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
|
+$53.9M |
| 2 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$52.9M |
| 3 |
NVIDIA
NVDA
|
+$47.1M |
| 4 |
PayPal
PYPL
|
+$41.7M |
| 5 |
Alphabet (Google) Class C
GOOG
|
+$28.4M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Apple
AAPL
|
+$51.4M |
| 2 |
Walmart Inc
WMT
|
+$46.4M |
| 3 |
VanEck Oil Services ETF
OIH
|
+$34.2M |
| 4 |
Adobe
ADBE
|
+$33.5M |
| 5 |
Starbucks
SBUX
|
+$26.8M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.41% |
| 2 | Healthcare | 0.21% |
| 3 | Consumer Discretionary | 0.21% |
| 4 | Communication Services | 0.2% |
| 5 | Financials | 0.15% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
|
MCW
4626
CALL
DELISTED
Mister Car Wash
MCW
| $149K | ﹤0.01% |
15,500
+700
| +5% | +$6.07K |
|
4627
PureCycle Technologies
PCT
$1.19B
| $149K | ﹤0.01% |
13,966
-162,664
| -92% | -$1.18M |
|
|
RWT
4628
PUT
Redwood Trust
RWT
$588M
| $149K | ﹤0.01% |
23,500
+3,500
| +18% | +$21.9K |
|
4629
CALL
RxSight
RXST
$254M
| $149K | ﹤0.01% |
5,200
-9,000
| -63% | -$200K |
|
|
UCTT
4630
CALL
Ultra Clean Holdings
UCTT
$3.12B
| $149K | ﹤0.01% |
3,900
-12,200
| -76% | -$393K |
|
4631
PUT
John Wiley & Sons Class A
WLY
$2.83B
| $149K | ﹤0.01% |
4,400
+4,200
| +2,100% | +$153K |
|
4632
Yum China
YUMC
$15.7B
| $149K | ﹤0.01% |
+2,643
| New | +$159K |
|
|
DESP
4633
CALL
DELISTED
Despegar.com
DESP
| $148K | ﹤0.01% |
21,000
-5,800
| -22% | -$35.6K |
|
4634
PUT
FNB Corp
FNB
$6.76B
| $148K | ﹤0.01% |
13,000
+9,400
| +261% | +$106K |
|
4635
International Seaways
INSW
$4.68B
| $148K | ﹤0.01% |
3,893
+2,106
| +118% | +$80.7K |
|
4636
CALL
Ryman Hospitality Properties
RHP
$8.56B
| $148K | ﹤0.01% |
1,600
+1,400
| +700% | +$129K |
|
4637
Simon Property Group
SPG
$76.4B
| $148K | ﹤0.01% |
+1,289
| New | +$140K |
|
|
FRC
4638
DELISTED
First Republic Bank
FRC
| $148K | ﹤0.01% |
270,600
+268,700
| +14,142% | +$3.28M |
|
|
AEVA
4639
PUT
Aeva Technologies
AEVA
$956M
| $147K | ﹤0.01% |
23,600
+3,980
| +20% | +$22.7K |
|
4640
CALL
Corporacion America
CAAP
$4.17B
| $147K | ﹤0.01% |
12,700
+1,400
| +12% | +$15.4K |
|
4641
PUT
Clean Harbors
CLH
$17.2B
| $147K | ﹤0.01% |
900
+500
| +125% | +$73.1K |
|
4642
PUT
Gaotu Techedu
GOTU
$405M
| $147K | ﹤0.01% |
50,900
-141,200
| -74% | -$445K |
|
4643
MannKind Corp
MNKD
$1.19B
| $147K | ﹤0.01% |
+36,211
| New | +$151K |
|
4644
CALL
Titan Machinery
TITN
$420M
| $147K | ﹤0.01% |
5,000
+4,300
| +614% | +$130K |
|
4645
Warby Parker
WRBY
$3.19B
| $147K | ﹤0.01% |
12,594
-882
| -7% | -$10K |
|
|
JOYY
4646
PUT
JOYY Inc
JOYY
$3.73B
| $147K | ﹤0.01% |
4,800
+4,600
| +2,300% | +$135K |
|
4647
CALL
Acuity Brands
AYI
$9.99B
| $146K | ﹤0.01% |
900
-4,700
| -84% | -$750K |
|
4648
CALL
Curtiss-Wright
CW
$25.1B
| $146K | ﹤0.01% |
+800
| New | +$136K |
|
4649
Jack Henry & Associates
JKHY
$11.4B
| $146K | ﹤0.01% |
+875
| New | +$136K |
|
4650
CALL
Popular Inc
BPOP
$11B
| $145K | ﹤0.01% |
2,400
-1,100
| -31% | -$64.8K |
|
Similar funds
Simplex Trading's Q2 2023 Portfolio in Review
As of Q2 2023, Simplex Trading held 10,535 positions worth $122B, up 6.9% from $114B the previous quarter. Its ten largest holdings account for 43% of the portfolio.
Simplex Trading's Q2 2023 filing shows 1,474 new, 3,350 increased, 3,913 reduced and 1,517 closed positions. Its largest new stake was Microsoft: 171,935 shares worth $58.5M. The largest sale was Apple, an estimated $51.4M.
By sector, the portfolio is most concentrated in Technology at 0.41% of assets, down from 0.42% a quarter earlier, followed by Healthcare and Consumer Discretionary.
- Simplex Trading's largest Q2 2023 buy was Microsoft: 171,935 shares worth $58.5M.
- Simplex Trading added most to iShares 20+ Year Treasury Bond ETF in Q2 2023, an estimated $52.9M increase.
- Simplex Trading's biggest Q2 2023 reduction was Adobe, cutting an estimated $33.5M.
- Simplex Trading fully exited Apple in Q2 2023, selling an estimated $51.4M.
- Simplex Trading's ten largest holdings make up 43% of its $122B portfolio in Q2 2023.
- Simplex Trading opened 1,474 new positions and closed 1,517 in Q2 2023.
- Simplex Trading's portfolio value rose 6.9% quarter-over-quarter to $122B.
Based on Simplex Trading's 13F filing for Q2 2023, filed 4 Aug 2023.