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 | |
|---|---|---|---|---|---|---|
4201
Veralto
VLTO
$24.3B
| $223K | ﹤0.01% |
2,296
-11,573
| -83% | -$1.16M |
|
4202
CALL
Vanguard Total International Stock ETF
VXUS
$151B
| $223K | ﹤0.01% |
3,600
+2,300
| +177% | +$142K |
|
|
AWTM
4203
PUT
DELISTED
AWTM Ultra-Short Duration Enhanced Income ETF
AWTM
| $223K | ﹤0.01% |
14,600
+3,200
| +28% | +$48.9K |
|
4204
PUT
Aehr Test Systems
AEHR
$2.13B
| $222K | ﹤0.01% |
30,500
-42,300
| -58% | -$468K |
|
4205
PUT
Axalta
AXTA
$7.45B
| $222K | ﹤0.01% |
6,700
+6,600
| +6,600% | +$235K |
|
4206
Knife River
KNF
$4.33B
| $222K | ﹤0.01% |
+2,472
| New | +$241K |
|
|
TPC
4207
CALL
Tutor Perini Cor
TPC
$4.03B
| $222K | ﹤0.01% |
9,600
-48,500
| -83% | -$1.2M |
|
4208
GoPro
GPRO
$120M
| $221K | ﹤0.01% |
334,039
+172,911
| +107% | +$153K |
|
|
IRBT
4209
DELISTED
iRobot
IRBT
| $221K | ﹤0.01% |
82,058
+55,824
| +213% | +$403K |
|
4210
Invesco
IVZ
$12.4B
| $221K | ﹤0.01% |
14,590
-111,144
| -88% | -$1.9M |
|
4211
Alliant Energy
LNT
$18.6B
| $221K | ﹤0.01% |
3,439
+1,040
| +43% | +$63.6K |
|
4212
CALL
Nordson
NDSN
$16.4B
| $221K | ﹤0.01% |
1,100
+500
| +83% | +$106K |
|
4213
PUT
Vanguard ESG US Corporate Bond ETF
VCEB
$1.18B
| $221K | ﹤0.01% |
2,800
-9,100
| -76% | -$568K |
|
4214
PUT
Asbury Automotive
ABG
$4.62B
| $220K | ﹤0.01% |
1,000
+500
| +100% | +$130K |
|
4215
CALL
Ameren
AEE
$30.4B
| $220K | ﹤0.01% |
2,200
+1,000
| +83% | +$96.3K |
|
4216
Alexandria Real Estate Equities
ARE
$9.37B
| $220K | ﹤0.01% |
2,381
-44,750
| -95% | -$4.38M |
|
|
ILPT
4217
CALL
Industrial Logistics Properties Trust
ILPT
$582M
| $220K | ﹤0.01% |
64,100
+63,800
| +21,267% | +$238K |
|
4218
CALL
Agilon Health
AGL
$1.55B
| $219K | ﹤0.01% |
2,028
-4,236
| -68% | -$369K |
|
4219
CALL
B&G Foods
BGS
$303M
| $219K | ﹤0.01% |
32,000
-2,800
| -8% | -$18.7K |
|
4220
GigaCloud Technology
GCT
$1.55B
| $219K | ﹤0.01% |
15,492
-20,289
| -57% | -$370K |
|
|
PMT
4221
PUT
PennyMac Mortgage Investment
PMT
$845M
| $219K | ﹤0.01% |
15,000
-81,600
| -84% | -$1.12M |
|
|
UCTT
4222
Ultra Clean Holdings
UCTT
$3.12B
| $219K | ﹤0.01% |
+10,261
| New | +$328K |
|
|
AL
4223
DELISTED
Air Lease Corp
AL
| $218K | ﹤0.01% |
4,520
+4,335
| +2,343% | +$203K |
|
4224
CALL
Compañía de Minas Buenaventura
BVN
$7.68B
| $218K | ﹤0.01% |
14,000
+13,200
| +1,650% | +$177K |
|
4225
Camtek
CAMT
$5.92B
| $218K | ﹤0.01% |
3,723
-5,165
| -58% | -$416K |
|
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.