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 | |
|---|---|---|---|---|---|---|
2451
UFP Technologies
UFPT
$1.84B
| $1.18M | ﹤0.01% |
+6,067
| New | +$939K |
|
2452
CALL
G-III Apparel Group
GIII
$1.47B
| $1.18M | ﹤0.01% |
61,000
-4,100
| -6% | -$70.6K |
|
2453
CALL
RBC Bearings
RBC
$18.8B
| $1.17M | ﹤0.01% |
5,400
+400
| +8% | +$86.7K |
|
|
SGEN
2454
DELISTED
Seagen Inc. Common Stock
SGEN
| $1.17M | ﹤0.01% |
6,101
+5,493
| +903% | +$1.09M |
|
2455
CALL
Applied Industrial Technologies
AIT
$12.8B
| $1.17M | ﹤0.01% |
8,100
-500
| -6% | -$66.7K |
|
2456
PUT
Wabtec
WAB
$51.1B
| $1.17M | ﹤0.01% |
10,700
-2,300
| -18% | -$228K |
|
|
LOGC
2457
PUT
DELISTED
ContextLogic
LOGC
| $1.17M | ﹤0.01% |
178,300
+170,533
| +2,196% | +$1.35M |
|
|
SKX
2458
DELISTED
Skechers
SKX
| $1.17M | ﹤0.01% |
22,263
+20,773
| +1,394% | +$1.06M |
|
|
ARCH
2459
PUT
DELISTED
Arch Resources, Inc.
ARCH
| $1.17M | ﹤0.01% |
10,400
-200
| -2% | -$24K |
|
2460
PUT
Alpha and Omega Semiconductor
AOSL
$923M
| $1.17M | ﹤0.01% |
35,700
+33,800
| +1,779% | +$909K |
|
2461
CALL
Sundial Growers
SNDL
$325M
| $1.17M | ﹤0.01% |
853,700
-90,000
| -10% | -$137K |
|
2462
CALL
CVR Partners
UAN
$1.3B
| $1.17M | ﹤0.01% |
14,500
-9,400
| -39% | -$824K |
|
2463
CALL
Credit Acceptance
CACC
$6B
| $1.17M | ﹤0.01% |
2,300
+600
| +35% | +$281K |
|
2464
PUT
Shift4
FOUR
$3.84B
| $1.17M | ﹤0.01% |
17,200
-42,000
| -71% | -$2.75M |
|
2465
CALL
Revvity
RVTY
$12.3B
| $1.16M | ﹤0.01% |
9,800
+7,400
| +308% | +$909K |
|
|
HBI
2466
PUT
DELISTED
Hanesbrands
HBI
| $1.16M | ﹤0.01% |
256,200
-147,700
| -37% | -$675K |
|
2467
CALL
Thryv Holdings
THRY
$169M
| $1.16M | ﹤0.01% |
47,300
+40,300
| +576% | +$937K |
|
|
AVDX
2468
CALL
DELISTED
AvidXchange
AVDX
| $1.16M | ﹤0.01% |
112,000
+96,900
| +642% | +$872K |
|
2469
Vale
VALE
$62.9B
| $1.16M | ﹤0.01% |
+86,646
| New | +$1.23M |
|
|
DFTX
2470
CALL
Definium Therapeutics
DFTX
$5.73B
| $1.16M | ﹤0.01% |
324,400
+9,900
| +3% | +$34.1K |
|
2471
NetEase
NTES
$76.5B
| $1.16M | ﹤0.01% |
+11,979
| New | +$1.08M |
|
2472
PUT
Ionis Pharmaceuticals
IONS
$9.35B
| $1.16M | ﹤0.01% |
28,200
+9,500
| +51% | +$365K |
|
2473
CALL
Applied Digital
APLD
$7.77B
| $1.16M | ﹤0.01% |
+123,700
| New | +$737K |
|
2474
PUT
Costamare
CMRE
$1.9B
| $1.15M | ﹤0.01% |
119,200
+43,600
| +58% | +$391K |
|
2475
Autoliv
ALV
$8.6B
| $1.15M | ﹤0.01% |
+13,541
| New | +$1.17M |
|
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.