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 | |
|---|---|---|---|---|---|---|
551
CALL
Analog Devices
ADI
$191B
| $16.3M | 0.01% |
41,100
-101,900
| -71% | -$40.3M |
|
|
BULL
552
CALL
Webull Corp
BULL
$3.88B
| $16.3M | 0.01% |
2,499,600
-232,900
| -9% | -$1.51M |
|
553
PUT
Semtech
SMTC
$17B
| $16.3M | 0.01% |
100,500
+95,000
| +1,727% | +$12.4M |
|
554
PUT
Roku
ROKU
$22.7B
| $16.2M | 0.01% |
117,500
-38,800
| -25% | -$4.73M |
|
555
IBM
IBM
$212B
| $16.1M | 0.01% |
+57,427
| New | +$14.5M |
|
556
CALL
Royal Caribbean
RCL
$64.9B
| $16.1M | 0.01% |
50,800
-16,700
| -25% | -$4.67M |
|
557
PUT
Marathon Petroleum
MPC
$111B
| $16.1M | 0.01% |
62,800
-76,300
| -55% | -$18.7M |
|
558
PUT
SiriusXM
SIRI
$8.72B
| $16M | 0.01% |
543,000
+32,200
| +6% | +$865K |
|
559
PUT
Devon Energy
DVN
$51.8B
| $16M | 0.01% |
387,600
+12,400
| +3% | +$575K |
|
560
CALL
Linde
LIN
$217B
| $15.9M | 0.01% |
30,600
+9,600
| +46% | +$4.86M |
|
561
PUT
Pinterest
PINS
$10.7B
| $15.7M | 0.01% |
747,200
+311,200
| +71% | +$6.25M |
|
562
CALL
Ondas Inc
ONDS
$4.45B
| $15.7M | 0.01% |
1,905,700
-519,300
| -21% | -$5.12M |
|
563
CALL
Etsy
ETSY
$6.28B
| $15.6M | 0.01% |
207,700
-33,100
| -14% | -$2.13M |
|
564
CALL
Cameco
CCJ
$38.4B
| $15.6M | 0.01% |
152,800
-154,300
| -50% | -$17.3M |
|
565
CALL
Energy Fuels
UUUU
$3.01B
| $15.5M | 0.01% |
1,072,400
+12,800
| +1% | +$235K |
|
566
PUT
Celestica
CLS
$46.1B
| $15.5M | 0.01% |
42,600
+28,900
| +211% | +$10.8M |
|
567
CALL
Apollo Global Management
APO
$71.9B
| $15.4M | 0.01% |
130,500
-27,100
| -17% | -$3.41M |
|
568
CALL
Nucor
NUE
$56.1B
| $15.4M | 0.01% |
69,300
+27,600
| +66% | +$6.25M |
|
569
Pfizer
PFE
$163B
| $15.4M | 0.01% |
640,977
-625,708
| -49% | -$16.4M |
|
570
CALL
W.W. Grainger
GWW
$58.5B
| $15.4M | 0.01% |
11,300
-10,800
| -49% | -$13.3M |
|
571
CALL
Biogen
BIIB
$33.6B
| $15.3M | 0.01% |
70,700
-1,200
| -2% | -$230K |
|
|
572
PUT
Nucor
NUE
$56.1B
| $15.3M | 0.01% |
68,500
-1,800
| -3% | -$407K |
|
|
573
PUT
Linde
LIN
$217B
| $15.3M | 0.01% |
29,400
+700
| +2% | +$355K |
|
574
CALL
KKR & Co
KKR
$86.8B
| $15.2M | 0.01% |
166,000
+2,300
| +1% | +$223K |
|
575
PUT
Workday
WDAY
$45.7B
| $15.2M | 0.01% |
124,400
+58,000
| +87% | +$7.35M |
|
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.