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 | |
|---|---|---|---|---|---|---|
476
Incyte
INCY
$23.1B
| $334K | 0.04% |
3,651
+1,282
| +54% | +$106K |
|
|
MNK
477
CALL
DELISTED
MALLINCKRODT PUBLIC LIMITED COMPANY
MNK
| $334K | 0.04% |
+138
| New | +$15.8K |
|
478
Ciena
CIEN
$56.2B
| $333K | 0.04% |
17,250
+10,336
| +149% | +$206K |
|
|
GFIG
479
DELISTED
GFI GROUP INC
GFIG
| $333K | 0.04% |
56,215
+53,461
| +1,941% | +$313K |
|
480
PUT
Chord Energy
CHRD
$7.74B
| $332K | 0.04% |
355
+48
| +16% | +$705 |
|
481
CALL
Viatris
VTRS
$19.8B
| $332K | 0.04% |
659
+365
| +124% | +$20.8K |
|
|
ATML
482
DELISTED
ATMEL CORP
ATML
| $331K | 0.04% |
40,300
+1,044
| +3% | +$8.77K |
|
483
PUT
ProShares UltraShort Industrials
SIJ
$5.96M
| $329K | 0.04% |
42
+40
| +2,000% | +$26.9K |
|
484
NCR Voyix
VYX
$1.07B
| $328K | 0.04% |
18,160
-6,802
| -27% | -$118K |
|
|
ASPX
485
DELISTED
AUSPEX PHARMACEUTICALS INC COM STK (DE)
ASPX
| $328K | 0.04% |
+3,272
| New | +$218K |
|
486
PUT
Chevron
CVX
$384B
| $327K | 0.04% |
1,833
+475
| +35% | +$50.7K |
|
|
GWPH
487
DELISTED
GW Pharmaceuticals Plc American Depositary Shares
GWPH
| $327K | 0.04% |
+3,589
| New | +$291K |
|
|
AET
488
CALL
DELISTED
Aetna Inc
AET
| $327K | 0.04% |
199
+120
| +152% | +$11.8K |
|
|
DO
489
PUT
DELISTED
Diamond Offshore Drilling
DO
| $326K | 0.04% |
270
-846
| -76% | -$26.4K |
|
490
DaVita
DVA
$14.9B
| $325K | 0.04% |
4,002
+1,396
| +54% | +$107K |
|
491
Devon Energy
DVN
$51.8B
| $325K | 0.04% |
5,403
-51,477
| -91% | -$3.14M |
|
492
Targa Resources
TRGP
$61.1B
| $325K | 0.04% |
+3,400
| New | +$319K |
|
493
CALL
McDonald's
MCD
$187B
| $324K | 0.04% |
1,740
+785
| +82% | +$74.5K |
|
494
Cheniere Energy
LNG
$56B
| $322K | 0.04% |
4,165
-29,278
| -88% | -$2.18M |
|
|
RYL
495
CALL
DELISTED
RYLAND GROUP INC
RYL
| $322K | 0.04% |
371
+304
| +454% | +$13K |
|
496
Antero Resources
AR
$10.9B
| $321K | 0.04% |
9,110
-961
| -10% | -$36.1K |
|
497
Dover
DOV
$28.9B
| $320K | 0.04% |
5,742
+2,120
| +59% | +$122K |
|
498
PUT
eBay
EBAY
$49.3B
| $320K | 0.04% |
4,225
+126
| +3% | +$3K |
|
499
HF Sinclair
DINO
$16.4B
| $319K | 0.04% |
7,937
-3,509
| -31% | -$135K |
|
500
RH
RH
$3.31B
| $319K | 0.04% |
3,223
-3,033
| -48% | -$275K |
|
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.