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
|
+$54.6M |
| 2 |
Apple
AAPL
|
+$29.1M |
| 3 |
Meta Platforms (Facebook)
META
|
+$15.7M |
| 4 |
IBM
IBM
|
+$13.8M |
| 5 |
Baidu
BIDU
|
+$10.6M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$10.1M |
| 2 |
McDonald's
MCD
|
+$8.46M |
| 3 |
Ralph Lauren
RL
|
+$5.36M |
| 4 |
Intel
INTC
|
+$5.04M |
| 5 |
WBA
Walgreens Boots Alliance
WBA
|
+$4.76M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Communication Services | 14.27% |
| 2 | Technology | 10.3% |
| 3 | Healthcare | 7.76% |
| 4 | Consumer Discretionary | 6.32% |
| 5 | Financials | 5.18% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
651
Dorman Products
DORM
$4.03B
| $269K | 0.02% |
+5,647
| New | +$275K |
|
|
UWC
652
CALL
DELISTED
PROSHARES TR ULTRA RUSSELL3000
UWC
| $269K | 0.02% |
654
+107
| +20% | +$44K |
|
|
BLUE
653
CALL
DELISTED
bluebird bio
BLUE
| $268K | 0.02% |
11
+4
| +57% | +$8.15K |
|
654
PUT
Visa
V
$672B
| $268K | 0.02% |
1,616
-1,870
| -54% | -$127K |
|
655
PUT
Intuitive Surgical
ISRG
$122B
| $267K | 0.02% |
1,782
+1,368
| +330% | +$76.5K |
|
656
CALL
Zillow
ZG
$7.17B
| $266K | 0.02% |
2,790
| – | – |
|
657
AstraZeneca
AZN
$263B
| $265K | 0.02% |
+4,164
| New | +$285K |
|
658
PUT
SLB Ltd
SLB
$71.3B
| $265K | 0.02% |
1,173
-1,980
| -63% | -$179K |
|
|
WPZ
659
DELISTED
Williams Partners L.P.
WPZ
| $265K | 0.02% |
5,479
+416
| +8% | +$21.6K |
|
|
AXON
660
CALL
Axon Enterprise
AXON
$39.6B
| $264K | 0.02% |
313
+134
| +75% | +$4.19K |
|
|
YHOO
661
CALL
DELISTED
Yahoo Inc
YHOO
| $264K | 0.02% |
2,133
+1,087
| +104% | +$46.7K |
|
|
GAP
662
The Gap Inc
GAP
$7.07B
| $263K | 0.02% |
6,893
-2,883
| -29% | -$114K |
|
663
PUT
CorMedix
CRMD
$623M
| $262K | 0.02% |
+89
| New | +$3.05K |
|
|
ARII
664
DELISTED
American Railcar Industries, Inc.
ARII
| $262K | 0.02% |
+5,407
| New | +$289K |
|
665
iShares MSCI Emerging Markets ETF
EEM
$28.8B
| $261K | 0.02% |
+6,594
| New | +$276K |
|
|
EJ
666
DELISTED
E HOUSE (CHINA) HOLDINGS LIMITED
EJ
| $261K | 0.02% |
38,882
+36,682
| +1,667% | +$236K |
|
|
KSU
667
DELISTED
Kansas City Southern
KSU
| $260K | 0.02% |
+2,851
| New | +$281K |
|
|
NSM
668
PUT
DELISTED
Nationstar Mortgage Holdings
NSM
| $260K | 0.02% |
166
-25
| -13% | -$542 |
|
|
MFLX
669
DELISTED
MULTI-FINELINE ELECTRONIX INC
MFLX
| $260K | 0.02% |
11,920
+11,739
| +6,486% | +$266K |
|
|
ANSS
670
DELISTED
Ansys
ANSS
| $259K | 0.02% |
2,839
+763
| +37% | +$67.8K |
|
671
CALL
Harley-Davidson
HOG
$2.91B
| $259K | 0.02% |
173
+168
| +3,360% | +$9.61K |
|
672
Novavax
NVAX
$1.3B
| $259K | 0.02% |
1,163
+619
| +114% | +$109K |
|
673
TD Synnex
SNX
$20.2B
| $259K | 0.02% |
7,094
+4,982
| +236% | +$198K |
|
|
CYT
674
DELISTED
CYTEC INDS INC
CYT
| $259K | 0.02% |
4,292
+3,714
| +643% | +$216K |
|
675
CALL
Accenture
ACN
$85.7B
| $258K | 0.02% |
291
-105
| -27% | -$10K |
|
Similar funds
Simplex Trading's Q2 2015 Portfolio in Review
As of Q2 2015, Simplex Trading held 6,639 positions worth $1.19B, up 39% from $860M the previous quarter. Its ten largest holdings account for 20% of the portfolio.
Simplex Trading deployed $279M of net new capital in Q2 2015, opening 1,607 new positions and adding to 1,829 existing holdings. Its largest new stake was IBM: 85,948 shares worth $13.4M.
By sector, the portfolio is most concentrated in Communication Services at 14% of assets, up from 7.8% a quarter earlier, followed by Technology and Healthcare.
On the sell side, the largest reduction was Intel, an estimated $5.04M trimmed.
- Simplex Trading's largest Q2 2015 buy was IBM: 85,948 shares worth $13.4M.
- Simplex Trading added most to Alphabet (Google) Class C in Q2 2015, an estimated $54.6M increase.
- Simplex Trading's biggest Q2 2015 reduction was Intel, cutting an estimated $5.04M.
- Simplex Trading fully exited State Street SPDR S&P 500 ETF Trust in Q2 2015, selling an estimated $10.1M.
- Simplex Trading's ten largest holdings make up 20% of its $1.19B portfolio in Q2 2015.
- Simplex Trading opened 1,607 new positions and closed 1,438 in Q2 2015.
- Simplex Trading's portfolio value rose 39% quarter-over-quarter to $1.19B.
Based on Simplex Trading's 13F filing for Q2 2015, filed 8 Jul 2015.