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 | |
|---|---|---|---|---|---|---|
276
PUT
SLB Ltd
SLB
$70.8B
| $50.9M | 0.03% |
1,218,400
+119,200
| +11% | +$4.88M |
|
277
PUT
MongoDB
MDB
$24B
| $50.7M | 0.03% |
288,900
-17,000
| -6% | -$4.14M |
|
278
PUT
Sea Limited
SE
$61.5B
| $49.9M | 0.03% |
382,100
-218,500
| -36% | -$27.1M |
|
279
CALL
Delta Air Lines
DAL
$53.5B
| $49.6M | 0.03% |
1,138,400
-620,100
| -35% | -$36.8M |
|
280
PUT
Blackstone
BX
$152B
| $49.3M | 0.03% |
352,500
-122,000
| -26% | -$19.8M |
|
281
PUT
First Solar
FSLR
$22.2B
| $49.2M | 0.03% |
389,500
-156,900
| -29% | -$24.5M |
|
282
CALL
3M
MMM
$87.2B
| $49M | 0.03% |
724,900
-286,600
| -28% | -$42.1M |
|
283
CALL
Spotify
SPOT
$96.9B
| $49M | 0.03% |
105,000
-26,000
| -20% | -$14.5M |
|
284
PUT
KKR & Co
KKR
$86.1B
| $48.3M | 0.03% |
418,000
-63,600
| -13% | -$8.75M |
|
285
CALL
Boston Scientific
BSX
$64.3B
| $48.2M | 0.03% |
478,000
+121,700
| +34% | +$12.3M |
|
286
PUT
Devon Energy
DVN
$52.4B
| $48.1M | 0.03% |
1,285,400
-170,800
| -12% | -$6.06M |
|
287
PUT
Humana
HUM
$46.8B
| $47.7M | 0.03% |
180,300
-47,600
| -21% | -$12.9M |
|
288
CALL
GE Aerospace
GE
$361B
| $47.4M | 0.03% |
247,500
-244,300
| -50% | -$48.1M |
|
289
PUT
Applied Materials
AMAT
$444B
| $47.1M | 0.03% |
324,500
-144,200
| -31% | -$24.2M |
|
290
CALL
Cheniere Energy
LNG
$56.9B
| $47M | 0.03% |
202,900
+85,400
| +73% | +$19.2M |
|
291
CALL
American Airlines Group
AAL
$8.83B
| $46.9M | 0.03% |
4,447,100
+575,700
| +15% | +$8.67M |
|
292
CALL
W.W. Grainger
GWW
$64B
| $46.8M | 0.03% |
47,400
+6,200
| +15% | +$6.41M |
|
293
CALL
American Express
AXP
$233B
| $46.7M | 0.03% |
173,400
-175,100
| -50% | -$51.8M |
|
294
CALL
Chipotle Mexican Grill
CMG
$40.9B
| $46.6M | 0.03% |
927,200
-1,072,500
| -54% | -$58.3M |
|
295
PUT
Intuitive Surgical
ISRG
$119B
| $46.1M | 0.03% |
93,100
-2,200
| -2% | -$1.22M |
|
296
CALL
Constellation Brands
STZ
$22.1B
| $45.7M | 0.03% |
248,900
+180,100
| +262% | +$32.7M |
|
297
PUT
Datadog
DDOG
$87.1B
| $45.7M | 0.03% |
460,300
+99,200
| +27% | +$12.5M |
|
298
CALL
Zscaler
ZS
$22.8B
| $45.3M | 0.03% |
228,100
+35,300
| +18% | +$7.03M |
|
|
299
PUT
Boston Scientific
BSX
$64.3B
| $45.1M | 0.03% |
447,400
-32,200
| -7% | -$3.24M |
|
300
PUT
United Parcel Service
UPS
$97B
| $44.5M | 0.03% |
404,800
-3,900
| -1% | -$466K |
|
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.