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 | |
|---|---|---|---|---|---|---|
3351
PUT
Mistras Group
MG
$688M
| $606K | ﹤0.01% |
34,700
+13,300
| +62% | +$237K |
|
3352
CALL
Vipshop
VIPS
$5.93B
| $606K | ﹤0.01% |
45,700
+31,600
| +224% | +$452K |
|
3353
PUT
Allegro MicroSystems
ALGM
$6.89B
| $606K | ﹤0.01% |
8,700
+8,300
| +2,075% | +$388K |
|
3354
PUT
TORM
TRMD
$3.64B
| $605K | ﹤0.01% |
23,200
-14,200
| -38% | -$430K |
|
|
PEW
3355
PUT
GrabAGun Digital Holdings
PEW
$62.3M
| $604K | ﹤0.01% |
265,100
+2,100
| +0.8% | +$5.82K |
|
3356
PUT
Imperial Petroleum
IMPP
$228M
| $604K | ﹤0.01% |
131,100
-16,000
| -11% | -$77.8K |
|
3357
CALL
Avnet
AVT
$8.33B
| $604K | ﹤0.01% |
6,800
-2,400
| -26% | -$196K |
|
3358
UL Solutions
ULS
$13.1B
| $604K | ﹤0.01% |
5,928
+4,406
| +289% | +$417K |
|
3359
CALL
Bentley Systems
BSY
$9.45B
| $604K | ﹤0.01% |
20,200
+10,400
| +106% | +$338K |
|
3360
Listed Funds Trust Roundhill Magnificent Seven ETF
MAGS
$5.34B
| $603K | ﹤0.01% |
+9,380
| New | +$619K |
|
3361
CALL
Equity Bancshares
EQBK
$989M
| $603K | ﹤0.01% |
+12,300
| New | +$568K |
|
|
AIS
3362
VistaShares Artificial Intelligence Supercycle ETF
AIS
$1.05B
| $602K | ﹤0.01% |
7,057
+7,044
| +54,185% | +$470K |
|
3363
IES Holdings
IESC
$12.8B
| $602K | ﹤0.01% |
+1,638
| New | +$529K |
|
3364
RBC Bearings
RBC
$16B
| $602K | ﹤0.01% |
934
-224
| -19% | -$133K |
|
3365
PUT
Tenable Holdings
TENB
$3.8B
| $601K | ﹤0.01% |
16,300
+15,900
| +3,975% | +$374K |
|
3366
Recursion Pharmaceuticals
RXRX
$1.98B
| $601K | ﹤0.01% |
163,686
+66,568
| +69% | +$222K |
|
3367
Oceaneering
OII
$4.56B
| $601K | ﹤0.01% |
14,822
+10,428
| +237% | +$393K |
|
3368
Direxion Daily AAPL Bull 2X ETF
AAPU
$175M
| $600K | ﹤0.01% |
17,194
-11,214
| -39% | -$394K |
|
3369
Agilon Health
AGL
$1.34B
| $599K | ﹤0.01% |
5,593
+1,348
| +32% | +$88.3K |
|
3370
Galicia Financial Group
GGAL
$5.94B
| $599K | ﹤0.01% |
11,971
-11,683
| -49% | -$550K |
|
3371
Marriott International
MAR
$93.5B
| $599K | ﹤0.01% |
+1,615
| New | +$596K |
|
3372
Klaviyo
KVYO
$4.38B
| $598K | ﹤0.01% |
39,585
+22,376
| +130% | +$371K |
|
3373
CALL
Norfolk Southern
NSC
$70.3B
| $598K | ﹤0.01% |
1,900
+100
| +6% | +$30.8K |
|
3374
Sundial Growers
SNDL
$342M
| $598K | ﹤0.01% |
442,677
+44,743
| +11% | +$64.1K |
|
3375
CALL
Eve Holding
EVEX
$697M
| $596K | ﹤0.01% |
237,600
-41,700
| -15% | -$120K |
|
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.