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 |
Alibaba
BABA
|
+$50.3M |
| 2 |
Boeing
BA
|
+$24.3M |
| 3 |
SPDR Gold Trust
GLD
|
+$18.3M |
| 4 |
Biogen
BIIB
|
+$15.9M |
| 5 |
FedEx
FDX
|
+$15.1M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Alphabet (Google) Class C
GOOG
|
+$60.3M |
| 2 |
iShares Russell 2000 ETF
IWM
|
+$36.4M |
| 3 |
Netflix
NFLX
|
+$19M |
| 4 |
State Street Industrial Select Sector SPDR ETF
XLI
|
+$17.3M |
| 5 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$14.2M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Consumer Discretionary | 0.49% |
| 2 | Technology | 0.48% |
| 3 | Healthcare | 0.35% |
| 4 | Industrials | 0.35% |
| 5 | Communication Services | 0.21% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
1
PUT
State Street SPDR S&P 500 ETF Trust
SPY
$787B
| $2.82B | 8.02% |
94,979
-25,541
| -21% | -$7.55M |
|
|
2
CALL
State Street SPDR S&P 500 ETF Trust
SPY
$787B
| $2.22B | 6.32% |
74,821
-17,118
| -19% | -$5.06M |
|
3
PUT
iShares S&P 100 ETF
OEF
$20.2B
| $1.26B | 3.59% |
125,595
+14,281
| +13% | +$1.87M |
|
4
CALL
Amazon
AMZN
$2.66T
| $1.13B | 3.22% |
130,420
+28,760
| +28% | +$2.67M |
|
|
5
PUT
Amazon
AMZN
$2.66T
| $939M | 2.67% |
108,140
-5,660
| -5% | -$525K |
|
|
6
CALL
iShares S&P 100 ETF
OEF
$20.2B
| $782M | 2.22% |
80,873
-2,805
| -3% | -$367K |
|
7
PUT
Invesco QQQ Trust
QQQ
$471B
| $755M | 2.15% |
39,966
-4,084
| -9% | -$774K |
|
8
PUT
Tesla
TSLA
$1.42T
| $692M | 1.97% |
431,205
-57,840
| -12% | -$906K |
|
9
PUT
Apple
AAPL
$4.81T
| $445M | 1.27% |
79,448
+3,600
| +5% | +$188K |
|
|
10
CALL
Alphabet (Google) Class A
GOOGL
$4.24T
| $441M | 1.25% |
72,240
-1,760
| -2% | -$104K |
|
|
11
PUT
Alphabet (Google) Class A
GOOGL
$4.24T
| $419M | 1.19% |
68,640
-28,620
| -29% | -$1.69M |
|
|
12
CALL
Apple
AAPL
$4.81T
| $397M | 1.13% |
70,816
-12,556
| -15% | -$656K |
|
|
13
CALL
Invesco QQQ Trust
QQQ
$471B
| $379M | 1.08% |
20,050
-6,715
| -25% | -$1.27M |
|
|
14
CALL
SPDR Gold Trust
GLD
$132B
| $345M | 0.98% |
24,854
+2,840
| +13% | +$395K |
|
|
15
CALL
Netflix
NFLX
$286B
| $337M | 0.96% |
125,750
+57,890
| +85% | +$1.81M |
|
16
CALL
Meta Platforms (Facebook)
META
$1.63T
| $331M | 0.94% |
18,614
-13,346
| -42% | -$2.54M |
|
17
PUT
State Street Materials Select Sector SPDR ETF
XLB
$8.31B
| $329M | 0.93% |
102,626
+984
| +1% | +$28.4K |
|
18
PUT
Chipotle Mexican Grill
CMG
$42.7B
| $318M | 0.91% |
189,350
-71,750
| -27% | -$1.14M |
|
|
19
PUT
Netflix
NFLX
$286B
| $308M | 0.88% |
115,220
+36,180
| +46% | +$1.13M |
|
|
20
CALL
State Street Materials Select Sector SPDR ETF
XLB
$8.31B
| $292M | 0.83% |
91,954
+17,954
| +24% | +$518K |
|
|
21
CALL
Alibaba
BABA
$283B
| $270M | 0.77% |
16,164
-13,380
| -45% | -$2.3M |
|
22
PUT
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
$46B
| $241M | 0.69% |
8,950
+1,416
| +19% | +$378K |
|
|
23
PUT
Boeing
BA
$161B
| $215M | 0.61% |
5,657
+153
| +3% | +$54.7K |
|
|
24
PUT
SPDR Gold Trust
GLD
$132B
| $210M | 0.6% |
15,154
-4,536
| -23% | -$631K |
|
|
25
CALL
Tesla
TSLA
$1.42T
| $210M | 0.6% |
130,815
-95,070
| -42% | -$1.49M |
|
Similar funds
Simplex Trading's Q3 2019 Portfolio in Review
As of Q3 2019, Simplex Trading held 8,410 positions worth $35.2B, down 4.1% from $36.6B the previous quarter. Its ten largest holdings account for 33% of the portfolio.
Simplex Trading's Q3 2019 filing shows 1,312 new, 3,129 increased, 2,596 reduced and 1,163 closed positions. Its largest new stake was SPDR Gold Trust: 131,281 shares worth $18.2M. The largest sale was Alphabet (Google) Class C, an estimated $60.3M.
By sector, the portfolio is most concentrated in Consumer Discretionary at 0.49% of assets, up from 0.26% a quarter earlier, followed by Technology and Healthcare.
- Simplex Trading's largest Q3 2019 buy was SPDR Gold Trust: 131,281 shares worth $18.2M.
- Simplex Trading added most to Alibaba in Q3 2019, an estimated $50.3M increase.
- Simplex Trading's biggest Q3 2019 reduction was Alphabet (Google) Class C, cutting an estimated $60.3M.
- Simplex Trading fully exited iShares Russell 2000 ETF in Q3 2019, selling an estimated $36.4M.
- Simplex Trading's ten largest holdings make up 33% of its $35.2B portfolio in Q3 2019.
- Simplex Trading opened 1,312 new positions and closed 1,163 in Q3 2019.
- Simplex Trading's portfolio value fell 4.1% quarter-over-quarter to $35.2B.
Based on Simplex Trading's 13F filing for Q3 2019, filed 15 Oct 2019.