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 |
Microsoft
MSFT
|
+$114M |
| 2 |
NVIDIA
NVDA
|
+$85.9M |
| 3 |
Citigroup
C
|
+$61.5M |
| 4 |
Berkshire Hathaway Class B
BRK.B
|
+$45.5M |
| 5 |
Pfizer
PFE
|
+$41.6M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Apple
AAPL
|
+$467M |
| 2 |
Vanguard S&P 500 ETF
VOO
|
+$71.2M |
| 3 |
Meta Platforms (Facebook)
META
|
+$47.6M |
| 4 |
Intel
INTC
|
+$41.9M |
| 5 |
TSMC
TSM
|
+$35.9M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.51% |
| 2 | Financials | 0.35% |
| 3 | Consumer Discretionary | 0.3% |
| 4 | Healthcare | 0.25% |
| 5 | Industrials | 0.18% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
576
PUT
Best Buy
BBY
$17.8B
| $16.8M | 0.02% |
265,700
-155,200
| -37% | -$11.5M |
|
577
CALL
NXP Semiconductors
NXPI
$70B
| $16.8M | 0.02% |
113,600
+29,500
| +35% | +$4.94M |
|
578
CALL
Align Technology
ALGN
$12B
| $16.7M | 0.02% |
80,600
+52,800
| +190% | +$13.6M |
|
579
PUT
CME Group
CME
$91.9B
| $16.5M | 0.02% |
93,100
+400
| +0.4% | +$79.1K |
|
580
CALL
GSK
GSK
$102B
| $16.4M | 0.02% |
649,000
+317,560
| +96% | +$12M |
|
581
Paychex
PAYX
$39.4B
| $16.4M | 0.02% |
+145,954
| New | +$18.1M |
|
|
MRO
582
PUT
DELISTED
Marathon Oil Corporation
MRO
| $16.4M | 0.02% |
724,500
-253,200
| -26% | -$6M |
|
583
PUT
Diamondback Energy
FANG
$57.8B
| $16.3M | 0.02% |
135,500
-226,700
| -63% | -$28.3M |
|
584
CALL
Duke Energy
DUK
$101B
| $16.3M | 0.02% |
175,400
-6,100
| -3% | -$655K |
|
|
585
PUT
Paychex
PAYX
$39.4B
| $16.2M | 0.02% |
144,700
+73,000
| +102% | +$9.05M |
|
586
PUT
Digital Realty Trust
DLR
$66.4B
| $16.2M | 0.02% |
163,500
+58,100
| +55% | +$7.13M |
|
587
CALL
Skyworks Solutions
SWKS
$9.1B
| $16.2M | 0.02% |
189,800
+31,400
| +20% | +$3.21M |
|
|
588
PUT
NXP Semiconductors
NXPI
$70B
| $16.2M | 0.02% |
109,600
-2,000
| -2% | -$335K |
|
589
PUT
Steel Dynamics
STLD
$34.7B
| $16.1M | 0.02% |
226,800
+94,600
| +72% | +$7.16M |
|
590
PUT
Sunrun
RUN
$2.48B
| $16.1M | 0.02% |
582,800
+288,200
| +98% | +$8.96M |
|
|
591
PUT
Align Technology
ALGN
$12B
| $16.1M | 0.02% |
77,600
-13,200
| -15% | -$3.4M |
|
592
PUT
Invesco CurrencyShares Japanese Yen Trust
FXY
$423M
| $16M | 0.02% |
248,000
+54,900
| +28% | +$3.71M |
|
593
CALL
Wolfspeed
WOLF
$1.35B
| $16M | 0.02% |
155,000
+54,900
| +55% | +$5.26M |
|
594
CALL
KLA
KLAC
$286B
| $15.9M | 0.02% |
526,000
+437,000
| +491% | +$15.1M |
|
595
PUT
Trump Media & Technology Group
DJT
$2.46B
| $15.8M | 0.02% |
937,300
+392,700
| +72% | +$10.4M |
|
596
PUT
Humana
HUM
$47.4B
| $15.7M | 0.02% |
32,400
-29,900
| -48% | -$14.5M |
|
597
CALL
Automatic Data Processing
ADP
$97.1B
| $15.7M | 0.02% |
69,400
+6,700
| +11% | +$1.58M |
|
598
Mercado Libre
MELI
$91.2B
| $15.6M | 0.02% |
18,860
+5,185
| +38% | +$4.46M |
|
599
CALL
Warner Bros
WBD
$65.1B
| $15.6M | 0.02% |
1,356,300
-2,420,000
| -64% | -$32.9M |
|
600
PUT
Lucid Motors
LCID
$2.52B
| $15.5M | 0.02% |
110,980
-105,810
| -49% | -$18.3M |
|
Similar funds
Simplex Trading's Q3 2022 Portfolio in Review
As of Q3 2022, Simplex Trading held 11,570 positions worth $88.5B, down 6% from $94.1B the previous quarter. Its ten largest holdings account for 38% of the portfolio.
Simplex Trading's Q3 2022 filing shows 1,564 new, 4,281 increased, 3,851 reduced and 1,575 closed positions. Its largest new stake was Microsoft: 432,062 shares worth $101M. The largest sale was Apple, an estimated $467M.
By sector, the portfolio is most concentrated in Technology at 0.51% of assets, down from 0.84% a quarter earlier, followed by Financials and Consumer Discretionary.
- Simplex Trading's largest Q3 2022 buy was Microsoft: 432,062 shares worth $101M.
- Simplex Trading added most to NVIDIA in Q3 2022, an estimated $85.9M increase.
- Simplex Trading's biggest Q3 2022 reduction was Apple, cutting an estimated $467M.
- Simplex Trading fully exited iShares Core S&P 500 ETF in Q3 2022, selling an estimated $34.3M.
- Simplex Trading's ten largest holdings make up 38% of its $88.5B portfolio in Q3 2022.
- Simplex Trading opened 1,564 new positions and closed 1,575 in Q3 2022.
- Simplex Trading's portfolio value fell 6% quarter-over-quarter to $88.5B.
Based on Simplex Trading's 13F filing for Q3 2022, filed 4 Nov 2022.