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 | |
|---|---|---|---|---|---|---|
401
CALL
Pfizer
PFE
$141B
| $394K | 0.05% |
951
+527
| +124% | +$16.8K |
|
402
CALL
Target
TGT
$62.6B
| $393K | 0.05% |
971
+673
| +226% | +$52K |
|
|
NVO
403
Novo Nordisk
NVO
$213B
| $392K | 0.05% |
+14,712
| New | +$339K |
|
404
VanEck Semiconductor ETF
SMH
$70.7B
| $392K | 0.05% |
+14,200
| New | +$392K |
|
405
Citizens Financial Group
CFG
$30.6B
| $390K | 0.05% |
+16,167
| New | +$396K |
|
406
CALL
Goldman Sachs
GS
$324B
| $389K | 0.05% |
802
-59
| -7% | -$11K |
|
407
PUT
UnitedHealth
UNH
$392B
| $389K | 0.05% |
882
+730
| +480% | +$81.1K |
|
408
Madison Square Garden
MSGS
$9.56B
| $388K | 0.05% |
+6,438
| New | +$354K |
|
|
MNDT
409
PUT
DELISTED
Mandiant, Inc. Common Stock
MNDT
| $388K | 0.05% |
1,992
+1,357
| +214% | +$52.4K |
|
410
Alaska Air
ALK
$4.94B
| $387K | 0.05% |
+5,860
| New | +$380K |
|
411
CALL
Acadia Pharmaceuticals
ACAD
$4.27B
| $386K | 0.04% |
+563
| New | +$19.4K |
|
412
CALL
Mastercard
MA
$470B
| $385K | 0.04% |
755
-1,068
| -59% | -$92.6K |
|
413
CALL
State Street SPDR S&P MIDCAP 400 ETF Trust
MDY
$27B
| $385K | 0.04% |
+335
| New | +$90.3K |
|
414
CALL
SPDR Gold Trust
GLD
$133B
| $384K | 0.04% |
+1,854
| New | +$217K |
|
415
CALL
Cigna
CI
$75.4B
| $383K | 0.04% |
136
+63
| +86% | +$7.32K |
|
|
OA
416
DELISTED
Orbital ATK, Inc.
OA
| $383K | 0.04% |
5,000
+1,642
| +49% | +$155K |
|
|
UFS
417
DELISTED
DOMTAR CORPORATION (New)
UFS
| $383K | 0.04% |
+8,293
| New | +$349K |
|
418
Honeywell
HON
$73.8B
| $382K | 0.04% |
+4,079
| New | +$373K |
|
419
Synaptics
SYNA
$4.71B
| $380K | 0.04% |
4,679
-1,077
| -19% | -$81.3K |
|
420
Marvell Technology
MRVL
$189B
| $378K | 0.04% |
25,751
+21,187
| +464% | +$335K |
|
|
SONC
421
DELISTED
Sonic Corp
SONC
| $378K | 0.04% |
11,947
+11,885
| +19,169% | +$378K |
|
422
CALL
iShares MSCI Australia ETF
EWA
$1.35B
| $377K | 0.04% |
3,611
-1,133
| -24% | -$25.9K |
|
|
ATCO
423
DELISTED
Atlas Corp.
ATCO
| $377K | 0.04% |
20,709
+2,953
| +17% | +$54K |
|
424
Buckle
BKE
$2.23B
| $376K | 0.04% |
+7,368
| New | +$371K |
|
425
Sprouts Farmers Market
SFM
$6.95B
| $374K | 0.04% |
10,628
+6,409
| +152% | +$227K |
|
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.