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 | |
|---|---|---|---|---|---|---|
4901
PUT
Forestar Group
FOR
$1.48B
| $115K | ﹤0.01% |
5,100
-3,700
| -42% | -$71.2K |
|
4902
PUT
Genius Sports
GENI
$1.95B
| $115K | ﹤0.01% |
18,600
+600
| +3% | +$3.01K |
|
|
GOGL
4903
CALL
DELISTED
Golden Ocean Group
GOGL
| $115K | ﹤0.01% |
15,300
-31,600
| -67% | -$263K |
|
4904
CALL
Landstar System
LSTR
$6.04B
| $115K | ﹤0.01% |
600
+500
| +500% | +$90.3K |
|
|
4905
PUT
Landstar System
LSTR
$6.04B
| $115K | ﹤0.01% |
600
-10,100
| -94% | -$1.82M |
|
4906
Magnachip Semiconductor
MX
$110M
| $115K | ﹤0.01% |
10,361
-16,163
| -61% | -$158K |
|
4907
PUT
Odyssey Marine Exploration
OMEX
$37.7M
| $115K | ﹤0.01% |
32,100
+29,700
| +1,238% | +$96.2K |
|
4908
Rayonier Advanced Materials
RYAM
$562M
| $115K | ﹤0.01% |
26,971
-56,366
| -68% | -$267K |
|
4909
CALL
Stoke Therapeutics
STOK
$1.84B
| $115K | ﹤0.01% |
10,900
+10,200
| +1,457% | +$109K |
|
4910
CALL
VirTra
VTSI
$33.1M
| $115K | ﹤0.01% |
15,200
+14,800
| +3,700% | +$98.8K |
|
4911
PUT
Xenon Pharmaceuticals
XENE
$6.1B
| $115K | ﹤0.01% |
3,000
+2,000
| +200% | +$79.5K |
|
4912
Autohome
ATHM
$2.62B
| $114K | ﹤0.01% |
3,923
-1,033
| -21% | -$30.8K |
|
4913
CALL
Axos Financial
AX
$5.58B
| $114K | ﹤0.01% |
2,900
-23,700
| -89% | -$918K |
|
4914
CALL
Century Communities
CCS
$1.98B
| $114K | ﹤0.01% |
1,500
-1,000
| -40% | -$66.9K |
|
4915
PUT
Digimarc Corp
DMRC
$143M
| $114K | ﹤0.01% |
3,900
+800
| +26% | +$19.7K |
|
|
GORV
4916
PUT
DELISTED
Lazydays
GORV
| $114K | ﹤0.01% |
330
-3
| -0.9% | -$1.03K |
|
4917
CALL
Leslie's
LESL
$8.33M
| $114K | ﹤0.01% |
610
-195
| -24% | -$40.3K |
|
|
OBE
4918
PUT
Obsidian Energy
OBE
$656M
| $114K | ﹤0.01% |
19,600
+800
| +4% | +$4.95K |
|
4919
CALL
Progyny
PGNY
$2.46B
| $114K | ﹤0.01% |
2,900
-4,400
| -60% | -$159K |
|
|
PLYA
4920
PUT
DELISTED
Playa Hotels & Resorts
PLYA
| $114K | ﹤0.01% |
14,100
| – | – |
|
4921
POET Technologies
POET
$1.1B
| $114K | ﹤0.01% |
26,007
+25,619
| +6,603% | +$110K |
|
4922
CALL
Visteon
VC
$2.85B
| $114K | ﹤0.01% |
800
-100
| -11% | -$14.3K |
|
|
WPRT
4923
PUT
Westport Fuel Systems
WPRT
$31.9M
| $114K | ﹤0.01% |
14,900
+12,970
| +672% | +$100K |
|
|
TBCH
4924
CALL
Turtle Beach Corp
TBCH
$238M
| $114K | ﹤0.01% |
9,800
-21,000
| -68% | -$234K |
|
|
AHRT
4925
PUT
AH Realty Trust
AHRT
$536M
| $113K | ﹤0.01% |
9,700
+1,500
| +18% | +$17.5K |
|
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.