
| -76% | -$151K |
|
5861
Vanguard Total International Bond ETF
BNDX
$81.9B
| $45K | ﹤0.01% |
938
+50
| +6% | +$2.44K |
|
|
BRDG
5862
CALL
DELISTED
Bridge Investment Group
BRDG
| $45K | ﹤0.01% |
4,700
-8,900
| -65% | -$77.7K |
|
5863
PUT
Coastal Financial
CCB
$620M
| $45K | ﹤0.01% |
500
| – | – |
|
5864
Delcath Systems
DCTH
$420M
| $45K | ﹤0.01% |
3,547
-5,954
| -63% | -$84.5K |
|
|
EHAB
5865
DELISTED
Enhabit
EHAB
| $45K | ﹤0.01% |
5,172
+2,086
| +68% | +$17.5K |
|
|
EWCZ
5866
CALL
DELISTED
European Wax Center
EWCZ
| $45K | ﹤0.01% |
11,500
-78,600
| -87% | -$468K |
|
5867
Expensify
EXFY
$174M
| $45K | ﹤0.01% |
15,121
-5,992
| -28% | -$20.8K |
|
5868
Factset
FDS
$9.37B
| $45K | ﹤0.01% |
+99
| New | +$45.1K |
|
5869
Federated Hermes
FHI
$4.57B
| $45K | ﹤0.01% |
+1,118
| New | +$43.6K |
|
5870
CALL
Monte Rosa Therapeutics
GLUE
$1.39B
| $45K | ﹤0.01% |
9,900
-22,900
| -70% | -$140K |
|
|
KNDI
5871
PUT
Kandi Technologies Group
KNDI
$65.9M
| $45K | ﹤0.01% |
+32,100
| New | +$41.4K |
|
5872
CALL
Loews
L
$23.9B
| $45K | ﹤0.01% |
500
-1,600
| -76% | -$137K |
|
5873
PUT
Methanex
MEOH
$4.32B
| $45K | ﹤0.01% |
1,300
-1,500
| -54% | -$67.4K |
|
5874
CALL
Mohawk Industries
MHK
$7.51B
| $45K | ﹤0.01% |
400
-4,800
| -92% | -$572K |
|
5875
Precigen
PGEN
$2.22B
| $45K | ﹤0.01% |
30,418
-5,915
| -16% | -$9.31K |
|
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.