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 | |
|---|---|---|---|---|---|---|
4951
CALL
Forum Energy Technologies
FET
$654M
| $111K | ﹤0.01% |
+1,900
| New | +$96.4K |
|
4952
Alpha and Omega Semiconductor
AOSL
$923M
| $111K | ﹤0.01% |
5,020
-4,036
| -45% | -$87.8K |
|
|
UX
4953
Roundhill Uranium ETF
UX
$5.07M
| $111K | ﹤0.01% |
3,637
+3,514
| +2,857% | +$110K |
|
4954
PUT
POSCO
PKX
$15.8B
| $111K | ﹤0.01% |
1,900
+1,400
| +280% | +$84.9K |
|
4955
Sprout Social
SPT
$455M
| $111K | ﹤0.01% |
+19,458
| New | +$150K |
|
4956
CALL
California Resources
CRC
$4.75B
| $111K | ﹤0.01% |
1,600
-8,000
| -83% | -$453K |
|
4957
PUT
MSC Industrial Direct
MSM
$7.02B
| $111K | ﹤0.01% |
1,200
-200
| -14% | -$17.9K |
|
4958
CALL
Old National Bancorp
ONB
$10.1B
| $111K | ﹤0.01% |
5,000
+3,700
| +285% | +$86.4K |
|
4959
CALL
AppFolio
APPF
$5.85B
| $110K | ﹤0.01% |
700
-1,000
| -59% | -$189K |
|
|
SUIG
4960
CALL
Sui Group Holdings
SUIG
$80.1M
| $110K | ﹤0.01% |
91,300
-93,500
| -51% | -$138K |
|
4961
CALL
ProFrac Holding
ACDC
$771M
| $110K | ﹤0.01% |
17,800
+10,400
| +141% | +$55.7K |
|
4962
CALL
Suburban Propane Partners
SPH
$1.23B
| $110K | ﹤0.01% |
5,600
+3,900
| +229% | +$77.8K |
|
4963
CALL
Manulife Financial
MFC
$72.6B
| $110K | ﹤0.01% |
3,200
-3,400
| -52% | -$122K |
|
4964
PUT
RUM Group Inc
RUM
$1.57B
| $110K | ﹤0.01% |
21,600
-218,500
| -91% | -$1.25M |
|
4965
PUT
Cincinnati Financial
CINF
$28.3B
| $110K | ﹤0.01% |
700
+500
| +250% | +$81.3K |
|
|
APLS
4966
DELISTED
Apellis Pharmaceuticals
APLS
| $110K | ﹤0.01% |
2,735
-24,452
| -90% | -$527K |
|
4967
Zura Bio
ZURA
$497M
| $110K | ﹤0.01% |
18,491
-12,670
| -41% | -$76.5K |
|
4968
CALL
Universal Display
OLED
$3.71B
| $110K | ﹤0.01% |
1,200
-3,000
| -71% | -$332K |
|
4969
CALL
Fossil Group
FOSL
$239M
| $110K | ﹤0.01% |
25,500
-99,600
| -80% | -$402K |
|
4970
CALL
Ryanair
RYAAY
$29.5B
| $110K | ﹤0.01% |
1,900
+1,700
| +850% | +$112K |
|
4971
Greenlight Captial
GLRE
$563M
| $110K | ﹤0.01% |
6,346
+6,251
| +6,580% | +$91K |
|
|
CHCT
4972
CALL
Community Healthcare Trust
CHCT
$537M
| $110K | ﹤0.01% |
6,900
+6,300
| +1,050% | +$106K |
|
4973
CALL
Immuneering
IMRX
$279M
| $110K | ﹤0.01% |
20,800
+8,000
| +63% | +$41K |
|
|
GEMI
4974
PUT
Gemini Space Station
GEMI
$542M
| $110K | ﹤0.01% |
24,800
-2,800
| -10% | -$22K |
|
4975
Hamilton Lane
HLNE
$3.63B
| $110K | ﹤0.01% |
+1,102
| New | +$135K |
|
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.