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 | |
|---|---|---|---|---|---|---|
2451
Ardelyx
ARDX
$1.25B
| $1.05M | ﹤0.01% |
174,861
+22,927
| +15% | +$152K |
|
2452
PUT
Arrowhead Research
ARWR
$12.2B
| $1.05M | ﹤0.01% |
+16,700
| New | +$1.06M |
|
2453
PUT
DHT Holdings
DHT
$3.01B
| $1.05M | ﹤0.01% |
57,300
-39,500
| -41% | -$629K |
|
2454
PUT
Syndax Pharmaceuticals
SNDX
$1.74B
| $1.05M | ﹤0.01% |
44,800
-14,300
| -24% | -$311K |
|
2455
PUT
Qfin Holdings
QFIN
$1.69B
| $1.05M | ﹤0.01% |
81,000
+61,400
| +313% | +$944K |
|
2456
PUT
TORM
TRMD
$3.07B
| $1.04M | ﹤0.01% |
37,400
+5,300
| +17% | +$135K |
|
2457
CALL
VeriSign
VRSN
$26.5B
| $1.04M | ﹤0.01% |
4,200
+800
| +24% | +$190K |
|
2458
PUT
Allison Transmission
ALSN
$9.52B
| $1.04M | ﹤0.01% |
+8,900
| New | +$1.01M |
|
2459
CALL
National Grid
NGG
$79.5B
| $1.04M | ﹤0.01% |
12,300
+10,800
| +720% | +$930K |
|
|
SUPV
2460
Grupo Supervielle
SUPV
$832M
| $1.04M | ﹤0.01% |
110,198
+40,351
| +58% | +$414K |
|
2461
PUT
MPLX
MPLX
$59B
| $1.04M | ﹤0.01% |
18,200
-84,600
| -82% | -$4.8M |
|
2462
CALL
Tencent Music
TME
$16B
| $1.04M | ﹤0.01% |
111,900
-199,300
| -64% | -$2.95M |
|
2463
CALL
HDFC Bank
HDB
$123B
| $1.04M | ﹤0.01% |
41,700
+32,700
| +363% | +$1.02M |
|
2464
PUT
TechnipFMC
FTI
$28.7B
| $1.04M | ﹤0.01% |
15,000
+9,800
| +188% | +$589K |
|
2465
PUT
Floor & Decor
FND
$6.1B
| $1.04M | ﹤0.01% |
20,400
-16,600
| -45% | -$1.08M |
|
2466
CALL
Old Dominion Freight Line
ODFL
$46.2B
| $1.04M | ﹤0.01% |
+5,300
| New | +$988K |
|
2467
CALL
Vista Energy
VIST
$7.35B
| $1.03M | ﹤0.01% |
13,700
-25,800
| -65% | -$1.5M |
|
2468
Hilton Worldwide
HLT
$73B
| $1.03M | ﹤0.01% |
3,394
-10,532
| -76% | -$3.19M |
|
2469
PUT
Republic Services
RSG
$67.3B
| $1.03M | ﹤0.01% |
4,700
+4,200
| +840% | +$921K |
|
2470
Sprott Uranium Miners ETF
URNM
$1.74B
| $1.03M | ﹤0.01% |
16,297
-54,449
| -77% | -$3.72M |
|
2471
PUT
TKO Group
TKO
$14B
| $1.03M | ﹤0.01% |
5,100
-10,500
| -67% | -$2.15M |
|
2472
CALL
Alarm.com
ALRM
$2.74B
| $1.03M | ﹤0.01% |
23,800
+23,100
| +3,300% | +$1.1M |
|
2473
PUT
ACM Research
ACMR
$4.64B
| $1.03M | ﹤0.01% |
26,100
-88,400
| -77% | -$4.69M |
|
2474
PUT
Amcor
AMCR
$21.1B
| $1.03M | ﹤0.01% |
25,800
+16,260
| +170% | +$719K |
|
2475
Hycroft Mining Holding Corp
HYMC
$1.84B
| $1.02M | ﹤0.01% |
29,119
+23,399
| +409% | +$905K |
|
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.