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 |
Amazon
AMZN
|
+$168M |
| 2 |
NVIDIA
NVDA
|
+$141M |
| 3 |
TSMC
TSM
|
+$121M |
| 4 |
Meta Platforms (Facebook)
META
|
+$107M |
| 5 |
SPDR Gold Trust
GLD
|
+$103M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Apple
AAPL
|
+$174M |
| 2 |
Western Digital
WDC
|
+$87.7M |
| 3 |
Broadcom
AVGO
|
+$62.2M |
| 4 |
Direxion Daily Semiconductor Bull 3X ETF
SOXL
|
+$52M |
| 5 |
Netflix
NFLX
|
+$44.6M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.62% |
| 2 | Communication Services | 0.22% |
| 3 | Consumer Discretionary | 0.21% |
| 4 | Healthcare | 0.2% |
| 5 | Industrials | 0.1% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
276
PUT
Booking.com
BKNG
$134B
| $38.7M | 0.03% |
230,000
-452,500
| -66% | -$83.3M |
|
277
CALL
Pan American Silver
PAAS
$18.6B
| $38.4M | 0.03% |
702,100
-340,800
| -33% | -$19.6M |
|
278
iShares Semiconductor ETF
SOXX
$46.2B
| $38.2M | 0.03% |
116,273
-39,820
| -26% | -$13.6M |
|
279
CALL
Morgan Stanley
MS
$338B
| $38M | 0.03% |
231,200
-222,800
| -49% | -$38.6M |
|
280
PUT
American Express
AXP
$233B
| $37.9M | 0.03% |
125,200
-40,100
| -24% | -$13.4M |
|
281
PUT
GE Aerospace
GE
$362B
| $37.5M | 0.03% |
132,200
-57,400
| -30% | -$18M |
|
|
B
282
CALL
Barrick Mining
B
$62.2B
| $37.4M | 0.03% |
916,200
-1,257,700
| -58% | -$58.1M |
|
283
CALL
ARK Space & Defense Innovation ETF
ARKX
$818M
| $37.3M | 0.03% |
793,900
-423,700
| -35% | -$13.6M |
|
284
Lumentum
LITE
$64.8B
| $37.1M | 0.02% |
52,807
+35,085
| +198% | +$19.3M |
|
285
CALL
Delta Air Lines
DAL
$53.9B
| $36.9M | 0.02% |
555,500
-151,500
| -21% | -$10.2M |
|
286
CALL
Rivian
RIVN
$23.8B
| $36.8M | 0.02% |
2,442,800
-1,019,800
| -29% | -$16.3M |
|
287
CALL
Rocket Companies
RKT
$36.2B
| $36.3M | 0.02% |
2,550,000
-152,300
| -6% | -$2.77M |
|
288
CALL
Carnival Corporation Ltd
CCL
$34.6B
| $36.3M | 0.02% |
1,401,800
-1,095,800
| -44% | -$32M |
|
289
VanEck Semiconductor ETF
SMH
$69.8B
| $35.9M | 0.02% |
93,701
+16,075
| +21% | +$6.38M |
|
290
PUT
Reddit
RDDT
$32.5B
| $35.9M | 0.02% |
266,400
-22,100
| -8% | -$3.76M |
|
|
291
PUT
Rivian
RIVN
$23.8B
| $35.8M | 0.02% |
2,378,600
-1,866,300
| -44% | -$29.8M |
|
292
Pfizer
PFE
$142B
| $35.6M | 0.02% |
1,266,685
-224,352
| -15% | -$5.97M |
|
293
PUT
Marathon Digital Holdings
MARA
$4.87B
| $35.5M | 0.02% |
4,349,400
-1,547,500
| -26% | -$14M |
|
294
PUT
Target
TGT
$61.1B
| $34.8M | 0.02% |
287,000
-282,100
| -50% | -$31.8M |
|
295
PUT
Spotify
SPOT
$96.5B
| $34.8M | 0.02% |
71,700
-27,700
| -28% | -$13.9M |
|
296
CALL
Baidu
BIDU
$36.5B
| $34.5M | 0.02% |
310,000
-392,900
| -56% | -$53.3M |
|
297
CALL
Nu Holdings
NU
$68.5B
| $34.5M | 0.02% |
2,400,800
+282,900
| +13% | +$4.59M |
|
298
CALL
Airbnb
ABNB
$81.6B
| $34.5M | 0.02% |
273,100
-305,400
| -53% | -$39.7M |
|
299
CALL
Vertiv
VRT
$117B
| $34.2M | 0.02% |
136,600
-417,200
| -75% | -$92.6M |
|
300
CALL
Moderna
MRNA
$22.6B
| $34M | 0.02% |
670,000
-1,064,500
| -61% | -$49.7M |
|
Similar funds
Simplex Trading's Q1 2026 Portfolio in Review
As of Q1 2026, Simplex Trading held 10,500 positions worth $149B, down 16% from $177B the previous quarter. Its ten largest holdings account for 51% of the portfolio.
Simplex Trading withdrew a net $18.1B in Q1 2026, closing 1,574 positions and reducing 3,926 holdings. Its most notable exit was Direxion Daily Semiconductor Bull 3X ETF, an estimated $52M position sold in full.
By sector, the portfolio is most concentrated in Technology at 0.62% of assets, up from 0.59% a quarter earlier, followed by Communication Services and Consumer Discretionary.
Against the trend, Simplex Trading opened a new position in Amazon worth $159M.
- Simplex Trading's largest Q1 2026 buy was Amazon: 764,884 shares worth $159M.
- Simplex Trading added most to NVIDIA in Q1 2026, an estimated $141M increase.
- Simplex Trading's biggest Q1 2026 reduction was Apple, cutting an estimated $174M.
- Simplex Trading fully exited Direxion Daily Semiconductor Bull 3X ETF in Q1 2026, selling an estimated $52M.
- Simplex Trading's ten largest holdings make up 51% of its $149B portfolio in Q1 2026.
- Simplex Trading opened 2,156 new positions and closed 1,574 in Q1 2026.
- Simplex Trading's portfolio value fell 16% quarter-over-quarter to $149B.
Based on Simplex Trading's 13F filing for Q1 2026, filed 14 May 2026.