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 |
Alphabet (Google) Class C
GOOG
|
+$40.1M |
| 2 |
Berkshire Hathaway Class B
BRK.B
|
+$12.5M |
| 3 |
Alibaba
BABA
|
+$10.5M |
| 4 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$9.89M |
| 5 |
Intel
INTC
|
+$9.83M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Apple
AAPL
|
+$35.7M |
| 2 |
Gilead Sciences
GILD
|
+$32.3M |
| 3 |
Amazon
AMZN
|
+$29M |
| 4 |
Booking.com
BKNG
|
+$28.4M |
| 5 |
Baidu
BIDU
|
+$13.3M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Communication Services | 7.76% |
| 2 | Consumer Discretionary | 7.62% |
| 3 | Healthcare | 7.24% |
| 4 | Technology | 6.95% |
| 5 | Financials | 4.83% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
2451
PUT
Vaalco Energy
EGY
$594M
| $17K | ﹤0.01% |
28
+4
| +17% | +$19 |
|
2452
ProShares UltraShort FTSE Europe
EPV
$11.6M
| $17K | ﹤0.01% |
64
+46
| +256% | +$13.6K |
|
2453
CALL
Fidelity National Information Services
FIS
$21.5B
| $17K | ﹤0.01% |
+53
| New | +$3.46K |
|
2454
PUT
Globus Medical
GMED
$10.4B
| $17K | ﹤0.01% |
87
+72
| +480% | +$1.75K |
|
2455
Gogo Inc
GOGO
$515M
| $17K | ﹤0.01% |
+892
| New | +$15.2K |
|
2456
iShares Latin America 40 ETF
ILF
$3.77B
| $17K | ﹤0.01% |
+611
| New | +$18.7K |
|
2457
PUT
International Paper
IP
$22.3B
| $17K | ﹤0.01% |
317
-237
| -43% | -$12.3K |
|
|
JKS
2458
PUT
JinkoSolar
JKS
$775M
| $17K | ﹤0.01% |
46
-6
| -12% | -$127 |
|
2459
CALL
KB Home
KBH
$3.48B
| $17K | ﹤0.01% |
128
+33
| +35% | +$461 |
|
2460
Kosmos Energy
KOS
$1.56B
| $17K | ﹤0.01% |
2,243
-1,939
| -46% | -$16.3K |
|
2461
PUT
Motorola Solutions
MSI
$69.4B
| $17K | ﹤0.01% |
91
+52
| +133% | +$3.44K |
|
2462
PUT
NextEra Energy
NEE
$187B
| $17K | ﹤0.01% |
468
+4
| +0.9% | +$106 |
|
2463
PUT
Nektar Therapeutics
NKTR
$2.39B
| $17K | ﹤0.01% |
10
-7
| -41% | -$1.44K |
|
2464
Newell Brands
NWL
$2.16B
| $17K | ﹤0.01% |
+455
| New | +$17.5K |
|
2465
PUT
Pacira BioSciences
PCRX
$1.02B
| $17K | ﹤0.01% |
15
-5
| -25% | -$507 |
|
2466
RadNet
RDNT
$4.84B
| $17K | ﹤0.01% |
+2,142
| New | +$17.9K |
|
2467
PUT
SM Energy
SM
$7.96B
| $17K | ﹤0.01% |
119
-66
| -36% | -$2.87K |
|
2468
Scully Royalty
SRL
$76.7M
| $17K | ﹤0.01% |
880
+499
| +131% | +$11.7K |
|
2469
PUT
Texas Capital Bancshares
TCBI
$4.31B
| $17K | ﹤0.01% |
45
+9
| +25% | +$424 |
|
2470
Talphera
TLPH
$70.1M
| $17K | ﹤0.01% |
+233
| New | +$30.5K |
|
2471
PUT
T. Rowe Price
TROW
$25B
| $17K | ﹤0.01% |
144
+124
| +620% | +$10.2K |
|
2472
CALL
Tyler Technologies
TYL
$12.2B
| $17K | ﹤0.01% |
11
+1
| +10% | +$115 |
|
2473
Valley National Bancorp
VLY
$7.93B
| $17K | ﹤0.01% |
1,843
+1,637
| +795% | +$15.5K |
|
2474
CALL
Vornado Realty Trust
VNO
$7.47B
| $17K | ﹤0.01% |
47
-23
| -33% | -$2.06K |
|
2475
Webster Financial
WBS
$12.3B
| $17K | ﹤0.01% |
475
+453
| +2,059% | +$15.2K |
|
Similar funds
Simplex Trading's Q1 2015 Portfolio in Review
As of Q1 2015, Simplex Trading held 6,670 positions worth $860M, up 4.2% from $826M the previous quarter. Its ten largest holdings account for 15% of the portfolio.
Simplex Trading's Q1 2015 filing shows 1,973 new, 1,386 increased, 1,513 reduced and 1,643 closed positions. Its largest new stake was Alphabet (Google) Class C: 1,497,580 shares worth $41.4M. The largest sale was Apple, an estimated $35.7M.
By sector, the portfolio is most concentrated in Communication Services at 7.8% of assets, up from 4.8% a quarter earlier, followed by Consumer Discretionary and Healthcare.
- Simplex Trading's largest Q1 2015 buy was Alphabet (Google) Class C: 1,497,580 shares worth $41.4M.
- Simplex Trading added most to Alibaba in Q1 2015, an estimated $10.5M increase.
- Simplex Trading's biggest Q1 2015 reduction was Apple, cutting an estimated $35.7M.
- Simplex Trading fully exited Amazon in Q1 2015, selling an estimated $29M.
- Simplex Trading's ten largest holdings make up 15% of its $860M portfolio in Q1 2015.
- Simplex Trading opened 1,973 new positions and closed 1,643 in Q1 2015.
- Simplex Trading's portfolio value rose 4.2% quarter-over-quarter to $860M.
Based on Simplex Trading's 13F filing for Q1 2015, filed 21 Apr 2015.