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 | |
|---|---|---|---|---|---|---|
4476
PUT
STAAR Surgical
STAA
$1.19B
| $176K | ﹤0.01% |
10,000
+7,300
| +270% | +$146K |
|
4477
CALL
Tronox
TROX
$967M
| $176K | ﹤0.01% |
25,000
+13,200
| +112% | +$114K |
|
|
CMPS
4478
CALL
Compass Pathways
CMPS
$1.47B
| $175K | ﹤0.01% |
61,400
+56,400
| +1,128% | +$217K |
|
|
MFA
4479
CALL
MFA Financial
MFA
$932M
| $175K | ﹤0.01% |
17,100
+2,000
| +13% | +$20.9K |
|
4480
PUT
Marten Transport
MRTN
$1.22B
| $175K | ﹤0.01% |
12,800
-52,900
| -81% | -$787K |
|
4481
PUT
American Coastal Insurance
ACIC
$536M
| $174K | ﹤0.01% |
15,100
-12,700
| -46% | -$155K |
|
4482
Imperial Oil
IMO
$62.3B
| $174K | ﹤0.01% |
2,407
+1,865
| +344% | +$128K |
|
4483
PUT
LivePerson
LPSN
$22M
| $174K | ﹤0.01% |
14,553
+3,246
| +29% | +$57.7K |
|
4484
CALL
NGL Energy Partners
NGL
$1.94B
| $174K | ﹤0.01% |
38,400
+25,100
| +189% | +$125K |
|
|
PLCY
4485
PUT
DELISTED
EventShares U.S. Legislative Opportunities ETF
PLCY
| $174K | ﹤0.01% |
9,500
-6,500
| -41% | -$119K |
|
4486
CALL
AMC Global Media
AMCX
$450M
| $173K | ﹤0.01% |
25,200
+19,400
| +334% | +$162K |
|
4487
ANI Pharmaceuticals
ANIP
$1.86B
| $173K | ﹤0.01% |
+2,589
| New | +$155K |
|
4488
PUT
H.B. Fuller
FUL
$3B
| $173K | ﹤0.01% |
+3,100
| New | +$183K |
|
4489
HEICO Corp Class A
HEI.A
$36B
| $173K | ﹤0.01% |
824
-353
| -30% | -$68.4K |
|
|
LAND
4490
Gladstone Land Corp
LAND
$365M
| $173K | ﹤0.01% |
16,472
-944
| -5% | -$10.3K |
|
4491
Roper Technologies
ROP
$40.4B
| $173K | ﹤0.01% |
+295
| New | +$166K |
|
4492
PUT
Revolution Medicines
RVMD
$38.5B
| $173K | ﹤0.01% |
4,900
-5,100
| -51% | -$207K |
|
4493
CALL
Palladyne AI
PDYN
$228M
| $173K | ﹤0.01% |
+29,500
| New | +$240K |
|
4494
CALL
Ibotta
IBTA
$618M
| $173K | ﹤0.01% |
4,100
+4,000
| +4,000% | +$234K |
|
|
SARO
4495
CALL
StandardAero Inc
SARO
$9.55B
| $173K | ﹤0.01% |
6,500
+5,500
| +550% | +$147K |
|
|
TPC
4496
Tutor Perini Cor
TPC
$4.03B
| $173K | ﹤0.01% |
+7,493
| New | +$185K |
|
4497
Fortive
FTV
$18B
| $172K | ﹤0.01% |
+3,122
| New | +$183K |
|
4498
ManpowerGroup
MAN
$2.6B
| $172K | ﹤0.01% |
+2,983
| New | +$173K |
|
|
MTLS
4499
CALL
Materialise
MTLS
$366M
| $172K | ﹤0.01% |
35,100
+32,100
| +1,070% | +$221K |
|
|
NAK
4500
PUT
Northern Dynasty Minerals
NAK
$773M
| $172K | ﹤0.01% |
150,100
+95,000
| +172% | +$69.1K |
|
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.