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 | |
|---|---|---|---|---|---|---|
551
CALL
CME Group
CME
$90.1B
| $285K | 0.03% |
561
+401
| +251% | +$37.1K |
|
|
CTRA
552
DELISTED
Coterra Energy
CTRA
| $284K | 0.03% |
9,625
-7,236
| -43% | -$205K |
|
553
Ford
F
$57.5B
| $283K | 0.03% |
+17,547
| New | +$277K |
|
554
CALL
lululemon athletica
LULU
$12.9B
| $282K | 0.03% |
477
-793
| -62% | -$50.8K |
|
|
EMES
555
DELISTED
Emerge Energy Services LP
EMES
| $282K | 0.03% |
+5,948
| New | +$312K |
|
556
iShares US Transportation ETF
IYT
$2.33B
| $280K | 0.03% |
+7,176
| New | +$288K |
|
557
Papa John's
PZZA
$1.05B
| $280K | 0.03% |
+4,540
| New | +$283K |
|
558
CALL
Wells Fargo
WFC
$262B
| $279K | 0.03% |
731
-519
| -42% | -$28K |
|
|
BWLD
559
CALL
DELISTED
Buffalo Wild Wings, Inc.
BWLD
| $278K | 0.03% |
72
-72
| -50% | -$13.4K |
|
|
DWRE
560
DELISTED
DEMANDWARE INC COM STK (DE)
DWRE
| $278K | 0.03% |
+4,579
| New | +$266K |
|
561
Danaher
DHR
$127B
| $277K | 0.03% |
4,855
-3,115
| -39% | -$179K |
|
562
iShares Europe ETF
IEV
$1.64B
| $277K | 0.03% |
6,272
+5,641
| +894% | +$247K |
|
563
Medtronic
MDT
$105B
| $277K | 0.03% |
3,558
-12,842
| -78% | -$973K |
|
|
ASNA
564
DELISTED
Ascena Retail Group, Inc.
ASNA
| $277K | 0.03% |
+957
| New | +$243K |
|
|
EPE
565
DELISTED
EP Energy Corporation
EPE
| $277K | 0.03% |
+26,456
| New | +$279K |
|
566
CALL
Macy's
M
$6.4B
| $276K | 0.03% |
380
-52
| -12% | -$3.35K |
|
567
Liberty Global Class A
LBTYA
$3.52B
| $275K | 0.03% |
6,499
+4,074
| +168% | +$170K |
|
568
ProShares Ultra Financials
UYG
$803M
| $275K | 0.03% |
+11,394
| New | +$274K |
|
|
VMW
569
PUT
DELISTED
VMware, Inc
VMW
| $275K | 0.03% |
263
-256
| -49% | -$20.9K |
|
570
CALL
Ionis Pharmaceuticals
IONS
$8.93B
| $273K | 0.03% |
397
-295
| -43% | -$20K |
|
|
GG
571
DELISTED
Goldcorp Inc
GG
| $273K | 0.03% |
15,068
+9,266
| +160% | +$197K |
|
572
State Street SPDR S&P China ETF
GXC
$447M
| $272K | 0.03% |
3,216
+3,181
| +9,089% | +$258K |
|
|
CBM
573
DELISTED
Cambrex Corporation
CBM
| $272K | 0.03% |
+6,887
| New | +$204K |
|
|
ANDV
574
CALL
DELISTED
Andeavor
ANDV
| $272K | 0.03% |
443
-79
| -15% | -$6.63K |
|
|
CY
575
DELISTED
Cypress Semiconductor
CY
| $272K | 0.03% |
+19,332
| New | +$286K |
|
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.