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 | |
|---|---|---|---|---|---|---|
4701
CALL
Yelp
YELP
$1.44B
| $140K | ﹤0.01% |
3,800
-26,600
| -88% | -$1M |
|
4702
Brookdale Senior Living
BKD
$3.49B
| $139K | ﹤0.01% |
+22,364
| New | +$120K |
|
4703
Cullen/Frost Bankers
CFR
$10.3B
| $139K | ﹤0.01% |
+1,112
| New | +$149K |
|
|
CMPS
4704
Compass Pathways
CMPS
$1.56B
| $139K | ﹤0.01% |
+48,651
| New | +$187K |
|
4705
Evolus
EOLS
$396M
| $139K | ﹤0.01% |
11,598
+9,920
| +591% | +$130K |
|
4706
CALL
GoodRx Holdings
GDRX
$1.07B
| $139K | ﹤0.01% |
31,600
+5,300
| +20% | +$24.9K |
|
4707
CALL
Mirum Pharmaceuticals
MIRM
$6.87B
| $139K | ﹤0.01% |
3,100
-9,000
| -74% | -$424K |
|
|
PBPB
4708
CALL
DELISTED
Potbelly
PBPB
| $139K | ﹤0.01% |
+14,700
| New | +$162K |
|
|
BTCL
4709
T-Rex 2X Long Bitcoin Daily Target ETF
BTCL
$23.1M
| $139K | ﹤0.01% |
4,100
+3,596
| +713% | +$168K |
|
4710
CorMedix
CRMD
$588M
| $138K | ﹤0.01% |
22,416
-187,940
| -89% | -$1.95M |
|
4711
Energy Recovery
ERII
$435M
| $138K | ﹤0.01% |
+8,701
| New | +$132K |
|
|
GRFS
4712
Grifois
GRFS
$5.58B
| $138K | ﹤0.01% |
19,427
-946
| -5% | -$7.14K |
|
4713
CALL
Lufax Holding
LU
$1.38B
| $138K | ﹤0.01% |
46,500
-30,800
| -40% | -$85.4K |
|
4714
MKS Inc
MKSI
$19.8B
| $138K | ﹤0.01% |
+1,731
| New | +$175K |
|
4715
ProShares UltraShort S&P500
SDS
$420M
| $138K | ﹤0.01% |
1,292
-4,176
| -76% | -$412K |
|
4716
VF Corp
VFC
$5.87B
| $138K | ﹤0.01% |
8,902
-449,041
| -98% | -$9.95M |
|
4717
Cincinnati Financial
CINF
$26.8B
| $137K | ﹤0.01% |
+929
| New | +$131K |
|
4718
CALL
Americold
COLD
$4.13B
| $137K | ﹤0.01% |
6,400
+5,300
| +482% | +$115K |
|
4719
PUT
Dream Finders Homes
DFH
$1.22B
| $137K | ﹤0.01% |
6,100
+6,000
| +6,000% | +$140K |
|
4720
CALL
Amdocs
DOX
$5.87B
| $137K | ﹤0.01% |
1,500
+1,000
| +200% | +$87.3K |
|
4721
CALL
Evolv Technologies
EVLV
$986M
| $137K | ﹤0.01% |
44,100
-494,900
| -92% | -$1.74M |
|
4722
CALL
Extreme Networks
EXTR
$3.9B
| $137K | ﹤0.01% |
10,400
+3,200
| +44% | +$50.1K |
|
4723
CALL
Installed Building Products
IBP
$6.07B
| $137K | ﹤0.01% |
800
| – | – |
|
4724
PUT
M/I Homes
MHO
$3.87B
| $137K | ﹤0.01% |
1,200
+600
| +100% | +$73.6K |
|
|
ODP
4725
CALL
DELISTED
ODP
ODP
| $137K | ﹤0.01% |
9,600
-2,700
| -22% | -$51.8K |
|
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.