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 | |
|---|---|---|---|---|---|---|
|
MRNS
2651
CALL
DELISTED
Marinus Pharmaceuticals, Inc
MRNS
| $949K | ﹤0.01% |
87,400
+64,600
| +283% | +$553K |
|
2652
PUT
Ascendis Pharma A/S
ASND
$16.7B
| $946K | ﹤0.01% |
10,600
-1,900
| -15% | -$165K |
|
2653
CALL
Bread Financial
BFH
$4.21B
| $944K | ﹤0.01% |
30,100
+7,300
| +32% | +$210K |
|
2654
Sprott Uranium Miners ETF
URNM
$1.78B
| $944K | ﹤0.01% |
28,146
+14,693
| +109% | +$465K |
|
|
DICE
2655
PUT
DELISTED
DICE Therapeutics, Inc. Common Stock
DICE
| $943K | ﹤0.01% |
20,300
+3,600
| +22% | +$124K |
|
2656
CALL
Portillo's
PTLO
$315M
| $941K | ﹤0.01% |
41,800
-40,600
| -49% | -$846K |
|
2657
CALL
AllianceBernstein
AB
$3.47B
| $939K | ﹤0.01% |
29,200
+5,000
| +21% | +$171K |
|
2658
PUT
JetBlue
JBLU
$1.96B
| $938K | ﹤0.01% |
105,900
+12,300
| +13% | +$89.4K |
|
2659
CALL
Genius Sports
GENI
$1.73B
| $937K | ﹤0.01% |
151,400
-2,400
| -2% | -$12K |
|
2660
CALL
Eagle Materials
EXP
$6.6B
| $932K | ﹤0.01% |
5,000
+3,000
| +150% | +$478K |
|
|
PARA
2661
DELISTED
Paramount Global Class B
PARA
| $932K | ﹤0.01% |
58,636
-334,114
| -85% | -$6.03M |
|
2662
CALL
GeneDx Holdings
WGS
$1.75B
| $932K | ﹤0.01% |
156,400
+151,591
| +3,152% | +$1.2M |
|
2663
CALL
Stride
LRN
$3.69B
| $930K | ﹤0.01% |
25,000
+3,200
| +15% | +$128K |
|
2664
PUT
Novavax
NVAX
$1.23B
| $930K | ﹤0.01% |
125,300
-102,300
| -45% | -$804K |
|
|
WCN
2665
CALL
Waste Connections
WCN
$42.8B
| $929K | ﹤0.01% |
6,500
+6,400
| +6,400% | +$893K |
|
2666
Amylyx Pharmaceuticals
AMLX
$2.05B
| $928K | ﹤0.01% |
+43,055
| New | +$1.16M |
|
2667
PUT
Kanzhun
BZ
$6.89B
| $928K | ﹤0.01% |
61,700
+24,600
| +66% | +$412K |
|
2668
CALL
Kornit Digital
KRNT
$706M
| $928K | ﹤0.01% |
31,600
+18,300
| +138% | +$413K |
|
2669
KLA
KLAC
$275B
| $926K | ﹤0.01% |
+19,100
| New | +$798K |
|
2670
Realty Income
O
$61.2B
| $926K | ﹤0.01% |
15,495
-4,558
| -23% | -$278K |
|
2671
PUT
American Vanguard Corp
AVD
$73.5M
| $925K | ﹤0.01% |
51,800
+12,500
| +32% | +$231K |
|
2672
CALL
Ouster
OUST
$2.29B
| $923K | ﹤0.01% |
187,000
+161,130
| +623% | +$842K |
|
2673
PUT
Sundial Growers
SNDL
$325M
| $923K | ﹤0.01% |
674,000
+83,200
| +14% | +$126K |
|
2674
PUT
Brinker International
EAT
$8.02B
| $922K | ﹤0.01% |
25,200
+700
| +3% | +$26.4K |
|
2675
Kinross Gold
KGC
$28.5B
| $922K | ﹤0.01% |
193,493
+146,893
| +315% | +$733K |
|
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.