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 Russell 2000 ETF
IWM
|
+$146M |
| 2 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$108M |
| 3 |
Apple
AAPL
|
+$62.9M |
| 4 |
Tesla
TSLA
|
+$51.9M |
| 5 |
Micron Technology
MU
|
+$39.5M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$108M |
| 2 |
Meta Platforms (Facebook)
META
|
+$104M |
| 3 |
Advanced Micro Devices
AMD
|
+$92.1M |
| 4 |
Amazon
AMZN
|
+$90.3M |
| 5 |
TSMC
TSM
|
+$82.9M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Miscellaneous | 98.28% |
| 2 | Technology | 0.76% |
| 3 | Consumer Discretionary | 0.21% |
| 4 | Communication Services | 0.19% |
| 5 | Healthcare | 0.15% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
|
ALM
2801
PUT
Almonty Industries
ALM
$3.96B
| $980K | ﹤0.01% |
59,200
+50,500
| +580% | +$964K |
|
|
PURR
2802
Hyperliquid Strategies Inc
PURR
$2.54B
| $980K | ﹤0.01% |
124,539
+103,412
| +489% | +$765K |
|
2803
PUT
MarketAxess Holdings
MKTX
$5.78B
| $976K | ﹤0.01% |
8,600
+8,500
| +8,500% | +$1.21M |
|
|
MIAX
2804
Miami International Holdings
MIAX
$3.46B
| $976K | ﹤0.01% |
26,254
+1,238
| +5% | +$55.4K |
|
2805
PUT
Builders FirstSource
BLDR
$6.37B
| $975K | ﹤0.01% |
10,900
-16,000
| -59% | -$1.28M |
|
2806
PUT
Acadia Healthcare
ACHC
$2.62B
| $974K | ﹤0.01% |
33,000
-7,800
| -19% | -$200K |
|
2807
CALL
Invitation Homes
INVH
$15.7B
| $973K | ﹤0.01% |
32,200
+24,700
| +329% | +$699K |
|
2808
CALL
Global E Online
GLBE
$6.75B
| $972K | ﹤0.01% |
28,000
+19,400
| +226% | +$614K |
|
|
PDS
2809
Precision Drilling
PDS
$1.03B
| $972K | ﹤0.01% |
12,685
-14,176
| -53% | -$1.29M |
|
2810
Archer Aviation
ACHR
$4.32B
| $971K | ﹤0.01% |
205,356
-46,539
| -18% | -$271K |
|
2811
CBRE Group
CBRE
$39B
| $971K | ﹤0.01% |
7,208
+4,271
| +145% | +$588K |
|
2812
Mineralys Therapeutics
MLYS
$2.29B
| $971K | ﹤0.01% |
35,979
+16,417
| +84% | +$450K |
|
2813
PUT
Pebblebrook Hotel Trust
PEB
$2.08B
| $971K | ﹤0.01% |
+50,000
| New | +$771K |
|
2814
Arthur J. Gallagher & Co
AJG
$59.2B
| $970K | ﹤0.01% |
+4,225
| New | +$897K |
|
2815
CALL
NovoCure
NVCR
$1.84B
| $968K | ﹤0.01% |
63,900
+20,400
| +47% | +$309K |
|
2816
PUT
Helen of Troy
HELE
$667M
| $968K | ﹤0.01% |
33,300
-200
| -0.6% | -$4.73K |
|
2817
CALL
Paycom
PAYC
$9.94B
| $968K | ﹤0.01% |
7,700
+500
| +7% | +$65.2K |
|
2818
Virtu Financial
VIRT
$4.72B
| $967K | ﹤0.01% |
16,238
-7,682
| -32% | -$404K |
|
2819
PUT
Carbon Collective Climate Solutions US Equity ETF
CCSO
$45M
| $967K | ﹤0.01% |
78,300
-41,700
| -35% | -$1.17M |
|
2820
PUT
Enovis
ENOV
$1.06B
| $967K | ﹤0.01% |
46,700
+46,600
| +46,600% | +$1.1M |
|
2821
CALL
indie Semiconductor
INDI
$700M
| $964K | ﹤0.01% |
214,700
-170,300
| -44% | -$679K |
|
2822
SLM Corp
SLM
$4.45B
| $964K | ﹤0.01% |
+37,151
| New | +$837K |
|
2823
CALL
RELX
RELX
$58.3B
| $963K | ﹤0.01% |
30,400
-3,300
| -10% | -$112K |
|
|
CNH
2824
CALL
CNH Industrial
CNH
$21.1B
| $962K | ﹤0.01% |
85,700
-140,300
| -62% | -$1.49M |
|
2825
PUT
Tyson Foods
TSN
$17.9B
| $962K | ﹤0.01% |
16,800
+11,300
| +205% | +$707K |
|
Similar funds
Simplex Trading's Q2 2026 Portfolio in Review
As of Q2 2026, Simplex Trading held 10,638 positions worth $171B, up 14% from $149B the previous quarter. Its ten largest holdings account for 50% of the portfolio.
Simplex Trading's Q2 2026 filing shows 1,714 new, 3,712 increased, 3,486 reduced and 1,487 closed positions. Its largest new stake was Micron Technology: 52,682 shares worth $60.8M. The largest sale was State Street SPDR S&P 500 ETF Trust, an estimated $108M.
By sector, the portfolio is most concentrated in Miscellaneous at 98% of assets, down from 98% a quarter earlier, followed by Technology and Consumer Discretionary.
- Simplex Trading's largest Q2 2026 buy was Micron Technology: 52,682 shares worth $60.8M.
- Simplex Trading added most to iShares Russell 2000 ETF in Q2 2026, an estimated $146M increase.
- Simplex Trading's biggest Q2 2026 reduction was State Street SPDR S&P 500 ETF Trust, cutting an estimated $108M.
- Simplex Trading fully exited Intel in Q2 2026, selling an estimated $76.6M.
- Simplex Trading's ten largest holdings make up 50% of its $171B portfolio in Q2 2026.
- Simplex Trading opened 1,714 new positions and closed 1,487 in Q2 2026.
- Simplex Trading's portfolio value rose 14% quarter-over-quarter to $171B.
Based on Simplex Trading's 13F filing for Q2 2026, filed 12 Aug 2026.