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 | |
|---|---|---|---|---|---|---|
|
SUP
5926
DELISTED
Superior Industries International
SUP
| $43K | ﹤0.01% |
20,507
+14,177
| +224% | +$29.1K |
|
5927
CALL
Timken Company
TKR
$9.52B
| $43K | ﹤0.01% |
600
+400
| +200% | +$30.9K |
|
5928
Titan International
TWI
$466M
| $43K | ﹤0.01% |
5,203
-3,318
| -39% | -$27.4K |
|
5929
PUT
VirTra
VTSI
$35.1M
| $43K | ﹤0.01% |
10,800
+7,500
| +227% | +$44.8K |
|
5930
ProShares UltraShort Bitcoin ETF
SBIT
$171M
| $43K | ﹤0.01% |
662
-139
| -17% | -$7.82K |
|
5931
PUT
Armstrong World Industries
AWI
$7.36B
| $42K | ﹤0.01% |
300
+200
| +200% | +$29.5K |
|
5932
CALL
Buckle
BKE
$2.23B
| $42K | ﹤0.01% |
1,100
-1,700
| -61% | -$73.6K |
|
5933
CALL
Backblaze
BLZE
$842M
| $42K | ﹤0.01% |
8,700
-3,600
| -29% | -$22.2K |
|
|
CLPR
5934
Clipper Realty
CLPR
$45.1M
| $42K | ﹤0.01% |
11,100
+6,951
| +168% | +$29.2K |
|
|
CVAC
5935
PUT
DELISTED
CureVac
CVAC
| $42K | ﹤0.01% |
15,300
+10,200
| +200% | +$35.5K |
|
|
KYNB
5936
CALL
Kyntra Bio
KYNB
$27.6M
| $42K | ﹤0.01% |
5,532
-1,020
| -16% | -$12.2K |
|
5937
PUT
GoodRx Holdings
GDRX
$1.07B
| $42K | ﹤0.01% |
9,600
-7,100
| -43% | -$33.3K |
|
|
XRN
5938
PUT
Chiron Real Estate Inc
XRN
$512M
| $42K | ﹤0.01% |
960
+180
| +23% | +$7.44K |
|
5939
PUT
Liberty Broadband Class C
LBRDK
$4.79B
| $42K | ﹤0.01% |
+500
| New | +$40.2K |
|
|
NOAH
5940
Noah Holdings
NOAH
$584M
| $42K | ﹤0.01% |
+4,448
| New | +$48.7K |
|
5941
Grupo Aeroportuario Centro Norte
OMAB
$5.16B
| $42K | ﹤0.01% |
538
+453
| +533% | +$35.1K |
|
5942
PUT
POSCO
PKX
$16.1B
| $42K | ﹤0.01% |
900
+300
| +50% | +$14K |
|
5943
STAAR Surgical
STAA
$1.19B
| $42K | ﹤0.01% |
2,391
+1,701
| +247% | +$34.1K |
|
5944
PUT
Gentherm
THRM
$1.27B
| $42K | ﹤0.01% |
+1,600
| New | +$56K |
|
|
TMHC
5945
PUT
DELISTED
Taylor Morrison
TMHC
| $42K | ﹤0.01% |
700
+600
| +600% | +$37.4K |
|
5946
CALL
ReposiTrak
TRAK
$157M
| $42K | ﹤0.01% |
+2,100
| New | +$43.4K |
|
5947
TTEC Holdings
TTEC
$123M
| $42K | ﹤0.01% |
12,968
-3,435
| -21% | -$12.7K |
|
5948
CALL
ReWalk Robotics
LFWD
$19.7M
| $42K | ﹤0.01% |
2,100
+492
| +31% | +$10.2K |
|
5949
United Parks & Resorts
PRKS
$2.14B
| $42K | ﹤0.01% |
936
+922
| +6,586% | +$47.6K |
|
5950
PUT
Annovis Bio
ANVS
$74M
| $41K | ﹤0.01% |
27,900
-19,600
| -41% | -$60K |
|
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.