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 | |
|---|---|---|---|---|---|---|
3676
CALL
The Joint Corp
JYNT
$123M
| $349K | ﹤0.01% |
25,900
+8,600
| +50% | +$126K |
|
3677
PUT
Navient
NAVI
$822M
| $349K | ﹤0.01% |
18,800
+7,600
| +68% | +$125K |
|
3678
CALL
Nexstar Media Group
NXST
$5.92B
| $349K | ﹤0.01% |
2,100
-6,300
| -75% | -$1.04M |
|
3679
Phathom Pharmaceuticals
PHAT
$930M
| $348K | ﹤0.01% |
24,326
-5,085
| -17% | -$58.6K |
|
|
SGI
3680
CALL
Somnigroup International
SGI
$15.2B
| $348K | ﹤0.01% |
8,700
-19,900
| -70% | -$749K |
|
3681
ProShares Ultra QQQ
QLD
$12.2B
| $347K | ﹤0.01% |
+10,796
| New | +$292K |
|
3682
Target Hospitality
TH
$1.47B
| $347K | ﹤0.01% |
+25,869
| New | +$358K |
|
|
GDEN
3683
CALL
DELISTED
Golden Entertainment
GDEN
| $346K | ﹤0.01% |
8,300
+4,700
| +131% | +$197K |
|
3684
CALL
Rogers Communications
RCI
$18.8B
| $346K | ﹤0.01% |
7,600
-17,400
| -70% | -$816K |
|
|
TIGR
3685
CALL
UP Fintech Holding
TIGR
$858M
| $346K | ﹤0.01% |
121,900
-877,400
| -88% | -$2.6M |
|
3686
PUT
Protagonist Therapeutics
PTGX
$8.8B
| $345K | ﹤0.01% |
12,500
-10,900
| -47% | -$273K |
|
3687
CALL
RPC Inc
RES
$1.14B
| $345K | ﹤0.01% |
48,300
-114,200
| -70% | -$836K |
|
|
SAVE
3688
DELISTED
Spirit Airlines, Inc.
SAVE
| $345K | ﹤0.01% |
+20,114
| New | +$329K |
|
3689
PUT
Alcon
ALC
$33.7B
| $344K | ﹤0.01% |
4,200
-53,400
| -93% | -$4.08M |
|
|
HIMX
3690
PUT
Himax Technologies
HIMX
$2.09B
| $344K | ﹤0.01% |
51,100
+5,100
| +11% | +$35.8K |
|
3691
Liberty Global Class A
LBTYA
$3.49B
| $343K | ﹤0.01% |
20,403
-48,674
| -70% | -$865K |
|
|
SAGE
3692
CALL
DELISTED
Sage Therapeutics
SAGE
| $343K | ﹤0.01% |
7,300
+700
| +11% | +$34.8K |
|
3693
CALL
Sun Life Financial
SLF
$46.6B
| $343K | ﹤0.01% |
6,600
-600
| -8% | -$29.5K |
|
3694
PUT
Western Union
WU
$2.58B
| $342K | ﹤0.01% |
29,200
+3,900
| +15% | +$44.9K |
|
3695
PUT
Emergent Biosolutions
EBS
$377M
| $341K | ﹤0.01% |
46,500
+40,400
| +662% | +$375K |
|
3696
PUT
Tenaris
TS
$28.1B
| $341K | ﹤0.01% |
11,400
-80,800
| -88% | -$2.24M |
|
3697
CALL
Tower Semiconductor
TSEM
$22.9B
| $341K | ﹤0.01% |
9,100
+1,400
| +18% | +$57.9K |
|
|
SILV
3698
PUT
DELISTED
SilverCrest Metals Inc. Common Shares
SILV
| $341K | ﹤0.01% |
58,300
+14,000
| +32% | +$91.9K |
|
3699
Alkami Technology
ALKT
$1.94B
| $340K | ﹤0.01% |
20,761
+3,055
| +17% | +$42.2K |
|
3700
PUT
Helmerich & Payne
HP
$3.31B
| $340K | ﹤0.01% |
9,600
-56,800
| -86% | -$1.94M |
|
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.